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PART NO. 37-1104H

Replaces 37-1104G

1018

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.

DESCRIPTION

241-2, 1605-64 & 1609 Series

Refrigeration Temperature Controls

INSTALLATION INSTRUCTIONS

This hydraulic action temperature control is applicable for all
types of commercial or industrial refrigeration applications. This
control will close contacts on rise in temperature and open them
on a fall in temperature.
This control has a two-circuit contact structure which will simul-
taneously close two circuits on a rise of temperature and open
them on a fall of temperature.

INSTALLATION

The switch mechanism of this control may be mounted in any
location, provided that the temperature and humidity of the
air in which it is located do not cause a condensation on the
switch parts.
The sensitive element, or “bulb”, should be located in the

aver-

age temperature

of the controlled area.

Capillary tubing should be led over a path that protects it from
damage from blows, cuts, etc., and should be installed without
kinking or twisting. The tubing should be attached to some surface
at frequent intervals along its length, and should not hang loosely.

Excess tubing should be coiled and secured at a convenient
protected location close to the switch mechanism.
The bulb should be handled with reasonable care, as a dent or
sharp bend may change the calibration and cause the control
to cycle at a temperature different from the dial setting.
Refrigeration and temperature controls are calibrated and
tested under controlled manufacturing conditions. Published
specifications do not include normal manufacturing specifica-
tions. Minor differences in performance could be expected as
conditions change.

PRECAUTIONS

Operator: Save these instructions for future use!

This two-circuit control is intended for use on zoning systems
where all controls operate a common compressor but operate
a separate solenoid refrigerant valve in each zone.

WARNING

CAUTION

THIS CONTROL MUST BE INSTALLED BY A QUALIFIED
INSTALLER.
All wiring must conform to local and national electrical codes
and ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could cause
the control to malfunction.
This control has been accurately calibrated at the factory. Any
attempt to re-calibrate this control will void the White-Rodgers
warranty.
If in doubt about whether your wiring is millivolt, low or line volt-
age, have it inspected by a qualified heating and air conditioning
contractor or a licensed electrician.
Label all wires prior to disconnection when servicing controls.
Wiring errors can cause improper and dangerous operation.
Following installation or replacement, follow appliance manufac-
turers’ recommended installation/service instructions to insure
proper operation.