Starting And Running; Introduction; The Appliance's Heating Cycle - A.O. Smith GWV - 120 Installation And Service Manual

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9
9.1

Introduction

Topics covered in this chapter, in sequence:
• Starting and running.
• The appliance's heating
9.2

Starting and running

Start the appliance as follows:
1. Fill the appliance (5 "Filling").
2. Open (3.5 "Installation diagram")
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.
G ENESIS
IMD-0511 R1
The display will now show INTERNAL CHECK for
about 10 seconds and go to the main menu.
a
INTERNAL CHECK
a
MENU
»OFF
^ ON
È WEEK PROGRAM
5. Press the blue arrow once ( ) to position the
cursor in front of ON and press
display shown in the figure will appear.
Instruction manual GWV
Starting and running
cycle.
the manual gas
. The
a
»START OPERATION
^ CHANGE SETPOINT
È Tset=65ÉC
6. Confirm the START OPERATION by pressing
.
The appliance is now in "ON mode". If there is a
heat demand, the appliance will run through the
heating cycle (2.3 "The appliance's heating
cycle").
If the heating cycle is not run, there is no heat
demand; if this is the case, Tset will probably need
to be set (11.4 "Setting the water
9.3

The appliance's heating cycle

The appliance's heating cycle is activated when the
measured water temperature (T
threshold value (T ). This set point value depends on
set
the currently selected appliance operating mode. If the
appliance is in the "OFF mode" (frost protection), for
example, this value is 5°C. If the appliance is in the
"ON mode", this set point can be selected, for
example, 65°C.
The heating cycle runs successively through the
following states:
1. HEAT DEMAND;
2. PRE-PURGE;
3. PRESSURE SWITCH;
4. PRE-GLOW;
5. IGNITION;
6. RUNNING 1;
7. RUNNING 2;
8. POST-PURGE.
The complete cycle is explained in the following
example, which assumes the appliance is in the basic
mode ON.
Note
The same heating cycle applies to the other
operating modes.
temperature").
) falls below the
3
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