All installations and services must be performed by qualified service personnel.

3.All wiring sizes must comply with local codes or the National Electrical Code. To minimize voltage drop to the appliance, the next larger size wire should be used when long wiring runs, in excess of 100 ft., are employed. Refer to the wiring diagrams when wiring or servicing.

NOTICE: Proper operation of the heating section of this unit depends upon correctly connecting the electrical power source. The hot leg, L1, of the supply circuit must be connected to the black line lead and the neutral leg, N, to the white line lead in the burner compartment junction box. All ungrounded circuit conductors must be broken by the disconnecting switch to prevent the hazard of electrical shock when servicing this appliance.

In the event a circuit breaker trips or a fuse blows as a result of the operation of this appliance, investigate the appliance electrical system to determine the cause. Correct any electrical faults and abnormal conditions before putting the unit back into operation. Do not put in a larger fuse and do not exceed maximum fuse size listed on the rating label in order to temporarily “fix” the problem. The rating label is located on the inside of the burner compartment cover.

The appliance control system contains a 15 amp. circuit breaker to protect the heating system control circuitry. The control fuse is located within the junction box, which is located in the burner compartment. In the event of a main circuit breaker trip, this may need to be reset as well.

1.Electronic Air Cleaner (EAC) and Humidifier Installation

The fan timer on this unit has designated terminals to control the operation of an electronic air cleaner and/or humidifier. These terminals provide line voltage for the control of these accessories, refer to Figure 4.

Connection between EAC and N6 provides a switched 115 vac to power an electronic fan cleaner.

The same switched 115 vac is available between Fan and N7 and may be used in conjunction with a humidistat to control a humidifier.

These terminals are energized whenever the blower is active.

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Thermo Products OPB (24, 36)- 80, 30 service manual