Electrical Supply - IDEAL HE15 Installation And Servicing

ELECTRICAL sUppLy

Warning.
This appliance must be earthed.
Wiring external to the appliance MUST be in accordance with
the current I.E.E. (BS.7671) Wiring Regulations and any local
regulations which apply. For Ireland reference should be made to
the current ETCI rules for electrical installations.
The point of connection to the mains should be readily accessible
and adjacent to the boiler.
n.B. THE Fan VOLTagE iS 325V DC.
3 OpEN VENT sysTEM REqUIREMENTs
The system should be vented directly off the boiler flow pipe, as close to
the boiler as possible. The cold feed entry should be inverted and MUST be
positioned between the pump and the vent, and not more than 150mm (6")
away from the vent connection.
Note. Combined feed and vent pipes may also be fitted.
There should be a minimum height 450mm (18") of open vent above the
cistern water level. If this is not possible refer to Frame 5. The vertical distance
between the highest point of the system and the feed/expansion cistern water
level MUST not be less than 450 mm (18"). The pump must be fitted on the
flow side of the boiler.
A suitable pump is a domestic circulator capable of providing a maximum 11
(20 F) temperature differential across the boiler with the whole of the heating
o
circuit open (e.g. Grundfos UPS 15/50, 15/60 or equivalent). With the minimum
flow circuit allowed by the controls the differential must not exceed 25
for the HE15)
The vertical distance between the pump and feed/expansion cistern MUST
comply with the pump manufacturer's minimum requirements, to avoid
cavitation. Should these conditions not apply either lower the pump position or
raise the cistern above the minimum requirement specified by Ideal Boilers.
The isolation valves should be fitted as close to the pump as possible.
4 sChEMATIC pIpEWORK AND sysTEM BALANCINg
The boiler does not normally need a bypass but at least some radiators on the heating circuit, of load at least 10% of the
minimum boiler output, must be provided with twin lockshield valves so that this minimum heating load is always available (see
footnote re. thermostatic radiator valves).
Balancing
1. Set the programmer to ON for both CH and HW. Turn the cylinder
thermostat down. Close the manual or thermostatic valves on
all radiators, leaving the twin lockshield valves (on the radiators
referred to above) in the open position. Turn up the room thermostat
and adjust these lockshield valves to give boiler flow and return
temperatures not more than 20
be left as set.
2. Open all manual or thermostatic radiator valves and adjust the
lockshield valves on remaining radiators to give around 11
temperature drop at each radiator.
3. Turn up the cylinder thermostat and adjust the cylinder balancing
valve so that the cylinder achieves a maximum flow consistent with
adequate flow to the radiators. Check that with only the domestic hot
water loop in circuit a differential temperature of 20
boiler is not exceeded.
4. Adjust room and cylinder thermostats and programmer to NORMAL
settings.
10
GENERAL
C apart. These valves should now
o
o
C across the
o
CONDENsATE DRAIN
A condensate drain is provided on the boiler. This drain must be
connected to a drainage point. All pipework and fittings in the
condensate drainage system MUST be made of plastic - no other
materials may be used.
IMpORTANT.
Installation must be in accordance with BS 6798.
The drain outlet on the boiler is sized for standard 21.5mm (3/4")
overflow pipe. It is a universal fitting to allow use of different
brands of pipework.
C
o
C. (18 C
o o
C
mexico HE -
- Refer to Frames 13, 15 and 18
Return & flow
connections
load 30 - 60 = 22 mm
load 70 - 80 = 28 mm
cla7648
Installation & Servicing