White Rodgers 1F58 Adjusting Stage 2 Heat Anticipator, Calibration Adjustment

ADJUSTING STAGE 2 HEAT ANTICIPATOR

This thermostat is equipped with two anticipators. The anticipator for stage 1 heat and cool is fixed and does not require any adjustments. The stage 2 anticipator is adjust- able and must be set to the current draw of the component it is controlling.

To determine the correct stage 2 anticipator setting, measure the current draw of the stage 2 (auxiliary heat) relay. You may use the following procedure to determine current draw.

The stage 2 heat anticipator is located on the thermostat base. Adjust the anticipator by turning the lever until the pointer is set on the correct anticipator setting determined above (see fig. 6). If additional adjustments are neces- sary, they may be made as follows (adjust the anticipator 1⁄2 division at a time; for example, from 0.6 to 0.55).

1.If shorter heating cycles are desired, set the anticipa- tor to a slightly lower setting.

2.If longer heating cycles are desired, set the anticipa- tor to a slightly higher setting.

1.	Loosely wrap exactly 10 coils of thermostat wire
	around the jaws of a split-jaw induction-type current
	meter (see fig. 5).
2.	With the subbase correctly wired to the heat pump
	system, attach one end of the 10-turn coil to terminal
	R and attach the other end to terminal W1.
3.	With the heat pump system power on, center the coil

10 turns of wire

Split jaw

current meter

on the meter jaws and read the current draw of the

stage 2 heat relay on the meter and divide the reading

by 10. This is the value that should be set on the

adjustable anticipator.

Example:

Meter reads 6.0 amp

Figure 5. Current meter

.3	.25
.4
N G E		R
O
L			.2
		C
.5		Y
			.18

10 turns of wire

= 0.6 amp anticipator setting

.6	S
.8 1.0	.15

4.Turn power to heat pump system off, then remove coil leads from the subbase and move system switch to OFF.

Arrow points to the	Move this lever to
	adjust heat
matched current rating	anticipator
of the primary control

Figure 6. Anticipator adjustment

CALIBRATION ADJUSTMENT

This thermostat has been carefully adjusted at the factory and should not require recalibration.

A few degrees difference between the indicator setting of the thermostat and actual room temperature is not consid- ered important. If the disagreement is appreciable, how- ever, first make sure that the thermostat is properly located and leveled. Then, if recalibration still seems necessary, proceed as follows:

1.Move temperature adjustment lever to a setting about 5° above room temperature.

2.Remove thermostat cover. Slip 7⁄32” wrench onto hex nut beneath bimetal and hold temperature adjust- ment lever stationary. Turn hex nut clockwise until mercury shifts to right end of tube (see fig. 7).

3.Move temperature adjustment lever to lowest setting.

4.Replace thermostat cover. Wait 10 minutes for bi- metal temperature to stabilize. Don’t stand near ther- mostat during this period as your breath and body heat will affect temperature of bimetal.

5.Move temperature adjustment lever to correspond to actual room temperature. Then remove thermostat cover.

6.Slip 7⁄32” wrench onto hex nut, holding temperature adjustment lever

	Temperature
	adjustment
Bimetal	lever

7⁄32” calibration

wrench

Figure 7. Calibrating thermostat

5