McQuay MHW Geothermal Ran Manual de instalación descargar pdf (Pagina 11)

IM 985-2 / Page 11 of 38

Motorized Isolation Valve

The2-waymotorizedvalvekitisavailableasafactory-in-

stalled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

Actuator &

Valve Assembly

Anti-short Bushing

Connector

Conduit

Pin(s), female

connect to terminal H8

Connector

Anti-short

Bushing

Notes: 1. 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.

2. 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.

Table 2: Antifreeze Correction Factors

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 0.9910 0.9510 – – –

Heating Capacity 0.9950 0.9600 – – –

Pressure Drop 1.0350 0.9600 – – –

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

Ethylene Glycol

Propylene Glycol

Methanol

Ethanol

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 37 38

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McQuay MHW Geothermal Ran Manual de instalación Pagina 11

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