Lennox SW 036, Руководство по установке

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Page 24
TABLE 8
SW 120 CAV MANUFACTURER'S NUMBERS
Drive No.
DRIVE COMPONENTS
ADJUSTABLE SHEAVE FIXED SHEAVE BELTS
Supplier No. OEM Part No. Supplier No. OEM Part No. Supplier No. OEM Part No.
1 1VP40 X 7/8 79J0301 BK77 X 1 49K4001 BX57 78L5301
TABLE 9
SW 240 CAV MANUFACTURER'S NUMBERS
Drive
No.
DRIVE COMPONENTS
ADJUSTABLE SHEAVE FIXED SHEAVE BELTS SPLIT BUSHING
Supplier No. OEM Part No. Supplier No. OEM Part No. Supplier No. OEM Part No. Supplier No. OEM Part No.
2 1VP44 X 1-1/8 100239-07 BK110H 100788-06 BX68 88K3401 H-1-7/16 49M6201
Cooling Start-Up
IMPORTANT-The crankcase heater must be energized for
24 hours before attempting to start compressor. Set
thermostat so there is no demand to prevent compressors
from cycling.
A-Preliminary Checks
1- Make sure that 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.
3- Check to ensure that refrigerant lines do not rub against
the cabinet or against other refrigerant lines.
4- Check voltage at disconnect switch. Voltage must be
within range listed on nameplate. If not, consult
power company and have voltage condition
corrected before starting unit.
5- Make sure filters are in place before start‐up.
6- Make sure the three-way manual valves are in the
main loop position. If not, refer to Bleed Air From Water
Lines section to place valves in main loop position.
B-Start-Up
1- Initiate first and second cooling demand according to
instructions provided with thermostat.
2- 036 & 060 Units-
First-stage thermostat demand will energize
compressor 1. 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.
The water flow control valve is energized open when
compressor 1 starts. Water is allowed to flow through
the water-to-refrigerant coil.
120 & 240 Units-
First-stage thermostat demand will energize
compressor 1. Second-stage thermostat demand will
energize compressor 2. 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.
The B39 stage 1 water flow control valve opens when
compressor 1 starts. B42 stage 2 flow control valve
opens when compressor 2 starts. When flow control
valves open, water flows to the appropriate section of
the water-to-refrigerant coil.
3- 120 and 240 units contain two refrigerant circuits and
two stages of cooling. See figure 25.
4- Each refrigerant circuit is separately charged with
R410A refrigerant. See unit nameplate for correct
amount of charge.
5- See the following figures for refrigerant circuit routing:
3, 5, & 10 Ton Units Cooling Mode Figure 26
20 Ton Units Cooling Mode Figure 27
3, 5, & 10 Ton Units Heating Mode Figure 28
20 Ton Units Heating Mode Figure 29
6- Refer to Cooling Operation and Adjustment section for
proper method to check refrigerant charge.
EVAPORATOR COIL
FIGURE 25
120 AND 240 TON REFRIGERANT CIRCUITS
COMPRES­
SORS