McQuay MHC Standard Range User Manual

Page 10 of 36 / IM 985-1
Motorized Isolation Valve
The 2-way motorized valve kit is available as a factory-
installedandwiredoptionormaybeorderedasaeld-
installed accessory.
Wired as shown in Figure 8, the motorized valve will open
on a call for compressor operation. Valves for unit sizes
007to018are1/2".
Figure 8 illustrates the wiring for a Normally Closed (NC),
power open motorized valve.
Figure 8. Normally Closed, Power Open Motorized Valve
Wiring
Note: Connectors on valve must be cut off and
stripped back and the wires twisted to make
connections to the H8 (IV/PR) terminals on the
MicroTech III controller.
Note: All plumbing connections are made the same,
whether or not the unit has valve packages. Plumbing
connections must conform with local piping and
building codes. The ability to remove the unit in order
to perform repairs is imperative.
Condensate Hose Connection
Eachunitissuppliedwitha3/4"(19mm)I.D.clearvinyl
condensate hose internally trapped within the chassis. The
hoseextends3½"(89mm)outofthechassiswithinthe
pipingcompartmenttoreachtheoororthebackwall.
Fieldcondensatepipingmustenterwithintheconnesof
thecabinet(backwalloroor)similartothesupplyand
return piping. Slide the vinyl hose over the condensate
pipe and clamp it.
10% 20% 30% 40% 50%
Cooling Capacity 0.9980 0.9720 – – –
Heating Capacity 0.9950 0.9700 – – –
Pressure Drop 1.0230 1.0570 – – –
10% 20% 30% 40% 50%
Cooling Capacity 0.9900 0.9800 0.9700 0.9600 0.9500
Heating Capacity 0.9870 0.9750 0.9620 0.9420 0.9300
Pressure Drop 1.0700 1.1500 1.2500 1.3700 1.4200
10% 20% 30% 40% 50%
Cooling Capacity 0.9950 0.9920 0.9870 0.9830 0.9790
Heating Capacity 0.9910 0.9820 0.9770 0.9690 0.9610
Pressure Drop 1.0700 1.1300 1.1800 1.2600 1.2800
Table 2. Antifreeze Correction Factors
Ethylene Glycol
Propylene Glycol
Methanol
Ethanol
10% 20% 30% 40% 50%
Cooling Capacity 0.9910 0.9510 – – –
Heating Capacity 0.9950 0.9600 – – –
Pressure Drop 1.0350 0.9600 – – –
Actuator &
Valve Assembly
Anti-short Bushing
Connector
Conduit
Pin(s), female
connect to terminal H8
Connector
Anti-short
Bushing

McQuay MHC Standard Range Specifications

General

Brand	McQuay
Model	MHC Standard Range
Category	Heat Pump
Language	English