Cooling Start-Up - Lennox LCH036 Installation Instructions Manual

ADJUSTABLE SHEAVE
Drive
No.
OEM Part
Supplier No.
1 1VP71x1-3/8 100239-06
2 1VP71x1-1/8 100239-06
3 1VP65x1-3/8 78M7101
4 1VP60x1-3/8 78L5501
5 1VP56x1-1/8 P-8-1492
6 1VP60x1-1/8 41C1301
7 1VP50x1-1/8 P-8-1977
8 1VP44x1-1/8 36C0701
9 1VP44x1-1/8 36C0701

Cooling Start-Up

IMPORTANT-The crankcase heater must be energized for
24 hours before attempting to start compressor. Set
thermostat so there is no demand to prevent compressors
from cycling.
VFD Units - The blower rotation will always be correct on
VFD units. Checking blower rotation is not a valid method
of determining voltage phasing for incoming power.
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.
MANUFACTURER'S NUMBERS (60 HZ)
FIXED SHEAVE
Supplier OEM Part
No. No. No.
BK140H 100788-13
BK120H 100788-07
BK130H 100788-08
BK110H 100788-06
BK120H 100788-07
BK110H 100788-06
BK120H 100788-07
BK120H 100788-07
BK140H 100788-13
TABLE 4
DRIVE COMPONENTS
BELTS BELTS W/ TENSIONER
Supplier OEM Part Supplier
No. No. No.
BX78 100245-44 BX77
BX75 31K9801 BX73
BX75 31K9801 BX74
BX71 31K9701 BX71
BX71 31K9701 BX71
BX70 31K9601 BX70
BX70 31K9601 BX70
BX70 31K9601 BX70
BX73 100245-41 BX72
VFD Units and Units Equipped With Optional 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-Preliminary Checks
1- Make sure that 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.
3- Check to ensure that refrigerant lines do not rub against
the cabinet or against other refrigerant lines.
4- Check voltage at disconnect switch. Voltage must be
within range listed on nameplate. If not, consult
power company and have voltage condition
corrected before starting unit.
5- Make sure filters are in place before start‐up.
B-Start-Up
VFD Units - Refer to the Optional VFD Start-Up section.
1- Initiate first and second stage cooling demands
according to instructions provided with thermostat.
2- First-stage thermostat demand will energize
compressors 1 and 2. Second-stage thermostat
demand will energize compressors 3 and 4. On
units with an economizer, when outdoor air is
acceptable, a first-stage demand will energize the
economizer; a second-stage demand will energize
compressors 1 and 2.
3- Units contain four refrigerant circuits or systems.
Evaporator and condenser coil refrigerant circuits 1
and 2 make up stage 1 cooling. Evaporator and
condenser refrigerant circuits 3 and 4 make up stage
2 cooling. See figure 20 or 21.
Page 15
SPLIT BUSHING
OEM Part
Supplier No.
No.
100245-43 H - 1-7/16
100245-41 H - 1-7/16
100245-42 H - 1-7/16
31K9701 H - 1-7/16
31K9701 H - 1-7/16
31K9601 H - 1-7/16
31K9601 H - 1-7/16
31K9601 H - 1-7/16
100245-14 H - 1-7/16
OEM Part
No.
49M6201
49M6201
49M6201
49M6201
49M6201
49M6201
49M6201
49M6201
49M6201