HA4AO OUTLET PRESSURE
REGULATOR
OPERATION
Outlet pressure is channeled
through an external sensing
tube to the outlet pressure
control module. The outlet
pressure is introduced to
the space under the control
module diaphragm. When
outlet pressure decreases
below the outlet pressure
s e t t i n g t h e r a n g e s p r i n g
forces the control module to
open further. As the control
module opens, more inlet
pressure enters the space
on top of the piston forcing the main valve seat to open
further and regulate flow. As outlet pressure rises the
control module reduces the inlet pressure to the piston
and the main valve seat starts closing. The external
sensing tube on the 5" & 6" valves must be customer
supplied and field installed. A 5 psid (.35 bar g) closing
spring is standard on ¾" through 1¼" valves. A lighter
spring is available for applications where a low pressure
drop is required, such as holdback or crankcase pressure
regulators.
ADJUSTMENT
Connect a pressure gauge via a gauge valve to the
outlet gauge port located on the outlet pressure control
module or the pipe after the regulator. With the control
module range spring at minimum force (control module
stem turned counterclockwise) operate the refrigeration
compressor. Turn the control module stem clockwise
until the desired outlet pressure is achieved. Available
in Range: B, 30 to 300 psig (2 to 21 bar g); or vacuum
range V, 20" to 130 psig (– 0.67 to +9 bar g).
HA4AB REGULATOR WITH ELECTRIC
WIDE OPENING
OPERATION
W h e n t h e s o l e n o i d
control module is de-
energized, this control
operates in the same
manner as the HA4A
Standard Regulator or
other pilot functions.
When energized, inlet
p r e s s u r e b y p a s s e s
the constant pressure
c o n t r o l m o d u l e a n d
e n te r s t h e s p a c e o n
top of the piston which
forces the main valve seat to open wide to permit flow
in the direction of arrow.
ADJUSTMENT
With solenoid control module de-energized, follow
adjustment procedures for the HA4A Standard Regulator.
See page 8.
HA4AS REGULATOR WITH
ELECTRIC SHUT-OFF
OPERATION
W h e n t h e s o l e n o i d
c o n t r o l m o d u l e i s
energized, this control
operates in the same
manner as the HA4A
Standard Regulator or
other pilot functions.
W h e n d e - e n e r g i z e d ,
valve closes tight to
stop flow in direction
of arrow regardless of
pressure setting on the
control module.
ADJUSTMENT
Energize the solenoid control module and follow the
control module adjustment procedures for the HA4A
Standard Regulator. See page 8.
HA4AD DUAL PRESSURE
REGULATOR
OPERATION
W h e n t h e s o l e n o i d
c o n t r o l m o d u l e i s
energized, this valve
operates in the same
manner as the HA4A
Standard Regulator or
other pilot functions.
W h e n t h e s o l e n o i d
control module is de-
energized, the inlet
pressure is channeled
to the higher-setting
inlet pressure control
module and operates
in the same manner as the HA4A regulator. When inlet
pressure rises above the higher setting, the control
module opens to allow inlet pressure to enter the space
on top of the piston which forces the main valve seat to
open and regulate flow. Typically used as a combined
evaporator pressure regulator and defrost internal
relief valve.
ADJUSTMENT
Connect a pressure gauge via a gauge valve at the gauge
port on the regulator adapter. With the solenoid control
module de-energized, adjust the constant pressure
control module in the P port for the high-pressure
setting. This may require a warm room or hot gas supply
to the evaporator. Then, energize the solenoid control
module located on the series SI port and adjust the
constant pressure module in the series SII port for the
low-pressure setting. For control module adjustment,
follow the adjustment procedures for the HA4A Standard
Regulator. See page 8.
HI
LOW
(
)
MS PILOT
AR3 BODY
M3B PLUG
AR3 BODY
M3W PILOT
(OR OTHER)
MS PILOT
M3O PILOT
AR1 BODY
MS PILOT
M3S PLUG
M3W PILOT
(OR OTHER)
AR3 BODY
9
R429d
AUG 2015