joule HHH-AEHP-00001, Installation & Maintenance Manual

Page: 55 / 116

55
Modul-AIR Exhaust Air Heat Pump Installation Guide
Filling & Venting the Modul-AIR & Green Comfort
While flushing the heating circuit, it is essential to
flush each emitter separately. As most emitters will
be piped down from the main runs at ceiling level,
this helps remove all air pockets from each leg.
During the flushing process it is important to
regularly release air from the heat pump.
4. Valve C can be intermittently opened and
closed to remove air pockets within the
fill and flush valve body. Ensure valve C is
always returned to the closed position while
flushing the system.
5. After 45 min, if all air has been removed from
the system, Valve B should be closed, and
the pump allowed to pressurise the system.
The recommended pre-charge pressure is
between 1.5 and 2.0 bar.
6. When the pre-charge pressure has been
reached, Valve A should be closed.
If the pre-charge pressure has exceeded 1.5 bar,
Valve B can be opened to allow system pressure
to be reduced.
7. Valve C is now opened to allow for normal
system operation.
8. The fill and flush pump may now be
switched off and the hoses disconnected.
The blanking caps can now be replaced on
Valves A & B.
If the Heat Pump configuration has a Hot Water Tank, it is essential to Power On the Heat Pump and run the
Purge function. This is also true if there is a Green Comfort module installed. The Purge function is designed
to vary the pump speed while alternating the 3-port valve(s) inside the unit(s). This function is particularly
useful as the Hot Water Tank’s coil and/ or the GC module Heat Exchanger cannot be completely vented
during the system flushing.
A
B
C
Water
flow
Water
flow
Water
flow
Water
flow
Water
flow
Water
flow
A
C
B
A
C
B
A B
C