Thomas & Betts LDAP 1200 Electrical Supply and Connections cont’d, Thermostat and Connections

14.Electrical Supply and Connections (cont’d)

Supply Wiring (cont’d)

Disconnect Switch

FIGURE 9 - Built-in

Disconnect Switch

24V Control Wiring Connections

15.Thermostat and Connections

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.

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 (FIG- URE 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 disconnect switch (See FIGURE 1A or 1B in Paragraph 7 and FIGURE 9). A circuit board (See FIGURE 13 in Paragraph 20) 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 connec- tions. The terminal strip is located on the outside of the cabinet at the front of each heat section (See FIGURE 1A or 1B in Paragraph 7). Wires from the terminal strip(s) are factory wired to the circuit board(s).

Use either an optional thermostat available with the heater or a field-supplied 24-volt thermostat. Install according to the thermostat manufacturer's instructions, paying particular attention to the requirements regarding the location of the thermostat.

Make sure that the heat anticipator setting on the thermostat is 0.6 amps (or in accor- dance with the amperage value noted on the wiring diagram of your heater).

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. Operating by means other than a 24-volt thermostat may result in the high limit control tripping and may cause damage to the heater from excessive heat.

Connections for Reznor optional thermostats are shown in FIGURE 10 for LDAP 400; in FIGURE 11 for LDAP 800; and in FIGURE 12 for LDAP 1200.

•Option CL1 - Single-Stage Thermostat, 40-80°F

•Option CL2 - Single-Stage Thermostat with Fan Switch, 40-80°F

•Option CL3 - Single-Stage Thermostat, 40-90°F

•Option CL7 - Two-Stage Thermostat (for use with optional two-stage gas valve on Size 400 or for staging heat sections on Sizes 800 and 1200)

•Option CL18 - Two-Stage Thermostat with Fan Switch (for use with optional two-stage gas valve on Size 400 or for staging heat sections on Sizes 800 and 1200)

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 14