4
All components for sealed system central heating are built-
in.
A suitable filling loop should be fitted externally
to comply with water supply regulations (not
supplied).
Heating and hot water functions will operate
independently but not simultaneously, with priority always
to hot water production unless this function is not
selected.
3.2 PRINCIPLE COMPONENTS
•
Insulated steel boiler unit with immersed stainless steel
elements INCOLOY800.
•
50 L stainless steel domestic hot water store with CFC
free insulation and immersed stainless steel elements
INCOLOY800.
•
Fully integrated electronic control boards featuring
temperature control and modulation function, pump
over-run, anti-seize and frost protection. Self-diagnostic
fault information.
•
Sealed system heating components: circulating pump,
6L expansion vessel, auto air-vent, 3 bar relief valve,
pressure gauge, water flow switch and temperature
limit safety thermostat.
•
Unvented hot water components: 7 bar relief valve, 3L
expansion vessel, non-return valve and temperature
limit safety thermostat.
•
Silent TRIAC power switches.
•
Digital control board.
3.3 KEY TO COMPONENTS
1 DHW resistance.
2 Drain valve.
3 Temperature sensor location.
4 Connection block.
5 Main contactor.
6 DHW 7 bar relief valve.
7 Insulated tank 50L.
8 Anti-electrolysis DHW hose.
9 DHW expansion vessel 3L.
10 Automatic purge.
11 DHW power electronic PCB
12 Heating power electronic PCB
13 Heating flow detector.
14 Heating expansion vessel 6L.
15 Circulation pump.
16 Insulated heating header tank.
17 Heating resistance.
18 Heating safety thermal limit switch.
19 ON / OFF switch.
20 Heating 3 bar relief valve.
21 Pressure gauge.
22 DHW safety thermal limit switch.
23 Main electronic PCB.
3.4 SAFETY DEVICES
Safe operation under various conditions is ensured by the
following controls fitted inside the boiler:
o
Water flow switch that monitors water flow in the
heating system and will prevent operation in case of a
blockage, if the system flow rate is below the
permitted level, error E3 will appear. Installation of a
system by-pass may be necessary (see 7.3 HEATING
SYSTEM FLOW SWITCH
–
E3 ERROR & SYSTEM
BY-PASS REQUIREMENTS).
o
Hot water high limit safety thermostat will prevent
operation if the temperature exceeds 80ºC. It
requires re-setting manually.
o
Heating system high limit safety thermostat will
prevent operation if the temperature exceeds 100ºC.
It requires re-setting manually.
o
Hot water pressure relief valve will discharge to
relieve excess pressure at 7 bar. (Requires piping to a
safe external discharge point.)
o
Heating system pressure relief valve will discharge to
relieve excess pressure at 3 bar. (Requires piping to a
safe external discharge point.)
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