Supplied By www.heating spares.co Tel. 0161 620 6677
2.5
Flue
2.5.1. The flue can be to the right, left or rear.
2.5.2. The flue terminal, on the outside wall, must not be
obstructed or damaged.
2.5.3. A terminal guard, Type K2 - GC 393 553, is available from
Tower Flue Components, Vale Rise, Tonbridge TN9 1TB
2.5.4. An internal flue fitting kit is available. Fitting instructions
are given in Section 11.9.
2. 6.
Controls
2.6.1. Control knob for switching the appliance On or Off.
2.6.2. Control knobs for adjusting the CH or DHW temperatures.
2.6.3. CH control knob switches the CH off and on.
2.6.4. A programmable room thermostat or a facia mounted
programmer or clock is available.
2.6.5. A radio frequency room thermostat is available.
2.6.6. A mains voltage room thermostat and/or an externally mounted
mains voltage programmer may be connected to the appliance.
2.7.
System
2.7.1. All dirt
must
be flushed from the system before
connecting the appliance.
2.7.2. The connections in the system must withstand a pressure
of upto 3bar.
2.7.3. Radiator valves must conform to BS2767:10:1977.
2.7.4. Table 3 gives the pump head available for the system and
the required temperature differential.
2.7.5. A drain cock must be fitted to the lowest point of the system.
2.7.6. An air vent should be fitted to the highest point of the system.
2.8.
Showers, Bidets, Taps and Mixing Valves
2.8.1. All taps and mixing valves must be suitable for the
available mains pressure and temperatures upto 65°C. It may be
necessary to fit a pressure reducing valve.
2.8.2. Hot and cold mains fed water can be supplied to overrim
bidets but is subject to local water company requirements.
2.8.3. The flow of water from individual outlets varies on all
mains fed systems that are not fitted with flow balancing valves.
2.8.4. If a pressure equalising valve is fitted then the domestic
hot water temperature should be set to maximum.
2.8.5. Thermostatically controlled shower valves give extra
comfort and protection.
2.9.
Safety
2.9.1. The appliance must not be operated with the inner casing
cover removed.
2.9.2. The gas and electricity supplies must be turned off before
servicing or working on the appliance.
2.9.3. Temperature monitoring controls are fitted to prevent overheating.
2.9.4. Automatic frost protection is provided which will protect
the appliance when no heat demand is present.
2.9.5. Automatic pump seizure protection is provided.
2.9.6. The gas valve solenoids are successively and alternately closed
to check for gas tightness by reference to the flame cut-off time.
2.10.
Operation
2.10.1. Central Heating:
A demand for heat will ignite the burner and it will operate at
minimum pressure for 2 minutes before increasing to the maximum
over a period of 1 minute and then automatically match the system
requirements. At the end of the demand the burner will go out and
the pump will continue to run for upto 4 minutes or the fan for 15
seconds. There is an anti-cycle time of 3 minutes.
2.10.2. Domestic Hot Water:
A demand for hot water will light the burner with the pressure
rising to maximum over a period of 4 seconds. At the end of the
demand the fan will continue to run for 15 seconds if neither
pump is operating. There is an anti-cycle time of 10 seconds.
The demand for hot water will override the CH function for the
period of the hot water demand. In winter when the inlet water
temperature is very low it will be necessary to reduce the flow at
the taps to maintain the delivery temperature.
1. Mains ON/OFF Control Knob
2. Central Heating Temperature Control Knob and CH ON/OFF
Control
3. Domestic Hot Water Temperature Control Knob
4. Programmer/Clock Position - (Optional)
5. System Pressure Gauge
1. Primary Heat Exchanger
7. Water Flow Regulator
2. Sealed System Expansion
8. Flow Switch
Vessel
9. Domestic Hot Water Heat
3. Central Heating Pump
Exchanger
4. Domestic Hot Water
10. Primary Flow Manifold
Pump
5. Relief Valve
6. Bypass Adjuster
A. Domestic Hot Water Flow C. Central Heating Flow
B. Cold Water In D. Central Heating Return
3
0
MAX.
MAX.
MIN.
F
ig. 1. Facia Controls
1
2
3
4
5
Fig. 2. Water Flow Diagram
A
B
C
D
3
4
5
6
9
8
7
10
1
2
