White Rodgers 37-0882C User Manual

Hot Water Controls

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.

These hot water controls were designed for use on hot water
heating installations but they may be used on other heating
applications to control the temperature of other fluids. The fluid
they are to be used with must not be corrosive to copper.

These controls have capillary tubing between the temperature
sensitive bulb and the switch mechanism so that the switch
mechanism can be mounted at any convenient location while
the temperature sensitive bulb is located in the fluid to be
controlled.

These controls have special contacts which are suitable for use
on low voltage and millivolt (thermocouple generator type)
circuits as well as line voltage equipment such as gas valves, oil
burner motors, etc.

THESE CONTROLS MUST BE INSTALLED BY A QUALIFIED
INSTALLER

Do not exceed the specification ratings.
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 calibrate this control will void the White-Rodgers
warranty.

WARNING

Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.

Remote T ype

INSTALLATION INSTRUCTIONS

DESCRIPTION

PRECAUTIONS

CAUTION

Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dan­gerous operation.

Following installation or replacement, follow appliance
manufacturer's recommended installation and/or ser­vice instructions to insure proper operation.

CAUTION

To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.

Shut off main gas to heating system until installation is
complete.

If the equipment manufacturer recommends a control location,
follow such recommendations. If none is offered, the following
recommendations should be observed.

When used to control the temperature of a vat or tank, locate the
control bulb in a place representative of the average tempera­ture. Make certain that the fluid being controlled is not injurious
to the copper element.

When used for high limit service on a heating boiler, the control
should be installed in the riser close to the boiler, or in a boiler
tapping that is near the top or hottest section of the boiler. If the
boiler is also used to heat domestic hot water, make sure that the
high limit control is not in that section of the boiler that contains
the heat exchanger or piping for domestic hot water.

WHITE-RODGERS DIVISION

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

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

Printed in U.S.A.

INSTALLATION

When used for low limit or operator service, the control should
be located near that section of the boiler that contains the heat
exchanger or piping for domestic hot water.

Be careful to avoid damage to the capillary tubing between the
control and the temperature sensitive bulb. This tubing should
be led over a path that will protect it from cuts, blows, wear due
to vibration, etc.

CAUTION

Do not dent or bend the bulb as this will change the
control calibration and cause it to cycle at a tempera­ture lower than the dial setting.

PART NO. 37-0882C

Replaces 37-0882B & 37-9025

9546

WIRING

NOTE

All wiring should be done according to local and national
electrical codes.

THERMOSTAT HIGH LIMIT

GAS VALVE

TERMINAL PANEL

TR

TH

TH-TR

24VAC

TRANSFORMER

Used as high
limit control with
36C03 Type Gas
Valve

HOT
LINE
N

If the boiler or burner manufacturer recommends a wiring
diagram, then follow such recommendations.

If none is offered, these diagrams show suggested circuits.

DIAPHRAGM

THERMOSTAT

GAS VALVE

THERM PILOT TRANS

1234

Used as high limit
control with
diaphragm gas valve

TRANSFORMER

TO

LINE

TYPE 668

HOT

N

IGNITION

TRANSF.

BURNER

MOTOR

LINE

OIL BURNER CONTROL

ORANGE

WHITE

LIMIT

CONTROL

Used as high
limit control with

BLACK

oil burner control

THERMOSTAT

SETTING THE CONTROL

CONTROLS WITH ADJUSTABLE DIFFERENTIAL

The movable indicator points to the temperature at which the
contacts open. The fixed indicator points to the temperature at
which the contacts close. The difference between these two
indicators is the differential.

To set the control:

1. Use a screwdriver in the adjusting slot (A) on the front of the
control to turn the dial so that the fixed indicator (B) points
to the temperature at which the contacts will close.

2. Turn the differential adjusting screw (C) until the movable
indicator (D) points to the temperature at which the contacts
will open.

“F” Stop tab

“A” Adjusting

slot

ADJUSTABLE DIFFERENTIAL

“F” Stop tab

“B” Fixed indicator

(cut-in point)

“C” Differential adjusting

screw

“D” Movable indicator

(cut-out point)

“E” Stop screw

“B” Fixed

indicator

LIMIT

CONTROL

AUTOMATIC

IF AUTOMATIC PILOT IS NOT USED,
CONNECT A JUMPER BETWEEN

PILOT

THE PILOT TERMINALS

Used as operating control
for electrically heated tank

TYPE

230-19

TEMPERATURE

CONTROL

HOT

LINE
N

LOAD

CONTROLS WITH A FIXED DIFFERENTIAL

The indicator (B) points to the temperature at which the contacts
open.

To set the control:

Use a screwdriver in the adjusting slot (A) on the front of the
control to rotate dial until the desired temperature at which
the contacts will open is positioned directly under the
indicator (B).

CONTROLS WITH ADJUSTABLE STOPS

CAUTION

Setting stop higher than control being replaced could
cause personal injury and/or property damage.

1. Loosen stop screw (E) with enclosed wrench.

2. Set dial to original equipment manufacturer's specification.

3. Without moving the dial, move stop tab (F) against indica­tor.

4. Retighten stop screw (E).

“E” Stop screw

“A” Adjusting

FIXED DIFFERENTIAL

slot

2