andrews OFS25 Installation Manual, Operation And Service Manual page 19

INSTALLATION
If higher flow rates are required for the cold water services, a suitable tee fitting should
be fitted to the pipework, upstream of item C1.
The pipework fitted to the tundish outlet should be one size larger than the outlet pipe of
the safety device and should be terminated at a suitable drain (see Building Regulations
1991 Approved Document G3).
All fittings and materials must be suitable for use with drinking water and listed in the
current Water Research Centre "Materials and Fittings Directory".
Installation of unvented hot storage water systems must comply with Part G of
Schedule 1 of the Building Regulations 1991.
Typical water service layout for single heater unvented system is shown in Fig. 7.
Front Rear Entry
Models
OFS63
OFS90
OFS108
OFS163
Note: On heater models OFS108 & OFS163 the 2" T/P is located at the rear via a
2" Sq Tee.
Top Entry Models
OFS25
OFS29
OFS108
See Note
SECTION 3
WATER
CONNECTIONS
Fig. 7.
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