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Minimum Run Time
To ensure the compressor operates efficiently and has a
longer lifespan, the control has set a minimum run time
of 3-minutes. If the setpoint temperature is reached within
3-minutes, the compressor will continue to run for the
remaining time, unless one of the following conditions
occur: (1) the high-pressure switch is tripped, (2) the water-
pressure switch is tripped, (3) the high-temperature limit is
reached, or (4) the user selects the "OFF" mode.
Compressor Start Delay
To prevent the compressor from short cycling, the control
is programmed with a compressor start delay. The
compressor will not be energized unless it has been off
for at least 3-minutes. During this delay, the display will
show "Comp Start Delay", until the 3-minute wait time is
completed and the compressor starts.
Water Pressure Switch
The control system includes a water pressure switch (or
flow switch, if available) that is constantly monitored. If the
compressor is required and the water pressure switch is
open, the control system will prevent the compressor from
starting and display the message "Water PS Open" on the
screen.
Defrost Operation
The control's defrost temperature limits vary depending on
the unit's configuration, whether it is a Heat Only or a Heat/
Cool unit.
The control initiates a defrost cycle when the coil
temperature falls to the "Defrost Temp" limit established
in the Program menu, which is 24°F (-4°C) by default. For
Heat Only models, during the defrost cycle, the compressor
will shut off, while the fan will continue to operate to pull
warmer air across the coil for defrosting.
For Heat/Cool models, during the defrost cycle, the control
shuts off the fan and activates the reversing valve, while
the compressor remains running. This action directs the
hot refrigerant gas to the coil for defrosting.
Once the control sees a rise in the coil sensor temperature
equal to "Defrost Temp" + "Defrost Deadband", which is
10°F (-12°C) by default, or after 15-minutes have passed,
the unit exits the defrost cycle and returns to normal
heating operation based on the current water temperature
and setpoint temperature.
Low Ambient Temperature
- Outside Lockout
The control features a Low Ambient Temperature Lockout
function that prevents operation when the ambient
temperature falls below the "Outside Lockout" temperature
limit. You can access this setting through the Program
menu, and the default value is 45°F (7°C). However, the
temperature limit is adjustable, and you can set it between
30°F (-1°C) and 50°F (10°C) according to your needs.
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High Water Temperature Limit
If the compressor is demanded and the inlet water
temperature is 106°F (41°C) or higher, the control will
prevent compressor start, allow the pump to run, and show
"Hi Water Trip" on the second line of the LCD. The fault
is removed only when the water temperature drops below
106°F (41°C).
In the event that the inlet water temperature sensor reads
at or above 108°F (42°C) while the compressor is running,
the control will shut down the compressors and display
"Hi Water Lockout" on the second line of the LCD. The
compressors will remain locked out until the inlet sensor
reading falls below 103°F (39°C).
This high-temperature limit is active in all modes of
operation, including cooling operation (heat/cool models),
in case of a reversing valve failure. High water temperature
is ignored if there is no demand for the compressor.
High-Pressure Switch Lockout
In the event that the high-pressure switch opens, the
control turns off the compressor output, and the fan will
continue to operate for 15-minutes after the High-Pressure
Switch (HPS) opens. Additionally, the display will show "Hi
Press Trip."
If the high-pressure switch trips 7-times within a single
cycle, the display will show "Hi Press Lockout," and the
unit will be disabled for 4-hours. The unit will automatically
reset after 4-hours, or the lockout can be manually reset by
pressing the MODE key or by power cycling. It is important
to note that the high-pressure switch must remain closed
for a minimum of three-seconds for the control to recognize
that it has closed.
Low-Pressure Switch Lockout
The control has a 30-second grace period after the
compressor is energized during which it will ignore an open
low-pressure switch. However, if the low-pressure switch
remains open for 3 or more seconds after this period, the
compressor will shut down and the display will show "Lo
Press Trip".
In the event that the low-pressure switch trips 6-times
within a single cycle, the control will display "Lo Press
Lockout" and the unit will be disabled for 4-hours. After the
4-hour period has elapsed, the unit will automatically reset.
Alternatively, the lockout can be manually reset by power
cycling the unit. It's important to note that the low-pressure
switch must be closed for at least 3-seconds in order for
the control to recognize it as closed.
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