Bryant Preferred 227T - User Manual

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 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.
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.
A07588
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.
227T
Preferred™ Series 2-Stage Heat Pump
with Puron Refrigerant
2 To 5 Tons
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.
WARNING
!
EXPLOSION HAZARD
Failure to follow this warning could result in
death, serious personal injury, death, and/or
property damage.
Never use air or any gas containing oxygen for
leak testing or operating refrigerant
compressors. Never allow compressor suction
pressure to operate in a vacuum with service
valves closed. See Service Manual for
pump-down instructions.

Bryant Preferred 227T Specifications

General

Stages	2
SEER	Up to 17
HSPF	9.5
Energy Star	Yes
Voltage	208/230
Phase	1
Refrigerant	Puron®

Summary

Safety Considerations

Electrical Shock Hazard

Warning about potential death or injury from electrical shock due to improper handling.

Explosion Hazard

Warning about potential death, injury, or property damage from explosion due to improper handling.

Installation Recommendations

Piping Installation

Guidelines for routing and securing refrigerant tubing to prevent vibration and noise.

Unit Location

Recommendations for locating the unit away from living areas to minimize noise impact.

Installation Procedures

Cut Hazard

Warning about sharp metal edges and the need for protective gear during handling.

Check Equipment and Job Site

Instructions for checking unit and job site compliance with standards and inspecting equipment.

Install on a Solid, Level Mounting Pad

Guidelines for mounting the unit securely and level on a pad, including tie-down locations.

Elevate Unit

Requirement to elevate the unit for drainage and clearance above snowfall.

Piping and Connections

Personal Injury and Environmental Hazard

Warnings about refrigerant handling, venting, and potential injury or environmental damage.

Unit Damage Hazard

Caution regarding burying refrigerant tubing and requirements for vertical rise.

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

Instructions for installing LSV in long-line applications based on guidelines.

Service Valves

Procedure for installing the heating piston and adapter tube in the liquid service valve.

Brazing Procedures

Fire Hazard

Warning about refrigerant/oil igniting during brazing; charge must be removed first.

Unit Damage Hazard

Caution to use heat-sinking material on service valves during brazing to prevent damage.

Burn Hazard

Warning about hot components after brazing and the need for appropriate PPE.

Install Liquid Line Filter Drier

Unit Damage Hazard

Requirement to install filter drier in liquid line and use heat sinking during brazing.

Evacuation and Vacuum

Unit Damage Hazard

Caution against using the system compressor as a vacuum pump.

Deep Vacuum Method

Procedure for deep vacuum evacuation using a pump and gauge to 500 microns.

Electrical Connections

Electrical Shock Hazard

Warning about electrical shock hazard and ensuring proper grounding for safety.

Connect Ground and Power Wires

Instructions for connecting ground and power wires to the control box and contactor.

Connect Control Wiring

Guidelines for routing and connecting 24v control wires to thermostat and unit.

System Setup and Configuration

Final Wiring Check

Check factory and field wire connections for security and proper routing.

Compressor Crankcase Heater

Instructions for powering the crankcase heater for 24 hours before unit start-up.

Install Electrical Accessories

General instruction to refer to individual accessory kits for installation.

Airflow Selections (ECM Furnaces)

Configuration of blower operation for high and low stage cooling on ECM furnaces.

Airflow Selection for Variable Speed Furnaces

Adjusting blower speeds for high and low stage cooling on variable speed furnaces.

Start-Up Procedures

Personal Injury Hazard

Warning for personal injury when handling refrigerant; use safety gear.

Environmental Hazard

Warning about environmental damage from venting refrigerant; recovery is required.

Unit Operation and Safety Hazard

Cautions regarding overcharging, vacuum operation, low pressure switch, and hot compressor domes.

Follow these steps to properly start up system

Step-by-step guide for starting up the system after evacuation.

Operation Sequences

Sequence of Operation

Description of 5-minute lockout timer and 2-stage thermostat operation for cooling/heating.

Cooling Operation

Details on how Y1, Y2, and O signals control compressor and fan during cooling stages.

Heating Operation

Details on how Y1 and Y2 signals control compressor and fan during heating stages.

Compressor Operation

Explanation of the 2-stage compressor's internal unloading mechanism and modulation.

Quiet Shift-2

Description of the field-selectable mode to reduce noise during defrost cycles.

Defrost Control

Defrost Control Settings

Field-selectable time/temperature settings for initiating the defrost sequence.

Defrost Speedup

Procedure to initiate a forced defrost by shorting speedup pins.

Charge and Performance Checks

Check Charge

Procedure for checking system refrigerant charge under favorable conditions.

Heating Check Chart Procedure

Using the heating check chart to verify system operating pressure and air temperature.

Verify units for proper switching between low & high stages

Checking suction pressures and compressor current for correct stage switching.

Unloader Test and Final Checks

Unloader Test Procedure

Methods to verify compressor unloader operation by measuring amperage and coil resistance.

Final Checks

Ensuring wiring security, tightening valve caps, and preparing for owner handover.

Troubleshooting

Table for verifying compressor winding resistance to diagnose system malfunction.