b&REPAIR
AND ADJUSTMENT PROCEDURES FOR HONEYWELL
MP-953B,
MP-953D,
1)
MP-953F PNEUMATIC.OPERATORS USED ON ARMSTRONG HUMIDIFIERS
VIII.OPERATING RANGE AND START POINT
-
MP-953B (See Figure 3)
1.
Using a wrench (Honeywell Part No.
301572A
supplied
with gradutrol), loosen the cover locking screw.
2.
Unscrew the start point adjustment knob and make
adjustments according to the directions printed inside
IX.
the knob as follows:
Range adjustment
-
a)
3 lb. range, all
screws backed
off
to friction stop.
b)
5 lb. range, plated
(outer) screws
tightened.
Black
(inner)
screws
backed-off to
friction stop.
c)
10 lb.
range, all
screws tightened.
Start point adjustment
-
a)
b)
cl
Tighten cover until
it bottoms.
Back off (one turn
max.) until desired
start point of
correct range scale
lines up with
indicator near
11
B"
marking.
Tighten the cover locking screw until it engages
the relay housing. Do not overtighten.
OPERATING
1.
Set
2.
S
c
TART POINT
iDJUSTMENT
COVER
RANGE ADJUSTMENT
,,r,nn
LOCKING
hlY”D
/SCREW
SCREWS
RANGE ADJUSTMENT
(BLANK)-
(3)
SCREWS
RELA; BODY
Fig. 3
-
Adjustment Points of
Gradutrol Relay.
START
3R
RANGE AND START POINT
-
MP-953F PILOT POSITIONER
the start point on the positioner to the value
desired.
Each click of the start point knob adjusts
the start point
l/4
psi.
NOTE:
ON THE MP-953F PILOT POSITIONER, ONLY THE START
POINT IS ADJUSTABLE.
THE SPRING RANGE IS NOT
ADJUSTABLE.
THE RANGE CAN ONLY BE CHANGED BY REPLACING
THE FEEDBACK SPRING.
Honeywell MP-953F operators (with positioners) come
standard with an 8
-
13 psi (black) main spring. This
soring
does
us&
mge.
The feedback spring, however,
maybe changed in order to
vary
the
spring range of the
operator.
It is available in 3
(See Chart 4)
,\-5,
or 10 lb. ranges.
Since the start point is adjustable,
full open point willbethe startpointplus the spring
range.
6
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