Reznor OB Option User Manual

Option DH1 Draft Booster

Relay Package

INST ALLATION FORM RZ-NA-I-OIL-DBR

APPLIES TO: Models OH andOB

Obsoletes Form RZ-NA 417/461&4-DBR

Models RA and RAD 1 10/140/235/350/500

WARNING: Incorrect installation of the draft booster relay and/or field supplied draft booster could cause property damage, personal injury , and/ or death.

Description/Application

Option DH1, Draft Booster Relay Package, includes the required relay, hardware, and wires to provide proper operation of a field-supplied draft booster on a Reznor

The option package (P/N 110780) includes:

Qty P/N Description

1 103318 RBM Relay, Essex #134-50203-301

2 38529 Sheet metal screws, #8 x 1/2" long

1 110774 White Wire Assembly consisting of 6" long,

1 110775 Orange Wire Assembly consisting of 5" long,

1 110777 Black Wire Assembly consisting of 7" long,

1 110779 Red Wire Assembly consisting of 4" long,

1 111066 Yellow Wire Assembly consisting of 5" long, 14-

1 16354 Wire Nut #73B

oil-fired unit heater.

18-gauge, 105°C white wire with one terminal

18-gauge, 105°C orange wire with one terminal

14-gauge, 105°C black wire with one terminal

14-gauge, 105°C red wire with one terminal

gauge, 105°C yellow wire with one terminal

5. Following the appropriate wiring diagram below and the wiring diagram on the heater, make the proper wire connections. Use the wire nut to attach the 14-gauge yellow wire to the draft booster field wiring. The field-supplied draft booster must include proof of flow contacts (exhaust flow switch). This switch must be capable of handling a 7.5 amp inductive load. Wire these contacts according to the diagram on the heater.

WARNING: Orange jumper wire must be removed. Models RA/RAD, orange wire is between Terminals 5 and 6; Models OH/OB, orange wire is between Terminals 6 and 7.

Installation Instructions

These instructions are designed to assist a qualified electrician in installing this draft booster relay. All electrical wiring and connections, including electrical grounding, MUST be in accordance with the National Electric Code ANSI/NFPA No. 70 (latest edition) or, in Canada, with the Canadian Electrical Code, Part 1-C.S.A. Standard C22.1 In addition, the installation must comply with local ordinances.

1. Assemble the relay and wires. The wire connections on the relay are numbered. Push the terminals onto the proper connections.

Terminal No. 1- 6", 18 gauge white wire. Terminal No. 2- 7", 14 gauge black wire. Terminal No. 3- 5", 18 gauge orange wire. Terminal No. 4- 5", 14 gauge yellow wire. Terminal No. 5- 4", 14 gauge red wire.

2. Turn off the electrical power to the unit by putting the disconnect switch in the “off” position.

3. Open the main electrical box on the end of the heater. Above the terminal blocks, there is provision made to add a row of relays in the junction box. The draft booster relay is designed for the extreme left position. Using the two screws provided, fasten the relay in this position.

4. Above the draft booster relay, remove one of the hole plugs in the top of the electrical box. Use this for entry of the draft booster wiring.

800-695-1901 www.RezSpec.com

is registered in the United States and other countries.

6. Close the electrical box. Turn on the power by putting the disconnect switch in the “on” position.

7. Check for proper operation of the draft booster and heater.

Sequence of Operation:

Start-Up

1) Thermostat calls for heat, energizing ignition controller.

2) Ignition controller activates draft booster relay which energizes draft booster motor.

3) Exhaust flow switch closes, activating the burner motor and fuel valve.

4) Heater fires and operates until thermostat is satisfied.

Shutdown

1) Thermostat shuts off power to ignition controller.

2) Draft booster motor and fan/ blower continue to operate until fan control is cooled (approximately 2-1/2 minutes).

Form RZ-NA-I-OIL-DBR, Mfg #110781, Page 1