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5D51-35, -78 & -90 |
WHITE-RODGERS |
Fan & Limit Control |
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INSTALLATION INSTRUCTIONS |
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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 fan and limit control combines, in one enclosure, a fan switch with an adjustable differential which operates the blower in a forced warm air furnace and a limit switch with a fixed differential which automatically shuts off the burner if the furnace temperature exceeds a predetermined high point.
DESCRIPTION
A summer fan switch is incorporated in this control to provide a convenient method for manual operation of the fan for air circulation during the summer.
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 WhiteRodgers warranty.
!WARNING
Do not use on circuits exceeding specified voltages. Higher voltages will damage control and could cause shock or fire hazard.
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.
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.
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.
INSTALLATION
Removing Cover
To remove cover from control, grasp cover at top and bottom and pull outward. Grasping the cover by its sides will make removal more difficult.
Location
1.The bimetal element should not be too close to any hot surfaces of the heat exchanger. The element should always be at least 3“ away from any hot surfaces unless the position has been determined acceptable by the furnace manufacturer.
2.If this is a new application, please consult the original equipment manufacturer for proper location.
Mounting, For Flush Mounting (Vertical or Sloping Surface)
1.Insert the element tube into the bonnet and attach control case with #10 screws. (Two screws, diagonally located, are sufficient.)
2.Replace control cover after wiring and making any adjustments to the settings.
WHITE-RODGERS DIVISION |
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EMERSON ELECTRIC CO. |
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9797 REAVIS RD., ST. LOUIS, MO. 63123-5398 |
Printed in U.S.A. |
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(314) 577-1300, FAX (314) 577-1517 |
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PART NO. 37-1558B
Replaces 37-1558-1
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9999 HWY. 48, MARKHAM, ONT. L3P 3J3 |
9714 |
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(905) 475-4653, FAX (905) 475-4625 |
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Wiring
All wiring must conform to local and national electrical codes and ordinances.
Connect in accordance with the wiring diagrams provided by the equipment manufacturer. If none are provided, the following represents a typical installation.
Jumper |
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Factory Installed |
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Optional Remote |
On Some Models |
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Manual Switch |
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For Summer Fan |
To Oil Burner |
Limit |
Fan |
Switch |
Switch |
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Control Or |
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Transformer Primary |
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L1 |
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Fan |
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Line |
Motor |
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L2 |
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Note: Make L1 “HOT” on |
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120V installation |
Diagram Using Limit In Line Voltage Circuit
CAUTION: Line voltage jumper is factory installed on some models. This jumper must be removed when limit switch is used in low voltage or millivolt circuit.
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Optional Remote |
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Manual Switch |
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For Summer Fan |
To Low Voltage |
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Or Millivolt |
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Burner Circuit |
Limit |
Fan |
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Switch |
Switch |
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L1 |
Fan |
Line |
Motor
L2
Note: Make L1 “HOT” on 120V installation
Diagram Using Limit In Low Voltage
or Millivolt Circuit
OPERATION
SUMMER FAN OPERATION
The cover does not have to be removed to access the lever. To turn the fan on, slide the lever to the left “MAN” position. To turn the fan off, slide the lever to the right “AUTO” position.
For automatic operation of the fan during the heating or cooling season, the lever must be in the “AUTO” position.
SETTING THE DIAL
To set pointers, hold dial securely with one hand and move the pointers with the other hand. Do not force the pointers past any stops on the dial even though the dial may be graduated beyond the stops.
Limit
Move the right hand pointer so that its straight edge indicates the temperature at which the contacts should open. The limit pointer should never be set any higher than the setting recommended by the furnace manufacturer.
Fan
Move the “Fan On” pointer so that its straight edge indicates the temperature at which the fan contacts should close to start the blower. Move the “Fan Off” pointer so that its straight edge indicates the temperature at which the fan contacts should open to stop the blower.
MAN
AUTO
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Right Hand |
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Pointer |
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Center |
(Limit Opens) |
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Pointer |
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(Fan On) |
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Limit Stop |
Left Hand |
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Pointer |
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200 |
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(Fan Off) |
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5 |
2 |
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1 |
0 |
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50 |
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0 |
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3 |
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1 |
0 |
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0 |
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0 |
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0 |
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5 |
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FAN |
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LIMIT |
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HOLD DIAL WHEN |
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CHANGING INDICATORS |
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DO NOT ADJUST
SAFETY STOP
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