6
18-GF74D1-1R-EN
Negative
Pressure
Blower
Running
Drain Pan
“C”
“A”
To Drain
Proper operation of condensate trap under
normal operating conditions.
“A” height of water column equals
negative static pressure existing in system.
“C” dimension should at least equal two
times the maximum negative static pressure
that can occur in system.
Do not reduce the drain line size less than the
connection size on the drain pan. Condensate
should be piped to an open drain or to the outside.
All drains must pitch downward away from the unit
a minimum of 1/4" per foot of line to ensure proper
drainage.
IImmppoorrttaanntt:: If cleanout Tee is used, stand pipe must
be sealed/capped.
IImmppoorrttaanntt:: If a vent Tee is used, it must be
downstream from the trap.
To Drain
Vent
-This vent pipe MUST
terminate above the
dotted line
Cleanout
(with Cap)
Cleanout
(Plug)
Insulate the primary drain line to prevent sweating
where dew point temperatures may be met.
(Insulation is optional depending on climate and
application needs.)
5. RReeffrriiggeerraanntt PPiippiinngg
Refrigerant piping external to the unit shall be sized
in accordance with the instructions of the
manufacturer of the outdoor equipment.
6. MMeetteerriinngg DDeevviiccee
All units are shipped and installed with an
internally-checked, non-bleed TXV designed for air
conditioning or heat pump operation. Some
outdoor models may require a start assist kit. See
outdoor unit for more information.
7. BBlloowweerr
This unit is supplied with a variable speed motor
with a direct drive blower wheel which can obtain
various air flows. The unit is shipped with factory
set cooling and heating air flows. Performance
tables are available for additional airflow settings.
Disconnect all power to the unit before making any
adjustments to the airflow settings. Be sure to
check the air flow and the temperature drop across
the evaporator coil to ensure sufficient air flow.
8. AAiirrffllooww AAddjjuussttmmeenntt
CCAAUUTTIIOONN
EEQQUUIIPPMMEENNTT DDAAMMAAGGEE!!
FFaaiilluurree ttoo ffoollllooww tthhiiss pprroocceedduurree mmaayy rreessuulltt iinn
eeqquuiippmmeenntt ddaammaaggee..
DDiissccoonnnneecctt ppoowweerr ttoo tthhee aaiirr hhaannddlleerr bbeeffoorree
cchhaannggiinngg ddiipp sswwiittcchh ppoossiittiioonnss..
Blower speed changes are made on the ECM Fan
Control. The ECM Fan Control controls the variable
speed motor.
There is a bank of 8 dip switches. The dip switches
work in pairs to match the airflow for the outdoor
unit size (tons). cooling airflow adjustment, Fan off-
delay options, and heating airflow adjustment. The
switches appear as shown in Figure 2, p. 7
Figure 1. ECM Fan Control
CFM
SELECTION
LIGHT
DIP
SWITCHES
FFeeaattuurreess
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