WHITE-RODGERS 8F48A Index Hydronic Instruction Manual

WHITE-RODGERS 8F48A Index Hydronic

INSTALLATION INSTRUCTIONS

TYPE 8F48A WITH VENT DAMPER HARNESS RELAY-HOT WATER COMBINATION CONTROL For use with 24 VAC Gas Valve (Suitable for External Zone Valve Load) FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY,
BEFORE INSTALLING OR OPERATING THIS CONTROL, COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.

KEEP THE INSTRUCTION SHEET FOR FUTURE USE
The 8F48A Relay-Hot Water Control combines a High Limit Control, a Transformer, a Circulator Relay and Wiring Terminals into a single unit. It is suitable for use on boilers equipped with a 24V gas valve. These controls are designed primarily for use on boilers that do not supply domestic hot water. However, they are equipped with an extra terminal to permit them to be used on boilers with tankless domestic coils by the addition of a separate SPDT low limit-circulator control. The internal transformer supplies power for operating a 24v gas valve as well as the relay coil. On systems zoned with motorized water valves, the internal transformer may also be used for powering some (or all) of the water valves. These controls are also equipped with a multi-pin connector that makes them suitable for use with harness-connected vent dampers. Consult the original equipment manufacturer for compatibility with the vent damper.

SAFETY

ELECTRICAL RATINGS

• Input Voltage: 120VAC, 60 HZ.
• Circulator Motor: 8.0 Amps Full Load Current (120VAC) 48.0 Amps Locked Rotor Current (120VAC)
• Gas Valve: 24.0VAC, 0.65 Amp
• Combined Load of Zone Valves: Internal transformer (terminals TV and Z) may be used for supplying power to four W-R Type 1311 or three Type 1361 zone valves. (For other zone valves, total zone valve load not to exceed 1.2A)

NOTE: For systems using a vent damper reduce the number of zone values by one.

ROOM THERMOSTAT
Set the adjustable heater (anticipator) at 0.25 A., or use a fixed heater with a 0.25 Amp Rating.

HOT WATER CONTROLS

• Range: High Limit – 140 to 240° F. (Some models have a Preset Dial Stop. Adjustments should be made by authorized servicemen only.)
• Differential: High Limit – 8°F Fixed
• Switch Action: High Limit – Open on rise

SPECIFICATIONS

• If in doubt about whether your wiring is millivolt, line or low voltage, have it inspected by a qualified heating and air conditioning contractor.
• Do not exceed the specification ratings.
• All wiring must conform to local and national electrical codes and ordinances.
• This control is a precision instrument which requires careful handling. Rough handling or distortion of components couldcause the control to malfunction.

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 – could cause shock or fire hazard.

INSTALLATION

NOTE
If the boiler manufacturer recommends a control location, then follow such recommendations. Otherwise, locate the control as close to the top of the boiler as possible, but not in the same section of the boiler that has fittings for domestic hot water. Never locate the control near a return pipe to the boiler.

PREPARING TO MOUNT CONTROL
This control can be mounted vertically or horizontally.

1. Loosen set-screw holding well in place.
2. Push down and out on well and carefully slide the capillary tube in slot.
3. Place well in new notch and tighten set-screw to secure in new position. See Fig. 1.

MOUNTING CONTROL

1. Disconnect electrical power to the boiler.

2. Completely drain the boiler.

3. If a well-tapping is not provided, prepare one near the top of the boiler.

4. Sparingly apply pipe joint compound to well treads and install well.
   NOTE Use brass hex nut for tightening well. Do not attempt to tighten using case as a handle

5. Refill boiler and check for water leaks.

6. Insert the bulb element into the well until it bottoms.

7. Locate the coil of excess tubing so that it cannot touch electrical components.

8. Fit the back of the case well and tighten using a set screw on the back panel.

MOUNTING TO EXISTING WELL
(For use with well adaptor which may be ordered separately.) For best control performance, a well comparable to that shown below is recommended. However, by using a heat conductive grease these controls will give satisfactory performance when used with large-diameter existing wells. If desired, both the conductive grease and replacement wells may be ordered separately (see below ).

DIAL SETTING

When replacing an existing control, adjust the setting of the high limit to correspond with that of the old control. Set pointer to temperature at which contacts of high limit are to open. See Fig. 2..

NOTE Models with a preset diai stop may be adjusted by authorized servicemen only. To reset the dial stop, loosen the stop adjust the screw and reposition the stop to the desired setting. Retighten stop and adjust screw.

WARNING
DO NOT set Stop higher than the original manufacturer’s recommended setting. Personal injury and/or property damage may result.

WIRING AND OPERATION

All wiring should be installed according to local and national electrical codes and ordinances. Fig. 3 below shows wiring connections for a typical installation using the 8F48A with a 36C03 or 36053 24V manifold gas valve.

NOTE
The 8F48A can be operated either with or without the vent damper jumper removed for purposes of standardizing, on one control. However, once the vent damper jumper has been removed and the 8F48A has been used to operate the vent damper, the jumper cannot be reconnected as this will render the 8F48A inoperative. Operation of the 8F48A with the vent damper jumper still installed is as follows: As the room thermostat closes its contacts, the relay coil is energized and closes its two sets of relay contacts. The Manifold Gas Valve opens as the No. 1 Relay Contacts close while the circulator motor starts as the No. 2 Relay Contacts close. When the room thermostat opens its contacts, the Manifold Gas Valve closes and the circulator motor stops. If the boiler temperature exceeds the setting of the high limit while the thermostat is calling for heat, the high limit will close the gas valve but permit the circulator to run as long as the thermostat is calling for heat. With the vent damper jumper removed the gas valve is operated through the vent damper as follows: As the room thermostat closes its contacts, the relay coil is energized and closes its two sets of relay contacts. The vent damper motor opens as the No. 1 Relay Contacts close while the circulator motor starts as the No. 2 Relay Contacts close. The gas valve is energized by a set of contacts in the vent damper motor after it has reached full open. When the room thermostat opens its contacts, the Manifold Gas Valve closes, the vent damper begins to close and the circulator motor stops.

References

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