Lennox LCH036 Installation Instructions Manual page 110

IMPORTANT
Three Phase Scroll Compressor Voltage Phasing
Three phase scroll compressors must be phased se­
quentially to ensure correct compressor and blower*
rotation and operation. Compressor and blower are
wired in phase at the factory. Power wires are color-
coded as follows: line 1-red, line 2-yellow, line 3-blue.
1-Observe suction and discharge pressures and blow­
er* 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* rota­
tion is not correct:
3-Disconnect all remote electrical power supplies.
4-Reverse any two field-installed wires connected to
the line side of S48 disconnect or TB13 terminal strip.
Do not reverse wires at blower contactor.
5-Make sure the connections are tight.
Discharge and suction pressures should operate at
their normal start‐up ranges.
*Supply air VFD motors should rotate in the correct di­
rection; verify scroll compressor rotation separately.
Contact technical support if the VFD blower is rotating
incorrectly.
CAV UNITS:
TO INCREASE CFM
LOOSEN ALLEN SCREW &
TURN PULLEY CLOCKWISE
TO DECREASE CFM
TURN PULLEY
COUNTERCLOCKWISE
SIDE VIEW
MOTOR
ALLEN
SCREW
PULLEY
TO INCREASE BELT TENSION
1-Loosen four screws securing blower motor to
sliding base.
2-Turn adjusting front and rear tension adjusting
screws to the right, or clockwise, to move the
motor upward and tighten the belt.
3-Tighten four screws.
Units Equipped With Optional VFD or Voltage or
Phase Detection - The Unit Controller checks the
incoming power during start-up. If the voltage or phase is
incorrect, the Unit Controller will display an alarm and the
unit will not start. Refer to the Unit Controller manual for
details.
A-Blower Operation
Initiate blower only (G) demand at thermostat according
to instructions provided with thermostat. Unit will cycle on
thermostat demand. The following steps apply to
applications
thermostat.
B-Blower Access
BLOWER ASSEMBLY
LOOSEN SCREWS TO
ADJUST BELT TENSION
BLOWER
ASSEMBLY
SLIDING BASE
FIGURE 14
Page 10
using a
1- Blower operation is manually set at the thermostat
subbase fan switch. With fan switch in ON position,
blowers will operate continuously.
2- With fan switch in AUTO position, the blowers will
cycle with demand. Blowers and entire unit will be off
when system switch is in OFF position.
1- Disconnect blower harness at K3 contactor (CAV) or
A96 inverter (VAV). Failure to do so could damage
harness or components.
2- Remove screws on either side of blower assembly
sliding base. See figure 14.
3- Pull base toward outside of unit.
BELT TENSION
ADJUSTING SCREWS
BLOWER
MOTOR
PULLEY
REMOVE SCREWS TO SLIDE
BLOWER ASSEMBLY OUT OF UNIT
typical electro-mechanical
ALLEN
SCREW
LOOSEN FOUR
SCREWS TO ADJUST
BELT TENSION