ARCA MK Series - Terminal Box Connections; Water Storage Cylinder Connections; Running

10
3.3 TERMINAL BOX CONNECTIONS
3.4 WATER STORAGE CYLINDER CONNECTIONS
TP Priority thermostat PI System pump
TA Room thermostat PB
Water
cylinder pump
T.MAX Anti-inertia thermostat (outside)
Following these connections you will have this running:
− the pump runs only if the boiler exceeds the allowed
minimal temperature,
− water cylinder priority, by means of the thermostat TP -
fast reaching of the set point temperature,
− reducing the possible thermal inertia through the water
storage cylinder.
Attention:
TP and T.MAX thermostats are not included in the boiler. They have to be delivered and connected by the
installer.
3.5 RUNNING
Bring all the switches to the position "1", adjust the set point boiler temperature by means of the TR thermostat
(position number 8 on the switchboard). The PI system pumps starts running when the boiler reaches the
minimal temperature. The red light on the switchboard number 5 position will shine.
The possible room thermostat is to be connected to the terminals 15-17 after having taken away the bridge. The
room thermostat acts only on the system pump.
In case of thermal inertia formation the thermostat makes the system pump operate if the boiler temperature
reaches 90°C.
The switchboard of MK and PRK boilers satisfies the demands required by present regulations:
− 73/23/CEE Low voltage;
− 89/336/CEE Electromagnetic Compatibility.