IDEAL Evomax 30 Installation & 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 Ideal Stelrad Group.
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 for a non-
domestic property is shown below.
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 90
of up to 20 C.
o
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
110 C. Care should be taken in making all connections so
o
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:
a. A non-adjustable preset lift pressure not
exceeding 4 bar (60 lbf/in
b. A manual testing device.
8
GEnERAL
C and a temperature differential
o
) and temperature of
2
).
2
CV = Control Valve
DT = Drain Tap
Feed/expansion
cistern
Water
level
(cold)
Open vent
System
return
Connections
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.
3. Pressure Gauge
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.
4. Expansion Vessel
Expansion vessels used must comply with BS. EN 13831.
Connection to the system must not incorporate an isolating
valve.
primary flow
and return
Type BA backflow
prevention device
(RP2 valve assembly)
CV
DT
Cold
Feed
to boiler
ima5351
Strainer
seat control
Air
gap
Tundish
EVOMAX -
Installation & Servicing
500mm
minimum
3000mm
minimum
System
flow to
pump
Inverted cold
feed entry
CV
Resillient
valves
Supply
pipe