Installing The Safety Assembly; Connecting The Expansion Vessel And Pre-Cooling Vessel; Installing The Pre-Cooling Vessel; (Available As Accessory) - Bosch Worcester AGS 5 Installation And Servicing Instructions

5.4

INSTALLING THE SAFETY ASSEMBLY

For 1-line solar pump station:
B Install the safety assembly on the left.
For 2-line solar pump station:
B Install the safety assembly on the right.
B Install the safety assembly on the solar heating station
together with the gasket supplied (1).
Fig. 8 Installing the safety assembly of 2-line solar pump
station
1 Gasket (21x30x2)
5.5 CONNECTING THE EXPANSION
VESSEL AND PRE-COOLING VESSEL
Do not insulate the pre-cooling vessel
(if fitted) and the expansion vessel, nor the
pipes connecting them to the safety
assembly.
5.5.1

INSTALLING THE PRE-COOLING VESSEL

(AVAILABLE AS ACCESSORY)

A pre-cooling vessel is required:
• If the system is to be used to assist the central heating
system.
• If the system is purely for DHW heating: the solar
fraction is more than 60 %.
The pre-cooling vessel protects the expansion vessel
from excessively high temperatures.
Height
Diameter
Connection
Maximum operating pressure
Tab. 5 Pre-cooling vessel specifications
6 720 643 603 (2011/11)
1
7747006489.13-1.SD
5 litres 12 litres
270 mm 270 mm
160 mm 270 mm
2 x R ¾ " 2 x R ¾ "
10 bar 10 bar
INSTALLING THE SOLAR PUMP STATION
CONNECTING THE PRE-COOLING VESSEL
If the pipeline to the expansion vessel needs to be laid
on a rising incline, an additional air vent must be
installed.
B To protect the safety valve from excessive
temperatures: connect the pre-cooling and expansion
vessels with a tee (¾ " threaded outer with flange
gasket) in the return line 20 to 30 cm above the solar
heating station.
B Secure pipes to and from the pre-cooling vessel with
pipe clamps (4). Mount the pre-cooling vessel
vertically.
B Connect the expansion vessel (5) to the pre-cooling
vessel by means of a copper pipe.
B Seal the connection on the safety valve with a ¾ " cap
(2) (to be provided by the customer).
7747006489.14-1.SD 7747006489.14-1.SD
Fig. 9 Installing the pre-cooling vessel
1 Flexible stainless steel tube from the connection set for the
expansion vessel (available as accessory)
2 Plug on the safety assembly connection
(provided by customer)
3 Pre-cooling vessel
4 Pipe clamp (provided by customer)
5 Expansion vessel
1
2
3
4
5
11