Chromalox Luh-tk1 Guide

The following procedure contains instructions for installing ther-

mostat kits LUH-TK1 and LUH-TK2 in LUH-02 through LUH-45

Heaters.

ELECTRIC SHOCK HAZARD. Disconnect all power

before installing thermostat kit. Failure to do so

could result in personal injury or property damage.

Heater must be installed by a qualified person in

accordance with the National Electrical Code,

NFPA 70.

Hazard of Electric Shock. Disconnect all power

befor installing. This kit must be installed by a

qualified person.

Thermostat Kits

Model Number LUH-TK1 (SPST)

Model Number LUH-TK2 (DPST)

For field installation only in LUH-02 through LUH-45 heaters

SPECIFICATIONS

1. Temperature Range: 40˚F to 90˚F.

2. Differential: 5˚F.

3. Non-inductive Rating:

24V @ 25 Amperes

120V @ 25 Amperes

240V @ 25 Amperes

277V @ 22 Amperes

(Supersedes PF448-6)

PF448-7

LUH

161-057821-001

JULY, 2002

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 



DATE

SALES

REFERENCE

DIVISION SECTION

Chromalox

LO HI

OFF

Chromalox

GENERAL

INSTALLATION

1. Peel off “Chromalox” decal located at the bottom right cor-

nerof the front of the heater. Removal of this label will reveal

the thermostat shaft hole and two mounting holes which are

factory drilled on all heaters. (See Figure 1).

2. Open hinged access door at bottom of heater and insert ther-

mostat through the shaft hole in the front cover, assuring that

thermostat leads are toward the inside of the case. (See Figure

2.) Align mounting holes and fasten with the mounting screws

provided with the kit.

3. Refer to specific wiring diagram figure number (from Table 1,

page 2) for electrical connections of the thermostat leads and

follow directions under corresponding figure number.

Complete all electrical connections indicated before proceed-

ing to step 4.

4. Insert bulb clip in factory drilled hole located on heater back.

(See Figure 3.)

5. Feed thermostat capillary (be careful not to kink or make any

sharp bends) out through the factory drilled hole located on

heater back directly beneath motor conduit. Snap the tip of the

thermostat bulb into the bulb clip. (See Figure 3.)

6. Make a lengthwise cut with knife through the rubber grommet

provided and insert the grommet over the capillary.

7. Install the grommet into factory drilled hole on back of heater.

(See Figure 3.)

8. Install new label over the thermostat shaft. Install thermostat knob.

Wiring

Thermostat Diagram Built-in Built-in

Model No. Volts Phase kW Kit No. Figure No. Contactor Transformer

LUH-D-02-81 208 1 2.6 LUH-TK-1 5 YES NO

LUH-D-02-21 240 1 2.6 LUH-TK-1 5 YES NO

LUH-D-02-71 277 1 2.6 LUH-TK-1 5 YES NO

LUH-D-04-81 208 1 4 LUH-TK-1 5 YES NO

LUH-D-04-83 208 3 4 LUH-TK-1 4 YES NO

LUH-D-04-21 240 1 4 LUH-TK-1 5 YES NO

LUH-D-04-23 240 3 4 LUH-TK-1 4 YES NO

LUH-D-04-71 277 1 4 LUH-TK-1 5 YES NO

LUH-D-04-43 480 3 4 LUH-TK-1 6 YES YES

LUH-D-05-81 208 1 5 LUH-TK-1 5 YES NO

LUH-D-05-83 208 3 5 LUH-TK-1 4 YES NO

LUH-D-05-21 240 1 5 LUH-TK-1 5 YES NO

LUH-D-05-23 240 3 5 LUH-TK-1 4 YES NO

LUH-D-05-71 277 1 5 LUH-TK-1 5 YES NO

LUH-D-05-43 480 3 5 LUH-TK-1 6 YES YES

LUH-D-07-81 208 1 7.5 LUH-TK-1 5 YES NO

LUH-D-07-83 208 3 7.5 LUH-TK-1 4 YES NO

LUH-D-07-21 240 1 7.5 LUH-TK-1 5 YES NO

LUH-D-07-23 240 3 7.5 LUH-TK-1 4 YES NO

LUH-D-07-71 277 1 7.5 LUH-TK-1 5 YES NO

LUH-D-07-43 480 3 7.5 LUH-TK-1 6 YES YES

LUH-D-10-81 208 1 10 LUH-TK-1 5 YES NO

LUH-D-10-83 208 3 10 LUH-TK-1 4 YES NO

LUH-D-10-21 240 1 10 LUH-TK-1 5 YES NO

LUH-D-10-23 240 3 10 LUH-TK-1 4 YES NO

LUH-D-10-43 480 3 10 LUH-TK-1 6 YES YES

LUH-D-12-83 208 3 12.5 LUH-TK-1 4 YES NO

LUH-D-12-23 240 3 12.5 LUH-TK-1 4 YES NO

LUH-D-12-43 480 3 12.5 LUH-TK-1 6 YES YES

LUH-D-15-83 208 3 15 LUH-TK-1 4 YES NO

LUH-D-15-23 240 3 15 LUH-TK-1 4 YES NO

LUH-D-15-23 480 3 15 LUH-TK-1 6 YES YES

LUH-D-20-23 240 3 20 LUH-TK-1 4 YES NO

LUH-D-20-43 480 3 20 LUH-TK-1 6 YES YES

LUH-D-25-43

To 480 3 25 - 45 LUH-TK-1 6 YES YES

LUH-D-45-43

Heaters with Optional

All Voltages 1 2.6, 4, 5, LUH-TK-1 8 YES NO

External 120V Controls

7.5, 10 LUH-TK-2 10

Heaters with Optional

4, 5, 7.5, 10, 12, LUH-TK-1 9

External 120V Controls

All Voltages 3 12.5, 15, 20, 25, LUH-TK-2 11 YES NO

30, 35, 40, 45

WIRING DIAGRAMS

Disconnect Access

Rubber Grommet

Thermostat Cappilary

Thermostat Bulb

Bulb Clip

Thermostat

Leads

Mounting

Screws

INSTALLATION

Figure 2 – Bottom View Figure 3

Figure 1 – Bottom View