10
Precautions and preparations listed are for general knowledge and to define basic guidelines. Local codes and existing practices should be observed and preformed by a professional.
Due to Ice Air’s ongoing product development programs, the information in this document is subject to change without notice.
Sequence of Operation for Hybrid Heat Pump
Cooling Cycle
The thermostat calls for Cooling; the cooling motorized valve is
OPEN, while the heating motorized valve remains closed.
• This sends a 24-volt signal through the cool terminal to the
compressor contactor and the compressor starts.
• At the same time a 24-volt signal flows through the fan relay
and the blower starts in HIGH speed if the unit is in Auto Fan
Mode. If the unit is a manual mode set by the user then the fan
continuously blows in the user set speed.
• Once the thermostat is within 2 degrees of set point, the fan
drops to LOW speed if in Auto Fan Mode
• The thermostat is satisfied and this sends the 24-volt signal to
the compressor contactor and compressor turns OFF.
• This ends the 24-volt signal to the indoor blower relay and the
blower stops if the unit is in Auto Fan Mode.
• This ends the call for cooling.
• The system is now OFF (except in manual cool set by user,
where the fan blows continuously)
• When there is no call for cooling, the motorized valve will remain
open
Heating Cycle
Setting the thermostat to the HEAT mode automatically de-energizes
the heating motorized valve OPEN, while the cooling valve closes.
• A 24-volt signal flows through the fan relay and the blower starts
in HIGH speed if the unit is in Auto Fan Mode. If the unit is a
manual mode set by the user then the fan continuously blows in
the user set speed.
• The system is now in operation.
• Once the ambient temperature is within 2 degrees of the set
point, the fan switches to low speed if the unit is in Auto Fan
Mode.
• As the space warms, the thermostat call is satisfied and ends
the call for heat.
• This ends the 24-volt signal to the blower and the unit stops if
the unit is in auto changeover. If the unit is a manual mode set by
the user then the fan continuously blows in low speed.
• The system is now OFF (except in manual heat set by user, then
the fan blows continuously)
• The heating motorized valve solenoid stays OPEN (de-energized)
as long as the thermostat is set for heating.
PLEASE NOTE:
Other thermostats are available including:
System compatible with other 3
rd
party thermostats not shown here.
For more information go to:
www.ice-air.com/thermostats
Habitat Wireless
Thermostat
Digital Touchscreen
Thermostat
