Cooling Start-Up - Lennox KGA092 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.
1- Initiate first and second stage cooling demands
according to instructions provided with thermostat.
2- No Economizer Installed in Unit -
092, 102, 120 Units
A first-stage cooling demand (Y1) will energize
compressor 1 and both condenser fans. An
increased cooling demand (Y2) will energize
compressor 2.
150 Units
A first-stage cooling demand (Y1) will energize
compressor 1 and condenser fan 1. An increased
cooling demand (Y2) will energize compressor 2
and condenser fan 2.
Units Equipped With Economizer -
When outdoor air is acceptable, a first-stage
cooling demand (Y1) will energize the economizer.
An increased cooling demand (Y2) will energize
compressor 1 and both condenser fans. When
TABLE 3
MANUFACTURER'S NUMBERS
OEM PART NO. BROWNING NO.
31K6901 AK61x1
79J0301 AK59x1
31K6901 AK46x1
53J9601 AK74x1
98J0001 AK69x1
98J0001 AK64x1
P-8-1977 BK77x1
P-8-1977 BK67x1
P-8-1977 BK62x1
Page 18
DRIVE COMPONENTS
FIXED SHEAVE
OEM PART NO.
100244-20
31K6801
100244-17
100244-21
37L4701
12L2501
49K4001
100244-24
100244-23
outdoor air is not acceptable unit will operate as
though no economizer is installed.
3- Units contain two refrigerant circuits or stages. See
figure 17 or 18.
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.
B-Refrigerant Charge and Check
WARNING-Do not exceed nameplate charge under
any condition.
This unit is factory charged and should require no further
adjustment. If the system requires additional refrigerant,
reclaim the charge, evacuate the system, and add
required nameplate charge.
NOTE - System charging is not recommended below
60_F (15_C). In temperatures below 60_F (15_C), the
charge must be weighed into the system.
If weighing facilities are not available, or to check the
charge, use the following procedure:
IMPORTANT - Charge unit in standard cooling mode.
1- Make sure outdoor coil is clean. Attach gauge
manifolds and operate unit at full CFM in cooling mode
with economizer disabled until system stabilizes
(approximately five minutes). Make sure all outdoor air
dampers are closed.
BELT
BROWNING NO. OEM PART NO.
AX54 100245-25
AX55 100245-26
AX52 100245-33
AX58 100245-34
AX58 100245-34
AX57 100245-28
BX59 59A5001
BX57 78L5301
BX56 100245-11