- 13 -
Cont ...
6. The flexible hose and any wiring can be retained in the desired position
using cable ties and the two metal cable retention points on the top left
and right of the tank. See Figs. 10 & 11.
7. The warning pipe should be connected to a suitable drain via a tundish
enabling visual warning of an overflow condition. The overflow fitting is
designed to use 19 to 23 mm diameter plastic waste pipe or connect to
G ¾ threaded pipe. Ensure there is a demountable joint in the pipe to
allow the removal of the unit if needed.
8. Non-return valves, pressure reducing valves and RPZ valves
MUST
NOT
be installed between the unit and the heating/cooling system. These
devices will prevent the pressure sensor from reading the system pressure
and will lead to incorrect operation of the unit.
9. The unit should be connected to the system return header along with
the expansion vessels as specified in BS 7074. See Fig. 12.
4.16
Typical installation diagram:
4.17
Vessel sizing & location:
1. System expansion vessel sizing should comply with the BS 7074 Expansion
Vessel sizing calculation.
2. The pressurisation unit and expansion vessels should be connected to the
system at the same point, to provide a neutral pressure reading.
3. A lockshield valve and drain valve should be installed at the inlet of each
expansion vessel to allow for servicing.
Fig. 12
Fig. 13
Unimat or Duomat
Warning
pipe
Drain
valve
Isolation
valves
Expansion
vessel
Return
header
Lockshield
valve
Drain valve
Summary of Contents for Unimat-E Series
Page 35: ...35 Cont NOTES...
