moistureMASTER HX - Page 9

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Roof Cavity Exhausng (oponal)
The Roof Cavity Exhausng includes a switching assembly and allows the system to exhaust the warm air
through the heat exchange unit and recover the heat within the roof cavity when its available. This heat is
only available during the dayme when the sun is shining when heat within the home is minimal. This op-
on is worthwhile parcularly in homes that have a dark coloured steel roof where the heat gain can be
signicant even in winter. Obviously the benets will be greater in some parts of New Zealand than others.
At night this heat source is not available and the exhaust air can be switched back to be sourced only from
within the warmer parts of the home.
For the Roof Cavity Exhausng there are four selecons of operaon.
All air from the roof cavity
All from the house or roof cavity
All from the house
50% from house and 50% from roof cavity
If AUTO is chosen an addional screen appears with a temperature selecon. This is the temperature in
which the exhaust damper will change its seng to draw exhaust air from the house or roof cavity. This can
be adjusted by placing the cursor next to Exhaust Set and highlighng it by pressing the SELECT buon. Se-
lect the temperature by pressing the + or - buon. When AUTO is not selected the Exhaust Set selecon
and temperature will disappear from the screen.
Summer By-pass (oponal)
The Summer Bypass includes a damper assembly which allows the supply fresh outside air directly into the
home without going through the heat exchange system. Heat will not be recovered from the warmer inside
air of the home so no further heat will be picked up through the heat exchange process. When the Summer
Bypass is “o” the air is switched back to run through the heat exchanger again.
N.B. The summer bypass is not recommended if your home is “air condioned” and it is being used to cool
the inside air. In this case the heat exchanger will act in reverse by cooling the warmer fresh incoming air
before it is introduced.
In the Summer Bypass mode there are three selecons of operaon.
All Fresh air passes through the HX Unit
All Fresh air by-passes through the HX Unit