Install Instructions

FANs 121, 125
Valves, Miscellaneous Section V
Repair Parts Bulletin V46, V47
Issue Date 0196
© 1996 Johnson Controls, Inc.
1
Part No. 24-8414-12, Rev. B
Code No. LIT-121695
V46, V47, 246, and 247 Repair Parts
and Service Instructions
A
pplication Overview
The V46 pressure-actuated and V47 temperature-
actuated water-regulating valves are used for
water-cooled condensers, bypass service on
refrigeration systems, engine cooling, and various
industrial applications.
IMPORTANT: All Series V46 and V47 valves are
designed for use
only
as operating
devices. Where system closure,
improper flow, or loss of pressure due
to valve failure can result in personal
injury and/or loss of property, a
separate pressure relief or safety
shutoff valve (as applicable) must be
added by the user.
A
djustments
To raise the valve opening point on direct-acting
valves, turn the adjusting screw counterclockwise. To
lower the valve opening point, turn the range adjusting
screw clockwise. See Figure 2. The closing point of
the valve is not adjustable. Pressure-actuated valves
close approximately 3 to 7 psi (21 to 48 kPa) below the
opening point, and temperature-actuated valves close
approximately 3 to 5
°
F (1.7 to 2.8
°
C) below the
opening point.
If the compressor operates in high ambient
temperatures, head pressures may remain high
enough during off cycles to prevent the valve from
closing completely. In such instances, the opening
point of the valve should be raised just enough to
cause the valve to close during compressor standby
periods. This will also raise the throttling point.
The all-range pressure-actuated valve settings can be
adjusted for both low pressure refrigerant ranges of
R-134a and higher pressure refrigerant ranges of
R-22 (R-502).
M
anual Flushing
To clear any sediment that may accumulate, valves
may be manually flushed by inserting screwdrivers
under both sides of the main spring and lifting upwards
to flush the valve. Manual flushing does not affect
valve adjustments.
Valve Spring
Guide
Top
Retainer
Range
Spring
Insert screwdrivers
underneath the valve
spring guide.
Figure 1: Manual Flushing
I
nspection and Service
After long periods of operation, the valve seat and
rubber disc may become worn, pitted, or wiredrawn,
preventing the valve from completely closing off when
the pressure/temperature is below the setpoint.
!
WARNING:
Personal injury hazard
.
Contents of liquid lines could be
under pressure. Avoid possible
personal injury by shutting off
the liquid supply and relieving
the pressure before servicing
the valve.