ELECTRIC SHOCK HAZARD. Disconnect all power before installing or servicing heater. Failure to do so could result in personal injury or property dam- age. Heater must be installed by a qualified person in accordance with the National Electrical Code, NFPA 70.
ELECTRIC SHOCK HAZARD. Any installation involv- ing electric heaters must be performed by a quali- fied person and must be effectively grounded in accordance with the National Electrical Code to eliminate shock hazard.
1. Use heater only on the voltage and frequency specified on the nameplate.
2.All wiring should be done in accordance with local codes and the National Electrical Code by a qualified person as defined in the NEC.
3.Two knockouts are provided on the back of the heater for wire entry. See Figure 6 for location of knockouts.
4.Branch circuit wire for connection to heater must be at least 60°C wire.
5.The bottom access door is hinged. There is one screw that must be loosened to gain access (Figure 3). This screw is the captive type; do not try to remove it.
6.A ground terminal is provided near the power terminal board. The ground wire should be connected before other connections are made.
7.Stripped wire leads are supplied to be connected to accept the correct size power supply wire. Copper wire rated at 600V and 60°C is satisfactory for the heater branch circuit.
8.Electrical accessories, either kits or factory-installed options, are shown connected by a dash line on the heater wiring diagram.
9.Wiring connections are to be made on designated wire leads as
shown in the wiring diagrams located inside the access door. POWER DISCONNECT SWITCH (Available as a kit or factory installed option.) This switch (Figure 7) disconnects the power to the power leads when the handle is placed in its off position.
1.Use copper conductor supply wire only when connecting to the power line.
2.Connection to the switch pigtails should be made with com- pression connectors and the joint should be then well insulated.
Power
Disconnect
SwitchContactor
| To | L1 | S1 | |
| L2 | S2 | |
| Power | See Notes |
| | |
| Supply | L3 | S3 | |
See
Note 2
Notes:
1.This illustration shows wiring hook up for three phase service. Remove lead wires marked L2 and S2 when using single phase power service.
2.For units without contactors, disconnect switch is to be wired to lead wires on heater power.
3.Use copper supply wire only with this switch.
Figure 7
Power Disconnect Switch Wiring Diagram
3.Consult the local wiring code in your area.
SUMMER FAN SWITCH (MOUNTED ON FRONT OF HEATER). When the switch handle is pointing toward the “SUM- MER” position, the fan will run continuously. When the switch handle is pointing toward the “WINTER” position, the fan will run only when the heating elements are hot.
REMOTE FAN SWITCH (MANUAL SWITCH-LINE VOLT- AGE). 480V requires an additional relay. The wall switch is packed in the wiring compartment.
The remote fan switch is mounted external and remote from the LUH unit heater. The voltage of the remote fan switch is the same as the supply voltage to the LUH heater.
1.Use 14 gauge copper, NEC Class 1, 600V rated insulated wire. Wiring must meet all Local and NEC requirements for 480V service.
2.Install the remote fan switch in standard wall box in any con- venient location that is protected from traffic or other acci- dental damage.
3.Connect the 14 gauge copper field wire to the switch lead wires with suitable connectors.
REMOTE FAN SWITCH (USED WITH 24 or 120-VOLT RELAY) (Available as a kit or factory installed option). The wall switch is packed in the wiring compartment.
1.Use 18 gauge (min.) NEC Class 1, 600V wiring that meets all Local and NEC requirements.
2.Install the wall switch in a standard wall box in any convenient location that is protected from traffic or other accidental damage.
3.Connect the field wire to the switch lead wires with suitable connectors.
15/16”
Chromalox®
Figure 8 — Thermostat Location, Front View
OPTIONAL THERMOSTAT (LUH-TK)
Heaters can be equipped with an optional thermostat of the Bulb and Capillary type for automatic temperature control (Figure 8). The thermostat controls the heating elements and fan simulta- neously to achieve set temperature.
The “Lo” setting of the thermostat is approximately 40°F, and the “Hi” setting is approximately 90°F.
CONTROL VOLTAGE WIRING - EXTERNAL REMOTE THERMOSTATS AND FAN SWITCHES
ELECTRIC SHOCK HAZARD. Line voltage is present on some of the terminals. Always disconnect the power from the heater before making any connec- tions.
1.Use 600V, NEC Class 1 insulated wiring with a minimum gauge of 18 for thermostats and a minimum gauge of 14 for line voltage motor switch (remote fan switch without relay).
2.The thermostat should be located in the area to be heated on an inside wall. The thermostat should not be exposed to drafts, sunlight, radiation from hot objects, or in a direct line with the discharge from the unit heater.
3.Install the thermostat approximately 5 feet above the floor line.
4.Install the remote fan switch in any convenient location that is protected from traffic or likely accidental damage.
5.Internal optional controls are shown on the unit heater wiring diagrams by a dash line.
Use wiring diagrams as listed for model number on (A through X), pages 5, 6 and 9.
For installation and optional control kits, refer to instruction sheets listed on page 8.
