Reznor RPB Unit Installation Manual - Manual (Page 27)

Form I-RPB, P/N 131782 R12, Page 27
7.4 Thermostat,
Other Optional
Controls, and
Control Wiring
24 Volt Controls - Maximum Amps
Single-Stage Valve - .6 Maxitrol System - .5
Fan Control - .12 Relay Coil - .12
Two-Stage Valve - .6 Spark Ignition System - .1
Time Delay Relay Heater - .1 Motor Contactor Coil - .33
A thermostat is not standard equipment but is an installation requirement. Use either
an optional thermostat available with the system or a field-supplied thermostat. Install
according to the thermostat manufacturer's instructions.
A 24 volt thermostat must be used to actuate low voltage gas controls. If line voltage
from the thermostat to the unit is desired, consult the factory representative.
Thermostats should be located five feet (1.5M) above the floor on an inside wall, not in
the path of warm or cold air currents and not in corners where air may be pocketed. Do
NOT install on cold air walls. For specific connection details, refer to instruction packet
with the thermostat.
CAUTION: Make sure the thermostat has an adequate VA rating for the
total requirements. Add coil rating of all relays and match thermostat
rating. See Hazard Levels, page 2.
Wiring Requirements
for Maxitrol Systems
Control wires connected to a Selectrastat, a discharge air sensor, a remote tempera-
ture selector or sensor, an amplifier, or the valve must not be run close to or inside
conduit with power or ignition wires. Doing so may cause the unit to function erratically
or may destroy the amplifier. If shielded wires are used, shield must be insulated and
grounded at the amplifier location only.
Field Control Wiring - Length and Gauge
Total Wire
Length
Distance from
Unit to Control
Minimum Recommended
Wire Gauge
150 ft (46M) 75 ft (23M) #18 gauge
250 ft (76M) 125 ft (38M) #16 gauge
350 ft (107M) 175 ft (53M) #14 gauge
Remote Console
If the unit being installed includes an optional console, it is shipped separately for field
installation. All consoles include indicator lights for the blower and burner. Consoles
may include a dirty filter indicator light, a cooling indicator light, an on/off switch, a sum-
mer/off/winter switch, a heat/vent/cool switch, a potentiometer, a thermostat, and/or a
Maxitrol temperature selector. Consoles are shipped separately for remote installation
and may be either mounted on a wall or recessed.
If more than one unit is cycled from one thermostat, separately activated relays must
be substituted at unit thermostat connections.
There are a variety of optional controls available as part of the gas and air control
options. Check the wiring diagram and literature supplied with the unit for operation of
factory-installed optional controls. See FIGURE 29, page 28, for location of standard
and optional controls.
Optional shipped-separate heating and makeup air controls could include a single or
two-stage thermostat, system switches, selectrastat, discharge temperature low limit,
an automatic night setback device, a Maxitrol temperature selector, a potentiometer,
a pressure null switch, or a combination of these controls. Install controls according to
the manufacturer's instructions packaged with the heater.
A selection of remote consoles is available with certain appropriate combinations
of controls factory mounted. All consoles include indicator lights for the blower and
burner, an off/on system switch, and terminal block wiring.