Installation, Operation
and
4
ARR
(Supersedes PK425-1)
PK425-2
161-562792-001
RENEWAL PARTS IDENTIFICATION
JANUARY, 1988
Type ARR Inverse-Action Thermostat
33/
8
”
Specifications – Table A
21/
4
”
Sensing Bulb
with 7’
Standard Capillary
Temperature
Approx.
Length
(In.)
Max.
A.C. Rating
(Amps)
Range
(°F)
Model
Style
Dia.(In.)
3
41/
169/
31/
111/
4
57/
8
”
ARR-215
60-250
60-250
5
/
8
30 Amp
120-277 Vac
(1 Pole Res.)
3
ARR-219
ARR-515
ARR-519
9
5
9
/
16
32
18
FLA-72LRA
250 Vac
3
200-550
200-550
/
8
4
125 Vac
120-277 Vac
(Pilot Duty)
3
/
16
4
Models installed in a moisture-resistant enclosure are designated by the suffix “LT” on the
model number.
Type ARR
2 3/8 " Ref.
C
211
/
"
L
16
3
/
4” NPT Conduit Holes
7
7
/
8
”
/
8
”
7
8
2 / "
71/16”
Bulb
47/16”
Dia.
51/16”
Type ARR-LT
Length
(Refer to
Moisture Resistant Model
Specifications Table A)
Figure 1
© 2010 Chromalox, Inc.
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WIRING
Figure 9
Figure 6
Figure 7
Figure 8
LT Models:
11). Note: Electrical connections should be made with gener-
ous loops of wire — approximately 6” per lead.
3. Replace cover and tighten screws.
4. Replace dial knob. (NEMA-I models only).
5. Note: If load amperage or voltage rating exceeds switch rating,
a contactor must be used. (See Figure 11) Contactors are avail-
able as an optional part.
3
A. Entrance for wiring is provided by two /4” NPT conduit
holes in end of housing. Wiring to control housing should
be in moisture-resistant conduit.
B. Remove cover by removing four hexhead screwbolts. (See
Figure 8 and 9)
2. Connect wires according to wiring diagrams (Figures 10 and
Pilot
Light
Pilot
Light
Figure 11 — Single phase loads when load exceeds rating of thermostat and
three phase loads.
Figure 10 — Single phase loads when load does not
exceed rating of thermostat.
CALIBRATION
Thermometer
Load (Tank, vat, die or platen)
Figure 14
Figure 12
Figure 13
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 —
CAUTION: Hazard of Electric Shock. Extreme care
should be exercised during calibration adjustments
because of shock hazard due to exposed electrical
terminals.
These controls are factory calibrated to the range indicated on
the control adjustment knob.
A. Set dial knob to thermometer temperature reading and pull
off knob.
B. While holding the adjusting shaft (B) tightly, turn small
center adjusting screw (A) with small screwdriver (C) until
thermostat clicks “off”. (See Figure 14)
If calibration is required either one of two methods may be
followed:
1. If accurate measurement standards are not available, the ther-
mostat can readily be adjusted to a known temperature stan-
dard such as boiling water (212°F). (See Figure 12)
2. With the aid of an accurate thermometer or other temperature
measuring device, recalibration may be performed within the
process as in Figure 13.
For either method the following general calibration procedures
should be followed.
1. Remove knob and thermostat housing as per instructions under
WIRING.
Note: Always use extreme care not to damage the slot in the
center adjusting screw.
C. Each quarter turn of the screw will change the calibration
approximately 30°F:
— Clockwise to decrease temperature
— Counter clockwise to increase temperature
D. Recheck calibration and repeat process if closer calibration
is required.
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RENEWAL PARTS IDENTIFICATION
NEMA-I Models
LT Models
015-013696-002
Base
152-010971-001
Cover
027-05748-001
Mounting Bracket
152-025660-004
Housing
1
2
027-05748-001
Mounting Bracket
119-114623-003
Packing Gland
213-018509-002
Pilot Light
1
2
Model
Dial Knob
Thermostat Sub-Assembly
ARR-215
ARR-219
ARR-515
ARR-519
169-046036-001
169-046036-001
169-046036-002
169-04636-002
300-057437-001
300-057437-002
300-057437-003
300-057437-004
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
1347 HEIL QUAKER BLVD., LAVERGNE, TN 37086
Phone: (615) 793-3900
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