Operations Below 48°F Fluid Or 38°F Ambient - Temptek CF Series Instruction Manual

CF Series Portable Chiller : Air & Water-Cooled : 5 - 40 Tons
8.1 OPERATIONS BELOW 48°F FLUID OR 38°F AMBIENT
A.
The chiller is never to be operated below 48°F leaving water temperature without several
precautionary measures. All controls are factory adjusted for 48°F and above operations.
B.
Before readjusting the protective devices, a satisfactory antifreeze solution must be
substituted for the recirculating chilled water. This mixture will consist of inhibited
propylene glycol and water. Do not substitute an inhibited propylene glycol and water
solution with common automotive type antifreeze. The "Cut-In Cut-Out Settings for High
and Log Pressure Switches chart below outlines the glycol percentages at various water
temperatures.
Cut-Out & Cut-In Settings For High and Low Pressure Switches
Low Pressure Switch
Operating
or Ambient
Glycol
Temperature
48° - 70°F
0%
25° - 47°F
30%
10° - 24°F
40%
Operating
or Ambient
Glycol
Temperature
48° - 70°F
0%
25° - 47°F
30%
10° - 24°F
40%
High Pressure Switch (maximum)
Refrigerant
R22
R134A
R407C
R410A
R404A
C. Fluid must be tested with a refractometer to verify proper glycol percentages for freeze
protection. The ratio shall be according to the chart below. Too much glycol can cause
capacity and control problems.
D. DO NOT USE AUTOMOTIVE TYPE ANTI-FREEZE.
E. Once a satisfactory antifreeze solution is in place the protective devices may be
adjusted and the control instrument can be unlocked to allow operation below
48°F.
Freeze Cut Out Cut In
Point Temp Temp
32°F 32°F 36°F - 39°F
10°F 10°F 15°F - 18°F
-5°F -5°F 0°F - 7°F
Freeze Cut Out Cut In
Point Temp Temp
32°F 32°F 36°F - 39°F
10°F 10°F 15°F - 18°F
-5°F -5°F 0°F - 7°F
Air-Cooled Water-Cooled
380# 360#
260# 260#
405# 360#
610# 550#
405# 360#
525 East Stop 18 Road Greenwood, Indiana 46142
R22
Cut-Out Cut-In Cut-Out
58# 63# 28#
33# 38# 12#
20# 25# 4#
R404A
Cut-Out Cut-In Cut-Out
72# 79# 52#
44# 49# 28#
29# 34# 16#
TEMPTEK, INC.
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
R134A R410A
Cut-In Cut-Out Cut-In
33# 102# 111#
17# 63# 72#
9# 43# 52#
R407C
Cut-In
58#
34#
22#
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