Asco 8220 Series Installation & Maintenance Instructions

Installation & Maintenance Instructions
2-- WAY INTERNAL PILOT-- OPERATED SOLENOID VALVES
NORMALLY CLOSED OPERATION — STEAM OR HOT WATER SERVICE
NOTICE: See separate solenoid installation and
maintenance instructions for information on: Wiring,
Solenoid Temperature, Cause of Improper Operation, Coil
or Solenoid Replacement.

DESCRIPTION

Series 8220 valves are 2---way normally closed, internal pilot
operated solenoid valves designed for steam or hot water
service. These valves are made of forged brass with stainless
steel internal parts and ethylene propylene, and/or
TEFLON* elastomers, depending upon construction.
Series 8220 valves may be provided with a general purpose
or explosionproof solenoid enclosure.

OPERATION

Normally Closed: Valve is closed when solenoid is
de---energized; open when energized.
IMPORTANT: Minimum operating pressure differential
required is 5 psi.

INSTALLATION

Check nameplate for correct catalog number, pressure,
voltage, frequency, and service. Never apply incompatible
fluids or exceed pressure rating of the valve. Installation and
valve maintenance to be performed by qualified personnel.
CAUTION: Maximum
differentials are based on temperature-- related
material limitations. Therefore, do not use valves with
a steam source of higher pressure than the nameplate
maximum operating pressure differential. Also do not
use a pressure reducing valve to reduce steam source
to rated pressure because this would result in
superheated steam of excessive temperature entering
the valve.

Temperature Limitations And Pressure Ratings

For maximum valve ambient and fluid temperatures, refer
to chart below. Check nameplate for maximum pressure
rating.
Maximum Pressure
Watt
Rating psi & Service
Rating
(Maximum Operating
AC
Pressure Differential)
150 Hot Water 6.1
6.1
50 Steam
150 Hot Water
10.1
10.1
125 Steam
{ Note: Maximum ambient temperature for valves supplied
with Class H, AC coil (Prefix HT) is 140_.
ASCO Valves
R
ASCO Valve, Inc. 50 Hanover Road, Florham Park, New Jersey 07932
E R
3/8I 1/2I 3/4I NPT
operating pressure
Coil Max.Amb. Max.Fluid
Class Temp. _F Temp. _F
32 ---125_F
32 ---210_F
F
(0 ---99_C)
(0 ---52_C)
{
32 ---125_F 300_F
F
(149_C)
(0 ---52_C)
{
32 ---140_F
32 ---210_F
H
(0 ---60_C)
(0 ---99_C)
32 ---140_F 353_F
H
(0 ---60_C) (178_C)

Future Service Considerations

Provision should be made for performing seat leakage,
external leakage, and operational tests on the valve with a
nonhazardous, noncombustible fluid after disassembly and
reassembly.

Positioning

This valve is designed to perform properly when mounted in
any position. However, for optimum life and performance,
the solenoid should be mounted vertically and upright to
reduce the possibility of foreign matter accumulating in the
solenoid base sub---assembly area.

Piping

Connect piping or tubing to valve according to markings on
valve body.
CAUTION: This valve is equipped with ethylene pro-
pylene elastomers which can be attacked by oils and
greases. Wipe the pipe threads clean of cutting oils.
Apply pipe compound sparingly to male pipe threads only.
If applied to valve threads, the compound may enter the
valve and cause operational difficulty. Avoid pipe strain by
properly supporting and aligning piping. When tightening
the pipe, do not use valve or solenoid as a lever. Locate
wrenches applied to valve body or piping as close as possible
to connection point.
CAUTION: To protect the solenoid valve, install a
strainer or filter, suitable for the service involved, in the
inlet side as close to the valve as possible. Clean
periodically depending on service conditions. See
ASCO Series 8600, 8601 and 8602 for strainers.

MAINTENANCE

WARNING: To prevent the possibility of
death, serious injury or property damage,
turn off electrical power, depressurize valve,
and vent fluid to a safe area before servicing
the valve.
Note: It is not necessary to remove the valve from the
pipeline for repairs.

Cleaning

All solenoid valves should be cleaned periodically. The time
between cleanings will vary depending on the medium and
service conditions. In general, if the voltage to the coil is
correct, sluggish valve operation, excessive noise or leakage
will indicate that cleaning is required. In the extreme case,
faulty valve operation will occur and the valve may fail to
open or close. Clean strainer or filter when cleaning the
valve.
*DuPont Co. Registered Trademark
www.ascovalve.com
SERIES
8220
I&M No.V9571R3
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E208523--- 04/10