WIRING
All wiring should be done in accordance with local and national electrical codes and ordinances.
When using this relay to control both line and low voltage loads, wires must be formed so that low voltage wires do not touch line voltage terminals and line voltage wires must not touch low voltage terminals. Low voltage wires (except to “Therm” terminals) must be N.E.C. Class 1
T T
1 | 2 |
LOW VOLTAGE
HOT
LINE
N
TO LOAD
insulated type only.
3 
4
TO POWER
If the manufacturer of the boiler or the burner has supplied wiring diagrams, then follow such recommendations. If none are supplied, the diagrams shown on the next two pages show representative circuits. Type
THERMOSTAT
5 
6
Fig. 2
TO LOAD 
TO POWER
TYPE 668 OIL
BURNER CONTROL
(LINE VOLTAGE)
DIAGRAM FOR BOILER WITHOUT DOMESTIC COIL
NOTE
This circuit can be functionally duplicated by using a Type 809A Relay (SPST) instead of a Type 829A Relay (DPST). Refer to sheet included with Type 809A Relay for wiring diagram.
When the thermostat calls for heat, the burner starts. The circulator also starts if boiler temperature is above setting of circulator control.
If excessive boiler temperature causes high limit to open, the circulator continues to run but the burner shuts down until the high limit recloses.
When low boiler temperature causes circulator control to open, the burner stays on but the circulator stops until the circulator control recloses. When thermostat is satisfied, both burner and circulator stop.
Fig. 3 | HOT | LINE |
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| N |
| TRANS. | ||
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| IGNITION |
THERMOSTAT |
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T | T |
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| X | X | BURNER |
| 1 |
| 2 |
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| MOTOR |
| 3 |
| 4 |
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FIELD |
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| CIRCULATOR |
INSTALLED | 5 |
| 6 |
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| MOTOR | |||
JUMPERS |
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| HIGH | CIRCULATOR |
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| LIMIT | CONTROL |
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| 24 VAC |
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| GAS VALVE |
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| HIGH LIMIT | |
TRANS.
Fig. 3a & 4a Diagram for
X X
DIAGRAM FOR BOILER WITH DOMESTIC COIL WITH STORAGE TANK
The low limit control maintains domestic hot water at desired temperature
When the thermostat calls for heat, both the burner and circulator start. If excessive boiler temperature causes high limit to open, the circulator continues to run, but the burner shuts down until the high limit recloses.
When the thermostat is satisfied, both the burner and THERMOSTAT circulator stop.
Fig. 4
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| TYPE 668 OIL |
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| BURNER CONTROL |
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| (LINE VOLTAGE) |
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| HOT | LINE | N |
| IGNITION |
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| TRANS. |
T | T |
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| 1 | 2 | X | X | BURNER |
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| MOTOR |
| 3 |
| 4 |
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| 5 |
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| CIRCULATOR |
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| MOTOR | |
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| 6 |
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FIELD INSTALLED |
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JUMPERS |
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HIGH | LOW | ||
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| LIMIT | LIMIT |
2
