Reznor LDAP Unit Installation Manual - Manual (Page 20)

Form I-LDAP, P/N 207733R6, Page 20
Check the rating plate on the heater for the supply voltage and current require-
ments. A dedicated line voltage supply with disconnect switch should be run
directly from the main electrical panel to the heater. All external wiring must be
within approved conduit and have a minimum temperature rise rating of 60°C.
Conduit must be run so as not to interfere with the heater access panel.
7.1 Supply Wiring
All electrical wiring and connections, including electrical grounding MUST be
made in accordance with the National Electric Code ANSI/NFPA No. 70 (lat-
est edition) or, in Canada, with CSA Standard C22.1. In addition, the installer
should be aware of any local ordinances or gas company requirements that
might apply.
7.0 Electrical and
Wiring
Use either an optional thermostat available with the heater or a field-supplied
24-volt thermostat. Install according to the thermostat manufacturer’s instruc-
tions, paying particular attention to the requirements regarding the location of
the thermostat.
Disconnect Switch
FIGURE 13 - Built-in
Disconnect Switch
CAUTION: Route wires so that they do not contact the flue
wrapper or venter housing. When running electrical conduit,
be careful that it is clear of all access panels.
The heater is equipped with a built-in, non-fusible, lockable disconnect switch
( FIGURE 8). If a fusible disconnect is required, it must be field supplied. The
built-in disconnect switch requires copper wiring with ampacity based on 60°C
maximum temperature rating at the line side terminals.
WARNING: To prevent injury or death due to electrocution or
contact with moving parts, lock disconnect switch open. See
Hazard Levels, page 2.
WARNING: If you turn off the power supply, turn off the gas.
See Hazard Levels, page 2.
Model LDAP supply wiring enters above and connects directly to the discon-
nect switch (See FIGURE 3A or 3B in Paragraph 4 and FIGURE 13). A circuit
board (See FIGURE 19 in Paragraph 8.5) is located in the control compartment
of each heat section. The circuit boards are polarity sensitive. It is advisable to
check the electrical supply to be certain that the black wire is the “hot” wire and
that the white wire is the neutral wire. The supply connection made to “L1” on
the disconnect switch must be the “hot” wire.
Each heat section in the heater has a terminal strip for 24-volt thermostat con-
nections. The terminal strip is located on the outside of the cabinet at the front
of each heat section (See FIGURE 3A or 3B in Paragraph 4). Wires from the
terminal strip(s) are factory wired to the circuit board(s).
7.2 24V Control
Wiring
Thermostat and
Connections
Make thermostat connections at the terminal strip on the front of the heater.
The strip has seven terminals, R, G, C, Y1, Y2, W1, and W2. Refer to the wiring
diagram on the heater.
IMPORTANT: All heaters MUST be operated by a 24-volt thermostat. Never
use a line voltage disconnect switch as a means of operating the heater. Oper-
ating by means other than a 24-volt thermostat may result in the high limit con-
trol tripping and may cause damage to the heater from excessive heat.
Connections for Reznor optional thermostats are shown by option and Size in
FIGURES 14, 15, and 16.