Computherm Q4Z, Operating Instructions Manual

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• 

The 1st and 2nd zones, beside their regular connection points, also have 

a joint connection point for a zone valve/pump (Z1-2). If any of the 1st two 

thermostats (T1 and/or T2) switches on, then beside the 230 V AC voltage 

appearing at Z1 and/or Z2, 230 V AC voltage appears on Z1-2 too

, and the 

zone valves/pumps connected to these connection points open/start. This 

Z1-2 

connection point is suitable to control the zone valves/pumps in such rooms 

(e.g. the hall or the bathroom), which do not have a separate thermostat, do not 

need heating at all times but need heating when any of the 1st two zones heat.

• 

The 3rd and 4th zones, beside their regular connection points, also have 

a joint connection point for a zone valve/pump (Z3-4). If any of the 2nd two 

thermostats (T3 and/or T4) switches on, then beside the 230 V AC voltage 

appearing at Z3 and/or Z4, 230 V AC voltage appears on Z3-4 too

, and the 

zone valves/pumps connected to these connection points open/start. This 

Z3-4

connection point is suitable to control the zone valves/pumps in such rooms 

(e.g. the hall or the bathroom), which do not have a separate thermostat, do not 

need heating at all  times but need heating when any of the 2nd two zones heat.

• 

Moreover, the four heating zones also have a joint connection point 

for a zone valve/pump (Z1-4). If any of the four thermostats (T1, T2, T3 

and/or T4) switches on, then beside the 230 V AC voltage appearing 

at Z1, Z2, Z3 and/or Z4, 230 V AC voltage appears on Z1-4 too

, and the 

pump connected to output 

Z1-4

 also starts. This 

Z1-4

 connection point is 

suitable to control the heating in such rooms (e.g. the hall or the bathroom), 

which do not have a separate thermostat, do not need heating at all times but 

need heating when any of the four zones heat. This connection point is also 

suitable for controlling a central circulating pump, which starts whenever any 

of the heating zones starts. 

• 

There  are  some  zone  valve  actuators  that  need  a  fix  phase,  a  switched 

phase and a neutral connection to operate. The connection points of the fix 

phase are next to the  (

POWER INPUT)

 indicated by the 

FL FL

 sign. The 

connections of the fix phase are only operating when the power switch is 

turned on. Due to the lack of space there is only two connection points. By 

joining the fix phases four actuators can be operated.

• 

The 15  A fuse on the right side of the power switch protects the components 

of the zone controller from electrical overload. In case of overloading the 

fuse cuts off the electric circuit, protecting the componets. If the fuse has cut 

off the circuit, check the appliances connected to the zone controller before