White Rodgers 241-2, 1609 User Manual

241-2 & 1609 Series

WHITE-RODGERS

Operator: Save these instructions for future use!

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

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.

The 241-2 control has a two-circuit contact structure which will
simultaneously close two circuits on a rise of temperature and
open them on a fall of temperature.

!

WARNING

FIRE/SHOCK HAZARD

Disconnect power to system at main fuse
or circuit breaker box before installation.

Do not use on circuits exceeding speci­fied voltages.

CAUTION

FREEZE HAZARD
Install low temperature limit device.
System malfunction may cause freeze

damage.

Refrigeration Temperature Controls

INSTALLATION INSTRUCTIONS

DESCRIPTION

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.

PRECAUTIONS

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
voltage, 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 manu­facturers’ recommended installation/service instructions to in­sure proper operation.

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
average 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

WHITE-RODGERS DIVISION

EMERSON ELECTRIC CO.
9797 REAVIS RD., ST. LOUIS, MO. 63123-5398
[phone], FAX [phone]

9999 HWY. 48, MARKHAM, ONT. L3P 3J3
[phone], FAX [phone]

Printed in U.S.A.

INSTALLATION

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.

PART NO. 37-1104F

Replaces 37-1104E

9909

WIRING

Temperature

control

Low temperature

limit

Suction

pressure

control

High side

pressure

control

Motor

starter

Solenoid

refrigerant

valve

To
Compressor
Motor

Line

L1

L2

Note:Make L1 “HOT” on

120V installation

240V

22.2A

22.2A

LOAD CONDITIONS

MAXIMUM ALLOWABLE RATING

Full Load Locked Rotor

120V

7.4A

7.4A

120V

44.5A

44.5A

240V

3.7A

3.7A

Load between Blue and Red
terminals must not exceed:

Load between Blue and White
terminals must not exceed:

All wiring must conform to local and national electrical codes and ordinances.

Connect in accordance with wiring diagrams provided by the equipment manufacturer. If none are provided, the following
represents a typical installation.

Controls with one circuit (two terminals)

Low

temperature

limit

Temperature

control
L1
Line
L2

Note:Make L1 “HOT” on

120V installation

Circuit showing temperature control con­trolling compressor directly.

High side

pressure control

(if used)

To
Compressor
Motor

Circuit showing temperature control to open and close
refrigerant valve. Suction pressure control starts and stops
compressor through motor starter.

Controls with two circuits (three terminals)

This diagram shows a typical two-circuit applica­tion. Several zones receive refrigeration from the
same compressor, but each zone requires its
own solenoid refrigerant valve and temperature
control.

SETTING THE DIAL

The movable indicator (D) points to the temperature at which the
compressor starts. The fixed indicator (B) points to the tempera­ture at which the compressor will stop. The difference between
these two indicators is the differential. Follow these instructions
to set the dial:

1. Insert a screwdriver in the adjusting slot (A) and turn the dial
until the fixed indicator (B) points to the temperature at which
the compressor is to stop.

BLUE

RED

WHITE

Note:Make L1 “HOT” on

120V installation

Compressor

Motor

2

The blue terminal is common. The table below shows the
maximum load allowed between terminals.

L1
Line

L2

R

B

W

Valve
No. 1To

R

B

W

To

Additional

Units

Valve
No. 2

2. Turn the differential adjusting screw (C) until the movable
indicator (D) points to the temperature at which the com­pressor is to start.

“B” Fixed indicator

(cut-out point)

“C” Differential

adjusting screw
“D” Movable indicator

(cut-in point)

“A” Adjusting

slot