McQuay SEASONCON ALP-037A, Manual, Page: 9 / 43

HOT GAS BYPASS COMPONENTS REFRIGERANT CHARGE
McQuay offers a “Hot Gas Bypass Accessory Kit” for each
ALP unit size. Each kit includes a manual shut-off valve, a
solenoid valve, a hot gas bypass valve and an instruction
drawing. The kits for the ALP-089B thru 159B units do
not include a manual shut-off valve. These units must be
ordered with the manual shut-off valve factory installed.
Table 6 lists the ordering number and line sizes.
Each ALP condensing unit is designed for operation using
refrigerant 22. Table 7 lists approximate refrigerant charge
required and the condenser pumpdown capacity.
TABLE 6. HOT GAS BYPASS KITS
TABLE 7. APPROXIMATE REFRIGERANT CHARGE
057A-D
1
067B-D 3212628-01 1
078B-D 1
089B-D 321262B-02
1
106B-D
1
74 74 I
159B 9 0 9 0
FIELD WIRING
Wiring should be done in accordance with all applicable
codes and ordinances.
Warranty is voided if wiring is not in accordance with
specifications. An open fuse indicates a short, ground, or
All standard units require a 115 volt power supply for
the control circuit. If the optional control circuit trans-
former is ordered, the control circuit is powered off the
main unit power supply.
overload. Before replacing a fuse or restarting a compressor
or fan motor, the trouble must be found and corrected. Figures 9 and 10 show typical field wiring that is
Copper wire is required for all power lead terminations
required for unit installation. Items that require field wiring
are: liquid line solenoids
and optional hot gas
at the unit while either aluminum or copper can be used for bypass solenoid (SV5) and the cooling thermostat as well as
all other wiring. the unit power supply.
FIGURE 9. TYPICAL FIELD WIRING DIAGRAM (ALP-037A thru