Domestic Hot Water Control: Advanced - Daikin Altherma EHVH/X16S18+26CA Installer's Reference Manual

Low temperature split

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Table Of Contents

Table of Contents

8 Configuration

Code

[A.3.1.1.6.1] [F-0B]

The shut-off valve:

0 (No)(default): is NOT influenced by

heating or cooling demand.

1 (Yes): closes when there is NO heating

or cooling demand.

INFORMATION

The setting [F‑0B] is only valid when there is a thermostat

or external room thermostat request setting (NOT in case

of leaving water temperature setting).

Cooling: Only applicable for EHBX and EHVX. The shut-off valve

closes, depending on [F-0C] when the unit is running in cooling

operation mode. Enable this setting to avoid cold leaving water

through the heat emitter and the forming of condensation (e.g. under

floor heating loops or radiators).

Code

[A.3.1.1.6.2] [F-0C]

The shut-off valve:

0 (No): is NOT influenced by changing

the space operation mode to cooling.

1 (Yes)(default): closes when the space

operation mode is cooling.

Operation range

Depending on the average outdoor temperature, the operation of the

unit in space heating or space cooling is prohibited.

Space heating OFF temp: When the averaged outdoor temperature

raises above this value, space heating is turned OFF to avoid

overheating.

Code

[A.3.3.1]

[4-02]

▪ EHBH/X04+08

14~25°C (default: 25°C)

▪ EHBH/X16 and EHVH/X16: 14~35°C

(default: 35°C)

The same setting is also used in

automatic heating/cooling changeover.

Space cooling On temp: Only applicable for EHBX and EHVX. When

the averaged outdoor temperature drops below this value, space

ooling is turned OFF.

Code

[A.3.3.2]

[F-01]

10~35°C (default: 20°C)

The same setting is also used in

automatic heating/cooling changeover.

Automatic heating/cooling changeover

Only applicable for EHBX and EHVX. The end-user sets the

desired operation mode on the user interface: Heating, Cooling or

Automatic (see also operation manual/user reference guide). When

Automatic is selected, the changing of the operation mode is based

on:

▪ Monthly allowance for heating and/or cooling: the end-user

indicates on a monthly base which operation is allowed (# [7:5]):

both heating/cooling or heating only or cooling only. If the allowed

operation mode changes to cooling only, the operation mode

changes to cooling. If the allowed operation mode changes to

heating only, the operation mode changes to heating.

▪ Averaged outdoor temperature: the operation mode will be

changed in order to always be within range determined by the

space heating OFF temperature for heating and the space cooling

On temperature for cooling. If the outdoor temperature drops, the

operation mode switches to heating and vice versa. Note that the

outdoor temperature will be time-averaged (see "8 Configuration"

on page 33).

Installer reference guide

Description

and

EHVH/X04+08:

Description

When the outdoor temperature is between the space cooling On and

the space heating OFF temperature, the operation mode remains

unchanged unless the system is configured in room thermostat

control with one leaving water temperature zone and quick heat

emitters. In that case, the operation mode will change based on:

▪ Measured indoor temperature: besides the heating and the

cooling desired room temperature, the installer sets a hysteresis

value (e.g. when in heating, this value is related to the desired

cooling temperature) and an offset value (e.g. when in heating,

this value is related to the desired heating temperature). Example:

the desired room temperature in heating is 22°C and in cooling

24°C, with a hysteresis value of 1°C and an offset of 4°C.

Changeover from heating to cooling will occur when the room

temperature raises above the maximum of the desired cooling

temperature added by the hysteresis value (thus 25°C) and the

desired heating temperature added by the offset value (thus

26°C). Oppositely, changeover from cooling to heating will occur

when the room temperature drops below the minimum of the

desired heating temperature subtracted by the hysteresis value

(thus 21°C) and the desired cooling temperature subtracted by the

offset value (thus 20°C).

▪ Guard timer to prevent too frequent changing from heating to

cooling and vice versa.

Changeover settings related to the outdoor temperature (only when

automatic is selected):

Code

[A.3.3.1]

[4-02]

Space heating OFF temp. If the outdoor

temperature raises above this value, the

operation mode will change to cooling:

▪ EHBH/X04+08

14~25°C (default: 25°C)

▪ EHBH/X16 and EHVH/X16: 14~35°C

(default: 35°C)

[A.3.3.2]

[F-01]

Space cooling On temp. If the outdoor

temperature drops below this value, the

operation mode will change to heating:

10~35°C (default: 20°C)

Changeover settings related to the indoor temperature. Only

applicable when Automatic is selected and the system is configured

in room thermostat control with 1 leaving water temperature zone

and quick heat emitters.

N/A

[4-0B]

Hysteresis: Ensures that changeover is

only done when necessary. Example: the

space operation mode only changes

from cooling to heating when the room

temperature drops below the desired

heating temperature subtracted by the

hysteresis.

1~10°C, step 0.5°C (default: 1°C)

N/A

[4-0D]

Offset: Ensures that the active desired

room temperature can be reached.

Example: if heating to cooling

changeover would occur below the

desired room temperature in heating, this

desired room temperature could never

be reached.

1~10°C, step 0.5°C (default: 1°C)

8.3.2