Dunham-Bush HRSC - D, Operating & Maintenance Instructions

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START-UP CHECK LIST Date ______________
YES NO
Unit Model No. _________________________
Setting Unit:
a. Vibration isolator used _________ _________
b. Spring isolator adjusted for equal heiqht _________ _________
c. If rubber-in-shear isolators are used, is unit leveled by shimming _________ _________
Wiring: a. Power wiring complete _________ _________
b. Control wiring complete _________ _________
c. Electric service adequate for load _________ _________
d. Power source voltage correct for motor(s) used _________ _________
e. Motor circuit has proper size fusetrons _________ _________
f. System wired per diagram _________ _________
g. All wire connections tight _________ _________
h. Wiring complies with local codes _________ _________
i. Flow switch operation _________ _________
j. Microcomputer (if supplied) components dry _________ _________
Piping: a. Piping complies with applicable codes _________ _________
b. External piping independently supported _________ _________
c. Chilled water lines insulated _________ _________
d. All systems refrigerant and water piping leak tested and corrected as _________ _________
necessary
Before Start-Up:
a. Open compressor discharge service valve (if supplied) _________ _________
b. Open liquid valve(s)
_________ _________
c. Open suction, and discharge valves to pressure gauges (if supplied) _________ _________
d. Check rotation of all fan motors _________ _________
e. Start auxiliary equipment (pumps, fans, etc.) _________ _________
f. Is crankcase heater operating? Operate 24 hours prior to
unit start-up.
_________ _________
g. Check the compressor oil level through the crankcase sight glass. _________ _________
The oil level should be 1/2 of the glass. If the level is low, add _________ _________
oil in accordance with the directions in the maintenance instructions _________ _________
h. Check all control settings as specified on unit wiring diagram _________ _________
i. Air purged from chilled water system _________ _________
After Start-up:
a. Check high pressure control _________ _________
b. Check oil temperature safety switch _________ _________
c. Check and adjust low temperature freeze control _________ _________
d. Check and adjust unit controller _________ _________
e. Check and adjust low pressure control _________ _________
f. Check and adjust expansion valve superheat _________ _________
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