Technical data
With the system at the temperature set by the Temperature
Control Knob,on the facia, the burner will cycle to maintain
output to the system.
If the system no longer requires output to maintain the desired
room temperature, the burner will extinguish. The pump will
continue to run for about five minutes to dissipate the residual
heat from the appliance and then switch off.
When the primary water has cooled sufficiently below the
temperature set by the Temperature Control Knob, the burner
will light, pump will energise and process repeated.
HOT WATER AND CENTRAL HEATING MODE:
The appliance will supply heat to the central heating system as
required. A demand for hot water at a tap or shower will override
the central heating function for the period of the hot water
demand.
When hot water is no longer required the burner and pump will
continue to operate until the heatbank is back to the required
temperature.
The appliance will return to the central heating state and its
normal mode of operation.
4
Return Valve
Flow Valve
Water Manifold
(Top Section)
Manual Air Vent
Pressure Relief
Valve
By-Pass
Adjuster
Water to Water
Heat Exchanger
Water Manifold
(Bottom Section)
Water Diverter
Valve
Open Vent
Position
Drain
(Secondary Water)
Circulating
Pump
Drain
(Primary Water)
Heat-Bank
Capacity 60 Litres
Sealed System
Expansion
Vessel
Boiler
2
Gas to Water
Heat Exchanger
Appliance
Cabinet
Central
Heating
Flow
Central
Heating
Return
Domestic
Hot Water
Out
Mains Cold
Water In
Water Filter
Flow Switch
Automatic Air
Vent
Water Flow
Regulator
3
4
5
1
Fig. 1. Appliance water flow diagram.
C.H. Thermostat ZAGAS041 Heatbank Overheat Thermostat ZAGAS044
Safety Temperature Limiter ZAGAS043 H.W. Limit High Thermostat ZAMAJ 223
H.W. Thermostat ZAGAS042
1
2
3
4
5