Cooling Start-Up - Lennox KGC092 Installation Instructions Manual

DRIVE
ADJUSTABLE SHEAVE
NO.
BROWNING NO.
1 1VP34x7/8
2 1VP40x7/8
3 1VP34x7/8
4 1VP44x7/8
5 1VP50x7/8
6 1VP50x7/8
10 1VP50x1-1/8
11 1VP50x1-1/8
12 1VP50x1-1/8

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.
A-Operation
Supply Air Inverter Units - Refer to the Inverter
Start-Up section for further instruction on blower
control. See table 18 for full details on unit operation.
Compressor 1 is a two-stage compressor. Compressor 2
is a single-stage compressor.
1- Initiate first, second, and third stage cooling demands
according to instructions provided with thermostat.
2- No Economizer Installed in Unit -
See table 5 for cooling operation.
Units Equipped With Economizer -
When outdoor air is suitable, any combination of
thermostat demands will energize the economizer.
See table 6 for cooling operation.
TABLE 5
COOLING OPERATION - NO ECONOMIZER
T'Stat
Y1 Compr. 1 Low
Y1 + Y2 Compr. 1 Low; Compr. 2 On
Y1 + Y2 + Y3 Compr. 1 High; Compr. 2 On
TABLE 6
COOLING OPERATION - WITH ECONOMIZER
T'Stat Compressors
Y1 Off
Y1 + Y2 Compr. 1 Low
Y1 + Y2 + Y3 Compr. 1 High
MANUFACTURER'S NUMBERS
OEM PART NO.
31K6901
79J0301
31K6901
53J9601
98J0001
98J0001
P-8-1977
P-8-1977
P-8-1977
Compressors OD Fans
Both On
Both On
Both On
OD Fans
Off
Both On
Both On
TABLE 4
DRIVE COMPONENTS
FIXED SHEAVE
BROWNING NO. OEM PART NO.
AK61x1 100244-20
AK59x1 31K6801
AK46x1 100244-17
AK74x1 100244-21
AK69x1 37L4701
AK64x1 12L2501
BK77x1 49K4001
BK67x1 100244-24
BK62x1 100244-23
3- Units contain two refrigerant circuits or stages. See
figure 18 or 19.
4- Each refrigerant circuit is separately charged with
R-410A refrigerant. See unit rating plate for correct
amount of charge.
5- Refer to Cooling Operation and Adjustment section for
proper method to check refrigerant charge.
REFRIGERANT STAGES - 092, 102, 120, 150
CONDENSER COIL
KG/KC 092, 102 - Stage 2
KG/KC 120, 150 - Stage 1
EVAPORATOR
COIL STAGE 2
Page 18
BELT
BROWNING NO.
AX54
AX55
AX52
AX58
AX58
AX57
BX59
BX57
BX56
CONDENSER COIL
KG/KC 092, 102 - Stage 1
KG/KC 120, 150 - Stage 2
(BOTH FANS ARE ENERGIZED
WITH A Y1 DEMAND)
2
1
FIGURE 18
OEM PART NO.
100245-25
100245-26
100245-33
100245-34
100245-34
100245-28
59A5001
78L5301
100245-11
EVAPORATOR
COIL STAGE 1