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Pre-Installation
▶ Offer the pipe to the fitting [2] and tighten the nut [1].
1
5
4
3
Fig. 10 Isolation valve bracket removed for clarity
▶ Use flexible hoses to connect from the boiler isolation valve/s and the
oil pump.
4.4
Water systems and pipework
NOTICE:
▶ The boiler should not be allowed to operate with a
return temperature of less than 30°C when the
system is up to operating temperature.
Primary system plastic pipework:
• Any plastic pipework used for the CH system must have a polymeric
barrier, complying with BS 7921 and installed to BS 5955 with
1000mm (minimum) length of copper or steel pipe connected to the
boiler.
• Plastic pipework used for underfloor heating must be correctly
controlled with a thermostatic blending valve limiting the
temperature of the circuits to approximately 50°C with 1000mm
(minimum) length of copper or steel pipe connected to the boiler,
and a 20K differential must be maintained at the appliance.
Primary system/connections/valves:
• Do not use galvanised pipes or radiators.
• All system connections, taps and mixing valves must be capable of
sustaining a pressure of 3 bar.
• Radiator valves should conform to BS 2767:10.
• All other valves should conform to BS 1010.
• An automatic bypass valve must be connected between the heating
flow and return where TRVs are used on all radiators, fitted to give at
least a 3 metre circuit when activated.
• Drain cocks are required at all the lowest points on the system.
• Air vents are required at all high points on the system.
Open vent primary system (Regular only)
• The open vent pipe (F) and feed and expansion pipe (H) must rise
continuously from the appliance.
• The feed and expansion cistern (E) must be positioned to provide a
static head (S) of at least 1 metre above the highest point in the
heating system to the water level in the feed and expansion cistern.
• Ensure adequate space is left in the expansion cistern for expansion
of the system water.
• No valve shall be fitted in the open vent pipe (H) or the feed and
expansion pipe (H).
• The open vent pipe (F) must be at least 22mmØ.
14
2
Fig. 11 Regular boiler, open vent system layout
[A]
Regular appliance
[A1]
System appliance
[B]
Expansion vessel*
[C]
Automatic bypass valve
[D]
Drain cock
[E]
Feed and expansion cistern
[F]
Open vent 22mmØ min.
[G]
Pressure gauge*
[H]
Feed and expansion 15mmØ min.
[J]
Circulating pump*
[K]
Zone valves
[K1]
Three port valve
[L]
Lockshield valve
[M]
Hot water cylinder
[N]
Automatic air vent
[P]
Pressure relief valve*
[P1]
Pressure relief discharge*
[R]
Radiators
[T]
Thermostatic radiator valve TRV
[U]
To filling system
[NOTE]
* Components included in the System boiler
Fully pumped sealed primary system:
• A pressure relief valve (P), spring loaded safety valve set to operate
at 3bar, must be fitted to the heating flow pipe as close as possible to
the boiler or onto one of the boiler top 1" BSP outlets.
• An expansion vessel (B) must be fitted to the heating return pipe as
close as possible to the boiler and pressurised for the system volume
according to the instructions supplied with the vessel.
• A pressure gauge (G), 3 bar minimum, must be fitted to the heating
flow pipe or one of the boiler 1" BSP outlets.
• An automatic air vent (N) must be fitted.
Fig. 12 Regular boiler system layout
Greenstar Danesmoor Utility
6720808218-07.1Wo
6720808218-08.1Wo
K1
ErP
and Utility System
ErP
- 6 720 813 286 (2014/09)
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