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

Page: 59 / 110

Instruction manual SGS 59
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9 Starting and running
9.1 Introduction
Topics covered in this chapter:
•
Starting the appliance .
• The appliance's heating cycle .
Note
The first time the appliance is started, you must
enter (12.8 "Solar heating system configuration") the
settings of the solar heating system
9.2 Starting the appliance
Start the appliance as follows:
1. Fill the appliance
(5 "Filling") .
2. Open (3.5 "Installation diagram") the manual gas
valve.
3. Switch on the power to the appliance using the
isolator between the appliance and the power
supply.
4. Switch the electronic controller ON by setting the
ON/OFF switch to position I .
The display will now show
INTERNAL CHECK
for
about 10 seconds, and will then go to the main menu.
Note
The first time the appliance is started, you must
set (12.8.2 "Setting the heating fluid type in the solar
heating system") the heating fluid type of the solar
heating system.
5. Press once on the blue arrow ( ) to position the
cursor beside
ON
, then press :
6. Confirm the selection
START OPERATION
with
.
The appliance is now in "ON mode". If there is a
heat demand, the appliance will run through the
heating cycle
(9.3 "The appliance's heating
cycle") .
If the heating cycle is not run, then there is no
demand; should this happen, then Tset will
probably need to be set
(11.4 "Setting the water
temperature") .
9.3 The appliance's heating cycle
The appliance's heating cycle is activated as soon as
the measured water temperature (T
net
) falls below the
threshold value (T
set
). This threshold value depends
on the currently selected appliance operating mode.
For example, if the appliance is in "OFF mode" (frost
protection), then this value is 5°C. If the appliance is in
"ON mode", then this threshold value is selectable, for
example, 65°C.
The heating cycle runs in turn through the following
states:
1. HEAT DEMAND;
2. PRE-PURGE;
3. PRESSURE SWITCH;
4. PRE-GLOW;
5. IGNITION;
6. RUNNING;
7. POST-PURGE.
INTERNAL CHECK
MENU
»OFF
^ ON
È WEEK PROGRAM
a
a
»START OPERATION
^ CHANGE SETPOINT
È Tset=65ÉC
a