Water Systems & Pipework - Worcester Greenstar Heatslave 12/18 Instruction Manual

8 716 106 252f 30/3/10 12:56
TYPICAL OPEN VENT SYSTEM
E
F
G
C
A - Appliance expansion vessel
B - Extra expansion vessel
C - Automatic bypass valve
D - Drain cock
E - Feed & expansion cistern
TYPICAL SEALED SYSTEM
A
G
B
U
P
C
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE 12/18-18/25-25/32
8 716 106 252f (03/2010)
Page 11
S
1000mm min
R
T
R
L
D
F - Combined feed & expansion
and open vent safety pipe.
G - Appliance
L - Lockshield valve
P - Pressure relief discharge
R
T
R
L
D
WATER SYSTEMS & PIPEWORK
PRIMARY SYSTEM PLASTIC PIPEWORK:
• Any plastic pipework used for the CH system
• Plastic pipework used for underfloor heating
PRIMARY SYSTEM/CONNECTIONS/VALVES:
• Do not use galvanised pipes or radiators.
• All system connections, taps and mixing
• Radiator valves should conform to
R
• All other valves should conform to BS 1010.
T
L L
• On new installations TRVs must be used on
R
T
• An automatic bypass valve must be connected
L L
D
• Drain cocks are required at all the lowest
R - Radiators
S - Static head
• Air vents are required at all high points on the
T - TRV
U - To filling system
OPEN VENT PRIMARY SYSTEM:
• In order to comply with BS 5449 the
• The feed and expansion cistern (E) must be
R
T
L L
• No valve shall be fitted in the combined feed
• The combined feed and expansion and open vent
R
SEALED PRIMARY SYSTEM:
T
L L
• Where the system volume is more than 180
D
• Pressurise the extra expansion vessel (B) to
IMPORTANT: The boiler should not be
allowed t o operat e wit h a ret urn
temperature of less than 40°C when the
system is up to operating temperature.
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.
must be correctly controlled with a
thermostatic blending valve limiting the
temperature of the circuits to approx. 50°C
with 1000mm (minimum) length of copper or
steel pipe connected to the boiler.
valves must be capable of sustaining a
pressure of 3 bar.
BS 2767:10.
all radiators except the radiator where the
room thermostat is sited, this must be fitted
with lockshield valves and left open. All
installations should have TRVs fitted to
radiators within the sleeping accommodation.
between the heating flow and return pipes
where TRVs are used on radiators. This must
be fitted to give at least a 3m circuit when
activated.
points on the system.
system.
combined feed and vent pipe must
be connected to the BSP outlet on the
right hand side of the primary heat exchanger.
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 (E).
and expansion and open vent pipe (F).
pipe (F) must be at least 22mmØ.
litres at 0.5 bar or exceeds 2.65 bar at
maximum heating temperature an extra
expansion vessel (B) must be fitted as close
as possible to the appliance in the central
heating return.
the same figure as the expansion vessel (A)
built into the appliance.
WATER SYSTEMS & PIPEWORK
11