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TABLE 3
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
II-PLACEMENT AND INSTALLATION
Make sure the unit is installed in accordance with the
installation instructions and all applicable codes. See
accessories section for conditions requiring use of the
optional roof mounting frame (Z1CURB40B,
Z1CURB41B, Z1CURB42B, or Z1CURB43B).
III-STARTUP - OPERATION
A-Preliminary and Seasonal Checks
1- Make sure the unit is installed in accordance with the
installation instructions and applicable codes.
2- Inspect all electrical wiring, both field and factory
installed for loose connections. Tighten as required.
Refer to unit diagram located on inside of unit compres
sor access panel.
3- Check to ensure that refrigerant lines are in good
condition and do not rub against the cabinet or other
refrigerant lines.
4- Check voltage at the disconnect switch. Voltage must
be within the range listed on the nameplate. If not, con
sult the power company and have the voltage cor
rected before starting the unit.
5- Recheck voltage and amp draw with unit running. If
voltage is not within range listed on unit nameplate,
stop unit and consult power company. Refer to unit
nameplate for maximum rated load amps.
6- Inspect and adjust blower belt (see section on Blower
Compartment - Blower Belt Adjustment).
B-Heating Startup
1- Set thermostat or temperature control device to initiate
a first-stage heating demand.
A first-stage heating demand (W1) will energize com
pressors 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 elec
tric heat. Electric heat is also energized during the de
frost cycle (W1) to maintain discharge air temperature.
C-Cooling Startup
A-Operation
Supply Air Inverter Units - Refer to the Supply Air Invert
er Start-Up section.
1- Initiate first and second stage cooling demands ac
cording to instructions provided with thermostat.
2-
No Economizer Installed in Unit -
A first-stage cooling demand (Y1) will energize com
pressor 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 in
creased cooling demand (Y2) will energize com
pressor 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 fig
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.
