Reznor ZQYRA Unit Installation Manual - Manual (Page 18)

Form I-ZQYRA P/N 260414R5, Page 18
7.0 Electrical and
Wiring (cont’d)
FIGURE 19 - TXV Valves
on Heat Pump Coils
Check V
alve
Flow Direction
Expansion V
alve
Flow Direction
Thermostatic
Expansion
Valve
TXV Bulb Location
Check V
alve
Flow Direction
Expansion V
alve
Flow Direction
Thermostatic
Expansion
Valve
TXV Bulb Location
Compressor
Condenser Coil
Evaporator Coil
Control Side View
Side Opposite Controls View
(partial view)
Condensate Drain
Coils The heat pump has highly efficient evaporator and condenser coils and a cleanable
condensate drain pan. When the heat pump is in a defrost state, electric heat coils
(5kW Size 8; 10kW Size 10) are activated to ensure the discharge air stays at a com-
fortable temperature.
FIGURE 19 shows the locations of the evaporator and condenser coils and their ther-
mostatic expansion and check valves. The system is factory charged with environmen-
tally friendly R-410A refrigerant ( Size 8 - 6.5 lbs and Size 12 - 13 lbs).
7.4.3 Heat Pump (cont’d)
7.4 Electrical Components (cont’d)
7.4.4 Optional Electric
Preheat, PH1A (5kW)
and PH2A (10kW)
FIGURE 20 - Location of Optional Electric Heating Elements
Model ZQYRA Size 8 with Option PH1A
(one heating element)
Model ZQYRA Size 12 with Option PH2A
(two heating elements)
If ordered with optional electric preheat, electric elements will be installed in the cabinet
between the inlet hood and the energy recovery wheel. Optional electric preheat pro-
vides frost protection for the wheel in extremely cold temperatures. For more detailed
information on controls, see “Optional Preheat Control” in Paragraph 8.2.
Check the unit rating plate for the MCA and MOP of a unit with optional electric preheat.
NOTES: Both Model Sizes 8 and 12 could have either Option PH1A (5kW) or PH2A (10kW). If it is determined after
installation that electric preheat is needed, contact your distributor about field installing heating elements.
There are five wall-mounted control options that require field installation and wiring.
Follow the manufacturer’s instructions for installation. Refer to Paragraph 7.5.2 for
more detailed information about wiring and operation for each control option.
7.5.1 Control Wiring General Requirements 7.5 Control Wiring
(field-installed)