Daikin HXY080A8V1BF, Installation And Operation Manual

Page: 9 / 48

125A8V1BF
VRV IV System indoor unit
4P405267-1C – 2021.04
Installation and operation manual
7
Under floor heating or heat pump convectors – External room
thermostat
Setup
A Main leaving water temperature zone
B One single room
C One single room
a Outdoor VRV IV heat pump
b VRV Direct Expansion (DX) Indoor unit cassette
c HXY(080/125)
d External room thermostat
e Refrigerant piping
f Water piping
g Floor heating loop
h Fan coil unit
i Bypass valve (field supply)

The under floor heating or heat pump convectors are directly
connected to the indoor unit.

The room temperature is controlled by the external room
thermostat (demand PCB is needed for this option).
5.3. Using an auxiliary heat source
a Outdoor VRV IV heat pump
b Floor heating loop (field supply)
c Collector (field supply)
d Auxiliary heat source (field supply)
e Shut-off valve
f Aquastat valve (field supply)
g Bypass valve (field supply)

Make sure the return water to the heat pump does NOT exceed
45°C. To do so:

Set the desired water temperature via the auxiliary boiler
controller to maximum 45°C.

Install an aquastat valve in the return water flow of the
heat pump.

Set the aquastat valve to close above 45°C and to open
below 45°C.

Install non-return valves.

Make sure to only have one expansion vessel in the water
circuit. An expansion vessel is already premounted in the indoor
unit.
Alternative option EKBUH can be considered. The heater kit option
will provide additional capacity in case of heat pump capacity
shortage. See "9. Installing the optional EKBUHAA(6V3/6W1) heater
kit" on page 26 for details.
6. Preparation
6.1. Preparing installation site
Do NOT install the unit in places often used as work place. In case of
construction works (e.g. grinding works) where a lot of dust is
created, the unit must be covered.
Choose the installation location with sufficient place for carrying the
unit in and out of the site.
6.1.1. Installation site requirements of the indoor unit
Select an installation site that meets the following requirements:

All piping lengths and distances have been taken into
consideration (for requirements of piping length for the
refrigerant piping, refer to the outdoor unit installation manual):

Mind the measurement guidelines:
NOTICE

Make sure the auxiliary boiler and its integration in the
system complies with applicable legislation.

Daikin is NOT responsible for incorrect or unsafe
situations in the auxiliary boiler system.
C
B
A
d
B
A
d
b
e
c
f f
i i
a
g h
g
a
c
b d
e
f
e
WARNING
Be sure to provide for adequate measures in order to
prevent that the unit is used as a shelter by small animals
Small animals making contact with electrical parts can
cause malfunctions, smoke or fire. Please instruct the
customer to keep the area around the unit clean and clear.
Requirement Value
Maximum refrigerant piping length between indoor
unit and outdoor unit.
<135 m
(a)
(a) Refer to VRV IV piping lenght restrictions to judge the complete VRV system
integration.
Maximum height difference between indoor unit and
outdoor unit.
<15 m
(a)
NOTICE
Mind the following spacing installation guidelines.