Charging Water; Piping Insulation - Daikin EKHBX030BA Installation Manual

Example 2
The unit is installed at the highest point in the water circuit. The total
water volume in the water circuit is 92.5 gallons (350 l).
Result:
Since 92.5 gallons (350 l) is higher than 74.0 gallons (280 l), the
pre-pressure must be decreased (see table above).
The required pre-pressure is:
Pg = (H /32+0.3)x14.5 psi = (0/32+0.3)x14.5 psi = 4.4 psi
(psi) (ft)
Pg = (H /10+0.3) bar = (0/10+0.3) bar = 0.3 bar
(bar) (m)
The corresponding maximum water volume can be read from
the graph: approximately 108.0 gallons (410 l).
Since the total water volume (92.5 gallons (350 l)) is below the
maximum water volume (108.0 gallons (410 l)), the expansion
vessel suffices for the installation.
Setting the pre-pressure of the expansion vessel
When it is required to change the default pre-pressure of the
expansion vessel (14.5 psi (1 bar)), keep in mind the following
guidelines:
Use only dry nitrogen to set the expansion vessel pre-pressure.
Inappropriate setting of the expansion vessel pre-pressure will
lead to malfunction of the system. Therefore, the pre-pressure
should only be adjusted by a licensed installer.
Connecting the water circuit
Water connections must be made in accordance with local laws and
regulations and the outlook diagram delivered with the unit,
respecting the water in- and outlet.
NOTE Be careful not to deform the unit piping by using
excessive force
Deformation of the piping can cause the unit to
malfunction.
If air, moisture or dust gets in the water circuit, problems may occur.
Therefore, always take into account the following when connecting
the water circuit:
Use clean pipes only.
Hold the pipe end downwards when removing burrs.
Cover the pipe end when inserting it through a wall so that no
dust and dirt enter.
Use a good thread sealant for the sealing of the connections.
The sealing must be able to withstand the pressures and
temperatures of the system.
When using non-brass metallic piping, make sure to insulate
both materials from each other to prevent galvanic corrosion.
Because brass is a soft material, use appropriate tooling for
connecting the water circuit. Inappropriate tooling will cause
damage to the pipes.
NOTE The unit is only to be used in a closed water
system. Application in an open water circuit can
lead to excessive corrosion of the water piping.
Never use Zn-coated parts in the water circuit.
Excessive corrosion of these parts may occur as
copper piping is used in the unit's internal water
circuit.
When using a 3-way valve in the water circuit.
It is very important to guarantee full separation
between domestic hot water and floor heating
water circuit.
When using a 3-way valve or a 2-way valve in the
water circuit, the maximum change over time of
the valve shall be less than 60 seconds.
Installation manual
16
when connecting the piping.

Charging water

1 Connect the water supply to a drain and fill valve (see "Main
components" on page 10).
2 Make sure the automatic air purge valve is open (at least 2
turns).
3 Fill with water until the manometer indicates a pressure of
approximately 29 psi (2.0 bar). Remove air in the circuit as much
as possible using the air purge valves. Air present in the water
circuit might cause malfunctioning of the backup heater.
4 Check that the backup heater vessel is filled with water by
opening the pressure relief valve. Water must flow out of the
valve.
NOTE During filling, it might not be possible to remove all
air in the system. Remaining air will be removed
through the automatic air purge valves during first
operating hours of the system. Additional filling
with water afterwards might be required.
The water pressure indicated on the manometer
will vary depending on the water temperature
(higher pressure at higher water temperature).
However, at all times water pressure should
remain above 4.3 psi (0.3 bar) to avoid air
entering the circuit.
The unit might dispose some excessive water
through the pressure relief valve.
Water quality must be according to "Safe Drinking
water Act (42 U.S.C. 300f)".

Piping insulation

The complete water circuit, inclusive all piping, must be insulated to
prevent condensation during cooling operation and reduction of the
cooling and heating capacity.
If the temperature is higher than 86°F (30°C) and the humidity is
higher than RH 80%, then the thickness of the sealing materials
should be at least 0.79 inch (20 mm) in order to avoid condensation
on the surface of the sealing.
Indoor unit for air to water heat pump system
EKHBH/X030BA
4PW62568-1 – 07.2010