H.C Duke & Son Freedom 360 Degrees Series Operator’s Manual With Illustrated Parts List page 149

INSTALLATION AND SERVICE MANUAL 917N-CMT, 927CMT, 957CMT
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11.5.2 Installing New Cylinder Pressure Switch – continued
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Figure 11-3
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46
5. Apply a thin film of grey RTV silastic
sealant around O-ring on switch and
a 1/8 in. bead around the head of
pressure switch. (See figure 11-3.)
6. Install the switch into the cylinder
hole, taking care not to smear the
bead of RTV. Align the horizontal
line into position noted in the trial
installation. Place the holding tool in
cylinder straight over the switch to
hold the switch in place.
7. With the O-ring in the spacer, apply
a thin film of gray RTV sealant on
the o-ring, slide it over the switch
body and thread it on the nut. Align
the locating lines and tighten the nut
finger-tight. Tighten 3 set screws
uniformly to finger-tight. (2 in-lb
torque)
8. Remove the holding tool from the
cylinder.
9. Wipe off excess RTV inside the
cylinder with a tissue or a soft paper
towel. Allow RTV sealant to cure for
30 minutes.
10. Reconnect switch leads to wires and
secure in place with tie-wraps.
Important
Excessive pressure on nut or set
screws will change pressure
setting and may damage pressure
switch.
11. While waiting, seal the wires where
they exit the switch. Squeeze out a
liberal amount of the clear silicone
sealant and allow it to flow over the
rear of the switch (See Fig 11-3.)
The sealant should cover the entire
black cap, 3/4 in. of the exposed
wires and 1/4 in of the metal hous-
ing. Place a paper towel under the
switch to catch the excess sealer
which runs off. After a skin forms on
the sealant—about 15 minutes—
apply a full second coat.
12. The installation can be checked for
leaks using water. Also check the
cut-out and cut-in pressure setting
of the switch. (Use part number
116312 pressure gauge assembly.)
NOTE: Cut out pressure must not
exceed 26 psig and the cut in pressure
should be within 2-5 psi of the cutout
pressure.
NOTE: Minimum cut out PSIG is 19
PSIG.
Important
Pressures over 26 psig will cause
the hose to stretch which will
shorten the life of the hose.
13. Once the 2nd coat of clear sealant is
dry, repack permagum insulation
around pressure switch. Then the
freezer can be cleaned, assembled,
sanitized and placed in service.
184617-02