Initial Start-Up At Low Ambient Temperatures; Charging Water; Piping Insulation; Water Piping Freezing Prevention - Daikin EBHQ006BAV3 Installation Manual

10.6. Initial start-up at low ambient temperatures

NOTICE
To ensure that the unit operates within its operating range
as soon as possible (water temperature >30°C), the load
during start-up must be reduced as much as possible.
For example you can do this by putting off fans of the fan
coil unit until the water temperature has increased to 30°C.
If no backup heater (EKMBUHBA6C3) is installed within
the unit we recommend to start-up the unit with a minimum
water temperature of 5°C.
For floor heating applications without a backup heater
installed, start-up circuit by circuit by using an (thermo-
static) bypass valve, make sure that the temperature of the
water returning to the unit is more than 20°C.

10.7. Charging water

1 Connect the water supply to a drain and fill valve (see
components of the outdoor unit" on page
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 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 (if
applicable).
4 Check that the backup heater vessel (EKMBUH) (if applicable) is
filled with water by opening the pressure relief valve. Water must
flow out of the valve.
NOTICE
■
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 1 bar to avoid air entering the circuit.
■
The unit might dispose some excessive water through
the pressure relief valve.
■
Water quality must be according EN directive
98/83 EC.
If no glycol is in the system in case of a power supply failure or pump
operating failure, drain the system.
When water is at standstill inside the system, freezing is very likely to
happen and damaging the system in the process.

Piping insulation

The complete water circuit, inclusive all piping, must be insulated to
prevent condensation during cooling operation and reduction of the
heating and cooling capacity as well as prevention of freezing of the
outside water piping during winter time. The thickness of the sealing
materials must be at least 13 mm with λ=0.039 W/mK in order to
prevent freezing on the outside water piping.
If the temperature is higher than 30°C and the humidity is higher than
RH 80%, then the thickness of the sealing materials should be at
least 20 mm in order to avoid condensation on the surface of the
sealing.
Installation manual
14

Water piping freezing prevention

Protect the water piping against water freezing during the winter
period (e.g. by using an external field supplied heater tape or glycol
solution).
11. I
This product contains fluorinated greenhouse gases covered by the
Kyoto Protocol. Do not vent gases into the atmosphere.
Refrigerant type:
GWP
(1)
12. E
"5.2. Main
6).
Refer to the installation manual of the EKCB indoor unit.
13. S
Refer to the installation manual of the EKCB indoor unit.
MPORTANT INFORMATION REGARDING THE
REFRIGERANT USED
R410A
(1)
value: 1975
GWP = global warming potential
LECTRICAL WIRING WORK
-
TART UP AND CONFIGURATION
EBHQ006+008BAV3
Unit for air to water heat pump system
4PW64602-1D – 12.2010