IDEAL istor HE260, Installation And Servicing, Page: 41 / 80

41 istor system store -
Installation and Servicing
INSTALLATION
49 GENERAL CHECKS
Make the following checks for correct operation in:
DOMESTIC HOT WATER (DHW) MODE
1.
With no call for CH or DHW the boiler should fire for a
short period to preheat the storage tank.
The LCD display symbol will be:
returning to none when the burner switches off.
Notes.
a.
If no DHW is drawn off, the boiler will fire periodically
for a short time, to maintain the storage tank
temperature.
b. DHW pre-heat will be inhibited during programmed
DHW off periods.
2. Fully open all DHW taps in turn and ensure that water
flows freely from them.
The LCD display symbols will be:
then when the burner lights.
3. Close all taps except the furthest one from the boiler and
check that the boiler is firing at maximum rate.
This is factory set to give a DHW temperature rise of
approximately 35
o C at the flow rate stated on page 6 under
“operation”.
4. Reduce the DHW draw-off rate to about 3 l/min (0.7gpm)
and check that the boiler modulates to deliver DHW at
approximately 65
o C.
5. Close the DHW tap and check that the main burner
extinguishes. The pump should overrun for a few seconds
and the display symbols should read:
When the pump stops the display symbols clear
Note. On systems in excess of 2 bar inlet pressure a water
pressure governor may be required to prevent water
noise.
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 TEMPERATURES
Temperatures can be selected via the CH and DHW
temperature settings (see users guide).
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)
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