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.
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 (314) 577-1300, FAX (314) 577-1517
9999 HWY. 48, MARKHAM, ONT. L3P 3J3 (905) 475-4653, FAX (905) 475-4625
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
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