Hansen Technologies HA4A - HA4 AO Outlet Pressure Regulator; Operation; Adjustment; HA4 AB Regulator with Electric Wide Opening

5
INSTRUCTIONS R429d
Dec 2003
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
setting the range spring
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) 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. Ranges available: B, 30 to 300 psig (2 to 21
bar); or vacuum range V, 20" to 130 psig (–0.67 to +9
bar).
HA4AB REGULATOR WITH ELEC-
TRIC WIDE OPENING
OPERATION
When the solenoid
control module is
de-energized, this
control operates in
the same manner as
the HA4A Standard
Regulator or other
pilot functions.
When energized,
inlet pressure
bypasses the
constant pressure
control module and enters the space on 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 10.
HA4AS REGU-
LATOR WITH
ELECTRIC
SHUT-OFF
OPERATION
When the solenoid
control module is
energized, this
control operates in
the same manner as
the HA4A Standard
Regulator or other
pilot functions. When
de-energized, 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 10.
HA4AD DUAL PRESSURE
REGULATOR
OPERATION
When the solenoid
control module is
energized, this valve
operates in the same
manner as the HA4A
Standard Regulator
or other pilot
functions. When the
solenoid control
module is de-
energized, the inlet
pressure is chan-
neled 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 10.