4
1 System introduction
1.1 System Schematic
Aqua thermal is an integrated air-to-water space heating and space cooling heat pump system. The outdoor heat pump
system extracts heat from the outdoor air and transfers this heat through refrigerant piping to the plate heat exchanger in the
hydronic system. The heated water in the hydronic system circulates to low temperature heat emitters (floor heating loops or
low temperature radiators) to provide space heating. The 4-way valve in the outdoor unit can reverse the refrigerant cycle so
that the hydronic system can provide chilled water for cooling using fan coil units.
The heating capacity of heat pumps decreases with ambient temperature. Aqua thermal is reserved an auxiliary electric heater
control port to provide additional heating capacity for use during extremely cold weather when the heat pump capacity is
insufficient. The auxiliary electric heater also serves as a backup in case of heat pump malfunction and for anti-freeze protection
of the outside water piping in winter.
1.2 Typical Applications
1.2.1 Space Heating Through Floor Heating Loops
Master unit
Expansion tank
Water replenishment valve
Water discharge valve
Floor
Heating
Loops
Floor
Heating
Loops
Floor
Heating
Loops
Differential pressure
by-pass valve
Drain valve
Two-way valves
Auxiliary electric heater
unit
unit
Y-type filter,
requiring≥ 16 mesh
Slave unit
Max 16 units
Stop valve
Pressure gauge
Gate valve
Flexible joint
Y-shaped filter
Thermometer
Circulating pump
Check valve
Automatic discharge valve
Legend
