White Rodgers 1145 User Manual

TYPE 1145

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 control, designed for use on hot water heating systems,
has an element that is immersed directly into the boiler water.
This feature gives unusual speed of response to rapid changes
of water temperature thereby preventing thermal lag.

It has open on rise contact action. This control may be used as
a high limit or as a low limit control.

These controls have special contacts which are suitable for use
on low voltage and millivolt (thermocouple generator type)
circuits as well as line voltage gas valve and motor loads.

HOT WATER CONTROL

Direct Immersion - Adjustable Differential

INST ALLA TION INSTRUCTIONS

DESCRIPTION

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.

If the boiler manufacturer recommends a control location, then
follow such recommendations. If none are offered, the following
information shows suggested locations.

For high limit service, the control should be located in the hottest
part of the boiler. This is usually near the top of the boiler. A high
limit control should not be in the same section of the boiler that
contains the heater or the pipes that heat domestic hot water.

PRECAUTIONS

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.

WARNING

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

INSTALLATION

For low limit or operating service, the control should be so
located, that it responds to the temperature of that section of the
boiler that heats domestic hot water.

When tightening the control into the boiler, care should be taken
to apply all leverage on the hexagonal nut so as not to injure the
diaphragm or control mechanisms.

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.

PART NO. 37-0577E

Replaces 37-0577-3 & 37-9157

9548

WIRING

All wiring should be done in accordance with local and national electrical codes and ordinances.

If the boiler or burner manufacturer recommends a wiring
diagram, then follow such recommendations. If none is offered,
this diagram shows a suggested circuit.

LOW LIMIT APPLICATION — This diagram shows a common
circuit on an oil fired heating system that also heats domestic hot
water which is stored in a tank.

TYPE 668 OIL

BURNER CONTROL

(LINE VOLTAGE)

T

T

HIGH LIMIT

CONTROL

IGNITION

TRANS.

LOW LIMIT

CONTROL

BURNER

MOTOR

Low limit control maintains domestic hot water temperature all
year round.

When thermostat calls for heat, burner and circulator operate.

5

6

THERMOSTAT

T

T

1

3

2

4

HOT

LINE

N

FIELD

INSTALLED

JUMPERS

TYPE

829A RELAY

CIRCULATOR MOTOR

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.

“B” FIXED INDICATOR

(CUT-IN POINT)

“C” DIFFERENTIAL

ADJUSTING SCREW

“D” MOVABLE INDICATOR

(CUT-OUT POINT)

“A” ADJUSTING

SLOT

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.

2