33
INSTALLATION
isar + programmer -
Installation and Servicing
WATER TEMPERATURES
Temperatures can be selected via the CH and DHW
temperature settings (see users guide).
41 GENERAL CHECKS - continued
Setting
CH Flow
DHW Outlet
Temp
Temp
o
C (
o
F)
o
C (
o
F)
Max
82 (180)
65 (150)
Min
30 (86)
42 (110)
CENTRAL HEATING (CH) & DOMESTIC HOT WATER (DHW)
MODE.
1.
Ensure that the CH external controls are calling for heat.
The LCD display symbols should be:
2.
Fully open a DHW tap and check that hot water is
delivered.
The LCD display symbols should be:
3. Gas Rate
Check the boiler gas rate when the boiler is at full DHW
output.
Check at the gas meter, with no other appliance in use.
Refer to Table 3 for gas rates.
4.
Close the DHW tap. The burner should go off and the
pump continue to run.
The LCD display symbol should be:
then
After 15 seconds the burner should relight, to supply
central heating.
The LCD display symbols should be:
5.
Set the central heating external controls to OFF. The
burner should go off and the pump continue to run for a
few seconds.
The LCD display symbols should be:
returning to none when the pump stops.
6.
Check the correct operation of the programmer (if fitted)
and all other system controls. Operate each control
separately and check that the main burner responds.
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 flushing process.
Note
.
A flushing solution should be used during the flushing
procedure. Flushing solutions: Fernox Superfloc,
Sentinel X300 (new systems) or X400 (existing
systems). Refer to Frame 6.
4.
Refill and vent the system, add inhibitor (see Frame 6),
clear all air locks and again check for water soundness.
Affix the water treatment warning label, supplied in the
hardware pack, in a
prominent position
on the system, to
prevent the use of incorrect water treatment additives.
5.
Reset the system initial pressure to the design
requirement.
6.
Balance the system. Refer to Frame 5.
7.
Check the condensate drain for leaks and check that it is
discharging correctly.
8.
Finally, set the controls to the User's requirements.
Note
.
The pump will operate briefly as a self-check once
every 24 hours in the absence of any system demand.
INST
ALLA
TION
202851-1new.pmd
17/11/2006, 07:40
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