Installation of Building Pressure Control (optional)
1. Mount Pressure Tap
Using the factory provided bracket, mount the pressure tap to the
outside of the unit. Choose a location out of the prevailing winds and away from supply or exhaust fans to assure accurate readings.
2. Run Pressure Tap Lines
Run a pressure tap line from the pressure tap on the outside of the unit to the low pressure tap on the back of the photohelic gauge. Run a second pressure tap line from the high pressure tap on the back of the photohelic gauge to the space. Fifty feet of tubing is supplied with the unit.
Factory |
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| High Pressure |
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| Tap | |
Wiring |
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| to Space |
Low Pressure
Tap
to Outside
Connections for Photohelic Gauge
3. Set the Building Pressure
The pressure gauge is used to set the desired building pressure. The pressure is set by adjusting the knobs for the upper and lower pressure limits. Typical settings are 0.0 inch wc for the lower and 0.10 inch wc for the upper pressure setting.
Pressure Indicating | Pressure Setting |
Needle | Needles |
Pressure Setting Knobs
Typical Photohelic Gauge Settings
® | Model MSX | 15 |
