Daikin EWAQ009ACV3, Operation Manual

Operation manual

5

EWAQ+EWYQ009~0 EWAQ+EWYQ009~013ACW1

Packaged air-cooled water chillers and packaged reversible air to

water heatpumps

4PW51588-1

Schedule timer operation

In schedule timer operation, the installation is controlled by the
schedule timer. The actions programmed in the schedule timer will be
executed automatically.

The schedule timer always follows the last command until a new
command is given. This means that the user can temporarily overrule
the last executed programmed command by manual operation (Refer
to 

"Manual operation" on page 4

). The schedule timer will regain

control over the installation as soon as the next programmed
command of the schedule timer occurs.

The schedule timer is enabled (

p

 icon displayed) or disabled (

p

 icon

not displayed), by pressing the 

pr

 button.

To set up the SCHEDULE TIMER refer to chapter 

"Programming and

consulting the schedule timer" on page 6

.

What can the schedule timer do?

The schedule timer allows the programming of:

1.

Heating and cooling (refer to 

"Programming cooling or heating"

on page 6

)

Switch on the desired mode at a scheduled time, in combination
with a set point (weather dependent or manually set). Five
actions per weekday can be programmed, totalling 35 actions.

2.

Quiet mode (refer to 

"Programming quiet mode" on page 7

)

Switch the mode on or off at a scheduled time. Five actions can
be programmed per mode. These actions are repeated daily.

What can the schedule timer NOT do?

The schedule timer can not change the operation mode from cooling
to heating or vice versa.

How to interpret the programmed actions

To be able to understand the behaviour of your installation when the
schedule timer is enabled, it is important to keep in mind that the
"last" programmed command overruled the "preceding" programmed
command and will remain active until the "next" programmed
command occurs.

Example: imagine the actual time is 17:30 and actions are
programmed at 13:00, 16:00 and 19:00. The "last" programmed
command (16:00) overruled the "previous" programmed command
(13:00) and will remain active until the "next" programmed command
(19:00) occurs.

So in order to know the actual setting, one should consult the last
programmed command. It is clear that the "last" programmed
command may date from the day before. Refer to 

"Consulting

programmed actions" on page 8

.

NOTE

■

Only use the 

pr

 button to enable or disable the

schedule timer. The schedule timer overrules the

y

  button. The 

y

  button only overrules the

schedule timer until the next programmed action.

■

If the auto restart function is disabled, the
schedule timer will not be activated when power
returns to the unit after a power supply failure.
Press the 

pr

 button to enable the schedule timer

again.

■

When power returns after a power supply failure,
the auto restart function reapplies the user
interface settings at the time of the power supply
failure.

It is therefore recommended to leave the auto
restart function enabled.

■

The programmed schedule is time driven. Therefore, it
is essential to set the clock and the day of the week
correctly. Refer to 

"Setting the clock" on page 3

.

■

Manually adjust the clock for summertime and
wintertime. Refer to 

"Setting the clock" on page 3

.

■

A power failure exceeding 1 hour will reset the clock
and the day of the week. The schedule timer will
continue operation, but with a disordered clock. Refer
to 

"Setting the clock" on page 3

  to adjust the clock

and the day of the week.

■

The actions programmed in the schedule timer will not
be lost after a power failure so that reprogramming the
schedule timer is not required.

NOTE

When the unit is connected to an external room
thermostat, the schedule timer for cooling and heating
is overruled by the external room thermostat.

■

The programmed actions are not stored according to
their timing but according to the time of programming.
This means that the action that was programmed first
gets action number 1, even though it is executed after
other programmed action numbers.

■

When the schedule timer switches heating or cooling

x

, the controller will also be switched off.

NOTE

During schedule timer operation, someone may have
altered the actual settings manually (in other words,
the "last" command was overruled manually). The icon

p

, indicating the schedule timer operation, may still be

displayed, giving the impression that the "last"
command settings are still active. The "next"
programmed command will overrule the altered
settings and return to the original program.