Heatcraft Refrigeration Products H-IM-FL1A, Installating And Operation Manual

12

Field Wiring

  WARNING:  All wiring must be done in accordance with  

        applicable codes and local ordinances.

The field wiring should enter the areas as provided on the unit. 

The wiring diagram for each unit is located on the inside of the 

electrical panel door. All field wiring should be done in a profes-

sional manner and in accordance with all governing codes. 

Before operating unit, double check all wiring connections, 

including the factory terminals. Factory connections can vibrate 

loose during shipment. 

  1. The nameplate on the unit is marked with the electrical  

    characteristic for wiring the unit. 

  2. Consult the wiring diagram in the unit cooler and in the  

    condensing unit for proper connections.  

   3. For air cooled condensers, due to multiple low amp motors,  

    we recommend using time delay fuse protection instead of  

    circuit breakers.

Check Out and Start Up 

After the installation has been completed, the following points 

should be covered before the system is placed in operation:  

  (a)  Check all electrical and refrigerant connections. Be 

sure they are all tight. 

  (b)  Check high and low pressure controls, pressure  

regulating valves, oil pressure safety controls, and all  

other safety controls, and adjust if necessary. 

  (c)  Check the room thermostat for normal operation  

and adjust. 

  (d)  Wiring diagrams, instruction bulletins, etc. attached  

to the condensing units should be read and filed for  

future reference.  

  (e)  All fan motors on air cooled condensers, evaporators,  

etc. should be checked for proper rotation. Fan motor  

mounts should be carefully checked for tightness and  

proper alignment.  

  (f)  Electric and hot gas evaporator fan motors should be    

temporarily wired for continuous operation until the room  

temperature has stabilized. 

  (g)  Observe system pressures during charging and initial  

operation. Do not add oil while the system is short of  

refrigerant unless oil level is dangerously low. 

  (h)  Continue charging until system has sufficient refrigerant  

for proper operation. Do not overcharge. Remember that  

bubbles in a sight glass may be caused by a restriction  

as well as a shortage of refrigerant. 

  (i)  Do not leave unit unattended until the system has  

reached normal operating conditions and the oil charge  

has been properly adjusted to maintain the oil level at the 

center of the sight glass. 

  CAUTION:  Extreme care must be taken in starting compressors 

  for the first time after system charging. At this time,  

  all of the oil and most of the refrigerant might be in  

  the compressor creating a condition which could  

  cause compressor damage due to slugging.  

  Activating the crankcase heater for 24 hours prior  

  to start-up is required. If no crankcase heater is  

  present, then directing a 500 watt heat lamp or  

  other safe heat source on the lower shell of the  

  compressor for approximately thirty minutes will be  

  beneficial in eliminating this condition which might  

  never reoccur.

 WARNING:  Scroll compressor is directional dependent. 

  If noisy, change phase of input wiring. 

Refrigerant Charging Instructions

  1. Install a liquid line drier in the refrigerant supply line  

    between the service gauge and the liquid service port  

    of the receiver. This extra drier will insure that all refrigerant  

    supplied to the system is clean and dry.
  2. When initially charging a system that is in a vacuum, liquid  

    refrigerant can be added directly into the receiver tank.
  3. Check serial data tag attached to the unit for refrigerant 

    capacity. System refrigerant capacity is 90% of receiver  

    capacity. Do not add more refrigerant than the data tag  

    indicates. Weigh the refrigerant drum before charging so  

    an accurate record can be kept of the weight of refrigerant  

    put in the system.
  4. Start the system and finish charging until the sight glass  

    indicates a full charge and the proper amount has been  

    weighed in. If the refrigerant must be added to the system   

    through the suction side of the compressor, charge in  

    vapor form only. Liquid charging must be done in the  

    high side only or with liquid metering devices to protect  

    the compressor.