Delfield 500 - Manual (Page 5)

500 Series Display Cases Service and Installation Manual
5
For customer service, call (800) 733-8829, (800) 773-8821, Fax (989) 773-3210, www.delfield.com
Pressure Control
The temperature is controlled by an adjustable pressure
control located in the machine compartment. An adjustable
control has the word COLDER near the knob, with an arrow
to indicate the adjustment direction. These controls are
field adjustable and do not require a service agent. If you
have any questions, feel free to contact the Delfield Service
Department.
The refrigeration systems on self-contained CR & OR models
were adjusted at the factory to maintain between 36°F and
40°F. No adjustment should be necessary. If adjustment
does become needed however, the factory recommended
settings are:
Low-pressure settings (CR models): 82 psi cut-in,
47 psi cut-out, 35 psi differential.
Low-pressure settings (OR models): 82 psi cut-in,
40 psi cut-out, 42 psi differential.
Operating pressures: High, 170 to 200 psi. Low, 30 to 37
psi.
In attempting to adjust the pressure control, you can
do damage to your unit by accidentally adjusting the
differential. Please make small incremental adjustments
if a temperature adjustment is necessary, please contact
the service department at Delfield (800) 733-8829 #1,
or your local service agent. Delfield is not responsible
for charges incurred while having the pressure control
adjusted.
CONTROL SETTINgS: 500 CR & OR