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

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

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

Connect single pole thermostat blue lead
(BL) to heater lead C1 and black lead
(BLK) to C2 using wire nut provided.

Connect single pole thermostat blue lead
(BL) to heater lead C1 and black lead
(BLK) to C2 using wire nuts provided.

Connect single pole thermostat blue lead
(BL) to heater lead C1 and black lead
(BLK) to C2 using wire nuts provided.

Connect single pole thermostat blue lead
(BL) to heater lead C1 and black lead
(BLK) to C2 using wire nuts provided.

NOTE: One element is omitted on LUH-D-02

Connect single pole thermostat blue lead
(BL) to heater lead C1 using the wire nut
provided. Remove the C1 wire marker
from the heater lead and attach to thermo­stat black lead (BLK).

Connect single pole thermostat blue lead
(BL) to heater lead C1 using the wire nut
provided. Remove the C1 wire marker
from the heater lead and attach to thermo­stat black lead (BLK).

Motor

Heating

Elements

Overheat

Cutout

Contactor

C1

C2

BL

BLK

L1 L2 L3

LUH-TK-1
Single Pole
Thermostat

Ground

Motor

Heating

Elements

Overheat

Cutout

Contactor

C1

C2

BL

BLK

L1 L2

LUH-TK-1
Single Pole
Themostat

Ground

Motor

Heating

Elements

Overheat

Cutout

Contactor

C1

C2

BL

BLK

L1 L2 L3

LUH-TK-1
Single Pole
Thermostat

Transformer

Fuses

Ground

Figure 4

208, 240V — 3ø — 4, 5, 7.5, 10, 12.5 & 15 kW

240V — 3ø — 20 kW

Figure 5

208, 240, 277V — 1ø — 2.6, 4, 5, 7.5 & 10 kW

Figure 6

480V — 3ø — 4, 5, 7.5, 10, 12.5, 15,

20, 25, 30, 35, 40 & 45 kW

Motor

Heating

Elements

Overheat

Cutout

Contactor

C1

C2

BL

BLK

L1 L2

LUH-TK-1
Single Pole
Thermostat

Transformer

Fuses

Ground

Figure 7

1ø Heaters with Optional Control Transformer

Motor

Heating

Elements

Overheat

Cutout

Contactor

C1

BL

BLK

C2 L1 L2

LUH-TK-1
Single Pole
Thermostat

Remove C1
Tag from
Existing
Lead

Tag Lead
as C1

Ground

C1

Figure 8

1ø Heaters with Optional External 120 Volt Control

Motor

Heating

Elements

Overheat

Cutout

Contactor

C1

BL

BLK

C2 L1 L2 L3

LUH-TK-1
Single Pole
Thermostat

Remove C1
Tag from
Existing
Lead

Tag Lead
as C1

Ground

C1

Figure 9

3ø Heaters with Optional External 120 Volt Control

WIRING DIAGRAMS

LUH-TK-1 Components KiT LUH-TK-2 Components Kit

Part Number* Part Number*

Thermostat 300-049197-003 300-049197-004

Screws 248-049282-021 (2) 248-049282-021 (2)

Rubber Grommet 135-075436-008 135-075436-008

Label Decal 170-049279-002 170-049279-002

Bulb Clip 059-304558-001 059-304558-001

Knob 169-049278-001 169-049278-001

Wire Nuts 070-075468-004 (2) 070-075468-004 (2)

*Number in Parentheses ( ) indicates the quantity of that part required.

Motor

Heating

Elements

Contactor

Overheat

Cutout

Remove C1
Tag from
Existing
Lead

C1

LUH-TK-2
Double Pole
Thermostat

L2L1 Ground

BLK

BLK
Tag Leads as
C1 and C2

C1 C2

Motor

Heating

Elements

Contactor

Overheat

Cutout

Remove C1
Tags from
Existing
Lead

C1

LUH-TK-2
Double Pole
Thermostat

L2L1 L3 Ground

BLK

BLK
Tag Leads as
C1 and C2

C1 C2

2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: [phone] www.chromalox.com

TA - P0 - EF
Litho in U.S.A.

Figure 10
Using 2 Pole Thermostat on 1ø Heaters
with Optional External 120 Volt Control

Figure 11
Using 2 Pole Thermostat on 3ø Heaters
with Optional External 120 Volt Control

RENEWAL PARTS IDENTIFICATION

Limited Warranty:

Please refer to the Chromalox limited warranty applicable to this product at

http://www.chromalox.com/customer-service/policies/termsofsale.aspx.