42
gENERAL ChECKs
WATER CIRCULATION sysTEM
1. With the system COLD, check that the initial pressure
is correct to the system design requirements.
For pre-pressurised systems, this should be 1.0 bar.
2. With the system HOT, examine all water connections
for soundness. The system pressure will increase
with temperature rise but should not exceed 2.5 bar.
3. With the system still hot, turn off the gas, water and
electricity supplies to the boiler and drain down to
complete the ushing process.
Note: A ushing solution should be used during the
ushing procedure. Flushing solutions: Fernox F3
or DS40, Sentinel X300 (new systems) or X400
(existing systems).
4. Rell and vent the system, add inhibitor (see Frame
24), clear all air locks and again check for water
soundness.
5. Reset the system initial pressure to the design
requirement.
6. Balance the system. Refer to Frame 4.
7. Check the condensate drain for leaks and check that
it is discharging correctly.
WATER TEMpERATUREs
Temperatures can be selected using the CH and DHW thermostats.
Knob setting Ch Flow Temp DhW Outlet Temp
o
C (
o
F)
o
C (
o
F)
Max 80 (176) 65 (149)
Min 30 (86) 40 (104)
8. Finally, set the controls to the User’s requirements.
Notes.
1. If the pump has not operated in the last 24 hours it will run
briey to prevent seizure
2. If the diverter valve has not operated in the last 24 hours
it will be operated briey to prevent seizure. These two
operations will not occur at the same time.
INsTALLATION
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