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II−PLACEMENT AND INSTALLATION
Make sure the unit is installed in accordance with the
installation instructions and all applicable codes. See
accessories section for conditions requiring use of the
optional roof mounting frame (T1CURB).
III−START UP − OPERATION
Refer to startup directions and refer closely to the unit wir-
ing diagram when servicing. See unit nameplate for mini-
mum circuit ampacity and maximum fuse size.
A−Preliminary and Seasonal Checks
1− Make sure the unit is installed in accordance with the
installation instructions and applicable codes.
2− Inspect all electrical wiring, both field and factory installed
for loose connections. Tighten as required. Refer to unit
diagram located on inside of unit control box cover.
3− Check to ensure that refrigerant lines are in good
condition and do not rub against the cabinet or other
refrigerant lines.
4− Check voltage at the disconnect switch. Voltage must
be within the range listed on the nameplate. If not,
consult the power company and have the voltage cor-
rected before starting the unit.
5− Recheck voltage and amp draw with unit running. If
voltage is not within range listed on unit nameplate,
stop unit and consult power company. Refer to unit
nameplate for maximum rated load amps.
6− Inspect and adjust blower belt (see section on Blower
Compartment − Blower Belt Adjustment).
B−Heating Start Up
1− Set thermostat or temperature control device to initiate
a first−stage heating demand.
A first−stage heating demand (W1) will energize com-
pressor 1 and the outdoor fan.
Note − L1 reversing valve is de−energized in the heating
mode.
KHA Units With Optional Electric Heat −
An increased heating demand (W2) will energize elec-
tric heat. Electric heat is also energized during the de-
frost cycle to maintain discharge air temperature.
C−Cooling Start Up
IMPORTANT
If unit is equipped with a crankcase heater. Make sure
heater is energized 24 hours before unit start−up to
prevent compressor damage as a result of slugging.
1− Set thermostat or temperature control device fan
switch to
AUTO
or
ON.
Set thermostat or temperature
control device to initiate a first−stage cooling demand.
A Y1 cooling demand will energize L1 reversing valve
and the compressor.
Units With Optional Economizer
−
The optional economizer will start on a Y1 cooling de-
mand when outdoor air enthalpy is suitable.
2− Refrigerant circuits are factory charged with R−410A
refrigerant. See unit rating plate for correct amount of
charge.
Three Phase Scroll Compressor Voltage Phasing
Three phase scroll compressors must be phased se-
quentially to ensure correct compressor and blower rota-
tion and operation. Compressor and blower are wired in
phase at the factory. Power wires are color−coded as fol-
lows: line 1−red, line 2−yellow, line 3−blue.
1− Observe suction and discharge pressures and blower
rotation on unit start−up.
2− Suction pressure must drop, discharge pressure must
rise and blower rotation must match rotation marking.
If pressure differential is not observed or blower rotation is
not correct:
3− Disconnect all remote electrical power supplies.
4− Reverse any two field−installed wires connected to the
line side of K1 contactor. Do not reverse wires at blow-
er contactor.
Make sure the connections are tight.
Discharge and suction pressures should operate at their
normal start-up ranges.
Summary of Contents for KHA SERIES
Page 41: ...Page 41 KHA036 048 060 Y Voltage 1 2 5 9 3 11 6 7 8 4 4 5 5 8 9 9 10...
Page 42: ...Page 42 KHA036 048 060 G J Voltage 1 2 5 9 3 11 6 7 8 4 4 5 5 7 9 9 10 11...
Page 46: ...Page 46 T1EH 7 5 10 15 22 5 kW P VOLTAGE 1 3 4 5 6 7 2 4 4 4 7 7 7...
Page 47: ...Page 47 T1EHA 7 5 15 22 5kW Y VOLTAGE KHA SERIES UNITS 1 3 4 5 6 7 2 4 7...
Page 48: ...Page 48 T1EHA 7 5 15 22 5kW G J VOLTAGE KHA SERIES UNITS 1 3 4 5 6 7 2 4 7...
