Heatmaster 201 - Manual (Page 12)

10
ELECTRICAL CONNECTIONS
Electrical supply
The boiler operates on a single-phase supply of 230V/50Hz. You
should install a control box with a double-pole switch and a 6 A fuse
or a 6A circuit breaker externally to the boiler to allow the boiler to
be isolated from the power supply for servicing and repairs.
Conformity
Boiler installation must comply with the prevailing local standards and
legislation.
Safety
The stainless steel tank must be earthed separately.
The power to the boiler must be switched off before
any work is carried out.
HeatMaster ® 201 wiring diagram key
01. Main switch
02. Module AM3-11
03. Module AM3-2
04. MCBA
05. 24V transformer
06. Display
07. Room thermostat
(optional)
08. Low-water-level safety device
09. NTC1 primary temperature sensor
10. NTC2 primary temperature sensor
11. NTC3 hot water temperature sensor
12. NTC4 outdoor sensor
(optional)
13. Summer/Winter switch
14. NTC6 heating outlet sensor
(optional)
15. Heating circulator pump (not supplied)
16. Heating circulator pump (not supplied) for use with 4-way power-
operated valve
17. Charging pump
18. Charging pump
19. Charging pump Booster
20. 4-way power-operated valve
21. Alarm switch
22. Outside gas valve/burner operation switch
23. Hot water mode operating switch
24. Fan (BG 2000-M / 201)
25. Gas valve (BG 2000-M / 201)
26. Gas pressure switch (BG 2000-M / 201)
(optional)
27. Charging circulator pump control relay
Note: The switches have zero voltage.
INSTALLATION
HEATING CONNECTION
The HeatMaster ® has two connections at the rear that can be used
to connect a central heating circuit. Connecting a heating system
may reduce the domestic hot water performance.
WARNING
The power supply to the heating pump for the MCBA is
limited to 250W. In the event of a higher wattage,
provide a relay between the pump and the MCBA.
Expansion
The HeatMaster ® 201 models are equipped with 4 8-litre expansion
vessels. These expansion vessels are sized for hot water operation
only. If a heating system is connected to the primary circuit, calculate
the expansion capacity necessary for the total volume of the heating
system.
(Refer to the technical instructions from a relevant manufacturer of
expansion vessels) .
Example of a single circuit connection
1. 4-way valve
2. Heating pump
3. Non-return valve
4. Isolating valves
5. Safety valve set to 3 bar with pressure gauge
6. Expansion vessel
7. Drain cock
8. MCBA controller, module AM3-11
9. Surface-mounted sensor
(optional)
WARNING
The pimary safety valve is supplied with a plastic tube
connected to the discharge outlet - this is for test
purposes only and should be removed. The safety
valve should be connected to a drain using a metallic
pipe eg. copper.
WARNING
In the case of heating at low temperature, the use of
the kit
(code: 10800099) is required.
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