Heating Surfaces; Water Heating Surface; Bleeding - airmaster AM 150 Installation Manual

3.

Heating Surfaces

3.1.

Water Heating Surface

The Airmaster air handling unit DV 1000 can be fitted with
an external water heating surface. AM 300, 500, 800,
900, 1000 and 1200 can be fitted with an internal water
heating surface.
The water heating surface for the DV 1000 is also used to
protect against the formation of ice in the heat exchanger.
The "Virtual Preheat" function is used for this purpose.
Further details are available in the Operator's Manual.
For this option, a motorised valve and an automatic heat
retention thermostat are fitted on the heating surface. The
water heating surface is leakage tested and final inspection
performed according to standards and rules in effect.
The heating unit's delivery flow is connected to the con-
nection fitting marked FREM ("DELIVERY") and the return
flow to the connection fitting marked RETUR ("RETURN").
NB! The dimensioning of pipes and valves and
connection of water to the unit must always be carried
out by an authorised specialist in accordance with
current legislation and regulations.
NB! There must be clean water in the installation for
the internal valves in the water comfort heater to be
able to function optimally without problems.
It is recommended that shut-off valves, a dirt filter and
a line regulating valve be fitted in accordance with the
"External connection" block diagram. It is also recommended
to mount the bleed valve and drain cock for commissioning
and service.
It may be necessary (e.g. in the case of a district heating unit)
to install a pressure differential regulator if the pressure
difference ∆ps exceeds 40 kPa (10 kPa = 0,1 bar). If the
differential pressure ∆p rises above the internal construction
above 40 kPa, the risk of noise from the control valve to the
heating surface increases.
External connection:
Δp s
D
B
A Internal assembly (supplied by Airmaster).
B Shut-off valve (supplied by installation contractor).
C Dirt filter (supplied by installation contractor).
D Line regulating valve (supplied by installation contractor).
E Pressure differential regulator (supplied by installation
contractor).
F Bleed valve (supplied by installation contractor).
G Drain cock (supplied by installation contractor).
Internal construction:
In the case of DV 1000, the internal assembly is installed on
the inside of the external heating surface. In the case of AM
products, the unit must be opened for any connection work.
1
2
1 Return connection. (Delivery connection for the AM 800.)
2 Delivery connection. (Return connection for the AM 800.)
3 Frost protection valve (Comap D3803S) with remote
temperature sensor (Comap Senso RI).
4 Control valve (Comap D3803S) with electric On/Off valve
(Ballerox 43600012).
5 Water heating surface.
6 Airflow.

3.1.1. Bleeding

Open the water throughflow and bleed the system using
the bleed valve (F). After a short time any air noise in the
water throughflow should cease.
NB! The unit must be bled with fully open valves (3 + 4).
8
F TD
E
Δp
A
C
G
3
TC
6
4
M
6
5