3.6.2
Drain cocks must be located in accessible positions, which permit the draining of the whole system, including
the appliance and hot water storage vessel. A drain cock should be fitted at the lowest point of the water heating
circuit and, in the case of an indirect system, another must be fitted at the lowest point of the cold feed. Drain
cocks should be at least
1
/
2
in nominal size, and be in accordance with BS28798.
3.6.3
Economy valves can only be used in a DIRECT installation.
Fig. 2a.
Typical JANUS 6/30 Indirect System application.
4
Fig. 2b
Typical JANUS 6/30 Direct System application.
9
7.3
PILOT ASSEMBLY
Note: The relationship between the pilot and thermocouple is critical and must not be disturbed. Do not attempt to
dismantle the pilot assembly. If any part of the pilot assembly is considered defective, the complete assembly must be
replaced.
7.3.1
Remove the Burner and controls assembly as detailed in para 7.2
7.3.2
Disconnect ignition lead from electrode.
7.3.3
Release 2 x screw securing Pilot assembly, and withdraw pilot assembly from main burner mounting bracket.
7.3.4
Release 4mm hook and olive connection from pilot injector.
7.3.5
Release thermocouple connection from Multifunctional control.
7.3.6
Refitment or replacement is in reverse order, ensuring that the thermocouple connection at the Multifunctional
control is not overtightened, (finger tight +
¼
turn only).
7.4
MAIN INJECTOR
7.4.1
Remove Burner and Controls assembly as detailed in para 7.2
7.4.2
Remove Pilot Assembly as detailed in para 7.3
7.4.3
Release main burner lock nut, and unscrew main burner from injector.
7.4.4
Unscrew main injector from injector housing.
7.4.5
Refitment or replacement is in reverse order, ensuring that the main burner is screwed in as close as possible to
the injector shoulder.
NOTE:
If burner is not vertically aligned, the burner and control assembly will not fit into
the water body for re-assembly.
7.5
DRAUGHT DIVERTER
7.5.1
Release flue split collar.
7.5.2
Release 4 x screws securing upper front plate to top cover and withdraw upper front plate.
7.5.3
Release screw securing draught diverter to appliance and withdraw draught diverter and top cover.
7.5.4
Release 4 x screws securing top cover to draught diverter at flue spigot and withdraw draught diverter. (This is
only necessary should the draught diverter require replacement.)
7.5.5
Refitment or replacement is in reverse order.
Note:
When refitting or replacing the draught diverter assembly, ensure the spigot on the assembly engages in the flange
located on the rear of the heat exchanger body.
7.6
HEAT EXCHANGER ASSEMBLY
7.6.1
Remove Burner and Controls assembly as detailed in para 7.2
7.6.2
Remove Draught Diverter as detailed in para 7.5
7.6.3
Drain heating system.
7.6.4
Disconnect water body at flow and return connections.
7.6.5
Remove appliance from wall or floor fixing.
7.6.6
Release 4 x screws securing heat exchanger to appliance casing and withdraw heat exchanger.
7.6.7
Refitment or replacement is in reverse order.
7.7
MULTIFUNCTIONAL CONTROL
7.7.1
Remove Burner and Controls assembly as detailed in para 7.2
7.7.2
Remove the Pilot assembly and main injector as detailed in 7.3 and 7.4
7.7.2
Disconnect the pilot feed pipe and thermocouple capillary from the Multifunctional control.
7.7.3
Release the bolt and nut securing the mounting bracket, and withdraw the bracket.
7.7.4
Refitment or replacement is in reverse order, ensuring replacement ‘O’ ring seal, and transfer of data badge in the
event of replacement.
Feed
tank
Cold water
storage
Hot water
Circulator
Indirect storage
cylinder
Drain
cock
Drain
cock
Circulation
Head
W
orking Head = 20m (65ft) maximum
Feed
Tank
Direct storage
cylinder
Hot water
Circulator
Drain
cock
