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Wiper on the controller potentiometer moves in response to  
pressure changes.  
Honeywell  
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D has 2 potentiometers for unison control of 2 motors.  
has a fixed resistor and a manually-adjusted trim  
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PROPORTI ONI NG  
potentiometer in series with the controller potentiometer; for  
special applications in electronic bridge circuits.  
PRESSURETROLCONTROLLERS  
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and F models have an adjustable proportioning  
throttling) range to allow selection of desired pressure control  
range.  
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PROPORTIONING PRESSURETROL CONTROLLERS ARE  
SERIES 90 MODULATING PRESSURE CONTROLLERS THAT  
PROVIDE DIRECT CONTROL OF MODULATING MOTORS OR  
VALVES USED ON AUTOMATIC BURNERS OR STEAM HEAT-  
ING SYSTEMS.  
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Adjustments are made by screws on top of case.  
Large, easily-read scaleplates are marked in both customary  
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(or/in.*, psi, or in. Hg) and metric  
or mm Hg) units.  
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Steel case has clear plastic cover so that pressure settings  
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Models available for pressure systems up to 300 psi  
and potentiometer action can be observed.  
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Fitting with  
NPT threads provides rapid installation.  
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These controllers may be used with steam, air, noncombust-  
ible gases, or other fluids noncorrosive to the brass or  
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Controller can also be surface mounted by screws through  
bronze (300 psi models) bellows.  
holes (knockouts) in back of case.  
SPECIFICATIONS  
1
TABLE I-MODELS AVAILABLE  
0
.03 to 1.03  
0.09 to 0.36  
0.21 to 0.76  
10 to 63  
to 300  
to 15 psi  
to 150 psi  
0.07 to 2.07  
0 to 103  
23176CF  
9
Yes  
Yes  
Yes  
30 to 110 psi  
1.5 to 12 psi  
13 to 52 psi  
2413  
172  
0
25  
5
0.03 to 1.03  
0.09 to 0.36  
225  
1551  
are marked in both customary  
psi, or in. Hg) and Metric  
or mm Hg) units.  
available with or without steam trap (siphon loop).  
‘Includes steam trap (siphon loop).  
available with  
in. BSP-TR internal threads (British Standard Pipe Threads) for mounting.  
resistor and one manually-adjustable trim potentiometer in series with thecontroller potentiometer. Varidus combinations of resistance  
models have  
values and locations of the fixed resistor and trim potentiometer are available. See Table II.  
of active winding is in. mm] for Part No. and in. mm] for Part No. 23176CF.  
Table II for potentiometer part number.  
D.A.  
Form Number 65-0059  
@Honeywell Inc. 1966  
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FINISH: Gray.  
MAIN SCALEPLATE: Marked in both customary  
psi, or in.  
Hg) and Metric  
or mm Hg) units.  
PROPORTIONING RANGE  
and F only):  
ADJUSTING SCREW  
CONTROLLER  
POTENTIOMETER(S)  
graduated from A to F with a MIN (minimum) value below A. (See  
Table Ill for the value of each division.)  
SCALE  
ADJUSTING  
MOUNTING MEANS: Fitting on bellows has NPT threads  
(external on 0 to 16 0 to 4 psi, and 0 to 15 psi models;  
internal on all other models) for mounting on a pipe or steam trap  
siphon loop).  
POTENTIOMETER  
SCREW  
(
POTENTIOMETER  
NOTE: Some models are available with  
threads: see Table  
BSP-TR internal  
WIPER ARM(S)  
Also can be surface mounted by screws through 2 holes  
knockouts) in back of case.  
PROPORTIONING  
(
SCALEPLATE  
ONLY)  
PROPORTIONING  
INDICATOR  
TABLE  
F RESISTANCE VALUES AVAILABLE  
(
L91B.D.F ONLY)  
-
B E L L O W S H O U S I N G  
I n Bl e ga  
11. 2 23367F  
17. 6 233676  
4 .  
8
4 7 0 518  
8 7 0  
R- B  
I
n
B
4. 8  
l
n
w
l e g b  
3 8 0 . 0  
6 .  
4
2 0 8 0 2515  
MAIN SCALE  
SETTING  
I N D I C A T O R  
f or Ot o 15 psi [O t  
1
o
03  
model s onl y.  
a nd 5t o 150 ps i  
1
KNURLED ADJUSTMENT KNOB ON  
TO 2.07 MODELS.  
TO  
PSI  
E l 2 7 5  
f or Ot o 15 ps i I Ot o 103  
t o 1. 03  
mode l s .  
Nomi na l  
'
r e s i s t a nc e va l ue s .  
adjustable trim potentiometer is  
ohms (nominal) in all  
models. With zero pressure on the bellows, adjust the trim potentiometer to  
obtain the resistance values listed between terminals and or between  
terminals and W, as indicated.  
FIG.  
SETTING AN  
CONTROLLER.  
PROPORTIONING  
TABLE III-APPROXIMATE VALUE OF EACH DIVISION  
MODELS:  
(A TO  
B TO C. etc.) ON PROPORTIONING (Throttling)  
RANGE SCALEPLATE  
only)  
potentiometer; nonadjustable proportioning  
range.  
OPERATING  
RANGE  
VALUE OF EACH  
DIVISION  
B-single potentiometer; adjustable proportioning range.  
potentiometers allow unison control of 2 motors;  
adjustable proportioning range.  
F-single potentiometer; adjustable proportioning range;  
fixed resistor and manually-adjustable trim potentiometer in  
series with controller potentiometer.  
ELECTRICAL RATING: 24  
POTENTIOMETER ACTION: Wiper moves toward  
on pressure  
rise; toward  
replaceable.  
on pressure fall. Potentiometer is field  
2 to 50 psi  
14 to 345  
to 1.03  
4.7 psi  
7.8 psi  
32.4  
5
to  
psi  
0 . 0 5 4  
POTENTIOMETER RESISTANCE: 140 ohms (nominal) for  
and D models; see Table II for F models.  
PRESSURE SENSING ELEMENT: Phos-bronze bellows.  
5
t o  
1. 03  
6. 7 ps i  
0 . 0 4 6  
MAXIMUM AMBIENT TEMPERATURE: 150 F  
C].  
MINIMUM AMBIENT TEMPERATURE: 32 F [0 C].  
ADJUSTMENT MEANS: Screws on top of controller case; knurled  
10 to 300 psi  
with  
0.07 to 2.07  
16.4 psi  
0.113  
in.  
knob for main scale setting on 10 to 300 psi  
to 2.07  
models.  
1
0 to 300 psi  
with  
in. pot.)  
0.07 to 2.07  
13.8 psi  
0.095  
SET POINT: At low pressure end of proportioning  
throttling) range.  
WEIGHT: 116.15 oz.  
(
kg].  
PRINTED IN U.S.A.