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50
A2D2, A2D MODULAR
PRESSURE PILOT
A2D2 Port Sizes 20-50mm (3/4" - 2")
A2D Port Sizes 65-100mm (2½" - 4")
Moduplate (Figs. 6 and 12)
These Moduplates 52 are used to direct the flow or stop the flow
through the flow paths of the Modudapter. Protect the "O" Ring surfaces
at all times. When mounting the Moduplate, place "O" Rings 50 (or "O"
Ring 54) into the proper grooves (lubricate with silicone grease) and
tighten the Cap Screws 53 evenly to avoid distortion and assure proper
sealing. The ideal tightening torque is 1.1 Kg-m (8 ft. lbs.).
Maintenance and Service General Procedure:
Before disassembly of regulator, make certain that all refrigerant has
been removed (pumped out) from the regulator and its companion
strainer where one is used. Read Safety Bulletin RSB.
Dirt In the system Is the greatest single cause of regulator malfunction.
All screens or filters must be cleaned or replaced when they become
dirty. At start up it is especially important that these Items are cleaned
or changed frequently. When the RSF close-coupled companion
strainers are used, maintain according to instructions in Bulletin 00-10.
Moisture in halocarbon systems in particular can cause corrosion or
form ice, causing the piston to freeze in position. Filter-driers should
be used and maintained for halocarbon systems.
Before deciding to disassemble a regulator for servicing, the following
investigations should be made:
Refrigerating Specialties Division
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Check the manual opening stem; it should be turned in for automatic
operation.
Check the regulator setting to make sure it is properly adjusted. Turn
adjusting screw slowly to see if regulator responds. Check regulator
pressure range; if wrong, range spring must be replaced.
Check other system components for proper operation. Make sure that
the regulator receives the proper electrical signal where modular pilot
solenoids are used. Make sure they are same as the power supply.
Check hand valves in the system to make sure they are open or closed
as required and the system is receiving liquid or gas as the case may
be.
MODULAR PRESSURE PILOT
MODULAR SOLENOID PILOT
Solenoid Coils and Coil Housing
The solenoid coils and coil housing, identified and described on page
8 for the Type S6A Solenoid Pilot, are an improved design which
provide a higher MOPD and a cooler coil resulting in longer life. The
new coil and its heavily plated, rust resisting housing are
interchangeable with the obsolete coil and cast iron housing as follows:
The new coil, which has its Part Number stamped on the side, can be
used in both the old and new coil housing; the old coil which has its
30-0030-XX Series Part Number stamped on one end, can be used in
the old, cast iron housing only. There is no bottom marking on the new
coil; either end may be positioned up. The color coding of lead wires
for various voltage and frequencies has not been changed. The fuses
used with the old coils are suitable for the new coils; the new coil
power consumption is 33 Watts instead of 37.
The S6A pilot solenoid valve is also available with a coil using a quick
electrical connector or plug, permitting easy wiring connection with
an exposed rubber covered cable instead of a rigid or flexible conduit
and enclosed wiring. This type of coil cannot be used with the old,
cast Iron housing.
The new coils and new housing described above for the S6A valve
are also used with Solenoid Valve Types S4, S5, S6N, S7, S8 and S9.
7
A2D
MODUPLATE
S6A
Fig. 12
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