Heating Start-Up; Cooling Start-Up - Lennox KHC092 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

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
compressors 1 and 2. Both outdoor fans are
energized with a W1 demand.
Note - L1 and L2 reversing valves are de-energized in the
heating mode.
Units With Optional Electric Heat -
An increased heating demand (W2) will energize
electric heat. Electric heat is also energized during
the defrost cycle (W1) to maintain discharge air
temperature.

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-Start-Up
Supply Air Inverter Units - Refer to the Inverter
Start-Up section for further instruction on blower
control. See table 12 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 4 for cooling operation.
Units Equipped With Economizer -
When outdoor air is suitable, any combination of
thermostat demands will energize the economizer.
See table 5 for cooling operation.
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 14
DRIVE COMPONENTS
FIXED SHEAVE
OEM PART NO.
100244-20
31K6801
100244-17
100244-21
37L4701
12L2501
49K4001
100244-24
100244-23
2- Refrigerant circuits are factory charged with
HCFC-410A refrigerant. See unit rating plate for
correct amount of charge.
3- Units contain two refrigerant circuits or systems. See
figure 14.
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
COOLING OPERATION - WITH ECONOMIZER
T'Stat
Y1
Y1 + Y2
Y1 + Y2 + Y3
REFRIGERANT STAGES - TWO FANS
Y1 Demand =Outdoor Fan 1 Energized
Y2 Demand =Outdoor Fans 1 & 2 Energized
INDOOR COIL
STAGES 1 & 2
INTERTWINED
2
BELT
BROWNING NO. OEM PART NO.
AX54
AX55
AX52
AX58
AX58
AX57
BX59
BX57
BX56
TABLE 4
Compressors
TABLE 5
Compressors
Off Off
Compr. 1 Low Fan 1 On
Compr. 1 High Fan 1 On
OUTDOOR COIL
OUTDOOR
STAGE 2
FAN 1
B4
B5
1
FIGURE 14
100245-25
100245-26
100245-33
100245-34
100245-34
100245-28
59A5001
78L5301
100245-11
OD Fans
Fan 1 On
Both On
Both On
OD Fans
OUTDOOR
FAN 2
OUTDOOR COIL
STAGE 1