
INSTALLATION CONT.
Convenient Installation – May be mounted vertically, horizontally, or on an angle. Will not affect operation of control.
Pipe Insulation Should Cover Shield Containing Element.
WIRING
All wiring should be done according to local and national electrical codes.
RED BLUE
COMMON
OPEN ON RISE
OF TEMPERATURE
Refer to the wiring diagram supplied by the boiler or burner manufacturer, or to the suggested circuits included with the primary control. The information below shows the terminals to use for the various applications.
WHITE | Limit Control: When used as either a high limit control or as a | |
low limit control, use the | ||
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CLOSE ON RISE
OF TEMPERATURE
This control has a
Circulator Control: When used as a circulator control, use the
Combination Low Limit and Circulator Control: For this application, all 3 terminals are used. The wiring diagram below shows a typical circuit for a hot water system having a boiler with tankless domestic coil.
Diagram for Boiler with Tankless Domestic Coil |
| TYPE 668 OIL | |||||
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HIGH | 24 VAC |
| (USE | BURNER CONTROL | |||
(LINE VOLTAGE) | |||||||
LIMIT | GAS VALVE |
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| HOT | LINE | N |
| IGNITION | |
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| TRANS. |
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X | X | Diagram for |
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| X | X |
| BURNER | |
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| B | 1 | 2 |
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| W |
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| MOTOR |
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| JUMPER | 3 | 4 |
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| JUMPER |
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| CIRCULATOR |
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| MOTOR | |
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| R | B |
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| W |
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| HIGH | TYPE 1127 | |
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| LIMIT | ||
The |
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| CIRCULATOR | |||
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| CONTROL | ||||
domestic hot water at the desired temperature |
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When the thermostat calls for heat, the burner starts. The circulator also starts if the
If excessive boiler temperature causes the high limit to open, the circulator continues to run but the burner shuts down until the high limit recloses.
If low boiler temperature causes the
When the thermostat is satisfied, the circulator stops. The burner also shuts down if the
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