Refrigerating Specialties Division
4
Disassembly and Assembly
(continued)
Modudapter
(See Figs. 1, 2 and 3)
The Modudapter 28 will accommodate the Modular Pilot Solenoid and
Moduplate. When assembling make sure the Modudapter gauge port is
directly lined up with the inlet of the regulator. Passage N must communicate
upstream pressure through the hole in the Adapter Gasket 29 as well as into
Modudapter 28 and thence to the pilot modules. It is imperative that proper
alignment of these items be made to assure regulator function.
Before disassembly, make sure all refrigerant has been removed from the
regulator and strainer, if used.
Protect the surfaces of Pads 1 and 2 of the Modudapter at all times since
these surfaces determine the sealing tightness of the “O” Rings.
S6A Modular Solenoid Pilot
(Fig. 4)
This solenoid pilot is mounted on Pad 1. Before working on any solenoid pilot,
make sure the coil is de-energized and will remain so during the servicing
period. Refer to page 10 for Repair Parts Kit details of S6A Solenoid Pilot.
Disassembly (Fig. 4)
- Remove Coil Housing Screw 55 and pull entire Coil and
Housing Assembly, 56 through 60, upward and off of Bonnet Tube Assembly
61. Carefully remove Bonnet-Tube Assembly. Lift out Plunger-Needle
Assembly 63, avoid damaging the needle. Remove Seat Assembly 64 by
using a 7/16” (11 mm) socket wrench. Inspect all parts, clean or replace
as needed.
Assembly (Fig. 4)
- Reinstall the Seat Assembly and tighten (no gasket
needed). Carefully insert the Plunger Needle Assembly. Replace the Gasket
62 and re-install Bonnet-Tube Assembly. Replace entire Coil and Housing
Assembly and tighten Coil Housing Screw.
Make sure the solenoid coil is of the proper voltage and frequency.
When mounting the solenoid pilot, place the “O” Rings 50 into the proper
grooves and tighten the Cap Screws 66, evenly. The ideal tightening torque
is 1.1 kg-m (8 ft. lbs.).
Moduplate
(Fig. 2)
The Moduplate Item #52 is used to stop the flow through the flow path of
the Modudapter. Protect the “O” Ring surfaces at all times. When mounting
the Moduplate, place “O” Rings 50 into the 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:
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.
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.
S6A Modular Solenoid Pilot
(For A4AOS/A4AOSE)
Fig 4
