Refrigerating Specialties Division
3
For line equalization:
Keep solenoid coil #2 energized while de-energizing
solenoid coil #1. This will allow the valve to open the
equivalent of a 1” valve.
Full open:
De-energize both solenoid coils.
A wiring diagram for the R/S Defrost Controller is
provided at the back of the bulletin.
Electrical
The Refrigerating Specialties Division molded water
resistant solenoid coil is designed for long life and pow-
erful opening force. The standard coil housing meets
NEMA 3R and 4 requirements. This sealed construc-
tion can with stand direct contact with moisture and
ice. The coil housing far exceeds the requirements of
NEMA standard ICS, 1-110.57 salt spray test for rust
resistance.
By definition, Class “F” coil construction will permit
coil temperatures, as measured by resistance method,
as high as 130° C (226° F). Final coil temperatures are
a function of both fluid and ambient temperatures.
The higher fluid temperatures require lower ambient
temperatures so the maximum coil temperature is not
exceeded. Conversely, low fluid temperatures permit
higher ambient temperatures.
The molded Class “F” coil is available from stock with
most standard voltages. However, coils are available
for other voltages and frequencies, as well as for direct
current. Coils are also available as transformer type
with a 6 volt secondary winding for use with the Refrig-
erating Specialties Division Pilot Light Assembly (see
current copy of Bulletin 60-10, “Pilot Light Assembly
and Solenoid Transformer Coil”).
The solenoid coil must be connected to electrical lines
with volts and Hertz same as stamped on coil. The
supply circuits must be properly sized to give adequate
voltage at the coil leads even when other electrical
equipment is operating. The coil is designed to oper-
ate with line voltage from 85% to 110% of rated coil
voltage. Operating with a line voltage above or below
these limits may result in coil burnout. Also, operating
with line voltage below the limit will definitely result
in lowering the valve opening pressure differential.
Power consumption during normal operation will be
33 watts or less.
Service Pointers
1. Failure to close: (a) One, or both pilot solenoids are not
operating due to low voltage or solenoid coil burnout.
(b) Dirt lodged between one of the valve pistons and
the cylinder wall (disassemble and remove all dirt
and burrs). (c) Manual lift stem is turned in, thereby
mechanically holding the pistons in the open posi-
tion. (d) Strainer/Disc in the Pilot line Flanges may
be plugged (Remove and clean). (e) Pilot pressure
source is not high enough; must be at least .35 bar (5
psi) above the main valve downstream pressure. (f)
Solenoid coils are not being energized in the proper
sequence.
2. Failure to open: (a) Dirt lodged between the valve
pistons and the cylinder walls (Disassemble and
remove dirt and burrs). (b) Main valve spring may
be broken (replace spring). (c) Pressures between
remote pressure source and main valve downstream
pressures are not equalizing. Check for leakage
through the pilot solenoids. Check for backward
installation of the CK-6D preventing the equaliza-
tion with downstream pressure. (d) Viscous oil can
prevent the valve from opening.
3. Leakage through valve when closed: (a) There are dirt
or chips under the main valve piston. Disassemble
valve and clean thoroughly. Replace entire main valve
piston and lap grind piston face into valve and seat
bead if necessary.