Bosch DANESMOOR UTILITY 32-50 Instruction Manual download pdf (Page 11)

WATER SYSTEMS & PIPEWORK

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR UTILITY 32/50 & 50/70 8 716

109 711B 07.2010

11

PRE -

INSTALLATION

R

TYPICAL OPEN VENT SYSTEM:

A - Appliance.

B - Expansion vessel.

C - Automatic bypass valve.

D - Drain cock.

E - Feed and expansion cistern.

F - Feed and expansion

15mmØ min.

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.

P - Pressure relief

discharge.

R - Radiators.

S - Static head.

T - Thermostatic radiator

valve (TRV).

U - To filling system.

E

1000mm min.

F H

A

R R

R R

D

C

T

L

T

L

T

L

L

L

J

K

M

150mm max.

K

TYPICAL SEALED SYSTEM:

A

D

R R

R

B

P

D

C

T

L

T

L

T

L

L

L

G

J K

M

N

D

U

S

WATER SYSTEMS & PIPEWORK

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.

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.

• 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

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

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:

• 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.

• No valve shall be fitted in the open vent pipe

(H) or the feed and expansion pipe (F).

• The open vent pipe (H) must be at least

22mmØ.

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

1

/

2

” 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

1

/

2

” BSP outlets.

• An automatic air vent (N) must be fitted.

IMPORTANT: The boiler should not be

allowed to operate with a return

temperature of less than 40°C when the

system is up to operating temperature.

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