Honeywell Home Static Pressure Control (SPC) Installation Guide
- June 7, 2024
- Honeywell Home
Table of Contents
Static Pressure Control (SPC)
INSTALLATION INSTRUCTIONS
APPLICATION
The Static Pressure Control (SPC) is an adjustable, single-pole double-throw differential pressure switch. It is used to control a floating-type modulating damper for bypass zone applications. Acceptable dampers are MARD or the 90-second ML6161 Actuator. The contacts are rated at 125 VA. See Fig. 1.
**INSTALLATION
**
Selecting the Mounting Location
- Locate the SPC near the supply air ductwork. Fig. 1 shows the dimensions in inches (mm).
- Orient it with the adjustment screw on the top as shown in Fig. 2.
- Use the supplied bracket and hardware.
****
Mounting the SPC
- Mount the SPC near the supply ductwork in the upright position.
- Install one threaded barb fitting into the lower pressure port as shown in Fig. 3.
- Attach the supplied tubing to the barbed fitting.
- Drill a 1/2 in. hole into the ductwork and insert the supplied surface mount duct fitting.
- Seal it with a small amount of silicone sealant and attach it to the two supplied self-tapping screws.
- Connect the opposite end of the tubing to the barbed end of the duct fitting.
STATIC PRESSURE CONTROL (SPC)
WIRING
Wire the SPC to the damper and a 24 Vac, 40 VA transformer (not supplied) as
shown in Fig. 4 and 5.
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).
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.
TROUBLESHOOTING
If the SPC does not operate as specified in the Checkout procedure, see Table
Table 1. Troubleshooting.
| Problem | Possible Trouble | Solution |
|---|---|---|
| SPC does not operate the damper. | Problem with the tubing. | Verify that the |
tubing is not kinked or plugged.
Wired incorrectly.| Verify the wiring.
Bypass damper closes as zones are satisfied.| Incorrectly wired damper.|
Verify that the N.C. and N.O. are correctly wired to the damper.
The damper does not open enough when the smallest damper is the only one
calling.| SPC is set too high.| Decrease the pressure setting by turning the
adjustment screw up (counterclockwise).
The damper does not close fully when all zones are calling.| SPC set too low.|
Increase the pressure setting by turning the screw-down (clockwise).
If the SPC does not operate as specified in the Checkout procedure, see Table
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
69-1526—01 M.S. 07-21 | Printed in the United States
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The Honeywell Home trademark is used under license from Honeywell
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