MUC IOM
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GFS Differential Air Pressure Switch Installation
Systems with a gas heating appliance or gas log set require a GFS differential air
pressure switch to prove fan function and available draft in the venting system.
Mounting
Check the pressure switch for damages. Do not use if damaged! Do not mount the
pressure switch on uneven, hot, or vibrating surfaces! Do not tighten the screws too
much, in order to avoid deforming of the device’s base. Mount the pressure switch with
the pressure connections pointing downwards, to drain condensation moisture which
might occur. In general, the mounting with two screws next to each other is sufficient.
The maximum diameter of the screws must not be bigger than 0.315" (8 mm).
Pneumatic Connections
The two pressure ports on the end of the enclosure are labeled P1(+) and P2(-). Ensure
these ports are connected correctly and that the shipping cap is removed from port(s).
Install the vent probe as close to the fan as possible on a fireplace system, figure 5. On
a gas heating appliance vent system install the vent probe in the common, figure 6.
Then connect the pressure tubing between the vent probe and the P2(-) port on the
GFS pressure switch
.
Use the supplied high temperature 0.170” I.D. flexible tubing for
the pressure connections.
If mounting location is farther than 10ft use 0.25" I.D. rigid tubing.
Cut 2 short pieces of
the supplied tubing and use as couplings
for proper sealing, heat isolation and ease
of installation. Arrange the tubing to minimize stress on the connections and ensure
there are no kinks in the tubing. In vent systems it is recommended that the tubing slope
back to the vent for draining to prevent condensate from collecting in the sensing line.
Ensure the tubing is clean and do not allow material to fall into the pressure ports as
contamination could damage the switching mechanism. When removing tubing use care
to avoid breaking the ports.
Figure 4
