Chromalox PK413-4 User Manual
(Supersedes PK413-3)
PK413-4
AR
161-562791-001
SEPTEMBER, 1995
4
and
Installation, Operation
RENEWAL PARTS IDENTIFICATION
Type AR-EP Industrial Explosion-Resistant
Thermostat
© 2010 Chromalox, Inc.
Specifications – Table A
2 / "
17
32
Length
(Refer to Specifications —
Table A)
2" O.D. Typ.
Capillary
2 / "
21
32
4 / "
3
32
2 / "
9
32
Dial
Stop
Post
Connect Load
Here
Shaft Shown
In "Off" Position
(Without Calibrated Cap)
Connect Power
Supply Here
/ "
11
16
Calibration Cap
White Nylon
Universal Coupler
Set Screw Lock
Figure 1
Sensing Bulb
Temperature Approx. Capillary Max.
Range Dia. Length Length A.C. Rating
Model (°F) Style (In.) (In.) (Ft.) (Amps)
AR-115EP 7
AR-115AEP 0 – 100 5 0.375 4
3
/8 2
AR-115CEP 12
AR-214EP 7
30 Amp
AR-214DEP
4 0.250 55/32
15 120-277 VAC
AR-215EP
60 – 250
7
AR-215AEP
5 0.375 4
2
AR-219EP 7
AR219DEP
9 0.188 10
3
/4
15 250 VA
AR-514EP 4 0.250 5
5
/8 7
120-277 VAC
AR-515EP 7
(Pilot Duty)
AR-515AEP
200 – 550 5 0.375 3
5
/8
2
AR-519EP
9 0.188 9
7
AR-519DEP 15
AR-715EP 5 0.375
3
11
/16
7
AR-715DEP 300 – 700 5 0.375 15
AR-719EP 9 0.188 12 7
61/2”
81/4”
4
1
/4”
4”
GENERAL
NOTICE: Type AR-EP controls are designed for temperature control service only. Because they do not fail safe, they should not be
used for temperature limiting duty.
WARNING: Users should install adequate back-up
controls and safety devices with their electric
heating equipment. Where the consequences of
failure may be severe, back-up controls are essential. Although the safety of the installation is the
responsibility of the user, Chromalox will be glad to
make equipment recommendations.
Principle of Operation — Control action of these thermostats is
provided through the principle of liquid volume change. With a
variation in temperature, the liquid in the sensing bulb expands or
contracts, causing a bellows to actuate the switching mechanism.
Housing — The control housing and cover assembly is of heavyduty cast aluminum.
Control Range — The following temperature ranges are available:
Fahrenheit
0° to 100° 200° to 550°
60° to 250° 300° to 700°
Process Temperature Differential — is variation in controlled
process temperature between maximum, when thermostat turns
OFF and minimum, when thermostat turns ON. This spread in
temperature may be minimized by —
1. Making sure control is mounted to vertical surface. (See Step
1, MOUNTING section.)
2. Avoiding excess heating capacity (oversized heaters).
3. Locating control sensing bulb in optimum position between
heat source and work.
In general, it is difficult to predict the actual operating differential of a given process. Temperature differential may be as
low as 4°F for low range controls to as high as 17°F for higher range controls since the differential is a percentage function
of the dial range.
Packing Glands — If a sealed or leak-proof connection is required
at the point where the capillary enters the oven, tank, pipe or similar equipment, an appropriate packing gland is available as an
optional part. (Model CCF-25A, CCF-25D or CCF-25E)
WIRING
MOUNTING
WARNING: Hazard of Electric Shock. Disconnect all
power before wiring or servicing this control.
Failure to comply can result in electrical shock or
electrocution.
1. Electric wiring to heater must be installed in accordance with
National Electrical Codes and local codes. WARNING: Use
copper conductors only.
2. Entrance for wiring is provided by one
3
/4” NPT hole in the top
of the housing. Wiring to control housing must be in rigid conduit also in accordance with National Electrical Codes (NEC)
for hazardous locations.
3. Set thermostat knob to OFF position and remove cover plate by
loosening and removing four (4) fastening screws (see Figure 5).
Note: Do not mount thermostat where it will be subject to vibration, shock, grease, dust, lint or corrosive vapors. Do not mount
adjacent to a large magnetic contactor, as vibration and shock will
cause thermostat to interact erratically — resulting in chattering of
the contactor.
The air temperature in and around the thermostat enclosure
should be kept as near to normal room temperature as possible...
never above 150°F.
1. Thermostat must be mount-
ed in a vertical position only.
2. Use sheet metal or wood
screws through the two
5
/16”
diameter mounting holes in
mounting lugs to mount
control (see Figure 2).
3. For controlling platen or die
temperatures, insert entire
sensing bulb into drilled holes
selected for snug slip fit.
The longer, more sensitive Style 9 bulbs should be
used for controlling air temperatures or pipe line heating.
4. NOTICE:
A. Bending or deforming
sensing bulb will alter
control calibration —
requiring recalibration after installation. See CALIBRATION section, page 3. If necessary, Style 9 bulbs can be
coiled to 1” I.D. (see Figure 3).
B. Do not kink capillary tube. The resulting constrictions in
fluid flow can destroy control function or broaden temperature differential. Minimum capillary tube bending diameter is
1
/2” I.D. (see Figure 4).
C. Any deformations of bulb or capillary that result in leakage
of fluid from control renders control inoperative.
D. Avoid passing control capillary tube through zones whose
temperature is in excess of controlled process temperature.
Erratic control or destruction of control function may result.
Lugs
Capillary
Seal
Fitting
3"
7 / "
3
8
Figure 2
Figure 3
(Sensing Bulb)
Figure 4
(Capillary Tube)
Figure 5
Do Not
Bend or Kink
Crimped End
1
/2”
Rod
1”
-2-
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