White Rodgers 1050 Dial Settings, Setting the Round Dial, Setting the Square Dial

DIAL SETTINGS

When using this control as an exact replacement, use same dial settings as for old control.

A.SETTING THE ROUND DIAL:

Set the round dial for “N” initially. This will enable minor additional adjustments to be made later if the specific instal- lation should require it (refer to “C”.)

B.SETTING THE SQUARE DIAL:

Select the proper square dial setting from table 1 or 2 below. For the majority of installations, the dial setting selected should provide satisfactory boiler operation without requiring any further dial adjustments. When required, additional adjustments may be made as explained in “C”.

OUTDOOR
DESIGN		SUGGESTED SQUARE DIAL SETTING
TEMPERATURE
20°F (-7°C)	3		4.5	--	--	--	--
10°F (-12°C)	2.5		3.5	5	--	--	--
0°F (-17°C)	2		3	4	5	--	--
-10°F (-23°C)	1.5		2.5	3.5	4.5	5	--
-20°F (-29°C)	1		2	3	4	4.5	5
	140	160		180	200	220	240
	(60)	(71)		(82)	(93)	(104)	(116)
	BOILER DESIGN TEMPERATURE °F (°C)

SQUARE DIAL

Adjusts for heat-loss of specific installation

ROUND DIAL Adjusts comfort level required

Adjustment screw

for changing setting

of square dial

Table 2 shows suggested square dial settings for various reset ratios. The first number of the reset ratio refers to the outdoor bulb, the second number refers to the inside bulb. For 1-1/2 to 1 ratio, for example, each 1-1/2°F drop in outdoor temperature will cause a 1°F increase in boiler water.

Reset Ratio	Suggested Square
	Dial Setting
1.5 to 1	1
1 to 1	2.5
1 to 1.5	4.5

C.ADDITIONAL ADJUSTMENTS:

If, due to system variables such as heat loss of building, boiler size, etc., the square dial setting selected in “B” does not give desired boiler temperatures, additional adjustments may be made as follows:

Round Dial – One division change in the round dial setting changes boiler water temperature about 5° at all outdoor temperatures.

Square Dial – Changing the square dial setting 1/2 division (3 full revolutions of adjusting screw) changes boiler water temperature about 10° at low outdoor temperatures (0° to -20°)

CONDITION	SUGGESTED ADJUSTMENT
Area too cool at low	Raise square dial setting.
outdoor temperatures.
Area too warm at low	Lower square dial setting.
outdoor temperatures.
Area too cool at all	Raise round dial setting. (Also
outdoor temperatures	raise square dial setting if round
	dial has been set to “warmest”
	setting.)
Area too warm at all	Lower round dial setting. (Also
outdoor temperatures	lower square dial setting if
	necessary.)

4