XLHP™ High Performance Heat Pump Installation and User’s Guide
17
Temperature Scale - C˚ or F˚
The control board can display temperatures in either
degrees Fahrenheit or Celsius. The temperature scale
in use can be changed from the Service Menu Tree as
described below:
1. Press the UP and DOWN arrows simultaneously.
The Language Selection screen should be
displayed.
2. Then press the MENU SELECT button repeatedly
until the Temperature Scale screen is displayed.
3. Press the UP or DOWN arrows to toggle between
the Fahrenheit and Celsius options. The last option
shown on the display will become active.
Water Temperature Offset
The control board provides the ability to increase or
decrease the displayed water temperature by 2 degrees.
To change the temperature offset:
1. Press the UP and DOWN arrows simultaneously.
2. Press the MENU SELECT button repeatedly until
the Temperature Offset screen is displayed.
3. Press the UP or DOWN arrows to select the
desired offset. The last number shown on the
display will become active.
TEMPERATURE SCALE
FAHRENHEIT / CELSIUS
TEMP OFFSET
OFFSET = -2 TO +2
Defrost Cycle
The XLHP™ Heat Pump may enter a defrost cycle
if air temperatures are around 50°F (10°C). To enter
a defrost cycle the Defrost feature must be enabled
in the Operator Menus.
Heat only pumps utilize a
passive defrost cycle. Heat and cool pumps use
the hot gas cycle by default, but can use either.
Passive Cycle
The passive defrost cycle initiates when the evaporator
sensor detects refrigerant temperature below
the defrost set point. At this time, the heat pump
compressor stops. The heat pump evaporator fan will
continue to run, and will draw air over the evaporator
fins for about 15 minutes.
If the refrigerant sensor detects a temperature above
the defrost stop temperature (start set point +20˚F),
the compressor will restart after the 15 minutes. If not,
the unit will shut down.
Hot Gas Cycle
The hot gas defrost cycle initiates when the evaporator
sensor detects refrigerant temperature below the
defrost start set point. At this time, the heat pump
compressor stops. The heat pump evaporator will
continue to run, and draw air over the fan fins. After
a short delay the reversing valve will activate and the
compressor will restart. This action directs heated
refrigerant into the evaporator to quickly thaw the coil.
The compressor will restart after about 10 minutes.
The heat pump will not initiate another defrost cycle
for a period of 45 minutes, regardless of the refrigerant
temperature.
Note: The efficiency of a heat pump decreases as
air temperature decreases. For maximum efficiency,
operate the heat pump during the warmest time of day.
Heat Pump
Control Panel
Locking the Control Panel
1. Heat pump control panel lock-out – To prevent
unwanted adjusting or manipulating of the heat pump
settings, the control panel can be locked. Once locked,
if any button is pressed, the display will read:
•
To activate the control panel lockout, press the
MENU SELECT and TANK1/TANK2 buttons
simultaneously.
• To unlock the control panel, press the
MENU SELECT and TANK1/TANK2 buttons
simultaneously.
HEAT PUMP
CONTROLS LOCKED