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GHFC-74 2-1/8” O.D. GHFC-264 2-5/8” O.D.

GHFC-84 2-5/8” O.D. GHFC-281 2-5/8” O.D.

GHFC-99 2-5/8” O.D. GHFC-310 2-5/8” O.D.

GHFC-106 2-1/8” O.D. GHFC-352 2-5/8” O.D.

Models GHFC-200 and larger are double-wide units. Although the header connection for

each section is 2-5/8”, each unit comes with a factory provided header manifold kit with

3-1/8”eldconnections.

2.3 Auxiliary Chilled Water/Energy Saver Coil Piping

Units with Auxiliary Chilled Water cooling coil require a separate source of chilled water. These

chilled water connection sizes will be equal to the condenser water connection sizes on the chart in

Section 2.2.2. Units with an Energy Saver cooling coil have shared piping with the condenser sup-

ply and therefore do not require a separate water source.

All chilled water pipes have a cap installed on the end of the pipe for factory pressure testing of the

system. These caps need to be removed before installing the water piping to the unit. Use a tube

cutter for smaller pipes and reciprocating saw with a metal cutting blade for larger pipes or if there is

a clearance problem. All connections need to be cleaned before connections are brazed together.

2.4 Condensate Drain Piping

Every indoor unit has a 3/4” copper stub provided for condensate removal. A union is recommended

attheeldconnectionwhichwillpermiteasydisconnectionfromtheunitforcleaning.

A trap should be built into the drain line to prevent air from backing up into the unit. Drain lines

should be pitched downward not less than 1/4” for each ten feet of horizontal run. Do not reduce

the size of the drain line.

Some applications have no convenient means of allowing a gravity drain. When required, a con-

densate pump can be used. Condensate pumps are either factory mounted or shipped loose. Fac-

tory mounted condensate pumps do not require a separate power source.

Condensatepumps shipped loose (or eldprovided)typicallyrequireadedicated 110 volt power

source. Field pipe connections must be made to the pump discharge connection. A check valve

must be installed to prevent short cycling. See condensate pump electrical requirements in Section

3.9.

2.5 Humidier Piping

2.5.1 Steam Generator Humidier

ThestandardhumidierongForcesystemsisasteamgeneratortypewithdisposablecylinder.The

humidiermakeupwatershouldbebroughttothehumidierthroughtheeldconnectionopening

using1/4”coppertubing.Acompressionttingisprovidedatthehumidier.

A shutoff valve should be provided outside the air conditioner to allow disconnection for service.

An in-line water pressure regulator and strainer should be installed. Water pressure should be set

between 20 and 80 PSI.

Data Aire gForce GT series User Manual

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