Hansen HA4A series User Manual

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 ELECTRIC 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 REGULATOR 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.
9
R429d
MAR 2002

Hansen HA4A series Specifications

General

Brand	Hansen
Model	HA4A series
Category	Controller
Language	English