Form I-RDF, P/N 148384 (Rev 1), Page 11
Control Side
Control
Compartment*
Blower
Compartment
Supply Wiring**
24V Wiring**
Gas Supply
CAUTION: If any of the
original wire must be
replaced, the replace-
ment wire must have a
temperature rating of at
least 105°C except for
controls mounted in the
discharge airstream
which must be 150°C.
See Hazard Levels, page
2.
trical Code Part 1-C.S.A. Standard C22.1. When attaching the disconnect switch
to the heater, use hardware with "teeth" to provide electrical grounding. The
"teeth" should face the disconnect switch, scratching off the painted surface.
Attach the disconnect tightly against the heater cabinet. Run cable so that it
does not interfere with cabinet panels or doors.
When providing or replacing fuses in a fusible disconnect switch, use dual
element time delay fuses and size according to 1.25 times the maximum total
input amps.
Convenience Outlet Option
When a convenience outlet option is included, an individual power supply
must be provided to the receptacle. This circuit MUST BE on a ground fault
breaker to meet requirements. All wiring to the convenience outlet must meet
National Electrical Code ANSI/NFPA No. 70 (latest edition) or the Canadian
Electrical Code Part 1-C.S.A. Standard C22.1. and any local or utility codes
that may apply.
Control Wiring Maximum Lengths (ft)
Volts
Wire
Gauge
Total Wire
Length
Distance from
Unit to Control
24
18
150
75
24
16
250
125
24
14
350
175
Control Wiring Maximum Lengths (M)
Volts
Wire
Gauge
Total Wire
Length
Distance from
Unit to Control
24
18
45.7
22.9
24
16
76.2
38.1
24
14
106.7
53.3
FIGURE 8 - Location of Gas Connec-
tion, Electrical Supply Connection, and
Control Wiring Connections on RDF
Series 3 Direct-Fired Systems
FIGURE 9 - Option RC14 with Dirty
Filter Light and Potentiometer
If ordered, the optional remote console is shipped separately. Re-
mote consoles include terminal blocks for wiring. Depending on
what gas control or inlet air options were ordered, the console could
include a temperature selector and/or a potentiometer. If a dirty
filter switch is ordered the indicator light is on the console. See
FIGURE 10 for console size.
NOTES:
* RDF-2 and RDF-3 Series 3 systems have double hinged doors as
illustrated. Control compartment on RDF-1 Series 3 systems has a
single hinged door.
** Configuration shown is for RDF-2 and RDF-3 Series 3. The
supply connection on the RDF-1 Series 3 systems is above the
control wiring connection.
Disconnect
Switch
Location
Control Wiring
A 7/8" diameter opening suitable for watertight conduit connection is pro-
vided as the entrance of 24-volt control wiring to the electrical compartment.
For location, see FIGURE 8. Low voltage wiring must be in individual con-
duit, separated from primary high voltage wiring.
CAUTION: Supply voltage and 24-volt control wiring cannot be
installed in the same conduit. Maxitrol systems will be adversely
affected if control wiring is in conduit with supply voltage wiring.
If required, field-supplied wiring between any Maxitrol
components must be completed with shielded wiring.
A 3-position control switch mounted in a 4x4 box is supplied with each system
(exception - not included with systems with Option AG37 designed for com-
puter control), either packed loose inside the unit, or if an optional control
console (Option RC13 or RC14; See FIGURE 9) is ordered, the switch is
mounted on the console.
Control wiring requirements depend on the options selected. Follow the cus-
tom wiring diagram supplied with the system to connect any remote controls.
In this paragraph, there is a brief description of the optional electrical controls
used for airflow. Refer to the operation manual, Form O-DV/RDF/ADF, for
additional control information.
