Honeywell MP-953D Installation And Maintenance Manual page 7

MP-953F PNEUMATIC.OPERATORS USED ON ARMSTRONG HUMIDIFIERS
VIII.OPERATING RANGE AND START POINT - MP-953B (See Figure 3)
Using a wrench (Honeywell Part No. 301572A supplied
with gradutrol), loosen the cover locking screw.
Unscrew the start point adjustment knob and make
2.
adjustments according to the directions printed inside
the knob as follows:
Range adjustment -
a)
b)
c)
Start point adjustment -
IX. OPERATING
1. Set
desired.
the start point l/4 psi.
NOTE:
POINT IS ADJUSTABLE.
ADJUSTABLE.
THE FEEDBACK SPRING.
Honeywell MP-953F operators (with positioners) come
standard with an 8 - 13 psi (black) main spring. This
maybe changed in order to
operator.
(See Chart 4)
full open point willbethe startpointplus the spring
range.
3 lb. range,
screws backed
to friction stop.
5 lb. range, plated
(outer) s c r e w s
tightened.
(inner) s c r e w s
b a c k e d - o f f
friction stop.
10 lb. range, all
screws tightened.
Tighten cover until
it bottoms.
Back off (one turn
max.) until desired
start point
correct range scale
lines up
indicator near 1 1 B"
marking.
Tighten the cover locking screw until it engages
the relay housing.
RANGE AND START POINT - MP-953F PILOT POSITIONER
the start point on the positioner to the value
Each click of the start point knob adjusts
ON THE MP-953F PILOT POSITIONER, ONLY THE START
THE RANGE CAN ONLY BE CHANGED BY REPLACING
It is available in 3
Since the start point is adjustable,
all
off
S
TART POINT
Black
t o
of
with
Fig. 3 - Adjustment Points of
Do not overtighten.
THE SPRING RANGE IS NOT
vary
the
6
RANGE ADJUSTMENT
COVER
LOCKING
/ S
C R E W
Gradutrol Relay.
spring range of the
SCREWS
RANGE ADJUSTMENT
SCREWS
START