A.O. Smith SGE service manual Starting and running, Starting the appliance

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9 Starting and running

9.1Introduction

Topics covered in this chapter:

•Starting the appliance.

•The appliance's heating cycle.

Note

The first time the appliance is started, you must set (12.9.2 "Setting the heating fluid type in the solar heating system") the heating fluid type of the solar heating system.

Note

The first time the appliance is started, you must enter (12.9 "Solar heating system configuration") the settings of the solar heating system

9.2Starting 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.

5.Press once on the blue arrow () to position the

cursor beside ON, then press :

a

»START OPERATION ^ CHANGE SETPOINT

ÈTset=65ÉC

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").

9.3The appliance's heating cycle

The appliance's heating cycle is activated as soon as the measured water temperature (Tnet) falls below the threshold value (Tset). 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:

a

INTERNAL CHECK

a

MENU »OFF ^ ON

È WEEK PROGRAM

1.HEAT DEMAND;

2.PRE-PURGE;

3.PRESSURE SWITCH;

4.PRE-GLOW;

5.IGNITION;

6.RUNNING;

7.POST-PURGE.

Instruction manual SGE 61