Carrier 25hba Installation Instructions Manual - User Manual

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Installation Instructions

25HBA

BASE

SERIES PURON

REFRIGERANT HEAT PUMPS

SIZES 018 TO 060

1 1/2 TO 5 NOMINAL TONS

05341

Fig. 1 -- 25HBA Standard Grille Unit

NOTE

:Read the entire instruction manual before starting the

installation.

TABLE OF CONTENTS

Page

Safety Considerations

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation Recommendations

. . . . . . . . . . . . . . . . . . . . . . . .

Installation

3 -- 12

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 1 -- Check Equipment & Jobsite

. . . . . . . . . . . . . . .

Step 2 -- Install on Solid Pad

. . . . . . . . . . . . . . . . . . . . . .

Step 3 -- Clearance Requirements

. . . . . . . . . . . . . . . . . .

Step 4 -- Operating Ambient

. . . . . . . . . . . . . . . . . . . . . .

Step 5 -- Elevate Unit

. . . . . . . . . . . . . . . . . . . . . . . . . . .

Step 6 -- Install TXV

3 -- 4

. . . . . . . . . . . . . . . . . . . . . . . . .

Step 7 -- Check Defrost Thermostat

. . . . . . . . . . . . . . . . .

Step 8 -- Make Piping Connections

5 -- 8

. . . . . . . . . . . . . .

Step 9 -- Make Electrical Connections

8 -- 9

. . . . . . . . . . . .

Step 10 -- Compressor Crankcase Heater

. . . . . . . . . . . . .

Step 11 -- Install Electrical Accessories

. . . . . . . . . . . . . .

Step 12 -- Start--Up

9 -- 11

. . . . . . . . . . . . . . . . . . . . . . . . . .

Step 13 -- Check Charge

. . . . . . . . . . . . . . . . . . . . . . . . .

Step 14 -- Final Checks

. . . . . . . . . . . . . . . . . . . . . . . . . .

Care and Maintenance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,

maintenance, or use can cause explosion, fire, electrical shock, or
other conditions which may cause death, personal injury, or

property damage. Consult a qualified installer, service agency, or
your distributor or branch for information or assistance. The

qualified installer or agency must use factory--authorized kits or

accessories when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.

Have fire extinguisher available. Read these instructions

thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes

and National Electrical Code (NEC) for special requirements.

Recognize safety information. This is the safety--alert symbol

When you see this symbol on the unit and in instructions or

manuals, be alert to the potential for personal injury.
Understand these signal words; DANGER, WARNING, and

CAUTION. These words are used with the safety--alert symbol.

DANGER identifies the most serious hazards which

will

result in

severe personal injury or death.
WARNING signifies hazards which

could

result in personal

injury or death. CAUTION is used to identify unsafe practices

which

may

result in minor personal injury or product and

property damage. NOTE is used to highlight suggestions which

will

result in enhanced installation, reliability, or operation.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.
Before installing, modifying, or servicing system, main

electrical disconnect switch must be in the OFF position.

There may be more than 1 disconnect switch. Lock out

and tag switch with a suitable warning label.

INSTALLATION RECOMMENDATIONS

NOTE

: In some cases noise in the living area has been traced to

gas pulsations from improper installation of equipment.

1. Locate unit away from windows, patios, decks, etc. where unit
operation sound may disturb customer.
2. Ensure that vapor and liquid tube diameters are appropriate for

unit capacity.
3. Run refrigerant tubes as directly as possible by avoiding

unnecessary turns and bends.
4. Leave some slack between structure and unit to absorb

vibration.
5. When passing refrigerant tubes through the wall, seal opening

with RTV or other pliable silicon--based caulk. (See Fig. 2.)
6. Avoid direct tubing contact with water pipes, duct work, floor
joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs with a
rigid wire or strap which comes in direct contact with tubing. (See

Fig. 2.)
8. Ensure that tubing insulation is pliable and completely
surrounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 2.)
10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.

INSULATION

VAPOR TUBE

LIQUID TUBE

OUTDOOR WALL

INDOOR WALL

LIQUID TUBE

VAPOR TUBE

INSULATION

CAULK

Avoid contact between tubing and structure

NOTE:

THROUGH THE WALL

HANGER STRAP

(AROUND VAPOR

TUBE ONLY)

JOIST

″

MIN.

SUSPENSION

A94028

Fig. 2 -- Connecting Tubing Installation

When outdoor unit is connected to factory--approved indoor unit,

outdoor unit contains system refrigerant charge for operation with

ARI rated indoor unit when connected by 15 ft of field--supplied
or factory accessory tubing. For proper unit operation, check

refrigerant charge using charging information located on control
box cover and/or in the Check Charge section of this instruction.

IMPORTANT

:Maximum liquid--line size is 3/8--in. OD for all

residential applications including line line.

IMPORTANT

: Always install the factory--supplied liquid--line

filter drier. If replacing the filter drier, refer to Product Data Digest
for appropriate part number. Obtain replacement filter driers from
your distributor or branch.

25H

INSTALLATION

Step 1.—Check Equipment and Job Site

UNPACK UNIT

Move to final location. Remove carton taking care not to damage
unit.

INSPECT EQUIPMENT

File claim with shipping company prior to installation if shipment

is damaged or incomplete. Locate unit rating plate on unit corner
panel. It contains information needed to properly install unit.

Check rating plate to be sure unit matches job specifications.

Step 2.—Install on a Solid, Level Mounting Pad

If conditions or local codes require the unit be attached to pad, tie

down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig.

3 to determine base pan size and knockout hole location.
For hurricane tie downs, contact distributor for details and PE

Certification (Professional Engineer), if required.
On rooftop applications, mount on level platform or frame. Place

unit above a load--bearing wall and isolate unit and tubing set

from structure. Arrange supporting members to adequately
support unit and minimize transmission of vibration to building.

Consult local codes governing rooftop applications.
Roof mounted units exposed to winds above 5 mph may require

wind baffles. Consult the Service Manual -- Residential Split

System Air Conditioners and Heat Pumps for wind baffle
construction.

NOTE

: Unit must be level to within

(

3/8 in./ft) per

compressor manufacturer specifications.

Step 3.—Clearance Requirements

When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30--in. clearance to

service end of unit and 48 in. above unit. For proper airflow, a

6--in. clearance on 1 side of unit and 12 in. on all remaining sides
must be maintained. Maintain a distance of 24 in. between units.

Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.

3/8---in. Dia. Tiedown

Knockouts in Basepan

(2) Places

View From Top

UNIT BASE PAN

DIMENSIONS

TIEDOWN KNOCKOUT LOCATIONS

26 X 26

9–1/8

4–7/16

21–1/4

31–1/2 X 31–1/2

9–1/8

6–9/16

24–11/16

35 X 35

9–1/8

6–9/16

28–7/16

A05177

Fig. 3 -- Tiedown Knockout Requirements

On rooftop applications, locate unit at least 6 in. above roof
surface.

Step 4.—Operating Ambient

The minimum outdoor operating ambient in cooling mode is

F, and the maximum outdoor operating ambient in cooling

mode is 125

F. The maximum outdoor operating ambient in

heating mode is 66

Step 5.—Elevate Unit

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.
To avoid improper performance and possible

equipment failure, unit must be kept free of an

accumulation of water and/or ice in the basepan.

Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate

drainage of unit. If using accessory support feet, use installation
instructions from kit for installation.

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.
To prevent damage to the unit, ensure that it is located

with the supports such that the unit is stable in all

circumstances including adverse conditions.

Step 6.—Install TXV

NOTE

: Applies to

non--TXV

indoor units only. If installing a

rated and approved indoor coil without a factory installed
Puron

TXV, remove and replace the fixed orifice or R--22

TXV expansion device with a hard shutoff Puron TXV.

The thermostatic expansion valve is specifically designed to

operate with Puron Refrigerant. Do not use an R--22 TXV. An
existing R--22 TXV must be replaced with a factory approved

TXV specifically designed for Puron Refrigerant. Refer to
Product Data Digest for the appropriate TXV kit number.

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.
To avoid improper performance and possible equipment

failure, all indoor coil units must be installed with a hard

shutoff Puron TXV metering device.

IMPORTANT

: If not factory installed, the TXV should be

mounted as close to the indoor coil as possible and in a vertical,
upright position. Avoid mounting the inlet tube vertically down.

25H

Valve is more susceptible to malfunction due to debris if inlet tube
is facing down. A factory--approved filter drier must be installed in
the liquid line.

INSTALLING TXV IN PLACE OF PISTON

1. Pump system down to 2 psig and recover refrigerant.
2. Remove hex nut from piston body. Use backup wrench on fan
coils.
3. Remove and discard factory--installed piston. Be sure Teflon

seal is in place.
4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.

NOTE

:If the piston is not removed from the body, TXV will not

function properly.

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.
To prevent damage to the unit, use a brazing shield and

wrap TXV with wet cloth or use heat sink material.

5. Install TXV on indoor coil liquid line. Sweat swivel adapter to

inlet of indoor coil and attach to TXV outlet. Use backup wrench
to avoid damage to tubing or valve. Sweat inlet of TXV, marked

“IN” to liquid line. Avoid excessive heat which could damage
valve.
6. Install vapor elbow with equalizer adapter to suction tube

of line set and suction connection to indoor coil. Adapter has a
1/4--in. male connector for attaching equalizer tube.
7. Connect equalizer tube of TXV to 1/4--in. equalizer fitting on
vapor line adapter.
8. Attach TXV bulb to horizontal section of suction line using
clamps provided. Insulate bulb with field--supplied insulation

tape. See Fig. 4 for correct positioning of sensing bulb.
9. Proceed with remainder of unit installation.

2 O'CLOCK

10 O'CLOCK

SENSING BULB

STRAP

SUCTION TUBE

8 O'CLOCK

4 O'CLOCK

⁄

IN. OD & SMALLER

LARGER THAN

⁄

IN. OD

A81032

Fig. 4 -- Position of Sensing Bulb

REPLACING TXV ON R--22 INDOOR COIL

1. Pump system down to 2 psig and recover refrigerant.
2. Remove coil access panel and fitting panel from front of
cabinet.
3. Remove TXV support clamp using a 5/16--in. nut driver. Save
the clamp.
4. Remove R--22 TXV using a backup wrench on flare

connections to prevent damage to tubing.
5. Using wire cutters, cut equalizer tube off flush with vapor tube

inside cabinet.
6. Remove bulb from vapor tube inside cabinet.
7. Braze equalizer stub--tube closed. Use protective barrier as

necessary to prevent damage to drain pan.

IMPORTANT

: Route the equalizer tube of Puron TXV through

suction line connection opening in fitting panel prior to replacing
fitting panel around tubing.

8. Install TXV with 3/8--in. copper tubing through small hole in

service panel. Use wrench and backup wrench, to avoid damage
to tubing or valve, to attach TXV to distributor.
9. Reinstall TXV support clamp (removed in item 3).
10. Attach TXV bulb to vapor tube inside cabinet, in same

location as original was when removed, using supplied bulb

clamps (nylon or copper). See Fig. 4 for correct positioning of
sensing bulb.
11. Route equalizer tube through suction connection opening
(large hole) in fitting panel and install fitting panel in place.
12. Sweat inlet of TXV, marked IN to liquid line. Avoid

excessive heat which could damage valve.
13. Install vapor elbow with equalizer adapter to vapor line of

line set and vapor connection to indoor coil. Adapter has

1/4--in. male connector for attaching equalizer tube.
14. Connect equalizer tube of TXV to 1/4--in. equalizer fitting on

vapor line adapter. Use backup wrench to prevent damage to
equalizer fitting.
15. Proceed with remainder of unit installation.

A05226

Fig. 5 -- Liquid Service Valve with Sweat Adapter Tube

25H

Step 7.—Check Defrost Thermostat

Check defrost thermostat to ensure it is properly located and
securely attached. There is a liquid header with a brass distributor

and feeder tube going into outdoor coil. At the end of the one of
the feeder tubes, there is a 3/8 in. O.D. stub tube approximately 2

in. long. (See Fig. 6.) The defrost thermostat should be located on

stub tube. Note that there is only one stub tube used with liquid
header, and on most units it is the bottom circuit.

FEEDER TUBE

DEFROST

THERMOSTAT

STUB TUBE

A97517

Fig. 6 -- Defrost Thermostat Location

Step 8.—Make Piping Connections

WARNING

PERSONAL INJURY AND UNIT DAMAGE

HAZARD

Failure to follow this warning could result in personal

injury or death.
Relieve pressure and recover all refrigerant before

system repair or final unit disposal to avoid personal

injury or death. Use all service ports and open all

flow--control devices, including solenoid valves.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage

or improper operation.
If ANY refrigerant tubing is buried, provide a 6--in. vertical

rise at service valve. Refrigerant tubing lengths up to 36--in.

may be buried without further special consideration. Do not

bury lines longer than 36 in.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.
To prevent damage to unit or service valves, observe the

following:

Use a brazing shield

Wrap service valves with wet cloth or use a heat sink

material.

Outdoor units may be connected to indoor section using

accessory tubing package or field--supplied refrigerant grade
tubing of correct size and condition. For tubing requirements

beyond 80 ft., substantial capacity and performance losses can

occur. Following the recommendations in the Long Line
Guideline for Split--System Air Conditioners and Heat Pumps

will reduce these losses. Refer to Table 1 for accessory
requirements. Refer to Table 2 for field tubing diameters.
If refrigerant tubes or indoor coil are exposed to atmosphere, they

must be evacuated to 500 microns to eliminate contamination and
moisture in the system.

25H

Table 1—Accessory Usage

Accessory

REQUIRED FOR LOW---AMBI-

ENT APPLICATIONS

(Below 55

)

REQUIRED FOR LONG LINE

APPLICATIONS* (Over 80 Ft)

REQUIRED FOR SEA

COAST APPLICATIONS

(Within 2 miles)

Crankcase Heater

Yes

Evaporator Freeze Thermostat

Yes

Winter Start Control

Yes

Accumulator

Compressor Start Assist Capacitor

and Relay

Yes

Motor Master

Control

Yes

{

Support Feet

Recommended

Liquid Line Solenoid Valve

Yes

See Long---Line Application

Guideline

Ball Bearing Fan Motor

Yes

}

* For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft Total Equivalent Length), refer to the Long Line Guidelines for
Air Conditioners and Heat Pumps using R---22.

{

Required for low---ambient controller (full modulation feature) and Motor Master



control only.

Table 2—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)

UNIT SIZE

LIQUID

VAPOR (up to 80 ft)

Connection Diameter

Tube Diameter

Connection Diameter

Rated Tube Diameter

018, 024

3/8

5/8

030, 036

3/8

3/4

042, 048

3/8

7/8

060

3/8

7/8

1--1/8

Notes:
1. Tube diameters are for total equivalent lengths up to 80 ft..

2. Do not apply capillary tube or fixed orifice indoor coils to these units.
* For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft.Total Equivalent Length), refer to the Longline

Guideline--- Air Conditioners and Heat Pumps using R---22

25H

OUTDOOR UNIT CONNECTED TO FACTORY APPROVED
INDOOR UNIT

These outdoor units are carefully evaluated and listed with

specific indoor coils for proper system performance.

IMPORTANT

: Do not apply indoor coils which are not factory

approved to these units.

INSTALL ADAPTER TUBE

1. Remove plastic retainer holding outdoor piston in liquid
service valve.
2. Check outdoor piston size with matching number listed on unit
rating plate.
3. Locate plastic bag taped to unit containing adapter tube.
4. Remove Teflon



washer from bag and install on open end of

liquid service valve. (See Fig. 5.)
5. Remove adapter tube from bag and connect threaded nut to
liquid service valve. Tighten nut finger--tight and then with

wrence an additional 1/2 turn (15 ft--lb). DO NOT OVER
TIGHTEN!

REFRIGERANT TUBING AND SWEAT CONNECTIONS

Connect vapor tube to fitting on outdoor unit vapor service

valves (see Table 2). Connect liquid tubing to adapter tube on

liquid
service valve. Use refrigerant grade tubing.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.
To avoid valve damage while brazing, service valves

must be wrapped in a heat--sinking material such as a wet

cloth.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage

or improper operation.
To avoid performance loss and compressor failure, installation

of filter drier in liquid line is required.

INSTALL LIQUID LINE FILTER DRIER INDOOR

Refer to Fig. 7 and install filter drier as follows:
1. Braze 5 in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to 5 in. long liquid tube from step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.

A05227

Fig. 7 -- Liquid Line Filter Drier

LEAK TESTING

Leak test all joints indoors, outdoors, and refrigerant tubing.

EVACUATE REFRIGERANT TUBING AND INDOOR COIL

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.
To avoid compressor damage never use the system

compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the

recommended the recommended deep vacuum method of 500
microns. The alternate triple evacuation method may be used if

the procedure outlined below is followed.

IMPORTANT

: Always break a vacuum with dry nitrogen.

25H

DEEP VACUUM METHOD

The deep vacuum method requires a vacuum pump capable of

pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum

method is the most positive way of assuring a system is free of air
and liquid water. See Fig. 8.

500

MINUTES

1000

1500

LEAK IN
SYSTEM

VACUUM TIGHT
TOO WET

TIGHT
DRY SYSTEM

2000

MICRONS

2500

3000

3500

4000

4500

5000

A95424

Fig. 8 --

Deep Vacuum Graph

CHECK FOR TIGHT, DRY SYSTEM

(IF IT HOLDS DEEP VACUUM)

EVACUATE

BREAK VACUUM WITH DRY NITROGEN

WAIT

EVACUATE

CHARGE SYSTEM

BREAK VACUUM WITH DRY NITROGEN

EVACUATE

WAIT

A95425

Fig. 9 --

Triple Evacuation Method

TRIPLE EVACUATION METHOD

The triple evacuation method should only be used when vacuum

pump is only capable of pumping down to 28 in. of mercury
vacuum, and system does not contain any liquid water. Refer to

Fig. 9 and proceed as follows:
1. Pump system down to 28 in. of mercury and allow pump to

continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and open

until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hour.

During this time, dry nitrogen will be able to diffuse throughout
the system absorbing moisture.
5. Repeat this procedure as indicated by Fig. 9. System will then

be free of any contaminants and water vapor.

FINAL TUBING CHECK

IMPORTANT

: Check to be certain factory tubing on both indoor

and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, makings sure wire ties on feeder tubes are
secure and tight.

Step 9.—Make Electrical Connections

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.
To avoid personal injury or death, do not supply power to

unit with compressor terminal box cover removed.

Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown

on unit rating plate. Contact local power company for correction
of improper voltage. See unit rating plate for recommended

circuit protection device.

NOTE

: Operation of unit on improper line voltage constitutes

abuse and could affect unit reliability. See unit rating plate. Do
not install system where voltage may fluctuate above or below
permissible limits.

NOTE

: Use copper wire only between disconnect switch and

unit.

NOTE

: Install branch circuit disconnect of adequate size per

NEC to handle unit starting current. Locate disconnect within
sight from and readily accessible from unit, per Section 440--14
of NEC.

ROUTE GROUND AND POWER WIRES

Remove access panel to gain access to unit wiring. Extend wires

from disconnect through power wiring hole provided and into
unit control box.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.
The unit cabinet must have an uninterrupted or unbroken

ground to minimize personal injury if an electrical fault

should occur. The ground may consist of electrical wire or

metal conduit when installed in accordance with existing

electrical codes. Failure to follow this warning can result in an

electric shock, fire, or death.

25H

CONNECT GROUND AND POWER WIRES

Connect ground wire to ground connection in control box for

safety. Connect power wiring to contactor as shown in Fig. 10.

DISCONNECT

PER N. E. C. AND/OR

LOCAL CODES

CONTACTOR

GROUND

LUG

FIELD GROUND

WIRING

FIELD POWER

WIRING

A91056

Fig. 10 -- Line Connections

CONNECT CONTROL WIRING

Route 24v control wires through control wiring grommet and
connect leads to control wiring. See Thermostat Installation

Instructions for wiring specific unit combinations. (See Fig. 11.)
Use No. 18 AWG color--coded, insulated (35

C minimum) wire.

If thermostat is located more than 100 ft from unit, as measured

along the control voltage wires, use No. 16 AWG color--coded
wire to avoid excessive voltage drop.
All wiring must be NEC Class 1 and must be separated from

incoming power leads.
Use furnace transformer, fan coil transformer, or accessory

transformer for control power, 24v/40va minimum.

NOTE

: Use of available 24v accessories may exceed the

minimum 40va power requirement. Determine total transformer
loading and increase the transformer capacity or split the load
with an accessory transformer as required.

FINAL WIRING CHECK

IMPORTANT

: Check factory wiring and field wire connections

to ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.

Step 10.—Compressor Crankcase Heater

When equipped with a crankcase heater, furnish power to heater a

minimum of 24 hr before starting unit. To furnish power to heater

only, set thermostat to OFF and close electrical disconnect to
outdoor unit.
A crankcase heater is required if refrigerant tubing is longer than
80 ft. Refer to the Long Line Guideline--Residential Split--System

Air Conditioners and Heat Pumps.

Step 11.—Install Electrical Accessories

Refer to the individual installation instructions packaged with kits
or accessories when installing.

Step 12.—Start--Up

CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in minor personal injury,

equipment damage or improper operation.
To prevent compressor damage or personal injury,

observe the following:

Do not overcharge system with refrigerant.

Do not operate unit in a vacuum or at negative pressure.

Do not disable low pressure switch in scroll compressor

applications.

Dome temperatures may be hot.

CAUTION

PERSONAL INJURY HAZARD

Failure to follow this caution may result in personal

injury.
To prevent personal injury wear safety glasses, protective

clothing, and gloves when handling refrigerant and observe the

following:

Back seating service valves are not equipped with Schrader

valves. Fully back seat (counter clockwise) valve stem
before removing gage port cap.

Front seating service valves are equipped with Schrader

valves.

CAUTION

ENVIRONMENTAL HAZARD

Failure to follow this caution may result in environmental

damage.
Federal regulations require that you do not vent refrigerant to the

atmosphere. Recover during system repair or final unit disposal.

25H

FOLLOW THESE STEPS TO PROPERLY START UP
SYSTEM:

1. After system is evacuated, fully open liquid and vapor service

valves.
2. Unit is shipped with valve stem(s) closed and caps installed.
Replace stem caps after system is opened to refrigerant flow (back

seated). Replace caps finger--tight and tighten with wrench an
additional 1/12 turn.
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure set point
is below indoor ambient temperature.
5. Set room thermostat to HEAT or COOL and fan control to ON
or AUTO mode, as desired. Operate unit for 15 minutes. Check

system refrigerant charge.

CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in minor personal injury,

equipment damage or improper operation.
To prevent compressor damage or personal injury,

observe the following:

Do not overcharge system with refrigerant.

Do not operate unit in a vacuum or at negative pressure.

Do not disable low pressure switch in scroll compressor

applications.

Dome temperatures may be hot.

In 3 phase applications, incorrect phasing will cause reverse

rotation, resulting in elevated noise levels, equalized
pressures and reduced current draw. Correct by reversing
power connection L1 and L2 on contactor.

24 VAC HOT

RVS COOLING

HP THERMOSTAT

TYPICAL

FAN COIL

HEAT

PUMP

24 VAC COM

HEAT STAGE 2

COOL/HEAT

STAGE 1

INDOOR FAN

EMERGENCY

HEAT

*
*
*

IF AVAILABLE

LEGEND

24-V FACTORY WIRING

24-V FIELD WIRING

FIELD SPLICE CONNECTION

OUTDOOR THERMOSTAT

EMERGENCY HEAT RELAY

SUPPLEMENTAL HEAT RELAY

SHR

EHR

ODT

A02325 / A97413

Fig. 11 -- Generic Wiring Diagrams

(See Thermostat Installation Instructions for specific unit

combinations)

25H

SEQUENCE OF OPERATION

Turn on power to indoor and outdoor units. Transformer is

energized with power supplied.

COOLING

On a call for cooling, thermostat makes circuits R--O and R--Y,
and R--G. Circuit R--O energizes reversing valve, switching it to

cooling position. Circuit R--Y energizes contactor, starting
outdoor fan motor and compressor circuit. R--G energizes indoor

unit blower relay, starting indoor blower motor on high speed.
When thermostat is satisfied, its contacts open, de--energizing
contactor and blower relay. Compressor and motors should stop.

NOTE

: If indoor unit is equipped with a time--delay relay

circuit, the indoor blower will run an additional 90 seconds to
increase system efficiency.

HEATING

On a call for heating, thermostat makes circuits R--Y and R--G.

Circuit R--Y energizes contactor, starting outdoor fan motor and
compressor. Circuit R--G energizes indoor blower relay, starting

blower motor on high speed.
Should temperature continue to fall, R--W2 is made through

second--stage room thermostat. Circuit R--W2 energizes a relay,

bringing on first bank of supplemental electric heat and providing
electrical potential to second heater relay (if used). If outdoor

temperature falls below setting of outdoor thermostat (field
installed option), contacts close to complete circuit and bring on

second bank of supplemental electric heat.
When thermostat is satisfied, its contacts open, de--energizing
contactor and relay. All heaters and motors should stop after all

fan off delays.

OUTDOOR FAN

RELAY

Y OUTPUT TO PRESSURE

SWITCHES AND CONTACTOR

THERMOSTAT INPUTS

T1 - ENABLES DEFROST
TIMER. MUST BE
ENERGIZED FOR
DEFROST TIMER
TO START

C - COMMON

O - REVERSING VALVE

SPEEDUP

HK32EA001

DEFROST THERMOSTAT
MUST BE CLOSED BEFORE
DEFROST TIMER BEGINS

A05332

Fig. 12 -- Defrost Control

DEFROST

The defrost control is a time/temperature control which includes a

field selectable time period of 30, 60, or 90 minutes, factory set
to 90 minutes. This is the time the defrost thermostat must be

closed before the defrost cycle begins.
The electronic defrost timer sequence is enabled when the T1

input on the board is energized. The timer starts only when the

defrost thermostat is closed and the contactor is energized.
Defrost mode is identical to cooling mode except that outdoor fan

motor stops and second--stage heat is turned on to continue
warming conditioned spaces.
To initiate defrost, the defrost thermostat must be closed. This can

be accomplished as follows:
1. Turn off power to outdoor unit.
2. Disconnect outdoor fan motor lead from OF2 on control
board, see Fig. 12. Tape lead to prevent grounding.
3. Restart unit in heating mode, allowing frost to accumulate on
outdoor coil.
4. After a few minutes in heating mode, liquid line temperature

should drop below closing point of defrost thermostat
(approximately 30

F).

Short between speedup terminals with a flat--blade

screwdriver. This reduces the timing sequence to 1/256th of

original time. (See Table 3.)
6. When you hear reversing valve change position, remove
screwdriver immediately; otherwise, control will terminate

normal 10--minute defrost cycle in approximately 2 seconds.

NOTE

: Length of defrost cycle is dependent upon length of time

it takes to remove screwdriver from test pins after reversing valve
has shifted.

7. Unit will remain in defrost for remainder of defrost cycle time

or until defrost thermostat reopens at approximately 65

F coil

temperature of liquid line.
8. Turn off power to outdoor unit and reconnect fan motor lead

to OF2 on control board.

Table 3—Defrost Control Speedup--Timing Sequence

PARAMETER

MINIMUM

(MINUTES)

MAXIMUM

(MINUTES)

SPEEDUP

(NOMINAL)

30--minute cycle

7 sec

50--minute cycle

12 sec

90--minute cycle

21 sec

10--minute cycle

2 sec

5 minutes

4.5

5.5

1 sec

25H

Step 13.—Check Charge

Factory charge and charging method are shown on unit rating
plate. To check charge in cooling mode, refer to Cooling Only

Procedure. To check charge in heating mode, refer to Heating
Check Chart Procedure.
With unit operating, charge Puron units with liquid using a

commercial type metering device in manifold hose. Charge
refrigerant into suction line. Some refrigerant cylinders may

contain a dip tube that allows liquid refrigerant to flow from
cylinder in upright position. Check cylinder label for correct

position to allow liquid flow.

COOLING ONLY PROCEDURE

NOTE

: If subcooling charging conditions are not favorable,

charge must be weighed in accordance with unit rating plate,

0.6 oz/ft of 3/8 in. liquid line above or below 15 ft,

respectively. Favorable conditions fall within the ranges given on
the charging chart on the outdoor unit plate.

EXAMPLE:
To calculate additional charge required for a 25---ft. line set:

25 ft. --- 15 ft. = 10 ft. X 0.6 oz/ft. = 6 oz. of additional

charge.

Units installed with cooling mode TXV require charging with the

subcooling method.
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching an accurate
gage to service port.
3. Measure liquid line temperature by attaching an accurate

thermistor type or electronic thermometer to liquid line near
outdoor coil.
4. Refer to unit rating plate for required subcooling temperature.
5. Refer to Table 4. Find the point where required subcooling

temperature intersects measured liquid service valve pressure.
6. To obtain required subcooling temperature at a specific liquid

line pressure, add refrigerant if liquid line temperature is higher

than indicated or reclaim refrigerant if temperature is lower.
Allow a tolerance of

HEATING CHECK CHART PROCEDURE

To check system operation during heating cycle, refer to the

Heating Check Chart on outdoor unit. This chart indicates
whether a correct relationship exists between system operating

pressure and air temperature entering indoor and outdoor units. If
pressure and temperature do not match on chart, system

refrigerant charge may not be correct. Do not use chart to adjust

refrigerant charge.

NOTE

: In heating mode, check refrigerant charge only when

pressures are stable. If in doubt, remove charge and weigh in
correct refrigerant charge.

NOTE

: When charging is necessary during heating season,

charge must be weight in accordance with unit rating plate

0.6

oz/ft of 3/8 in. liquid line above or below 15 ft, respectively.

EXAMPLE:
To calculate additional charge required for a 25---ft. line set:

25 ft. --- 15 ft. = 10 ft. X 0.6 oz/ft. = 6 oz. of additional

charge.

Step 14.—Final Checks

IMPORTANT

: Before leaving job, be sure to do the following:

1. Ensure that all wiring is routed away from tubing and sheet
metal edges to prevent rub--through or wire pinching.
2. Ensure that all wiring and tubing is secure in unit before

adding panels and covers. Securely fasten all panels and covers.
3. Tighten service valve stem caps to 1/12--turn past finger tight.
4. Leave Users Manual with owner. Explain system operation
and periodic maintenance requirements outlined in manual.
5. Fill out Dealer Installation Checklist and place in customer

file.

CARE AND MAINTENANCE

For continuing high performance and to minimize possible

equipment failure, periodic maintenance must be performed on

this equipment.
Frequency of maintenance may vary depending upon geographic

areas, such as coastal applications. See Users Manual for
information.

25H

Table 4—Required Liquid--Line Temperature

Liquid

Pressure

at Service

Valve

Required Subcooling Temperature

(

(PSIG)

174

181

188

195

202

209

216

223

230

237

244

251

258

265

272

279

286

293

300

307

314

321

328

335

342

100

349

102

356

103

363

105

100

370

106

101

377

107

102

384

109

104

391

110

105

100

398

112

107

102

405

113

108

103

412

114

109

104

419

115

110

105

100

426

117

112

107

102

433

118

113

108

103

440

119

114

109

104

447

120

115

110

105

454

122

117

112

107

461

123

118

113

108

468

124

119

114

109

475

125

120

115

110

482

126

121

116

111

Liquid

Pressure

at Service

Valve

Required Subcooling Temperature

(

(PSIG)

489

127

122

117

112

496

129

124

119

114

503

130

125

120

115

510

131

126

121

116

517

132

127

122

117

524

133

128

123

118

531

134

129

124

119

538

135

130

125

120

545

136

131

126

121

552

137

132

127

122

559

138

133

128

123

566

139

134

129

124

573

140

135

130

125

580

141

136

131

126

587

142

137

132

127

594

143

138

133

128

601

144

139

134

129

608

145

140

135

130

25H

PURON



(R---410A) QUICK REFERENCE GUIDE

Puron



refrigerant operates at 50---70 percent higher pressures than R---22. Be sure that servicing equipment and replacement

components are designed to operate with Puron



Puron



refrigerant cylinders are rose colored.

Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.

Puron



systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when

charging into suction line with compressor operating

Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low---side retard.

Use hoses with 700 psig service pressure rating.

Leak detectors should be designed to detect HFC refrigerant.

Puron



, as with other HFCs, is only compatible with POE oils.

Vacuum pumps will not remove moisture from oil.

Do not use liquid---line filter driers with rated working pressures less than 600 psig.

Do not leave Puron



suction line filter driers in line longer than 72 hours.

Do not install a suction---line filter drier in liquid line.

POE oils absorb moisture rapidly. Do not expose oil to atmosphere.

POE oils may cause damage to certain plastics and roofing materials.

Wrap all filter driers and service valves with wet cloth when brazing.

A factory approved liquid---line filter drier is required on every unit.

Do NOT use an R---22 TXV.

If indoor unit is equipped with an R---22 TXV or piston metering device, it must be changed to a hard shutoff Puron



TXV.

Never open system to atmosphere while it is under a vacuum.

When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter

driers. Evacuate to 500 microns prior to recharging.

Do not vent Puron



into the atmosphere.

Do not use capillary tube coils.

Observe all

warnings

cautions

, and

bold

text.

All indoor coils must be installed with a hard shutoff Puron



TXV metering device.

7310 W. Morris St.

Indianapolis, IN 46231

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Catalog No: 25HBA--- 1SI

Replaces: NEW

Printed in U.S.A.

Edition Date: 11/05

25H