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On the single compressor unit (015-040), part-wiring start is employed. On 50BL
To Shut Down Unit:
1. Turn rotary switch to "FAN" position (008-040)/ On units 050-080, push "OFF" button of COMPR. switch. All
compressors will stop.
2. Turn rotary switch to "OFF" position (008-040) or press "OFF" button of FAN switch 050-080. Indoor fans
will stop.
3. Turn off condenser water pump, if it is not interlocked with compressor.
Keep main power supply switch on.
Lockout Circuit
- When any one of safety devices (high and low pressure switches and compressor internal
protector) is open, the lockout circuit shuts compressor down and lights the warning light on. Turn rotary switch
to "OFF" position (008-040), or press "OFF" button of COMPR. switch. Check and correct the cause of trouble
and turn rotary switch back to "RUN" or press "ON" button again. Compressor will start if the cause is remedied.
The warning light will not come on when circuit breaker, condenser water pump, or outdoor fan is off.
The indoor fan overload is of manual reset type. When the overload is open, turn unit off. After checking and
correcting the cause, follow the start up procedure again.
Fusible Plug
- Installed on each water-cooled condenser on 50BY, BL units. Fusible plugs blow off at 72 ÌC,
discharge refrigerant to the atmosphere and relieve the head pressure.
Maintenance and Service
Shut off unit power supply
Cleaning
- The entire unit should be throughly cleaned inside and out.
Condensate Pan and Drains
- Must be free of dirt and trash. Clean strainer and be sure drain is open.
Filters
- Never run unit without return air filters. Inspect filters bi-weekly. Clean or replace at least four time a
year. Replace filter with dirtiest side facing upstream. Filter may be clean by dipping and washing in ordinary
soap water. Dry them up before inserting into unit again.
Lubrication
- Fan motor bearing are factory lubricated and will need no further lubrication for the first five year
(three years at continuous service or excessively dirty conditions). Inspect bearing add relubricate or replace as
required.
Oil Change
- Level should be between 1/8 to 3/8 of sight glass on all 50BY(015-040), BL(050-080) units. Add
Carrier approved oil, if necessary.
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: ......
