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TABLE 2
MANUFACTURER'S NUMBERS
DRIVE
NO.
DRIVE COMPONENTS
ADJUSTABLE SHEAVE
FIXED SHEAVE
BELT
BROWNING NO.
OEM PART NO.
BROWNING NO.
OEM PART NO.
BROWNING NO.
OEM PART NO.
1
1VP34x7/8
31K6901
AK61x1
100244-20
A44
44L5501
2
1VP40x7/8
79J0301
AK59x1
31K6801
AX45
100245-23
3
1VP34x7/8
31K6901
AK46x1
100244-17
A41
100245-18
4
1VP44x7/8
P-8-1488
AK74x1
100244-21
AX48
100245-50
5
1VP50x7/8
P-8-2187
AK69x1
37L4701
AX48
100245-50
6
1VP50x7/8
P-8-2187
AK64x1
12L2501
AX46
31K7101
10
1VP50x1-1/8
P-8-1977
BK77x1
49K4001
BX50
100245-49
11
1VP50x1-1/8
P-8-1977
BK67x1
100244-24
BX46
100245-48
12
1VP50x1-1/8
P-8-1977
BK62x1
100244-23
BX46
100245-48
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.
KHA 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
A-Operation
Supply Air Inverter Units - Refer to the Supply Air
Inverter Start-Up section.
1- Initiate first and second stage cooling demands
according to instructions provided with thermostat.
2-
No Economizer Installed in Unit -
A first-stage cooling demand (Y1) will energize
compressor 1 and both condenser fans. An
increased cooling demand (Y2) will energize
compressor 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
outdoor air is not acceptable unit will operate as
though no economizer is installed.
3- Units contain two refrigerant circuits or stages. See
figure 10.
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 - Fin/Tube Coil
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:
FIGURE 10
REFRIGERANT STAGES
(BOTH FANS ARE ENERGIZED
WITH A Y1 DEMAND)
INDOOR
COIL
STAGE 1
2
1
INDOOR
COIL
STAGE 2
OUTDOOR
COIL
STAGE 1
OUTDOOR
COIL
STAGE 2
OUTDOOR
FAN 1 (B4)
OUTDOOR
FAN 2 (B5)
