17
RG66002124 - Rev 05
All copying, even partial, of this manual is strictly forbidden
MCA
12
WATER CIRCUIT
When setting up the water circuit of the unit, it is advisable to follow the
directions below and in any case comply with local or national regulations.
Connect the pipes to the chiller using flexible couplings to prevent the
transmission of vibrations and to compensate thermal expansions.
It is recommended to install the following components on the pipes:
- Temperature and pressure indicators for routine maintenance and monitoring
of the unit. Checking the pressure on the water side will enable you to verify
whether the expansion tank is working efficiently and to promptly detect
any water leaks within the equipment.
- Traps on incoming and outgoing pipes for temperature measurements,
which can provide a direct reading of the operating temperatures.
- Regulating valves (gate valves) for isolating the unit from the water circuit.
- Metal mesh filter (incoming pipes), with a mesh not to exceed 1 mm, to
protect the exchanger from scale or impurities present in the pipes.
- Air vent valves, to be placed at the highest points of the water circuit for
the purpose of bleeding air. (The internal pipes of the unit are fitted with
small air vent valves for bleeding the unit itself: this operation may only be
carried out when the unit is disconnected from the power supply).
- Drainage valve and, where necessary, a drainage tank for emptying out the
equipment for maintenance purposes or when the unit is taken out of
service at the end of the season. (A 1" drainage valve is provided on the
optional inertial storage reservoir: this operation may only be carried out
when the unit is disconnected from the power supply).
Legend
GA
Vibration-damping coupling (not supplied)
D
P
Differential pressure switch
EV
Evaporator (R407C/water exchanger)
MA
Water pressure gauge
P
Water pump
RR
Circuit filling tap
RS
Circuit emptying tap
VAS
Automatic air vent valve
SIA
Inertial water storage reservoir
VE
Expansion tank
VS
Safety valve
MCA - CB
from the system
to the system
RR
VS
EV
D
P
MA
VAS
IN
OUT
RS
RR
VS
EV
D
P
P
RS
MA
VAS
IN
OUT
SIA
VE
It is of fundamental importance that the incoming water supply is hooked up
to the connection marked "Water Inlet"
Otherwise the evaporator would be exposed to the risk of freezing since the
antifreeze thermostat would not be able to perform its function; moreover the
reverse cycle would not be respected in the cooling mode, resulting in
additional risks of malfunctioning.
The dimensions and position of plumbing connections are shown in the
dimension tables at the back of the manual.
The water circuit must be set up in such a way as to guarantee that the
nominal flow rate of the water supplied to the evaporator remains constant
(+/- 15%) in all operating conditions.
A standard feature of MCA units is a device for controlling the flow rate (flow
switch or differential pressure switch) in the water circuit in the immediate
vicinity of the evaporator.
RR
VS
EV
D
P
P
MA
VAS
IN
OUT
RS
VE
MCA - CP
MCA - CS
from the system
to the system
from the system
to the system
