13.1 Application
This switch, a SPDI type flow switch, is a kind of relay
used for inspecting and observing liquid flow. Normally, it
is applied to air flow adjustment and water supply equi-
pments and induction flow channels where there is flow
variation such as water, ethane, ethanediol and other non-
hazardous liquids. Its typical application is where linkage
or cut-out protection is needed.
13.2 Parameters
Maximum working pressure: 1.6MPA, connector size:
1”NPT, 3/4 ”NPT and 1/2 ”NPT With three-way pipe
connector.
13.3 Flow adjustment range and media temperature
range
18L/min-2000L/min (standard)
5L/min-3000L/min (non-standard)
-45℃-120℃
This switch shall not be used in pipes where freezing is
possible. The flow switch is designed to be used as a
controller. Failure of its controlling function may result in
personal injury and/or property damages. The managerial
personnel shall be responsible for installing protection
devices (safety device and restriction controller), or
adding alarm and monitor systems to guard against its
failure.
The controller shall not be used for load in excess
of the ratings as shown in the controller label.
13.4 Installation
In order to sense the flow variation, its flap shall not be in
contact with the pipe wall, neither with any throttle
devices in the pipe.
Danger of incorrect operation.
The switch has been set to the minimum flow at the plant,
which shall not be exceeded during adjustment as it may
result in the switch's failure to reset to no flow position.
The HF68 flow switch MUST be installed in a linear pipe
13 INSTALLATION INSTRUCTIONS FOR THE HF68 FLOW SWITCHES
at both sides of which there MUST be a linear length
with at least five times of the pipe diameter. When a
switch is installed, its wiring terminals must be
accessible.
The switch should be installed in a position easy for
wiring, normally within the outlet stop valve for the
convenience of maintenance.
It is suggested to install the flow switch in the following
steps:
1. Drill the water pipe with the hole size 3-4mm larger
than the outer diameter of the steel connector.
2. Weld the steel connector to the hole of the water pipe.
3. Tighten the switch on the steel connector with a flat
wrench. Note: DO NOT tighten it with the switch
housing.
4. Ensure that no part is in contact with the pipe wall or
its activity is not obstructed.
5. Adjust the water flow to the minimum design flow
with an adjusting screw. The on/off action and the arrow
on the housing MUST point at the flow direction.
The steel connector MUST be welded directly on
the water pipe. The steel pipe shall not be welded
to the water pipe to connect the steel connector.
The steel connector MUST be the one provided
by YORK which is included in the water flow
switch packaging box. No use of this connector
may result in flow switch explosion.
The flow switch shall not be subject to water hammer. If
a snap cut-off valve is installed on the downstream of the
flow switch, appropriate water hammer proofing devices
MUST be used.
13.5 Wiring
All wiring can adopt only copper conductors and NEC or
local regulations MUST be observed. HF68 has color
WARNING
CAUTION
CAUTION
YEWS-E Water Cooling Screw Chiller/Heat Pump
72
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