Bryant 226A Installation Instructions Manual

226A
Preferredt Series 2−Stage Heat Pump
with Puronr Refrigerant
2 To 5 Nominal Tons

Installation Instructions

SAFETY CONSIDERATIONS

NOTE: Read the entire instruction manual before starting the

installation.
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 would 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.

!

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.

WARNING

!

WARNING

EXPLOSION HAZARD

Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.

Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.

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. (25.4
mm) 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

THROUGH THE WALL

HANGER STRAP

(AROUND SUCTION

TUBE ONLY)

1” (25.4 mm)

MIN

SUSPENSION

Fig. 1 − Piping 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.

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

LIQUID TUBE

SUCTION TUBE

JOIST

INSULATION

SUCTION TUBE

LIQUID TUBE

A94026

INSTALLATION

!

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.

IMPORTANT: Effective January 1, 2015, all split system and
packaged air conditioners must be installed pursuant to applicable
regional efficiency standards issued by the Department of Energy.

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

226A

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
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,±9.5 mm/m.)
per compressor manufacturer specifications.

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

View From Top

UNIT BASE PAN

Dimension in. (mm)

35 X 35

(889 X 889)

Fig. 2 − Tiedown Knockout Locations

TIEDOWN KNOCKOUT LOCATIONS in. (mm)

A B C

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

A05177

Operating Ambient

The minimum outdoor operating ambient in cooling mode is 55°F
(12.78°C) without accessories and as low as 0_F (−17.78_C) with
approved low−ambient accessory kits, and the maximum outdoor
operating ambient in cooling mode is 120°F (48.89°C). The
maximum outdoor operating ambient in heating mode is 66°F
(18.89°C).

NOTE: Units operating at high stage operation, 208v (or below)
line voltage, and at an outdoor ambient of 120°F (48.9°C) (or
greater), may experience compressor thermal trip.

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

!

UNIT OPERATION HAZARD

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

Locate the unit in such a way that it is stable in all
circumstances including adverse weather conditions.

CAUTION

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.

DEFROST
THERMOSTAT

A97517

Fig. 3 − Defrost Thermostat Location

Elevate Unit

!

UNIT OPERATION HAZARD

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

Do not allow water and/or ice to build up in base pan.

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

2

CAUTION

Table 1 – Accessory Usage

Required for Low Ambient

Accessory

Compressor Start Assist Capacitor and Relay Ye s Ye s No
Crankcase Heater Yes (standard) Yes (standard) No
Evaporator Freeze Thermostat Ye s No No

Hard Shutoff TXV

Isolation Relay Ye s No No

Liquid Line Solenoid Valve No

Low-Ambient Pressure Switch Ye s No No
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, refer to Residential Piping and Longline Guideline.

Cooling Applications
(Below 55°F / 12.8°C)

(standard w/factory approved

Ye s

indoor unit)

Required for Long Line

Applications*

(standard w/factory approved

and Long Line Guideline

Ye s

indoor unit)

See Residential Piping

Required for Sea Coast

Applications

(within 2 miles/3.2 km)

(standard w/factory approved

Ye s

indoor unit)

No

In Long−Line Applications, Install Liquid−Line
Solenoid Valve (LSV)

For refrigerant piping arrangements with equivalent lengths greater
than 80 ft. (24.38 m) and/or when elevation difference between
indoor and outdoor unit is greater than ±20 ft. (±6.10 m), follow
all requirements of the Residential Piping and Long−Line
Guideline. If required by Long−Line Guideline, install LSV kit,
part no. KHALS0401LLS, specifically designed for PuronR
refrigerant heat pumps. LSV should be installed within 2 ft. (0.61
m) of outdoor unit with flow arrow pointing toward outdoor unit.
Follow the Installation Instructions included with accessory kit.

IMPORTANT: Flow arrow must point toward outdoor unit.

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.

Federal regulations require that you do not vent refrigerant
into the atmosphere. Recover refrigerant during system repair
or final unit disposal

!

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 (24.4 m),
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.

WARNING

CAUTION

Outdoor Unit Connected to Factory Approved Indoor
Unit:

Outdoor unit contains the correct system refrigerant charge for
operation with factory approved, AHRI rated, indoor unit with
highest sales volume 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.

Service Valves

Service valves are closed and plugged from the factory. Outdoor
units are shipped with a refrigerant charge sealed in the unit. Leave
the service valves closed until all other refrigerant system work is
complete or the charge will be lost. Leave the plugs in place until
line set tubing is ready to be inserted.

Heat pumps require a piston metering device in the liquid service
valve for proper heating operation. Piston is shipped in the piston
body of the liquid service valve, temporarily held in place with a
plastic cap. Do not remove the plastic cap until line set tubing is
ready to be installed.

Refer to Fig. 4 and follow these steps for piston installation:

1. Remove plastic cap holding piston in piston body of liquid
service valve.

2. Check that piston size (stamped on side of piston) matches
with number listed on unit rating plate. Return piston to pis­ton body of liquid service valve (either direction).

3. Find plastic bag taped to unit containing copper adapter
tube, brass nut, and plastic washer.

4. Install plastic washer in the seat inside piston body.

5. Fit brass nut onto adapter tube and install tube onto liquid
service valve. Tighten nut finger tight, then wrench addi­tional ½ turn only [15−ft lbs (20.3 N−m)]. Over tightening
may damage the plastic washer and service valve’s piston
body.

BRASS NUT

ADAPTER TUBE

PLASTIC WASHER

PISTON

PISTON BODY

LIQUID SERVICE VALVE

A14235

Fig. 4 − Liquid Service Valve with Heating Piston and

Adapter Tube

226A

3