Water Systems & Pipework - Worcester GREENSTAR UTILITY 32/50 Instruction Manual

8 716 109 711 b 07.10 14/7/10
TYPICAL OPEN VENT SYSTEM:
E
150mm max.
H F
M
A
J
A - Appliance.
B - Expansion vessel.
C - Automatic bypass valve.
D - Drain cock.
E - Feed and expansion cistern.
F - Feed and expansion
15mmØ min.
TYPICAL SEALED SYSTEM:
M
P
A
B
G
U
C
J
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR UTILITY 32/50 & 50/70 8 716
109 711B 07.2010
09:59 Page 11
S
1000mm min.
R
T
R
K
L
C
K
D
G - Pressure gauge.
H - Open vent 22mmØ min.
J - Circulating pump.
K - Zone valve.
L - Lockshield valve.
M - Hot water cylinder.
N - Automatic air vent.
N
R
T
R
L
K
D
WATER SYSTEMS & PIPEWORK
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.
PRIMARY SYSTEM PLASTIC PIPEWORK:
• Any plastic pipework used must have a
polymeric barrier, comply with BS 7921and
be 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 approx. 50°C
with 1000mm (minimum) length of copper or
steel pipe connected to the boiler.
R
PRIMARY SYSTEM/CONNECTIONS/VALVES:
T
L L
• 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
R
BS 2767:10.
• All other valves should conform to BS 1010.
T
L L
• On new installations TRVs must be used on
all radiators except the radiator where the
room thermostat is sited, this must be fitted
with lockshield valves and left open. All
D
installations should have TRVs fitted to
radiators within the sleeping accommodation.
• An automatic bypass valve must be connected
between the heating flow and return where
TRVs are used on all radiators, fitted to give
P - Pressure relief
at least a 3 metre circuit when activated.
discharge.
• Drain cocks are required at all the lowest
R - Radiators.
points on the system.
• Air vents are required at all high points on the
S - Static head.
system.
T - Thermostatic radiator
valve (TRV).
OPEN VENT PRIMARY SYSTEM:
U - To filling system.
• The open vent pipe (H) and feed and
expansion pipe (F) 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 (E).
• Ensure adequate space is left in the expansion
cistern for expansion of the system water.
R
• No valve shall be fitted in the open vent pipe
(H) or the feed and expansion pipe (F).
T
L L
• The open vent pipe (H) must be at least
22mmØ.
FULLY PUMPED SEALED PRIMARY SYSTEM:
• A pressure relief valve (P), spring loaded
R
safety valve set to operate at 3bar, must be
fitted to the heating flow pipe as close as
T
L L
possible to the boiler or onto one of the boiler
top 1
• An expansion vessel (B) must be fitted to the
heating return pipe as close as possible to
D
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
• An automatic air vent (N) must be fitted.
1 / " BSP outlets.
2
" BSP outlets.
1 /
2
WATER SYSTEMS & PIPEWORK
11