Domestic Hot Water Control - Daikin Altherma EJHA-AV3 Installation Manual

H hybrid heat pump module

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Installer's reference manual (112 pages)

Table Of Contents

Table of Contents

6 Configuration

If...

Space heating is done

And...

by...

Gas boiler only

(only applicable in case of

*HY2KOMB28+32AA gas boiler)

Combination of outdoor unit and

gas boiler

(only applicable in case of

*HY2KOMB28+32AA gas boiler)

Field setting [C-0B] defines whether ΔT control is enabled. The main

pump will only run according to ΔT control if [C-0B] is set to 1 and

space heating is done by the outdoor unit only. If the pump runs

according to ΔT control:

If Emitter type [2-0C]=...

0: Underfloor heating

1: Fancoil unit

2: Radiator

INFORMATION

Changing these settings can result in discomfort. Refer to

the installer reference guide for more information.

Leaving water temperature: Modulation

Code

[A.3.1.1.5]

[8‑05]

Leaving water temperature modulation:

▪ 0 (No): Disabled

▪ 1 (Yes): Enabled. The leaving water

temperature is calculated according

to the difference between desired

and actual room temperature. This

allows

heat pump

required capacity and results in less

start/stop cycles of the heat pump

and more economic operation.

This function is only applicable in case

of room thermostat control ([C-07]=2).

N/A

[8-06]

Leaving water temperature maximum

modulation:

Range: 0°C~10°C

Requires modulation to be enabled.

This is the value by which the desired

leaving water temperature is increased

or lowered.

INFORMATION

When leaving water temperature modulation is enabled,

the weather‑dependent curve needs to be set to a higher

position than [8-06] plus the minimum leaving water

temperature setpoint required to reach a stable condition

on the comfort setpoint for the room. To increase

efficiency, modulation can lower the leaving water setpoint.

By setting the weather‑dependent curve to a higher

position, it cannot drop below the minimum setpoint. See

the illustration below.

Installation manual

Then the main pump runs...

At maximum pump speed.

Then the target ΔT in heating

is...

Variable according to [1-0B].

Fixed (10°C).

Description

better

matching

the

capacity

actual

T t

+[8-06]

−[8-06]

Weather-dependent curve

Minimum leaving water temperature setpoint required to

reach a stable condition on the comfort setpoint for the

room.

Leaving water temperature: Emitter type

Code

Emitter type:

[A.3.1.1.7]

[9‑0B]

Reaction time of the system:

▪ 0: (Quick)

Example: Small water volume and

fan coils.

▪ 1: (Slow)

Example: Large water volume, floor

heating loops.

Depending on the system water volume

and the heat emitters type, the heat up

of a space can take longer. This setting

can compensate for a slow or a quick

heating system by adjusting the unit

capacity during the heat up cycle.

Quick heat up function

Code

N/A

[C‑0A]

Indoor quick heat up function:

▪ 0: OFF.

▪ 1: On.

Only applicable in case of room

thermostat control. The function will

start up the gas boiler when the actual

room temperature is 3°C lower than the

desired room temperature. The large

boiler capacity can quickly boost up the

room temperature to the desired

temperature. This can be useful after

long periods of absence or after a

breakdown of the system.

Leaving water temperature: Delta T source

Code

[A.3.1.3.1]

[1‑0B]

Heating: required temperature

difference between entering and

leaving water.

In case a minimum temperature

difference is required for the good

operation of the heat emitters in heating

mode.

Range: 3°C~10°C

6.2.5