Chromalox LUH-TK1, LUH-TK2 Installation, Operation & Parts
The following procedure contains instructions for installing thermostat 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.
© 2010 Chromalox, Inc.
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
4
DATE
SALES
REFERENCE
DIVISION SECTION
Chromalox
®
LO HI
OFF
Ch romalo x
R
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 proceeding 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
Thermostat
Leads
Mounting
Screws
INSTALLATION
Figure 2 – Bottom View
Figure 3
Figure 1 – Bottom View
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