®
Chromalox
SERVICE REFERENCE
Installation Instructions
DIVISION
SALES
4
SECTION AR
and
(Supersedes PK405-17)
161-049287-001
REFERENCE
PK405-18
RENEWAL PARTS IDENTIFICATION
DATE
MARCH, 2004
AR (Single Phase) Industrial Thermostat
Table A – Specifications
Sensing Bulb
Temperature
Range
Approx. Capillary
Maximum
A.C. Rating
(Amps.)
NEMA I
Model*
Dia.
(In.)
Length
(In.)
Length
(Ft.)
3-3/8”
(˚F)
Style
3-1/8”
AR-115
AR-115A
AR-115C
AR-214
AR-214D
AR-215
AR-215A
AR-219
AR-219D
AR-514
AR-515
AR-515A
AR-519
AR-519D
AR-715
AR-715D
AR-719
7
2
0–100˚F
5
0.375
4-3/8
12
7
10 Amp.
480 Vac
4
5
0.250
0.375
5-5/32
4
30 Amp.
15
7
120-277 Vac
5-7/8”
60–250˚F
2
250VA
7
120-277 Vac
(Pilot Duty)
9
4
5
0.188
0.250
0.375
10-3/4
7-5/16
3-5/8
15
7
7
200–550˚F
300–700˚F
2
7
9
0.188
11-1/2
15
7
5
9
0.375
0.188
3-11/16
12
15
7
NEMA-I Model
*Models equipped with Pilot Light are designated by the suffix “P” on the Model Number.
Models equipped with Knob Cover are designated by the suffix “KC” on the Model Number.
Models equipped with both a Pilot Light and a Knob Cover are designated by the suffix “PKC” on the
Model Number.
Models installed in a moisture resistant enclosure are designated by the suffix “LT” on the Model
Number.
Pilot Light nor Knob Cover available on LT models.
2-21/32"
C
L
3/4” NPT Conduit Holes
7/8” 7/8”
4-3/32"
7-1/16”
2-21/32"
Bulb
4-7/16”
Dia.
AR-LT
5-1/16”
Length
Moisture Resistant Model
(Refer to Specifications Table A)
Figure 1
© 2010 Chromalox, Inc.
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WIRING
Figure 6
Figure 7
Figure 8 Figure 9
Figure 5
LT Models –
Note: Electrical connections should be made with generous loops
of wire – approximately 6” per lead.
A. Entrance for wiring is provided by two 3/4” NPT conduit
holes in end of enclosure. Wiring to control enclosure should
be in moisture-resistant conduit.
3. Replace cover and tighten screws.
4. Replace dial knob and dial knob cover. (NEMA-I models only).
5. Note: If load amperage or voltage rating exceeds switch rating, a
contactor must be used (see Figure 14). Contactors are available
as an optional part.
B. Remove cover by removing four hexhead screwbolts (see
Figures 8 and 9).
2. Connect wires according to wiring diagrams (Figure 11 thru 15).
Pilot
Light
Pilot Light
Pilot
Light
Line
Load
1
Load
2
1
Line
1
2
3
4
3
4
2
3
4
Line
Load
Single Phase
Load
Two Circuit
Line
Single Phase
Figure 11
Figure 12
Figure 13
Line
Pilot
Light
Three Phase
When Load
Does Not
Exceed
Three Phase
1
1
And Single
Phase When
Load Exceeds
Rating of
2
3
4
Control
Voltage
Line
2
3
4
}
Rating of
Thermostat.
Pilot
Light
Thermostat.
Load
Figure 14
Figure 15
WIRING
C
Screwdriver
Thermometer
B
Adjusting
Shaft
A
Load (Tank, vat, die or platen)
Adjusting
Set Screw
Figure 16
Figure 17
Figure 18
2. Replace knob and turn to highest temperature setting.
3. Slowly turn knob and when controls click “off”, compare the dial
reading against the thermometer reading.
4. If they do not agree –
ELECTRIC SHOCK HAZARD. Disconnect all power
before attempting to calibrate thermostat. Failure to
comply could result in personal injury.
These controls are factory calibrated to the range indicated on the
control adjustment knob.
If calibration is required, either one of two methods may be fol-
lowed:
A. Set dial knob to thermometer temperature reading and pull off
knob.
B. While holding the adjusting shaft (B) tightly, turn small cen-
ter adjusting screw (A) with small screwdriver (C) until ther-
mostat clicks “off” (see Figure 18).
Note: Always use extreme care not to damage the slot in the center
A. If accurate measurement standards are not available, the ther-
mostat can be readily adjusted to a known temperature stan-
dard such as boiling water (212˚F) (see Figure 16).
B. With the aid of an accurate thermometer or other temperature
measuring device, recalibration may be performed within the
process as in Figure 17.
adjusting screw.
C. Each quarter turn of the screw will change the calibration
approximately 30˚F:
– Clockwise to decrease temperature
– Counterclockwise to increase temperature
D. Recheck calibration and repeat process if closer calibration is
required.
For either method, the following general calibration procedures
should be followed:
1. Remove knob cover, knob and thermostat housing as per instruc-
tions 3, 4 and 5 under WIRING.
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RENEWAL PARTS IDENTIFICATION
LT-Models
NEMA-I Models
3
4
152-025660-004
Enclosure
027-057548-001
Mounting Bracket
119-114623-003
Pack Gland
1
2
3
4
Thermostat
Thermostat
Cover
Model
Sub-Assembly
Thermostat Base
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
015-013819-001
Knob
AR-115
AR-115A
AR-115C
AR-214
AR-214D
AR-215
AR-215A
AR-219
AR-219D
AR-514
AR-515
AR-515A
AR-519
AR-519D
AR-715
AR-715D
AR-719
300-048518-005
300-048518-012
300-048518-019
300-048518-001
300-048518-026
300-048518-010
300-048518-013
300-048518-002
300-048518-022
300-048518-003
300-048518-011
300-048518-014
300-048518-004
300-048518-027
300-048518-006
300-048518-029
300-048518-007
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
080-024763-001
169-019605-002
169-019605-002
169-019605-002
169-019604-001
169-019604-001
169-019604-001
169-019604-001
169-019604-001
169-019604-001
169-019604-002
169-019604-002
169-019604-002
169-019604-002
169-019604-002
169-019605-001
169-019605-001
169-019605-001
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.
1347 HEIL QUAKER BLVD., LAVERGNE, TN 37086
Phone: (615) 793-3900
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