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7
Electrical Wiring
Electrical Data
- All wiring must comply with local electrical code requirement. All 50BY, BL units are completely
wired internally at factory for voltage shown on the nameplate. Check the available power supply with the
nameplate information. Voltage at the unit, with the unit operating must be within
±
10% of the voltage indicated
on the nameplate. Voltage between phases must be balanced within 3% and current within 10% with compressor
running.
Power Supply Wiring
- Conduit opening for all units is on left-hand side of unit near control box. Connect
power wires from field-supplied disconnect switch to terminals on TB1 in the control box. Also, connect ground
leads to "Earth Terminal" in the control box.
Control Wiring
- The control circuit is factory wired for 230-volt usage if 400-3-50 main power is supplied with
additional neutral wire. Refer to fig. For field control wiring to pump contactor and room thermostat.
Start-Up
Before Initial Start-Up
- Crankcase heater must have been energized at least 24 hours before starting unit.
Confirm that the following steps have been completed.
1. Compressor hold-down bolts must be snug but not tight.
2. Backseat (open) compressor discharge service valve.
3. Open liquid line shut off valve.
4. Water piping system must be properly installed and filled with clean water.
5. Confirm that all electrical wiring connections are correct and tight. Supply voltage must be
±
10% of unit
nameplate rating and phase imbalance must not exceed 3 percent.
6. Compressor oil should be visible in sight glass. (On units)
7. Check moisture and liquid indicator located ahead of thermal expansion valve. This indicator must be full of
liquid refrigerant properly indicate the moisture content of the refrigerant. The center green part indicates a
dry system.
To Start Unit:
1. Set unit selector switch at "COOL".
2. Turn on unit power switch. Check that crankcase heater is on. (Eergize crankcase heater for 48 hours
before starting compressor.)
3. Turn on condenser water supply.
4. On unit 008 thru 040, turn the rotary switch (RS) to "FAN" position. On units 050 thru 080, press "ON"
button of FAN switch located on switch panel. Check the fan for direction of rotation.
5. (Assume room thermostat is calling for full cooling capacity.)
On units 008 thru 040, turn the rotary switch to "RUN" position. On units 050 thru 080, press "ON" button of
COMPR switch on the switch panel. Compressor will start immediately. On 50BL050, 060 and 080, the start of
compressor No. 2 will be delayed for 60 seconds.
Summary of Contents for 50BL Series
Page 1: ... Ÿà Õ µ µ Èß ËÕߪ Õ å Single Package Cooling Units 50BY BL 50BY BL 50BY BL ...
Page 2: ......
Page 13: ... Ÿà Õ µ µ Èß ËÕߪ Õ å 13 Technical Specification ...
Page 14: ... Ÿà Õ µ µ Èß ËÕߪ Õ å 14 Unit Dimensions 50BY008 010 50BY015 020 ...
Page 15: ... Ÿà Õ µ µ Èß ËÕߪ Õ å 15 Unit Dimensions 50BY025 030 50BY040 ...
Page 17: ... Ÿà Õ µ µ Èß ËÕߪ Õ å 17 Electrical Wiring Diagrams ...
Page 18: ... Ÿà Õ µ µ Èß ËÕߪ Õ å 18 Electrical Wiring Diagrams ...
Page 19: ... Ÿà Õ µ µ Èß ËÕߪ Õ å 19 Electrical Wiring Diagrams ...
Page 20: ... Ÿà Õ µ µ Èß ËÕߪ Õ å 20 Electrical Wiring Diagrams ...
Page 21: ... Ÿà Õ µ µ Èß ËÕߪ Õ å 21 Electrical Wiring Diagrams ...
Page 22: ... Ÿà Õ µ µ Èß ËÕߪ Õ å 22 Notes ...
Page 23: ......