3G.2: Schematic Of The Heating System; Figure 6: The Schematic Of The Heating System - Quantum 67ACW2-134 Owner's Manual

Owners Manual
total amount of water in the condenser, air handling components (such as radiator panels or fan
heater units) and associated piping. If the water volume is too low operational problems can occur
including rapid compressor cycling, erratic refrigerant flow in the water heater, improper motor
cooling, shortened equipment life and other undesirable symptoms.
For normal comfortable heating, where the heating load changes relatively slowly, it is
recommended a minimum system volume of five minutes times the flow rate (LPM). For example,
if the design water heater flow rate is 120 LPM, a minimum system volume of 600 litres (120
LPM x 5 minutes).
Since there are many other factors that can influence performance, systems may successfully
operate below this suggestion. However, as the water volume decreases below this suggestion, the
possibility of problems increases.

3g.2: Schematic of the heating system

The Schematic of the heating system is shown in Fig 6.

Figure 6: The Schematic of the heating system

Heat Pump
Drain
NOTES:
1. There must be a proper expansion tank in the system, and the bottom of the tank should be
500mm higher than the highest point of the hydraulic system.
2. The horizontal supply pipeline from the heater to the building must have 0.01 gradient to
the heater, and at the highest point of the system, there must have an air vent (auto or
manual).
3. The bottom edge of the expansion tank should be higher than the highest point of the
hydraulic system by at least 500mm.
4. The volume of the expansion tank depends on the volume of the system. Roughly, for the
2.7kW and 6.7kW system, a normal 0.3m3 tank is required.
5. The expansion tank must be insulated properly unless it is fitted in the heated space.
6. If the water amount is not sufficient in the system, a storage tank could be required to
prevent the short-cycle of the heat pump.
Document Number : QDC0049PD-5
Expansion Tank
Filling stop cock
Water main
Check Valve
Strainer
Water Pump
Vibration isolator
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