White Rodgers 1127 - Manuel (Page 3)

3
SETTING THE CONTROL
CONTROLS WITH ADJUSTABLE DIFFERENTIAL
The left-hand indicator points to the temperature at which the
contacts open on high limit and low limit applications. On
circulator applications, the left-hand indicator points to the
temperature at which the circulator will start.
On combination low limit and circulator applications, the
left-hand indicator points to the temperature at which the low
limit stops the burner and permits the circulator to run.
1. Insert screwdriver in the centre slot and turn the dial until the
right hand indicator (B) points to the lowest temperature of the
cycle.
2. Turn the differential adjusting screw (C) until the left hand
indicator (D) points to the highest temperature of the cycle.
CONTROLS WITH FIXED DIFFERENTIAL
The fixed indicator points to the temperature at which the
contacts open on high limit and low limit applications. On
circulator applications, the fixed indicator points to the tem-
perature at which the circulator will start.
On combination low limit and circulator applications, the
fixed indicator points to the temperature at which the low limit
stops the burner and permits the circulator to run.
Insert screwdriver in center slot and turn the dial until the fixed
indicator (B) points to the highest desired temperature of the
cycle.
“B” FIXED INDICATOR
(CUT-IN POINT)
“C” DIFFERENTIAL
ADJUSTING SCREW
“D” MOVABLE INDICATOR
(CUT-OUT POINT)
“A” ADJUSTING
SLOT
“B” FIXED
INDICATOR
“A” ADJUSTING
SLOT