Installation, Operation
and
4
AR
(Supersedes PK413-3)
PK413-4
161-562791-001
RENEWAL PARTS IDENTIFICATION
SEPTEMBER, 1995
Type AR-EP Industrial Explosion-Resistant
Thermostat
41/
4
”
4”
Connect Power
Supply Here
81/
4
”
61/
2
”
Connect Load
Here
Dial
Stop
Post
4 3/32"
Shaft Shown
In "Off" Position
(Without Calibrated Cap)
2 9/32"
221/32"
217
/
32
"
Specifications – Table A
Sensing Bulb
Temperature
Range
(°F)
Approx. Capillary
Length Length
Max.
A.C. Rating
(Amps)
Dia.
(In.)
Model
Style
(In.)
(Ft.)
AR-115EP
AR-115AEP
AR-115CEP
AR-214EP
AR-214DEP
AR-215EP
AR-215AEP
AR-219EP
AR219DEP
AR-514EP
7
11
16
/
"
Calibration Cap
0 – 100
5
0.375
43/
8
2
White Nylon
Universal Coupler
12
7
30 Amp
120-277 VAC
4
5
0.250
0.375
55/
32
Set Screw Lock
15
7
60 – 250
4
2
Length
(Refer to Specifications —
Table A)
7
9
4
0.188
0.250
103/
55/
4
15
7
250 VA
120-277 VAC
(Pilot Duty)
8
AR-515EP
7
200 – 550
300 – 700
5
9
0.375
0.188
35/
8
AR-515AEP
AR-519EP
AR-519DEP
AR-715EP
AR-715DEP
AR-719EP
2
7
9
15
7
5
5
9
0.375
0.375
0.188
311/
16
Figure 1
15
7
12
© 2010 Chromalox, Inc.
WIRING
7. WARNING:It is possible to replace enclosure
cover with adjustment knob 180 rotational
degrees out of alignment resulting in large cali-
bration errors. To avoid this, carefully follow
these procedures.
A. Be sure that thermostat shaft is fully counter-clockwise (see
Figure 12). With thermostat knob held in the indicated OFF
position, carefully replace enclosure cover while feeling for
proper engagement of
shaft coupling.
B. With cover screws replaced
and moderately fastened,
check for full rotation of
dial knob. Note: Mild shaft
Dial
resistance should be
encountered. If satisfied,
that proper engagement of
shaft coupler is accom-
plished; finish tightening
cover screws.
Stop
Post
Figure 6
Stop
Tab
4. Remove white shaft coupler for safe-keeping while making
wiring connections (see Figure 6).
5. Connect wires according to wiring diagrams (Figures 7 thru 11).
Note: Electrical connections should be made with generous
loops of wire — approximately 6” per lead.
8. Note: If load amperage or
voltage rating exceeds switch
rating, a contactor must be
used. Contactor and wiring to
be supplied by customer (see
Figure 12
6. Replace white shaft coupler.
Pilot Light
Pilot Light
Pilot
Light
Load
1
2
3
4
Load
1
2
3
4
1
Line
Line
Line
2
3
4
Load
Load
Single Phase
Single Phase
Two Circuit
Figure 8
Figure 9
Figure 7
Line
Contactor
Load
Pilot
Light
Three Phase
when Load
Does Not
Exceed
1
2
3
4
1
2
3
4
Rating of
Line
Three Phase
Control
Voltage
Thermostat
}
and Single
Phase when
Load Exceeds
Rating of
Pilot
Light
Thermostat
Figure 10
Figure 11
CALIBRATION
WARNING: Hazard of Electric Shock. Extreme care
should be exercised during calibration adjustments
because of shock hazard due to exposed electrical
terminals. Failure to comply can result in electrical
shock or electrocution.
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
followed.
1. If accurate measurement standards are not available, the ther-
mostat can readily be adjusted to a known temperature standard
such as boiling water (212°). See Figure 13.
2. With the aid of an accurate thermometer or other temperature
measuring device, recalibration may be performed within the
process as in Figure 14.
Figure 13
For either method, the following general calibration procedures
should be followed.
-3-
CALIBRATION
DANGER: Calibration will involve exposure of inter-
nal control terminals to ambient conditions during
some part of the recalibration procedure.
Combustible materials which cause hazardous
conditions must not be present during recalibra-
tion process — otherwise explosion may result.
Thermometer
1. Heat water bath or the equipment in which the control is
installed (tank, die, platen or machine) to the selected calibra-
tion temperature. The entire sensing bulb and at least one foot
of its capillary tube are to be exposed to calibrating tempera-
ture. With thermostat energized, allow process or bath to reach
setpoint. This is accomplished when thermostat begins cycling
action.
2. Compare adjustment knob cut off temperature indication
against actual temperature to which sensing bulb is exposed.
Figure 15 shows example of a control knob showing a control
indication of 250°F when true process temperature measured
230°F. In this example, the control knob must be rotated 20°
counterclockwise to bring the 230°F knob marking under the
index mark in order to recalibrate the control.
Load (Tank, vat, die or platen)
Indicated Temp.
Figure 14
True Temp
250
3. Without disturbing the shaft setting, loosen the thermostat
knob set-screw and re-align dial setting accordingly. Retighten
knob set-screw.
4. Recheck for thermostat operation as per steps 2 and 3 and make
further calibration adjustment if indicated.
5. Recheck of thermostat operation following final adjustment
completes the calibration procedure.
IMPORTANT: Under no circumstances must the temperature
range, and in particular, the maximum temperature setting of con-
trol be increased above maximum temperature indicated on control
nameplate. Such changes voids U.L. listing of the control.
Figure 15
THERMOSTAT SUB ASSEMBLY REPLACEMENT
1. Before removing enclosure cover, turn thermostat knob to the
OFF position (counterclockwise). Place a piece of masking
tape over the knob to keep it in the OFF position.
2. Remove the enclosure cover by removing four fastening
screws (Figure 5).
3. Remove the white shaft coupler for safe-keeping.
4. Remove the thermostat mounting screws (2).
5. Loosen the capillary-seal retaining cap set screws and then
remove the retaining cap.
11. Recheck for proper capillary length (external to enclosure) and
adjust if necessary.
12. Align spacer plate and replacement thermostat to mounting
holes in the bottom of enclosure using mounting screws (2 –
#10-32 x 3/
Lg.) to secure thermostat to enclosure.
8
13. Slide the capillary seals into the capillary fitting making sure
the capillary is positioned in the center groove of the seals.
WARNING:If capillary is not located in the cen-
ter groove properly, damage to the capillary will
result, rendering the thermostat inoperable or
unreliable.
Note: Do not remove the entire capillary seal fitting from the
enclosure.
6. Remove the capillary seals and thermostat from the enclosure.
7. Remove the calibration cap (Figure 1) and insert pin from the
old thermostat. Rotate the position of the calibration cap, for
use in the next step.
14. Replace capillary seal retaining cap and tighten set screws to
lock in position.
Note: Per the NEC, all threaded connections in a hazardous
environment must be tightened sufficiently to engage five full
threads.
8. With replacement thermostat in the OFF position (shaft complete-
ly counterclockwise), install insert pin and calibration cap. Install
calibration cap with same orientation as noted in step 7 above.
9. If excess capillary, on old thermostat, had been coiled in enclo-
sure, it may be necessary to coil an equal amount on replace-
ment thermostat per step 4D mounting instructions.
10. After proper capillary length is obtained on replacement ther-
mostat, insert capillary in the enclosure and thru the capillary
seal fitting.
15. Rewire replacement thermostat per appropriate wiring dia-
grams (Figures 7 thru 11).
16. Replace the white nylon coupling on the calibration cap and
enclosure cover per step 7 of the wiring section.
17. Replacement thermostat control should be monitored to insure
proper operation. If calibration is required, see the calibration
section for instructions.
-4-
RENEWAL PARTS IDENTIFICATION
Thermostat
Sub Assembly
Model
Control Knob
AR-115EP
AR-115AEP
AR-115CEP
AR-214EP
AR-214DEP
AR-215EP
AR-215AEP
AR-219EP
AR-219DEP
AR-514EP
AR-515EP
AR-515AEP
AR-519EP
AR-519DEP
AR-715EP
AR-715DEP
AR-719EP
300-027566-001
300-027566-014
300-027566-012
300-027566-004
300-027566-015
300-027566-009
300-027566-007
300-027566-002
300-027566-016
300-027566-005
300-027566-008
300-027566-006
300-027566-003
300-027566-018
300-027566-010
300-027566-011
300-027566-013
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
Parts Common to All
Part
Part Number
Capillary Seal Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119-053954-001
White Nylon Coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .079-512424-001
-5-
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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