Start-Up; Check For Refrigerant Leaks; Locate And Repair Refrigerant Leaks And Charge The Unit As Follows; Start-Up Cooling Section And Make Adjustments - Payne PA3Z Installation Manual

d. Make sure that all tools and miscellaneous loose parts have been removed.
Use the Start-Up Checklist supplied at the end of this book and proceed as follows:
PROCEDURE 1—CHECK FOR REFRIGERANT LEAKS
A. LOCATE AND REPAIR REFRIGERANT LEAKS AND CHARGE THE UNIT AS FOLLOWS:
1. Using both high- and low-pressure ports, locate leaks and reclaim remaining refrigerant to relieve system pressure.
2. Repair leak following accepted practices.
NOTE: Install a liquid-line filter drier whenever the system has been opened for repair.
PROCEDURE 2—START-UP COOLING SECTION AND MAKE ADJUSTMENTS
CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component damage.
Complete the required procedures given in the Pre-Start- Up section this page before starting the unit. Do not jumper any
safety devices when operating the unit.
Do not operate the compressor in cooling mode when the outdoor temperature is below 40 F.
Do not rapid-cycle the compressor. Allow 5 minutes between ''on'' cycles to prevent compressor damage.
A. CHECKING COOLING CONTROL OPERATION
Start and check the unit for proper cooling control operation as follows:
1. Place room thermostat SYSTEM switch in OFF position. Observe that blower motor starts when FAN switch is placed in ON position and
shuts down within 60 seconds (for 024-042) or 90 seconds (for 048 and 060) when FAN switch is placed in AUTO position.
2. Place SYSTEM switch in COOL position and FAN switch in AUTO position. Set cooling control below room temperature. Observe that
compressor, outdoor fan, and indoor blower motors start and that reversing valve shifts. Observe that cooling cycle shuts down when control
setting is satisfied. Reversing valve (RV) remains energized.
3. When using an automatic changeover room thermostat, place both SYSTEM and FAN switches in AUTO. positions. Observe that unit
operates in Cooling mode when temperature control is set to ''call for cooling'' (below room temperature), and unit operates in Heating
mode when temperature control is set to "call for heating" (above room temperature).
PROCEDURE 3—REFRIGERANT CHARGE
Refrigerant Charge — Amount of refrigerant charge is listed on unit nameplate and in Table 2. Refer to Bryant Refrigerant Service Techniques
Manual, Refrigerants section. Unit panels must be in place when unit is operating during charging procedure. Unit must operate a minimum of
15 minutes before checking charge.
A. NO CHARGE
Refer to Bryant Refrigerant Service Techniques. Use standard evacuating techniques. After evacuating system, weigh in the specified amount of
refrigerant (refer to Table 2).
B. LOW CHARGE COOLING
024-042 units:
1. Measure suction line pressure by attaching a gauge to the service port
2. Measure the suction line temperature by attaching a temperature sensing device to it.
3. Insulate the temperature sensing device so that the outdoor ambient doesn't affect the reading.
Fig. 8—Control Box Wiring

START-UP

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