Frymaster H50 Series Service And Parts Manual page 32

For a short time, one-piece, welded oil return manifolds were used. The one-piece manifolds have
been replaced with Dormont stainless steel flexlines and nipples and are no longer available.
PRE-AUGUST 1997 VS CURRENT DESIGN FP-III FILTRATION SYSTEM
Original System
Return lines and manifolds wrapped with silicone
strip heaters and aluminum tape.
Filter base assembly connected to unit with a
black, heated return hose beneath the filter.
Filter base assembly equipped with swivel cast-
ers.
Operator-removable filter base assembly. (Filter
base assembly stoplocks in cabinet can be ro-
tated to remove tray.)
Oil remains in return lines when filter system is
turned off.
Power Shower Sub-System
A solenoid vent valve is mounted on the left end of the front oil return assembly. It prevents
vacuum-lock of the system as oil drains back to the filter pan when the unit is turned off. The
solenoid valve is connected to the square drain sub-system by a clear ⅜" O.D. Teflon tube and
threaded fittings. Stainless steel Dormont flexlines connect the manifolds to the valves. Standard
½" X ½" X 90º black metal street elbows are used to make the connections.
A 22-inch Dormont stainless steel flexline, running above the filter assembly, connects the front oil
return assembly to the rear manifold.
Filter Base Assembly and Pump Sub-System
Casters have not been used on filter base assemblies built since August 1997. When the casters were
eliminated from the filter base assembly, the assembly was redesigned to prevent it from being taken
out of the cabinet without removing a set of machine screws and nuts.
A new Teflon hose with a braided stainless steel covering connects the pump to the rear manifold
and replaces the heated hose running from the pump discharge under the unit to the Power Shower
plumbing. The new hose is fitted with a 90º swivel at the manifold end and a straight swivel at the
pump end to prevent kinking.
The pump plumbing features a solenoid valve at the pump discharge, a ¼" I.D. Dormont stainless
steel flexline that connects the solenoid valve to the pump inlet fittings, and miscellaneous standard
black metal fittings for connections. This design allows oil to bypass the pump as it drains from the
oil return lines back into the filter pan when the system is turned off. Bypassing the pump expedites
draining of the lines. The pump solenoid leads are connected to Pins 7 and 9 of the upper 9-pin plug
assembly of the filter box.
Filter Wiring Box
The original-design 5-lead cable connecting the filter assembly to the filter wiring box has been
replaced with a new, universal 7-lead cable to accommodate the solenoid mounted on the front
Redesigned System
No heater strips or aluminum tape on return
lines.
Non-heated Teflon hose with a swivel joint con-
nects the filter base assembly to the unit above
the filter.
Filter base assembly has no casters.
Filter base assembly is not removable except by
a qualified service technician. (Filter base as-
sembly stoplocks fitted with a screw and nut to
prevent filter removal.)
Oil gravity-drains back to the filter pan when filter
system is turned off, leaving no oil or shortening
in return lines.
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