Status Of The Appliance; Introduction; Operating Modes; Error Conditions - A.O. Smith ADM-40 Installation, User And Service Manual

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8
8.1

Introduction

Topics covered in this chapter, in sequence:
•

Operating modes;

•

Error conditions.

8.2 Operating modes
When running, the appliance has three basic
operating modes, namely:
• ISOLATED
In this mode the appliance is off and all
components are electrically dead.
- The isolator (switch between the appliance
and the power supply) is turned off.
- On the control panel, the on/off switch is at
position 0.
• OFF
In this mode, the frost protection is activated.
- The isolator is set to position I.
- On the control panel, the on/off switch is at
position 0.
• ON
In this mode the appliance continuously fulfils
demand.
On the control panel:
- the on/off switch is in position I.
- The water temperature can be set using the
rotary button on the control
thermostat (7.3 "Control thermostat").
8.3 Error conditions
If the appliance has an error, heat demand will be
(temporarily) ignored. There are various types of
errors, divided into three groups:
• Gas control lockout errors
In this case the gas control's safety valve is closed,
as a result of which the pilot flame is extinguished.
Once this error has been rectified, the pilot flame
must be re-lit (9.2 "Starting the appliance").
Instruction manual ADM
Status of the
appliance
•
•
The cause of the error cannot be seen on the control
panel. For a detailed overview of error conditions,
please refer to the 'Errors (11 "Troubleshooting")'.
If you as an end user come across the appliance when
it is in an error status, you can attempt to start the
device up (9.2 "Starting the appliance").
However, if the error returns or occurs several times in
a short time, you must contact your service and
maintenance engineer.
Blocking errors
In this case the gas control's main valve is closed.
Despite a possible demand, combustion is
stopped although the pilot flame remains ignited.
These conditions disappear automatically once
the cause of the error has been eliminated. The
appliance then starts running again
spontaneously.
Lockout error from the flue gas thermostat
This error condition has much the same
characteristics as a 'Blocking error'. The difference
here is that the lockout (push button) for the flue
gas thermostat in the draught diverter is
activated (7.3 "Control thermostat"). After
removing the cause, the push button must be
pressed to re-start the appliance.
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