A.O. Smith SGS - 100, Installation & Service Manual

Page: 57 / 110

Instruction manual SGS 57
gis
8 Status of the
appliance
8.1 Introduction
Topics covered in this chapter:
•
Operating modes ;
• Error conditions ;
• Service condition .
8.2 Operating modes
When running, the appliance has four basic operating
modes, namely:
•
OFF
•
ON
•
EXTRA
•
PROG
8.2.1
OFF
In this mode, the frost protection is activated. The
figure shows the display with the following information:
•
line one: the text
OFF
;
• line two: the time, the day and alternately (9.3 "The
appliance's heating cycle") T
1
and T
net
.
• lines three and four: the text
FROST PROTECTION ACTIVATED
.
8.2.2
ON
In this mode, the appliance continually responds to the
hot water demand. The figure shows the display with
the following information:
•
line one: the text
ON
;
• line two: the time, the day and alternately (9.3 "The
appliance's heating cycle") T
1
and T
net
.
• line three: the programmed water temperature
T
set
;
• line four: blank when the appliance is idle, or
depending on the heating cycle
(9.3 "The
appliance's heating cycle") , displays a text such as
HEAT DEMAND
.
8.3
EXTRA
In this mode, one extra period is programmed and
activated. In this mode, the
OFF
or
PROG
mode is
temporarily overruled to fulfil a single period of demand.
Once the period has passed, the appliance automatically
returns to the previous operating mode. The figure shows
the display with the following information:
•
line one: the text
EXTRA
;
• line two: the time, the day and alternately (9.3 "The
appliance's heating cycle") T
1
and T
net
;
• line three: the switch-on time, and the related
water temperature setting;
• line four: the text
PERIOD ACTIVATED
.
8.3.1
PROG
In this mode a preset week program is active, and the
appliance responds continually to demand within the
time periods set in the week program. There are two
distinct situations possible in this mode:
1. The current time falls within a set time period
of the week program.
The figure shows the display with the following
information:
-
line one: the text
PROG
;
- line two: the time, the day and T
1
and T
net
alternately (9.3 "The appliance's heating
cycle") ;
- line three: the next scheduled switch-off time
and the water temperature T
set
of the active
period;
- line four: is empty, or depending on the
heating cycle
(9.3 "The appliance's heating
cycle") , a text such as
HEAT DEMAND
.
OFF
13:45 Thursday 6ÉC
FROST PROTECTION
ACTIVATED
ON
13:45 Thursday 67ÉC
Tset 75ÉC
EXTRA
12:30 Thursday 76ÉC
TH 12:45 Tset 75ÉC
PERIOD ACTIVATED
PROG
10:00 Monday 76ÉC
MO 11:15 Tset 75ÉC
PROG
12:00 Monday 76ÉC
MO 11:15
PERIOD ACTIVATED