Form I-XE/CRGB/RPB, Mfg No. 131782 Rev 4, Page 17
27
30 31 32 33 34 35 36 37 38 39 40
43
26 29 25 28 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8
7
Optional
Downturn
Plenum
(Option AQ)
42
41 1
2
3
4
5
6
FIGURE 19 - Location of Standard and
Optional Controls - Outdoor Systems
1. Opt
Auto Reset Freezestat
2.
Combustion Air Pressure Switch
(power-vented)
3. Opt
Discharge Air Firestat
4
. Ignition Controller
5 . Optional
Maxitrol Discharge
Air Sensor (Opt AG8 or 9)
6 . Optional Two
-Stage Control-
ler (Opt AG3) or Maxitrol
Amplifier (Opt AG7, 8, or 9)
7. Optional
Main Low Gas
Pressure Switch
8 . Optional
Pilot High Gas Pres-
sure Switch
9. Optional
Main High Gas
Pressure Switch
10.
Time Delay Relay (power-
vented)
11.
Limit Control
12.
Fan Control
13. Optional
Freezestat Time
Delay Relay
14.
Line Voltage Terminal Block
15.
Low Voltage Terminal Block
16.
Freezestat Relay
17. Optional
Dirty Filter Pressure
Switch
18.
Line Voltage Connection (field)
19. Optional
Convenience Outlet
20.
Blower Motor Contactor or
Starter
21. Optional
High Ambient Limit
Control
22. Optional
Outside Air or
Return Air Controller
23. Optional
Mixed Air Control-
ler
24. Optional
Potentiometer
25. Optional
Return Air Dampers
26. Optional
Two Position or
Modulating Damper Motor
27. Optional
Outside Air Damper
28. Optional
Potentiometer
29. Optional
Filters
30.
Blower Motor
31. Optional
Control Relays (as
required, 8 maximum)
32.
Auto Reset Reverse Flow Limit
33. Optional
Return Air Firestat
34.
Low Voltage Terminal Strip
35.
Line Voltage Terminal Strip
36.
Control Transformer
37.
Control Transformer (as
required)
38. Optional
Damper Motor
Transformer
39.
Low Voltage Connection (field)
40. Optional
Air Proving switch
41.
Venter Assembly (power-
vented)
42.
Vent Cap (gravity-vented)
43. Optional
DDC interface
Control
Thermostat, Other Optional Controls, and Control Wiring
If more than one unit is cycled from one thermostat, separately acti-
vated 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 19
for location of standard and optional controls on outdoor
systems.
Optional shipped-separate heating and makeup air controls could in-
clude a single or two-stage thermostat, system switches, selectrastat,
freezestat, 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 instruc-
tions packaged with the heater.
A selection of remote consoles is available with certain appropriate
combinations of controls factory mounted. All consoles include indica-
tor lights for the blower and burner, an off/on system switch, and termi-
nal block wiring.
A thermostat is not standard equipment but is an installation require-
ment. 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.
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
Wiring Requirements for Maxitrol Systems
Control wires connected to a Selectrastat, a discharge air sensor, a re-
mote temperature selector or sensor, an amplifier, or the valve must not
be run close to or inside conduit with power or ignition wires. Doing so
