Chromalox PK413-4 specifications Calibration

Figure 12

Dial

Stop Post

Stop

Tab

WIRING

Figure 6

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.

6.Replace white shaft coupler.

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 resistance should be

encountered. If satisfied, that proper engagement of

shaft coupler is accom- plished; finish tightening

cover screws.

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

			Pilot Light		Pilot Light
Pilot
Light					Load
	1		Load		1
	2	Line	1
				Line	2
	3		2			Line
					3
	4		3
					4
			4
Load
					Load
	Single Phase
			Single Phase
					Two Circuit
	Figure 7		Figure 8		Figure 9
Line				Three Phase	Pilot
				when Load	Light
	1			Does Not	1	}
				Exceed
	2	Control	Three Phase	Rating of	2		Line
Contactor				Thermostat	3
	3	Voltage	and Single
	4		Phase when		4
			Load Exceeds
	Pilot		Rating of
			Thermostat
	Light
Load
	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.

For either method, the following general calibration procedures should be followed.

-3-

Figure 13