A.O. Smith SGE - 40, Installation, User And Service Manual

Page: 68 / 119

Instruction manual SGE 65
gis
10 Shutting down
10.1 Introduction
This chapter describes:
•
Decommissioning the water heater for a short
period.
• Isolating the water heater from the mains;
• Decommissioning the water heater for a long
period.
10.2 Decommissioning the water heater for
a short period
To decommission the water heater for a short period,
you must activate the frost protection.
The frost protection will prevent water from freezing in
the water heater.
Activate the frost protection as follows:
1. Press button
to select the main menu.
2. Using and , place the cursor beside
OFF
.
Confirm with .
The frost protection cuts in when the water
temperature drops below 5°C. The text
FROST
will
then appear on line one of the display. The water
heater will heat the water to 20°C (T
set
) before
dropping back to mode
OFF
.
Note
These values of 5°C and 20°C cannot be adjusted.
Caution
The anode protection remains active when the
OFF mode is selected.
Note
If the water heater is not used for longer than two
months and the water is not drained, air bubbles may
form in the water heater. This can lead to air in the
water pipes.
10.3 Isolating the water heater from the
mains
The water heater may only be isolated from mains
power in the correct way. The correct procedure is as
follows:
1. Activate the
MENU
with .
2. Position the cursor in front of
OFF
.
3. Confirm
OFF
with .
Caution
Failure to wait until the fan stops can cause
damage to the water heater.
4. Wait until the fan has stopped. The icon is then
dimmed.
5. Switch the water heater OFF (position 0) using
the ON/OFF switch on the control panel.
6. Isolate the water heater from the power supply by
setting the isolator between the water heater and
the mains power supply to position 0.
Note
Setting the main switch between the water heater
and the electricity mains to 0 will switch off the power
supply to the potentiostat; there is then no longer any
anode protection.
10.4 Decommissioning the water heater for
a long period
Drain the water heater if you are decommissioning it
for a long period. Proceed as follows:
1. Isolate the water heater from the power
supply (10.3 "Isolating the water heater from the
mains").
2. Shut off the gas supply.
3. Close the stop valve in the hot water pipe.
4. Close the supply valve of the protected cold supply
set-up.
5. Open the drain valve
6. Bleed the water heater (or installation) so that it
drains completely.
OFF
13:45 Thursday 6ÉC
FROST PROTECTION
ACTIVATED
MENU
»OFF
^ ON
È WEEK PROGRAM