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INSTRUCTIONS R429d
Dec 2003
ELECTRICAL
When the electric shut-off, wide-opening, or dual feature
is supplied, a Hansen low-wattage, molded electrical
coil is included. Standard coil voltages are 115V, 208/
230V, or 24V at 50/60Hz. Other voltages available.
The coil properly operates between 85% and 110% of
the rated voltage. Coils should only be energized while
on the pilot solenoid tube. Unless otherwise specified,
the standard coil with a ½" fitting for conduit is supplied
with valves.
A watertight solenoid coil with 18" (450 mm) long wire
pigtail leads and a steel frame housing with a ½" conduit
fitting is standard.
Optional DIN Plug Coils are for grounded cord
connections and include the necessary DIN plug socket
with gasket.
Coils with Junction Boxes are optional. Integral, steel
junction box for connection of the 18" (450 mm) long
wire pigtail leads.
Vibration-resistant, bright, long-life, neon pilot lights
are available. These pilot lights operate on primary
voltage; a special coil with secondary winding is not
necessary. Optional watertight pilot light assembly is
also available.
SERVICE AND MAINTENANCE
Failure to open:
Wrong coil or control module pilot; low line voltage;
controlling switch or thermostat not contacting; coil is
burned-out; adjacent shut-off valve closed; adapter
gasket hole not aligned with hole in body and adapter;
dirt packed under Teflon seal ring enabling excessive
blow by; large quantity of dirt particles in solenoid
module passages; dirt blocking internal pilot passages;
main valve seat is dirt jammed.
Failure to close:
Controlling switch or thermostat not opening contacts;
manual-opening stem is turned in; valve installed in
wrong direction; damage or dirt at main valve seat or
pilot seat; piston bleed hole plugged. Under extreme
conditions of liquid or oil “slugging” or pressure drops
exceeding 45 psi (3.1 bar), special construction may
be required. Contact the factory.
Before opening the regulator or disassembling the pilot
for service, be sure it is isolated from the system and
all refrigerant is removed (pumped out to zero pressure).
Follow usual refrigeration system safe servicing
procedures. Read the CAUTION section of this bulletin
on page 20.
To check solenoid pilot section of valve, disconnect
the electrical coil. Unscrew the coil nut and remove
washer. Lift coil housing away from valve. Remove the
four solenoid tube screws and remove solenoid tube
from valve. Inspect for dirt and damage to Teflon seat
and stainless steel pilot orifice. Clean, polish or replace
parts as necessary, then reassemble.
¾" THROUGH 1¼" (20 MM THROUGH 32 MM)
Use a
3
/8" male hexagon wrench to loosen the four
adapter bolts, proceeding slowly to avoid refrigerant
which may still remain in the valve. If piston parts are
stuck, remove the 2" hex bottom cap in order to separate
the valve V-port/seat from the disc piston. Inspect disc
and piston bore for burrs, nicks, and other damage.
Remove burrs and nicks, clean or replace disc piston
and Teflon seal ring as necessary. Long-life seal on
disc piston need only be replaced when damaged or
severely worn. If replacing the disc piston seal, make
sure the seal is properly installed, with the edge up,
and does not “twist” during installation. Inspect V-port/
seat and main valve seat for nicks, marks, etc. The
main valve seat may be lapped by hand or power drill
to remove marks. Clean, polish or replace parts as
necessary. If necessary, the V-port tapered seat may
be reconditioned by removing up to 0.04" (1 mm) of
Teflon from it on a lathe. Lightly lubricate all parts and
gaskets with soft rag containing refrigerant oil. Align
hole in valve body, adapter gasket, and adapter to
assure proper operation. Reassemble valve. Carefully
check valve for leaks before returning it to service.
1½" THROUGH 6" (40 MM THROUGH 150 MM)
Loosen adapter bolts using a 12" adjustable wrench
(15" wrench for 5" and 6" valves), being careful to
avoid any refrigerant which may still remain in the
valve. If disc piston is difficult to remove, insert a ¼"-20
threaded screw (
3
/8"-16 for 5"& 6" valves) into center of
piston and lift straight-up. Inspect piston and piston
bore for burrs, nicks and other damage. Remove burrs
and nicks, clean or replace piston as necessary. Long-life
seal on disc piston need only be replaced when damaged
or severely worn. If replacing the disc piston seal,
make sure the seal is properly installed, with the edge
up, and does not “twist” during installation. These valves
also have a removable stainless steel main valve seat.
To remove seat ring for inspection, first remove small
hex head seat screw. Turn the seat ring counterclockwise
by turning it out with a wrench and a steel bar tool
positioned horizontally or by carefully tapping the seat
ring notch with a punch and a hammer. Inspect the V-
port/seat and main valve seat for nicks, marks, and
divots. The main valve seat may be lapped by hand or
power drill to remove marks. Grease and replace the
seat sealO-ring. Clean and polish, or replace the parts
as necessary. If necessary, the V-port tapered seat
may be reconditioned by removing up to 0.04" (1 mm)
of Teflon from it on a lathe. Lightly lubricate all parts
and gaskets with a soft rag containing refrigerant oil.
Align the hole in the valve body, adapter gasket, and
adapter to assure proper operation. Reassemble the
valve. Carefully check the entire valve for leaks before
restoring it to service
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