Bryant LEGACY 224A, Preferred 225B, 24APA, Preferred 223A Installation Instructions Manual

223A, 225B
Preferredt Series Heat Pump
with Puronr Refrigerant
1--1/2 To 5 Nominal Tons

Installation Instructions

NOTE: Read the entire instruction manual before starting the

installation.

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
current editions of the National Electrical Code ( NEC ) NFPA 70.
In Canada, refer to current editions of the Canadian electrical code
CSA 22.1.

!

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.

!

CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and

wear appropriate protective clothing and gloves when
handling parts.

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.

1.)

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. 1.)

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. 1.)

10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.

OUTDOOR WALL INDOOR WALL

CAULK

INSULATION

HANGER STRAP

(AROUND SUCTION

TUBE ONLY)

1” (25.4 mm)

MIN

THROUGH THE WALL

SUSPENSION

LIQUID TUBE

SUCTION TUBE

JOIST

INSULATION

SUCTION TUBE

LIQUID TUBE

Fig. 1 -- Connecting Tubing Installation

When outdoor unit is connected to factory--approved indoor unit,
outdoor unit contains system refrigerant charge for operation with
AHRI rated indoor unit when connected by 15 ft. (4.57 m) 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.

A07588

IMPORTANT: Always install the factory--supplied liquid--line
filter drier. Obtain replacement filter driers from your distributor or
branch.

INSTALLATION

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.

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. 2
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

223A / 225B

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 (8.05 km/h)
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 ±2° (±3/8 in./ft) per
compressor manufacturer specifications.

Clearance Requirements

When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 24 in. (609.6 mm)
clearance to service end of unit and 48 in. (1219.2 mm) (above
unit. For proper airflow, a 6--in. (152.4 mm) clearance on 1 side of
unit and 12--in. (304.8 mm) on all remaining sides must be
maintained. Maintain a distance of 24 in. (609.6 mm) between
units. Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.

On rooftop applications, locate unit at least 6 in. (152.4 mm)
above roof surface.

Operating Ambient

The minimum outdoor operating ambient in cooling mode
without accessory is 55°F (12.78°C), and the maximum outdoor
operating ambient in cooling mode is 125°F (51.67°C). The
maximum outdoor operating ambient in heating mode is 66 °F
(18.89°C).

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. 3.) 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

STUB TUBE

DEFROST
THERMOSTAT

A97517

Fig. 3 -- Defrost Thermostat Location

Make Piping Connections

!

PERSONAL INJURY AND ENVIRONMENTAL
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.

Use all service ports and open all flow--control devices,
including solenoid valves.

!

WARNING

CAUTION

3/8---in. (9.53 mm) Dia.
Tiedown Knock outs in
Basepan(2) Places

View From Top

UNIT BASE PAN

Dimension in. (mm)

26 X 26

(660 X 660)

31–1/2 X 31–1/2

(800 X 800)

35 X 35

(889 X 889)

TIEDOWN KNOCKOUT LOCATIONS in. (mm)

A B C

9–1/8 (231.8) 4–7/16 (112.7) 21–1/4 (539.8)

9–1/8 (231.8) 6–9/16 (166.7) 24–11/16 (627.1)

9–1/8 (231.8) 6–9/16 (166.7) 28–7/16 (722.3)

Fig. 2 -- Tiedown Knockout Locations

A05177

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 (152.4
mm). vertical rise at service valve. Refrigerant tubing lengths
up to 36--in (914.4 mm). may be buried without further special
consideration. Do not bury lines longer than 36 in (914.4 mm).

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 Residential Piping and Long Line
Guideline will reduce these losses. Refer to Table 1 for accessory
requirements. Refer to Table 2 for field tubing diameters.

There are no buried--line applications greater than 36 in. (914.4
mm)

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.

2

Table 1 – Accessory Usage

Y

REQUIRED FOR LOW---AMBIENT

Accessory

Accumulator Standard Standard Standard

Ball Bearing Fan Motor Ye s { No No

Compressor Start Assist Capacitor and

Relay

Crankcase Heater Ye s

Evaporator Freeze Thermostat Ye s No No

Hard Shutoff TXV Ye s Ye s Yes

Isolation Relay Ye s No No

Liquid Line Solenoid Valve No See Long---Line Application Guideline No

Motor Master® Control or

Low Ambient Switch

Support Feet Recommended No Recommended

* For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.09 m) vertical differential, ref e r to Residential Piping and Longline Guideline.
{ Additional requirement for Low ---Ambient Controller (full modulation feature) MotorMasterr Control.

Always Ask For

COOLING APPLICATIONS

(Below 55°F / 12.8°C)

Ye s Ye s No

Ye s No No

REQUIRED FOR

LONG LINE APPLICATIONS*

Ye s

REQUIRED FOR

SEA COAST APPLICATIONS

(Within 2 miles / 3.22 km)

No

Outdoor Unit Connected To Factory Approved Indoor
Unit

Outdoor unit contains correct system refrigerant charge for
operation with approved ARI rated indoor unit when connected by
15 ft (4.57 m) of field--supplied or factory--accessory tubing, and
factory supplied filter drier. Check refrigerant charge for maximum
efficiency.

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.

!

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

Service valves must be wrapped in a heat--sinking material
such as a wet cloth while brazing.

Remove plastic retainer holding outdoor piston in liquid service
valve, leaving the piston and piston retainer inside the valve.
Connect sweat/flare adapter provided, to valve. (See Fig. 4.)
Connect refrigerant tubing to fittings on outdoor unit vapor and
liquid service valves. Service valves are closed from factory and
ready for brazing. After wrapping service valve with a wet cloth,
tubing set can be brazed to service valve using either silver bearing
or non--silver bearing brazing material. Do not use soft solder
(materials which melt below 800°F/427°C). Consult local code
requirements. Refrigerant tubing and indoor coil are now ready for
leak testing. This check should include all field and factory joints.

CAUTION

Table 2 – Refrigerant Connections and Recommended Liquid

and Vapor Tube Diameters (In.)

UNIT SIZE

018, 024 3/8 3/8 5/8 5/8
030, 036 3/8 3/8 3/4 3/4
042, 048 3/8 3/8 7/8 7/8
060, 061 3/8 3/8 7/8 1--1/8

* Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for performance

data when using different size and length linesets.

Notes:

1. Do not apply capillary tube i ndoo r coils to these units.

2. For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or
20 ft. (6.1 m) vertical differe ntial, refer to the R esidenti al Pi ping a nd Longli ne
Guideli ne using Puron re frigera nt.

Connection

LIQUID RATED VAPOR*

Diameter

Tub e

Diameter

Connection

Diameter

Tub e

Diameter

Installing with Indoor Piston

Outdoor Unit Connected to Factory Approved Indoor Unit

Check piston size shipped with indoor unit to see if it matches
required indoor piston size. If it does not match, replace indoor
piston with correct piston size.

NOTE: Correct pistons are shipped with outdoor units in the
accessory bag and are only qualified for piston fan coils. Example
fan coils with piston: FB4C and FY5B (1.5 through 4 ton)

When changing indoor piston, use a back−up wrench. Hand
tighten hex nut, then tighten with wrench 1/2 turn. Do not exceed
30 ft−lbs. The indoor piston contains a Teflon ring (or seal) which
is used to seat against the inside of distributor body, and must be
installed properly to ensure proper seating. See Fig. 5.

13/16” BRASS HEX NUT

TEFLON® SEAL

TEFLON®
RINGS

3/4” BRASS HEX BOD

“H” DISTRIBUTOR

223A / 225B

Fig. 4 -- Liquid Service Valve

PISTON

PISTON RETAINER

A10342

Fig. 5 -- Indoor Piston Installation

A05226

3

Install Liquid Line Filter Drier Indoor

Refer to Fig. 6 and install filter drier as follows:

1. Braze 5 in. (127 mm) liquid tube to the indoor coil.

2. Wrap filter drier with damp cloth.

3. Braze filter drier to 5 in. (127 mm) long liquid tube from
step 1.

4. Connect and braze liquid refrigerant tube to the filter drier.

Fig. 6 -- Liquid Line Filter Drier

A05227

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.

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 unit in system where voltage may fluctuate above or below
permissible limits.

Make Electrical Connections

!

WARNING

!

UNIT DAMAGE HAZARD

223A / 225B

Failure to follow this caution may result in equipment damage
or improper operation.

Installation of filter drier in liquid line is required.

CAUTION

Evacuate Refrigerant Tubing and Indoor Coil

!

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used (see triple evacuation
procedure in service manual). Always break a vacuum with dry
nitrogen.

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. A tight dry system will hold a vacuum of 1000
microns after approximately 7 minutes. See Fig. 7.

5000
4500
4000
3500
3000
2500
2000

MICRONS

1500
1000

500

01234567

MINUTES

Fig. 7 -- Deep Vacuum Graph

LEAK IN
SYSTEM

VACUUM TIGHT
TOO WET

TIGHT
DRY SYSTEM

A95424

A95424

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or
death.

Do not supply power to unit with compressor terminal box
cover removed.

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.

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. 8.

!

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.

DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES

FIELD POWER

WIRING

FIELD GROUND

WIRING

WARNING

GROUND
LUG

Fig. 8 -- Line Connections

CONTACTOR

A91056

4

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. 9.)

Use No. 18 AWG color--coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft (30.5 m) 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.

CompressorCrankcaseHeater

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. (24.4 m), or when outdoor unit is 20 ft. (6.1 m) below the
indoor unit. Refer to the Residential Piping and Long Line
Guideline.

Install Electrical Accessories

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

Start--Up

!

PERSONAL INJURY HAZARD

Failure to follow this caution may result in personal
injury.

Wear safety glasses, protective clothing, and gloves when
handling refrigerant and observe the following:

S Front seating service valves are equipped with Schrader valves.

!

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.

CAUTION

CAUTION

!

CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in personal injury,
equipment damage or improper operation.

S Do not overcharge system with refrigerant.
S Do not operate unit in a vacuum or at negative pressure.
S Do not disable low pressure switch in scroll compressor

applications.

S Compressor dome temperatures may be hot.

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) front seated (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.

HP THERMOSTAT

24 VAC HOT

24 VAC COM

HEAT STAGE 2

COOL/HEAT
STAGE 1

INDOOR FAN

RVS COOLING

EMERGENCY
HEAT

R

C

W2

Y

G

O

E

ODT

EHR

SHR

TYPICAL
FAN COIL

R

C

W2

E

W3

G

IF AVAILABLE

*

LEGEND

24-V FACTORY WIRING

24-V FIELD WIRING

FIELD SPLICE CONNECTION

OUTDOOR THERMOSTAT

EMERGENCY HEAT RELAY

SUPPLEMENTAL HEAT RELAY

Fig. 9 -- Generic Wiring Diagrams

(See Thermostat Installation Instructions

for specific unit combinations)

HEAT
PUMP

R

C

*

W2

*
*

Y

O

A02325 / A97413

223A / 225B

5

Sequence of

Operation

NOTE: Defrost control board is equipped with 5 minute lockout

timer that is initiated upon any interruption of power.
Turn on power to indoor and outdoor units. Transformer is

energized.

Cooling

On a call for cooling, thermostat makes circuits R--O, R--Y, and
R--G. Circuit R--O energizes reversing valve, switching it to
cooling position. Circuit R--Y sends low voltage through the
safeties and energizes the T1 terminal on the circuit board. If the
compressor has been off for 5 minutes, or power has not been
cycled for 5 minutes, the OF2 relay and T2 terminal will energize.
This will close the contactor, and start the outdoor fan motor and
compressor.

When the cycle is complete, R--Y is turned off, stopping the
compressor and outdoor fan. The 5 minute time guard begins
counting. Compressor will not come on again until this delay
expires. In the event of a power interruption, the time guard will
not allow another cycle for 5 minutes.

NOTE: If the indoor blower off delay is enabled, it will run up to
an additional 90 seconds to increase system efficiency.

Heating

223A / 225B

On a call for heating, thermostat makes circuits R--Y and R--G.
Circuit R--Y sends low voltage through the safeties and energizes
the T1 terminal on the circuit board. T1 energizes the defrost logic
circuit. If the compressor has been off for 5 minutes, or power
has not been cycled for 5 minutes, the OF2 relay and T2 terminal
will energize. This will close the contactor, start the outdoor fan
motor and compressor.

When the cycle is complete, R--Y is turned off , stopping the
compressor and outdoor fan. The 5 minute time guard begins
counting. Compressor will not come on again until this time delay
expires. In the event of a power interruption, the time guard will
not allow another cycle for 5 minutes.

Quiet Shift

Quiet shift is a field selectable defrost mode (factory set to OFF),
which will eliminate occasional noise that could be heard at the
start of defrost cycle and restarting of heating cycle. It is selected
by placing DIP switch 3 on defrost board (see Fig. 10) in the ON
position.

When Quiet Shift switch is placed in ON position, and a defrost is
initiated, the following sequence of operation will occur. Reversing
valve will energize, compressor will turn off for 30 seconds, and
then turn back on to complete defrost. At the start of heating after
conclusion of defrost, reversing valve will de--energize,
compressor will turn off for another 30 seconds, and the fan will
turn off for 40 seconds, before starting in the heating mode.

Defrost

The defrost control is a time/temperature control which has field
selectable settings of 30, 60, 90, or 120 minutes, factory set to 90
minutes. These settings represent the amount of time that must pass
after closure of the defrost thermostat before the defrost sequence
begins.

The defrost thermostat senses coil temperature throughout the
heating cycle. When the coil temperature reaches the defrost
thermostat setting of approximately 32_F(0_C), it will close,
which energizes the DFT terminal and begins the defrost timing
sequence. When the DFT has been energized for the selected time,
the defrost cycle begins. Defrost cycle is terminated when defrost
thermostat opens, or automatically after 10 minutes.

Defrost Speedup

To initiate a forced defrost, speedup pins (J1) must be shorted with
a flat head screwdriver for 5 seconds and RELEASED.Ifthe
defrost thermostat is open, a short defrost cycle will be observed
(actual length dependson Quiet Shift switch position). When Quiet
Shift is off, only a short 30 second defrost cycle is observed. With
Quiet Shift ON, the speedup sequence is one minute; 30 second
compressor off period followed by 30 seconds of defrost with
compressor operation. When returning to heating mode, the
compressor will turn off for an additional 30 seconds and the fan
for 40 seconds.

If the defrost thermostat is closed, a complete defrost cycle is
initiated. If the Quiet Shift switch is turned on, the compressor will
be turned off for two 30 second intervals as explained previously.

O R W

2

Y C

SPEEDUP

P1

J1

DFT

Speedup
Pins

T2 C C O

DFT

T1 Y

P3

INTERVAL TIMER

OFF

OF2

30

60

120

90

60

30

ON

QUIET

SHIFT

Quiet
Shift

Defrost interval
DIP switches

HK32EA003

O
F1

A05378

Fig. 10 -- Defrost Control

6

Check Charge

Factory charge amount and desired subcooling are shown on unit
rating plate. Charging method is shown on information plate inside
unit. To properly check or adjust charge, conditions must be
favorable for subcooling charging. Favorable conditions exist
when the outdoor temperature is between 70_F and 100_F
(21.11_C and 37.78_C), and the indoor temperature is between
70_F and 80_F (21.11_C and 26.67_C). Follow the procedure
below:

Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge
by adding or removing 0.6 oz/ft (.018 kg/m) of 3/8 liquid line
above or below 15ft (4.57 m) respectively.

For standard refrigerant line lengths (80 ft/24.38 m or less), allow
system to operate in cooling mode at least 15 minutes. If conditions
are favorable, check system charge by subcooling method. If any
adjustment is necessary, adjust charge slowly and allow system to
operate for 15 minutes to stabilize before declaring a properly
charged system.

If the indoor temperature is above 80_F (26.67_C), and the
outdoor temperature is in the favorable range, adjust system charge
by weight based on line length and allow the indoor temperature to
drop to 80_F (26.67_C) before attempting to check system charge
by subcooling method as described above.

If the indoor temperature is below 70_F (21.11_C), or the outdoor
temperature is not in the favorable range, adjust charge for line set
length above or below 15ft (4.57 m) only. Charge level should then
be appropriate for the system to achieve rated capacity. The charge
level could then be checked at another time when the both indoor
and outdoor temperatures are in a more favorable range.

NOTE: If line length is beyond 80 ft (24.38 m) or greater than 20
ft (6.10 m) vertical separation, See Long Line Guideline for
special charging requirements.

Units with Cooling Mode TXV

Units installed with cooling mode TXV require charging by 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 3. 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 3_F.

Units with Indoor Pistons

Units installed with indoor pistons require charging by the
superheat method.

The following procedure is valid when indoor airflow is within
21 percent of its rated CFM.

1. Operate unit a minimum of 10 minutes before checking
charge.

2. Measure suction pressure by attaching an accurate gage to
suction valve service port.

3. Measure suction temperature by attaching an accurate ther­mistor type or electronic thermometer to suction line at ser­vice valve.

4. Measure outdoor air dry--bulb temperature with thermomet­er.

5. Measure indoor air (entering indoor coil) wet--bulb temper­ature with a sling psychrometer.

6. Refer to Table 4. Find outdoor temperature and evaporator
entering air wet--bulb temperature. At this intersection, note
superheat. Where a dash (----) appears on the table, do not
attempt to charge system under these conditions or refriger­ant slugging may occur. Charge must be weighted in,
adding or removing 0.6 oz/ft of 3/8 liquid line above or be­low 15 ft (4.57 m) respectively.

7. Refer to Table 5. Find superheat temperature located in item
6 and suction pressure. At this intersection, note suction line
temperature.

8. If unit has a higher suction line temperature than charted
temperature, add refrigerant until charted temperature is
reached.

9. If unit has a lower suction line temperature than charted
temperature, reclaim refrigerant until charted temperature is
reached.

10. When adding refrigerant, charge in liquid form into suction
service port using a flow--restricting device.

11. If outdoor air temperature or pressure at suction valve
changes, charge to new suction line temperature indicated
on chart.

12. Optimum performance will be achieved when the operating
charge produces 5_ to 6_F suction superheat at suction
service valve with 82_F outdoor ambient and 80_F
(26.7_C) dry bulb (67_F / 19.4_C) wet bulb) indoor
temperature (DOE “B” test conditions) at rated airflow.

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.

223A / 225B

7

223A / 225B

LIQUID PRESSURE AT

SERVICE VALVE (PSIG )

251 76 74 72 70 68 66
259 78 76 74 72 70 68
266 80 78 76 74 72 70
274 82 80 78 76 74 72
283 84 82 80 78 76 74
291 86 84 82 80 78 76
299 88 86 84 82 80 78
308 90 88 86 84 82 80
317 92 90 88 86 84 82
326 94 92 90 88 86 84
335 96 94 92 90 88 86
345 98 96 94 92 90 88
354 100 98 96 94 92 90
364 102 100 98 96 94 92
374 104 102 100 98 96 94
384 106 104 102 100 98 96
395 108 106 104 102 100 98
406 110 108 106 104 102 100
416 112 110 108 106 104 102
427 114 112 110 108 106 104
439 116 114 112 110 108 106
450 118 116 114 112 110 108
462 120 118 116 114 112 110
474 122 120 118 116 114 112
486 124 122 120 118 116 114
499 126 124 122 120 118 116
511 128 126 124 122 120 118

Table 3 – Required Liquid Line Temperatures _F

REQUIRED SUBCOOLING TEMPERATURE (° F)

8 10 12 14 16 18

Table 4 – Superheat Charging (Heat Pump Only)

OUTDOOR TEMP (° F)

55 11 11 12 12 12 13 17 20 24 24 25 25 25 25
60 6 6 7 7 7 7 12 16 21 22 23 23 23 23
65 --- --- --- --- --- 3 7 12 18 19 21 21 22 22
70 --- --- --- --- --- --- --- 7 14 16 18 20 20 20
75 --- --- --- --- --- --- --- 3 11 13 16 18 18 19
82 --- --- --- --- --- --- --- --- *6 8 12 15 16 17
85 --- --- --- --- --- --- --- --- 4 7 11 14 15 16
90 --- --- --- --- --- --- --- --- --- 4 8 12 14 15

95 --- --- --- --- --- --- --- --- --- --- 6 10 12 14
100 --- --- --- --- --- --- --- --- --- --- 4 8 11 12
105 --- --- --- --- --- --- --- --- --- --- 3 6 9 11
110 --- --- --- --- --- --- --- --- --- --- --- 5 7 10
115 --- --- --- --- --- --- --- --- --- --- --- 3 6 8

*Optimum performance point, 82 ° F outdoor ambient and (80 ° F dry bulb),( 67 ° F wet bulb) indoor conditions. (DOE B Test Conditions)
Where a dash ( --- ---) appears do not attempt to charge system under these conditions or refrigerant slugging may occur. Charge must be weighed in.

Note: Superheat ° F is at low---side service port, Allow a tolerance of ± 3 ° F
Note: Indoor dry bulb between 70 ° F and 80 ° F

50 52 54 56 58 60 62 64 67 68 70 72 74 76

EVAPORATOR ENTERING AIR TEMPERATURE (° F WB)

Table 5 – Required Suction--Line Temperature

SUPERHEAT TEMP

(° ˚F)

0 35 37 39 41 43 45 47 49 51
2 37 39 41 43 45 47 49 51 53
4 39 41 43 45 47 49 51 53 55
6 41 43 45 47 49 51 53 55 57

8 43 45 47 49 51 53 55 57 59
10 45 47 49 51 53 55 57 59 61
12 47 49 51 53 55 57 59 61 63
14 49 51 53 55 57 59 61 63 65
16 51 53 55 57 59 61 63 65 67
18 53 55 57 59 61 63 65 67 69
20 55 57 59 61 63 65 67 69 71
22 57 59 61 63 65 67 69 71 73
24 59 61 63 65 67 69 71 73 75
26 61 63 65 67 69 71 73 75 77
28 63 65 67 69 71 73 75 77 79
30 65 67 69 71 73 75 77 79 81

107.8 112.2 116.8 121.2 126 130.8 138.8 140.8 145.8

SUCTION PRESSURE AT SERVICE PORT (PSIG)

8

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 Owner’s 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.

223A / 225B

9

PURONR (R--410A) QUICK REFERENCE GUIDE

S 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

S Puron refrigerant cylinders are rose colored.
S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
S 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

S Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low--side retard.
S Use hoses with 700 psig service pressure rating.
S Leak detectors should be designed to detect HFC refrigerant.
S Puron, as with other HFCs, is only compatible with POE oils.
S Vacuum pumps will not remove moisture from oil.
S Do not use liquid--line filter driers with rated working pressures less than 600 psig.
S Do not leave Puron suction line filter driers in line longer than 72 hours.
S Do not install a suction--line filter drier in liquid line.
S POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
S POE oils may cause damage to certain plastics and roofing materials.

223A / 225B

S Wrap all filter driers and service valves with wet cloth when brazing.
S A factory approved liquid--line filter drier is required on every unit.
S Do NOT use an R--22 TXV.
S If indoor unit is equipped with an R--22 TXV or piston metering device, it must be changed to a hard shutoff Puron TXV.
S Never open system to atmosphere while it is under a vacuum.
S 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.

S Do not vent Puron into the atmosphere.
S Do not use capillary tube coils.
S Observe all warnings, cautions,andbold text.
S All indoor coils must be installed with a hard shutoff Puron TXV metering device.

E2010 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 07/10

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

10

Catalog No. II223A--- 2 5 B --- 0 7

Replaces: II223A---25B --- 06