IDEAL imax W45 Installation And Servicing Manual page 8

2 OPEN VENTED SYSTEM REQUIREMENTS
Detail reference should be made to the appropriate
standards listed on page 4.
The information and guidance given below is not intended to
override any requirements of the above publications or the
requirements of the local authority, gas or water undertakings.
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 Caradon Ideal
Limited. The isolation valves should be fitted as close to the
pump as possible.
The boiler is fitted with an automatic air vent, located in the left
top side of the interior. This air vent must never be shut off, as
this could result in dry firing of the boiler and subsequent
damage to the heat exchanger.
3 SEALED SYSTEM REQUIREMENTS
Note. The method of filling, refilling, topping up or flushing
sealed primary hot water circuit from the mains via a temporary
hose connection is only allowed if acceptable to the local water
authority.
1. General
a. Detail reference should be made to the appropriate
standards listed on page 4. The information and
guidance given below is not intended to override any
requirements of these publications or the requirements
of the local authority, gas or water undertakings.
b. The installation should be capable of working with flow
temperatures of up to 90ºC and a temperature
differential of up to 20ºC.
c. All components of the system, including the heat
exchanger of the indirect cylinder, must be suitable for a
working pressure of 4 bar (60 lbf/in
110ºC. Care should be taken in making all connections
so that the risk of leakage is minimised.
d. The boiler is fitted with an automatic air vent, located in
the left top side of the interior. This air vent must
never be shut off, as this could result in dry firing of
the boiler and subsequent damage to the heat
exchanger.
2. Safety Valve
A spring loaded safety valve
complying with the relevant
requirements of BS. 6759 Pt. 1
must be fitted in the flow pipe
as close to the boiler as
possible and with no
intervening valve or restriction.
The valve should have the
following features:
8
GENERAL
3. Pressure Gauge
4. Expansion Vessel
2 ) and temperature of
Feed/expansion
cistern
Water
level
(cold)
Open vent
System
return
Connections
to boiler
a. A non-adjustable preset lift pressure not exceeding 4 bar
2
(60 lbf/in ).
b. A manual testing device.
c. Provision for connection of a discharge pipe. The valve
or discharge pipe should be positioned so that the
discharge of water or steam is visible, but will not cause
hazard to user or plant.
A pressure gauge covering at least the range 0-4bar must
be fitted to the system. The gauge should be easily seen
from the filling point and should preferably be connected at
the same point as the expansion vessel.
Expansion vessels used must comply with BS. 4814.
Connection to the system must not incorporate an isolating
valve.
Hose unions
Temporary hose
(disconnect after filling)
500mm
minimum
3000mm
Cold
minimum
Feed
System
flow to
pump
Inverted cold
feed entry
ima5351
Additional
stop valve
Double check valve
assembly
(note direction of flow)
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Installation & Servicing