7
GB 01/2009
AWR MTD - AWR MTD/B
WATER CONNECTIONS
I A
The choice and installation of components is the responsibil-
ity of the installer who should follow good working practice
and current legislation. Before connecting the pipes, make
sure they do not contain stones, sand, rust, dross or other
foreign bodies which might damage the unit. Construction of
a bypass is recommended to enable the pipes to be washed
through without having to disconnect the unit (see drain
valves). The connection piping should be supported in such
a way as to avoid it weighing on the unit. The following com-
ponents should be installed in the water circuit:
1. Two pressure gauges with a suitable scale (intake and
outlet);
2. Two vibration damper joints (intake and outlet);
3. Two shut off valves (normal in intake and calibrating in
outlet);
4.
A flow switch (inlet). The flow switch must be calibrat-
ed by the installer to a value equal to 70% of rated
flow.
5. Two thermometers (intake and outlet);
6.
An intake filter must be installed as close as possible
to the evaporator and positioned to allow easy access
for routine maintenance.
7. All the pipes must be insulated with suitable material to
prevent the formation of condensate and heat loss. The
insulating material must be a vapour barrier. Make sure
that the control and shut off devices protrude from the
insulation.
8. At the lowest points in the system, install drain valves for
easy emptying.
9. At the highest points in the system, install automatic or
manual air vent valves.
10. The unit is fitted as standard with an expansion vessel;
make sure this is correctly sized for the water content of
the system and the expected operating temperature, oth-
erwise install an additional expansion vessel.
Failure to install the flow switches will mean the heat
exchangers are not protected in the event of no flow of liq-
uid.Climaveneta cannot be held liable for any damage to the
unit and/or the system following the failure to install these
devices or the filter.
The correct operation of the components that help ensure
the safety of the appliance and the system should be
checked regularly.
Specifically, this involves cleaning the filters and checking
the operation of the flow switches installed.
Make sure that the frost protection heaters on the heat
exchanger are powered when the unit is off (unit in standby
“StbY”)
Water flow to the chiller unit must conform to the values
shown in the section on “General Technical Data”.
The flow of water must be maintained constant during oper-
ation.
The water content of the unit must be such as to avoid dis-
turbing operation of the refrigerant circuits.
The unit must be prevented from freezing at outside air tem-
peratures around 0°C.
It is recommended to use suitable percentages of antifreeze
(see “Water circuit data”), protect the piping with heating
sheaths, and empty the system, making sure there no water
remains at the lowest points in the circuit.
It is recommended to use non-toxic food grade antifreeze,
compliant with the standards in force in the countries where
the unit is used, if domestic hot water production is also fea-
tured.
Factory connections
Installer connections
1
2
12
12
13
14
14
UTILITY
RETURN
UTILITY
OUTLET
9
8
7
16
3
11
T
6
16
16
T
6
F
5
4
2
10
1
1
15
9
Utility water circuit connection diagram
1 Pressure
gauge
2
Vibration damper joint
3
Shut off valve
4 Calibrating
valve
5 Flow
switch
6 Thermometer
7 Pump
8 Safety
valve
9 Expansion
vessel
10 Wire mesh filter
11 Unit fill/drain valve
12 Temperature
sensor
13 Differential pressure switch
14 Drain / chemical washing valve
15 Auxiliary
heaters
16 System
vent
