Install Instructions

STATIC PRESSURE CONTROL (SPC)
69-1526 2
Fig. 3. Installing threaded barb fitting into lower
pressure port.
WIRING
Wire the SPC to the damper and a 24 Vac, 40 VA
transformer (not supplied) as shown in Fig. 4 and 5.
Fig. 4. Wiring SPC to control ML6161 Actuator in a
bypass application.
Fig. 5. Wiring SPC to control CDO-51 or MARD
damper in bypass application.
SETTINGS
The SPC is adjustable from 0.1 in.wc to 4.0 in. wc with a
10-15 percent null range. The factory setting is 0.1 in. wc.
To adjust this setting, remove the hexagonal screw cap at
the top of the indicator and turn the adjusting screw with
a screwdriver. The top of the adjusting screw is the
indicator as shown in Fig. 6.
To increase the pressure setting, turn the screw down
(clockwise). To decrease the pressure setting, turn the
screw up (counter-clockwise).
Fig. 6. Static pressure range settings.
CHECKOUT
Make all zones call and verify that the bypass damper is
fully closed. Then make the smallest zone the only one
calling and verify that the bypass damper is open.
PRESSURE
CONNECTION
TO BOTTOM
CHAMBER
VENT
(LEAVE OPEN)
M19020
SPC
COM
CCW (CLOSE)
CW (OPEN)
ML6161
LINE VOLTAGE
MODEL PMT-40
24 VAC TRANSFORMER
M19021
C NC NO
SPC
COM / M1
CL / M6
OP / M4
MARD OR CDO-51
LINE VOLTAGE
MODEL PMT-40
24 VAC TRANSFORMER
M19022
C NC NO
25
50
75
102
MM
W.C.
IN
W.C.
13
3
1
2
3
4
.5
.1
M19023
GREY SPRING
REMOVEABLE
SCREW CAP
TOP OF SCREW
IS INDICATOR
ADJUSTING
SCREW