1
4-12 in. FrostSafe™ Two-Way Damper
OPERATION, MAINTENANCE AND INSTALLATION
INTRODUCTION
This manual will provide you with the information to
properly install, maintain and ensure a long service
life for the FrostSafe™. The FrostSafe
™
is installed
in vent pipes used to vent vaults, reservoirs and air
valves to help protect vault components and air
valves from freezing due to convection by minimizing
the flow of cold air into the vault while allowing air
flow in both directions when necessary. The
FrostSafe™ is designed with three flexible
membranes that fully open when venting and snap
closed when finished to prevent cold air from
entering.
RECEIVING AND STORAGE
Inspect the FrostSafe™ upon receipt for damage in
shipment. Unload all devices carefully to the ground
without dropping.
The devices should remain boxed, clean and dry
until installed to prevent weather related damage.
For long-term storage greater than six months, the
rubber membrane should be coated with a thin film
of FDA approved grease such as Lubriko #CW-606.
Do not expose rubber membrane to sunlight or
ozone for any extended period.
DESCRIPTION OF OPERATION
The FrostSafe™ is a wafer-style hingeless 2-way
damper that prevents cold air from entering the
vault, reservoir or air valve while still allowing the
vent to perform its function of admitting and
expelling air under normal operating conditions.
INSTALLATION
The installation of the FrostSafe™ is important for its
proper operation. The FrostSafe
™
can be installed
in the vertical or horizontal position between typical
ANSI Class 125 flanges using standard connection
practices. The FrostSafe
™
Device can be located in
the vault or above ground as shown in Figure 2.
The device can also be placed in series at both
locations for added protection. Since the
FrostSafe
™
is a two-way flow device, it has no
designated flow direction.
Flanged connections should only be mated with flat-
faced pipe flanges. The bolts should be tightened in
gradual steps using the crossover method.
Recommended torque values are given in Table 1.
The FrostSafe
™
can be used with rubber or
compressed fiber ring-type gaskets.
TABLE 1. FLANGE BOLT TORQUES
Figure 1. FrostSafe™ Two-Way Damper
Mounting Flange Bolts
Device
Size
Bolt
Size
Recommended
Torque (ft-lbs)
Maximum
Torque (ft-lbs)
4 5/8”
20
30
8 3/4”
30
40
12 7/8"
60
70
CAUTION:
The use of excessive bolt torque
may damage the device.
