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Sight Glass
When the sight glass shows a green indicator, no moisture
is present. When the sight glass shows a yellow indicator,
there is moisture in the refrigerant line. Bubbles can be
observed whenever heat pump cycling causes the
pressure to change up or down.
NOTICE
Equipment Damage!
Failure to remove moisture from system could cause
corrosion within the chiller/heater components, and
degrade performance.
Perform vacuum evacuation of system to remove
moisture.
Low Pressure Bypass
A control that uses a time delay that temporarily bypasses
the low-pressure switch for cold weather start-up. Once the
ARTC-SVX009A-EN
delay opens (times out) the normal controls are put back on
line within the control circuit.
High and Low Ambient Controls
Heat pump systems are designed to work efficiently across
a wide range of ambient temperatures, both high and low.
To maintain proper operation of the compressor in varying
ambient temperatures, a head pressure control system has
been developed. The head pressure control system helps
to regulate the pressure of the refrigerant in the system,
which in turn helps to maintain proper compressor
operation. By controlling the head pressure, the
compressor can operate within its designed envelope,
which helps to confirm that the system is working at its
highest level of efficiency.
Thermal Capacity
The thermal capacity of the heat pump modules is
dependent on the leaving temperature of the fluid
maintaining a minimum fluid flow rate through the BPHE
and keeping debris out of the aircoil. In applications where
it is desired to operate with a lower flow rate or higher
temperature change, consult technical support for
recommendations.
Controls Interface
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