Chromalox PK405-18 installation instructions LT Models, If they do not agree

WIRING

Figure 5

Figure 6

Figure 7

Figure 8 Figure 9

LT Models –

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.

B.Remove cover by removing four hexhead screwbolts (see Figures 8 and 9).

2.Connect wires according to wiring diagrams (Figure 11 thru 15).

Note: Electrical connections should be made with generous loops of wire – approximately 6” per lead.

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.

Pilot

Light

Load

Figure 11

1

2 Line

3 4

Single Phase

	Pilot Light
	Load
	1
	2	Line
	3
	4
Figure 12	Single Phase

Figure 13

Pilot Light

LoadLine

1

2

3

4

LoadLine

Two Circuit

	Line
	Pilot
	Light
Figure 14	Load

1

2

3 4

Control Voltage

Three Phase

And Single

Phase When

Load Exceeds

Rating of

Thermostat.

Three Phase

When Load

Does Not

Exceed

Rating of

Thermostat.

Figure 15

Pilot

Light

1

2

3 4

}Line

WIRING

Figure 16

Thermometer

Load (Tank, vat, die or platen)

Figure 17

C

Screwdriver

B

Adjusting

Shaft

A

Adjusting

Set Screw

Figure 18

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.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.

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.

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 –

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 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.