Reznor B Unit Installation Manual - Manual (Page 25)

Form I-F/B, P/N 98126 R21, Page 25
Multiple Heater Control - These unit heaters are not designed for multiple unit connection to one thermostat.
If you require that more than one unit be controlled by a single thermostat, it will be
necessary to use relays in the circuit. Options CL31 and CL32 provide the necessary
parts and instructions for multiple heater control.
The multiple heater control options are designed to permit the control of up to six heat-
ers with a single thermostat or time clock and single/multiple thermostats.
For maximum safety, the multiple control is in the low voltage circuit. These multiple
heater control options may not be used with two-stage gas valves.
When factory-installed options require two-stage thermostat control, the heater is
equipped with a SP-ST relay and a four-screw terminal connector strip (See FIGURE
27).
If your heater requires field installation of the four-screw terminal strip and the relay,
follow the instructions packaged with the relay or thermostat option. FIGURE 28 illus-
trates the wiring and the connections required for an optional field-installed fan relay.
Two Screw
Terminal Connector
Strip
FIGURE 26 - Two Screw
Terminal Connector Strip for
24-Volt Wiring
FIGURE 27 - Optional
Four Screw Terminal
Connector Strip for 24-Volt
Wiring
Optional Four
Screw Terminal
Connector Strip
FIGURE 28 - Wiring Diagrams for Field-Installed Fan Relay (Option CL21)
575/3/60
FIGURE 29 - Wiring
Label for Multiple
Heater Control Wiring
with Options CL31 and/
or CL32