Goodman Mfg IO-367B User Manual

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3. Use #18 AWG wire for 24V control wiring runs not

exceeding 75 feet. Use #16 AWG wire for 24V control
wiring runs not exceeding 125 feet. Use #14 AWG
wire for 24V control wiring runs not exceeding 200
feet. Low voltage wiring may be National Electrical
Code (NEC) Class 2 where permitted by local codes.

4. Route thermostat wires from sub-base terminals to

the unit. Control wiring should enter through the duct
panel (dimple marks entrance location). Connect
thermostat and any accessory wiring to low voltage
terminal block TB1 in the main control box.

NOTE: Field-supplied conduit may need to be installed
depending on unit/curb configuration. Use #18 AWG solid
conductor wire whenever  connecting thermostat wires to
terminals on sub-base. DO NOT use larger than #18 AWG
wire. A transition to #18 AWG wire may be required before
entering thermostat sub-base.

Red

R (24V)

Green

G (Fan)

Orange

O (Rev.  Valve)

White

W1 (Heat, 2nd)*

Yellow

Y1 (Low Cool)

Purple

Y2 (High Cool)

C (Blue)

C (Common)

*Optional field installed heat connections

The supply duct from the unit through a wall may be installed
without clearance. However, minimum unit clearances must
be maintained (see “Clearances” section).  The supply duct
should be provided with an access panel large enough to
inspect the air chamber downstream of the heat exchanger.
A cover should be tightly attached to prevent air leaks.

Ductwork dimensions are shown in the roof curb installation
manual.

If desired, supply and return duct connections to the unit may
be made with flexible connections to reduce possible unit
operating sound transmission.

A 3/4” NPT drain connection is supplied for condensate pip-
ing.  An external trap must be installed for proper condensate
drainage.

UNIT

2" MINIMUM

FLEXIBLE
TUBING-HOSE
OR PIPE

3" MINIMUM

A POSITIVE LIQUID
SEAL IS REQUIRED

Install condensate drain trap as shown. Use 3/4" drain line
and fittings or larger. Do not operate without trap.

Drainage of condensate directly onto the roof may be ac-
ceptable; refer to local code. It is recommended that a small
drip pad of either stone, mortar, wood or metal be provided to
prevent any possible damage to the roof.

Due to the fact that drain pans in any air conditioning unit
will have some moisture in them, algae and fungus will grow
due to airborne bacteria and spores. Periodic cleaning is
necessary to prevent this build-up from plugging the drain.