Temptek CF Series Instruction Manual page 33

CF Series Portable Chiller : Air & Water-Cooled : 5 - 40 Tons
3.
B. INSTRUMENT OPERATION
1.
2.
3.
4.
5.
PRECAUTIONS:
The chiller control is programmed from the factory with a setpoint
range of 48° to 70°F. To operate below 48°F, the addition of inhibited
propylene glycol and modification of the limit control settings are
required. Diligent monitoring of the water/glycol solution is mandatory
to prevent freezing of the evaporator. Freezing may cause the
evaporator to rupture allowing water and freon to mix which will
cause major damage to the refrigeration system.
R134A and R407C models operating above 70°F and R404A models
operating above 60°F require the addition of a refrigerant crankcase
pressure regulating (CPR) valve. The CPR valve is necessary to
prevent overloading of the compressor which can cause premature
failure. R410A models may be operated up to 80°F without a CPR
valve.
Contact your local refrigeration contractor or the factory for further
information. The operating range of the chiller control may be
changed to 10°F - 90°F by adjusting the Setpoint Lockout (SPL)
jumper. Refer to Section 3.3.c.3 of this manual for more information.
To start the unit, toggle on the illuminated ON/OFF SWITCH. The
pump will start and the chiller control will begin temperature control
operations.
To select setpoint temperature, press and hold the UP ARROW
or DOWN ARROW keys until the desired set point temperature is
displayed in the TEMPERATURE WINDOW. The default range for
the setpoint temperature is 48° - 70°F or 9° - 21°C.
The setpoint temperature can be displayed by pressing the UP
ARROW or DOWN ARROW keys. The setpoint temperature will be
displayed for 5 seconds.
When the compressor is turned off, the instrument will wait 3 minutes
before turning it back on regardless of the To Process temperature
or setpoint. If a fault has occurred, the control will attempt to turn the
compressor back on after 3 minutes. If the fault condition remains,
the compressor will not restart and the control will retry after 1
minute. This sequence will repeat 3 times then the system will lock-
out and the unit must be powered off/on to restart the unit.
Under normal conditions (no fault conditions, compressor has been
off for three minutes) the instrument will turn on the compressor
when the To Process temperature is above the setpoint. The
instrument will engage the capacity control system (digital unloading
or hot gas bypass) when the To Process temperature is below the
setpoint by no more than 3 degrees.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352
TEMPTEK, INC.
Fax: 317-881-1277
Email: service@Temptek.com
Page: 33