ACV International
12
5
CONNECTION
5.1
Connecting CH installation
1.
Flush the CH system thoroughly to clean.
2.
Fit the supply pipe (B) and the return pipe (A) to the mounting bracket.
3.
All pipes must be fitted unstressed in order to prevent the pipes from ticking.
4.
Existing connections must not be twisted, in order to avoid leakages.
The CH system should be equipped with:
•
A filling/draining tap (A) in the return pipe immediately below the appliance.
•
A drain tap at the lowest point(s) of the installation.
•
A 3 bar pressure relief valve (B) in the supply pipe at a maximum distance of 500
mm from the appliance.
There must be no valve or constriction between the appliance and the overflow
valve.
•
An expansion vessel in the return pipe.
•
A check valve, if pipes run upwards at a short distance from the appliance. This
avoids the occurrence of thermosiphon effect during DHW operation mode.
5.1.1
Thermostatic radiator valves
If all radiators are equipped with thermostatic or regular radiator valves, a bypass must
be fitted in order to guarantee minimum water circulation. The bypass must be at a
distance of at least 6 m from the appliance in order to prevent overheating of the
appliance.
Appliance with zone regulation.
If there is, next to the CH system another heating source (as for example a stove or a
fireplace) in the living room often the problem occurs that the other rooms cool down.
This can be solved by splitting up the CH system into two separate zones.
The zone regulation can only be used if there is no external DHW tank present (in case
of a system boiler)
Schedule zone-regulation
A.
Appliance
B.
Electrical Shut-off valve 230 V ~
C.
Radiators
T1. Room thermostat zone 1
T2. Room thermostat zone 2
Z1. Zone 1
Z2. Zone 2
Operating principle
The zone regulation contains 2 room thermostats and a shut off valve. When the room
thermostat of zone 2 generates a heat demand, the shut off valve opens and the
complete CH system heats up (zone 1 and 2). When the heat demand of zone 2 is not
or no longer present, room thermostat 1 controls the room temperature in zone 1.
Installation
5.
Place the shut-off valve into the heating system according to the schedule.
6.
Connect the room thermostat of zone 1 on to connector X4 – 6/7.
7.
Connect the room thermostat of zone 1 on to connector X4 – 11/12.
8.
Modify parameter A in the parameter list. (See § 7.3)
INote : The room thermostat for zone 1 must be an on/off type. The room thermostat for
zone 2 an be either on/off or “Open Therm”.
