Bakery Chiller Models PMC 40/50 and PMC 70/120
Effective February 23, 1999
Installation and Operation Instructions, Part No. 9842311
Revised May 7, 2009
2.5
Refrigeration Unit Installation
All refrigerant piping should be in accordance to acceptable refrigeration practices. Distance between
refrigeration unit and bakery chiller assembly should be as close as possible. Long distance piping and
risers may require attention to reduce restriction of refrigerant flow and to provide adequate oil return.
The liquid line should be
3
/
8
" OD copper pipe and the suction line
7
/
8
" OD copper pipe. A liquid line
drier of adequate size should be installed on all PMC 40/50 RS and RC models. A liquid line drier is
provided on 3.5 hp. units for PMC 70/120 RS and RC models. A liquid line sight glass should be
installed just prior to the thermal expansion valve (TEV) on the bakery chiller evaporator assembly.
Attach the thermal expansion valve sensing bulb to the suction line and insulate after refrigerant lines
are installed as shown in Section 7.3 and Figure 7.
Evacuation to 500 microns prior to charging with refrigerant is required. The system must hold 1,000
microns in a standing vacuum test, ensuring that it is leak free.
Refrigerant charging should be through the suction service valve in vapor form only. Charge with an
adequate amount of refrigerant prior to starting the compressor and make sure that water storage tank
is filled with water. Refer to Section 3.0 for start-up procedures.
The initial refrigerant charge for PMC 40/50 model with a 2 hp unit is 6 lbs R-22 or 5 lbs. R-507
refrigerant. The initial refrigerant charge for PMC 70/120 models with a 3.5 hp unit is 13 lbs R-22 or 12
lbs. R-507 refrigerant.
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