Page 12
506393−01 11/2010
TABLE 2
MANUFACTURER’S NUMBERS
Drive
No.
H.P.
DRIVE COMPONENTS
RPM
ADJUSTABLE SHEAVE
FIXED SHEAVE
BELTS
SPLIT BUSHING
Min
Max
Supplier No.
OEM Part
No.
Supplier No.
OEM Part
No.
Supplier
No.
OEM Part
No.
Supplier
No.
OEM Part
No.
1
3
535
725
1VP40x7/8
79J0301
BK95X1−7/16
80K1601
BX59
59A5001
N/A
N/A
2
3
710
965
1VP40x7/8
79J0301
BK72x1-7/16
100244−13
BX56
63K0501
N/A
N/A
3
5
685
865
1VP50x1−1/8
P−8−1977
BK100x1-7/16
39L1301
BX61
93J9801
N/A
N/A
4
5
850
1045
1VP65x1−1/8
100239−03
BK110H
100788−06
BX65
100245−08
H−1−7/16
49M6201
5
5
945
1185
1VP60x1−1/8
41C1301
BK90H
100788−04
BX61
93J9801
H−1−7/16
49M6201
6
7.5
850
1045
1VP65x1−3/8
78M7101
BK110H
100788−06
BX66
97J5901
H−1−7/16
49M6201
7
7.5, 10
945
1185
1VP60x1−3/8
78L5501
BK90H
100788−04
BX63
97J5501
H−1−7/16
49M6201
8
7.5
1045
1285
1VP65x1−3/8
78M7101
BK90H
100788−04
BX64
97J5801
H−1−7/16
49M6201
10
10
1045
1285
1VP65x1−3/8
78M7101
1B5V86
78M8301
5VX670
100245−21
B−1−7/16
100246−01
11
10
1135
1365
1VP65x1−3/8
78M7101
1B5V80
100240−05
5VX660
100245−20
B−1−7/16
100246−01
Cooling Start−Up
A−Start−Up
1− Remove coil covers before starting unit.
2− Set thermostat or temperature control device fan
switch to
AUTO
or
ON.
Set thermostat or temperature
control device to initiate a first−stage cooling demand.
A first−stage (Y1) cooling demand will energize
compressor 1 and outdoor fans 1 & 2. An increased
cooling demand (Y2) will initiate compressor 2 and
outdoor fans 3 & 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 compressor 1
and outdoor fans 1 & 2.
3− Refrigerant circuits are factory charged with R−410A
refrigerant. See unit rating plate for correct amount of
charge.
4− Units contain two refrigerant circuits or systems. See
figure 8.
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:
BLOWER
INDOOR COIL
BLOWER
180 & 240 REFRIGERANT CIRCUITS
FIGURE 8
COMPRESSOR 1
COMPRESSOR 2
OUTDOOR
COIL 2
COND.
FAN 1
COND.
FAN 2
COND.
FAN 4
COND.
FAN 3
OUTDOOR COIL 1
1− Attach gauge manifolds and operate unit in cooling
mode with economizer disabled until system
stabilizes (approximately five minutes). Make sure all
outdoor air dampers are closed.
2− Check each system separately with all stages
operating.
3− Use a thermometer to accurately measure the
outdoor ambient temperature.
4− Apply the outdoor temperature to table 3 or 4 to
determine normal operating pressures. Pressures
are listed for sea level applications at 80
F dry bulb
and 67
F wet bulb return air.
5− Compare the normal operating pressures to the
pressures obtained from the gauges. Minor
variations in these pressures may be expected due to
