Chromalox PK407-3 user manual

Summary of the content on the page No. 1

Installation,Operation
4 AR
and
(Supersedes PK407-3) PK407-4
RENEWAL PARTS IDENTIFICATION 161-562793-001
MARCH, 2004
Type AR Industrial Thermostat
(Three Phase)
2-21/32"
4-3/32"
Bulb
Dia.
Length
(Refer to
Specifications Table A)
Specifications — Table A
Sensing Bulb
with 7’
Standard Capillary
Temperature Approx. Max.
Range Dia. Length A.C. Rating
Model* (°F) Style (In.) (In.) (Amps)
3 1
AR-2153 60-250 5 /8 4 /4
3 3
AR-2193 60-250 9 /16 10 /4
30 Amps
3 1
@ 277 Volts
AR-5153 200-550 5 /8 3 /4
3
2-

Summary of the content on the page No. 2

GENERAL NOTICE: Type AR Thermostats are designed for temperature Process Temperature Differential — is variation in controlled control service only. Because they do not fail safe, they should not process temperature between maximum, when thermostat turns be used for temperature limiting duty. 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). The system designer is respo

Summary of the content on the page No. 3

WIRING 6. Connect wires according to wiring diagrams (Figures 8 thru 12). Note: Electrical connections should be made with gener- ous loops of wire — approximately 6” per lead. ELECTRIC SHOCK HAZARD. Disconect all power to 7. Replace cover, tighten screws, replace dial knob and dial knob heater before installing or servicing thermostat. cover. Failure to do so could result in personal injury or 8. Note: If load amperage or voltage rating exceeds switch rating, property damage. Thermostat must be

Summary of the content on the page No. 4

CALIBRATION (cont’d.) For either method the following general calibration procedures B. While holding the adjusting shaft (B) tightly, turn small should be followed. center adjusting screw (A) with small screwdriver (C) until 1. Remove knob cover, knob and thermostat housing as per thermostat “clicks” (see Figure 12). instructions 3, 4 and 5 under WIRING. Note: Always use extreme care not to damage the slot in the 2. Replace knob and turn to highest temperature setting. center adjusting screw. 3