Commissioning - Vent-Axia HR400 Installation And Servicing Instructions

Cover
18
Filter (optional)
Electrical Plug
Fig. 16
Heat Exchanger
N O
R M
A L
B O
N B
O S
S W
T
NBSW
Fig. 17
PCSW
Fig. 18
HS6
Fig. 19

5.0 Commissioning

5.1 Commissioning the System
Before starting to commission the system check
that the crossflow heat exchanger and the filter
panel (if ordered) are properly and securely in
place (Fig. 16). Check that all sockets are
correctly engaged, that the wiring is secure and
properly mounted and that the unit cover is
secured.
The scope of the commissioning procedure
comprises:
1. Balancing the two airflows to achieve
maximum heat exchanger efficiency.
2. Adjusting the two airflows to obtain the
overall airflow rates and the individual terminal
air flow rates as specified on the air change
schedule.
3. Adjusting the fan speed controller (VCON77)
by increasing or decreasing the voltage setting
to obtain the most economical running costs
and the lowest noise levels attainable within the
parameters of the design concept as specified
on the air change schedule. The 230V tapping
is for BOOST speed operation only. At this
setting, the system will be audible.
4. An airflow meter must be used to set the
correct airflows.
5. Check that there are air gaps under all
internal doors to provide the transfer route of air
from the "living" areas to the "wet" rooms. Close
all windows, outside doors and all fresh air
terminals in windows and walls except the
necessary openings for gas oil heaters and
stoves etc. Fit the cores of the air valves,
ensuring that the correct type of supply and
extract terminal device is used.
NOTE: The supply air terminal device is
directional and incorporates a deflector plate.
Ensure that the deflector plate is correctly
positioned so that the active part of the
terminal device is discharging to the room.
6. Set the control switch (NBSW or PCSW)
(Figs. 17 & 18) to normal speed or set the
humidistat (HS6) (Fig. 19) at maximum and
check that air is flowing in the correct direction
at each terminal point. At this stage it will save
time if all the terminals are fitted and opened to
approximately half way.
7. Commence with the extract system at the
terminal nearest to the fan unit. Adjust and
measure until the airflow for that particular
terminal is achieved at the value indicated on
the air change schedule.