Shutdown; Setting Frost Protection; Thermal Disinfection; Clearances And Ventilation Information - Worcester GR8700iW 30 S NG User Instructions

6

Shutdown

6.1

Setting frost protection

NOTICE:
Risk of damage to the system from frost!
The heating system can freeze up after a prolonged period (e.g. during a
power failure, switching off the power supply, faulty fuel supply, boiler
fault etc.).
▶ Ensure that the heating system is in constant use (particularly when
there is a risk of frost).
If you are leaving your property unoccupied during cold weather, please
leave your external programmer on constant and your room thermostat
set to 12 °C.
7

Thermal disinfection

To prevent hot water from becoming contaminated by bacteria such as
legionella, we recommend thermal disinfection after long downtimes.
CAUTION:
Risk of scalding.
During thermal disinfection, discharging unmixed hot water can cause
serious scalding.
▶ Only use the maximum adjustable hot water temperature for thermal
disinfection.
▶ Inform occupants of the premises of the risk of scalding.
▶ Perform thermal disinfection outside of the normal operating times.
▶ Do not discharge DHW unmixed.
Proper thermal disinfection involves the DHW system including the
draw-off points.
▶ Set the thermal disinfection in the hot water program of the heating
controller ( heating controller operating instructions).
▶ Close DHW draw-off points.
▶ Set any DHW circulation pump to continuous operation.
▶ Wait until the maximum temperature is reached.
▶ Open all DHW draw-off points, from the nearest to the one furthest
away, and draw off hot water until hot water at a minimum of 70 °C
has flown from all draw-off points for at least 3 minutes.
▶ Restore the original settings.
8

Clearances and ventilation information

8.1

Appliance clearances

Your installer will have provided adequate space around the appliance
for operation, safety and servicing/maintenance access.
• The following detail the necessary clearance around the appliance for
service and maintenance.
CAUTION:
Risk of damage to appliance or property
The appliance will overheat if the clearance space around the appliance
is restricted by objects.
▶ Do not restrict this space with the addition of cupboards, shelves etc.
next to or around the appliance.
▶ Do not store any combustible materials on or next to the appliance,
such as clothes, towels, paper or plastic bags.
Greenstar 8000 Style – 6720883869 (2018/05)
Fig. 7 Appliance minimum clearances
Minimum clearances
Description
X Appliance width
Y Appliance height
Z Appliance depth
Installation/Maintenance
1 Overall clearance height
2 Overall clearance depth
3 In front of appliance
4 Overall clearance width
5 Above the appliance
6 Either side of appliance
7 Below the appliance
8 Compartment depth
9 Appliance to removable door
Table 7
[*] Height for either 60/100 flue or 80/125 flue
8.2

Ventilation information

The air supply must not be restricted or contaminated.
Ventilation considerations
▶ Do not place objects to hinder the air circulation required by the
appliance.
▶ The installation premises may require ventilation to be fitted
according to its features or use.
9

Malfunction or failure

If you believe there is a problem with your central heating or hot water
supply, before you contact your installer/maintenance engineer and
report the error and appliance type carry out the following checks.
Basic checks
Some items to check before placing a call are:
• Is the electrical power switched on to the appliance?
• Is the programmer/timer set to ON or in an ON period?
• Is the room thermostat set too low?
• Is the cylinder thermostat (if fitted) set too low?
Shutdown
Dimensions (mm)
440
780
365
1150/1190
970
600
450
170/210 *
5
200
380
20
11