Hydraulic Connecting; Connecting To The Heating Circuit; Rinsing Out The Installation; Connecting - Fujitsu WATERSTAGE WOYG112LHT Maintenance Document

Air to Water Heat Pump (Split integrated DHW type)

4 Hydraulic connecting

" General
The connection must comply with good trade practice
according to local building regulations.
Reminder: Seal everything when fitting in accordance
with prevailing trade practice for plumbing work:
- Use suitable seals (fibre seals, o-rings).
- Use Teflon tape or hemp.
- Use sealing paste (synthetic depending on the case).
Use glycol if the flow temperature set [908-909
Settings] <10 ° C. If you are using a glycol/water mix,
provide for an annual check on the quantity of glycol.
Use monopropylene glycol only. The recommended
concentration is 30%
monoethylene glycol .
" In certain installations, the presence of different
metals can cause corrosion problems; the
formation of metal particles and sludge in the
hydraulic circuit is then seen .
" In this case, it is advisable to use a corrosion
inhibitor in the proportions indicated by its
manufacturer .
- Please refer to the chapter "Treatment of domestic
and heating water" in our price catalogue.
" It is also necessary to ensure that the treated
water does not become aggressive.
- 24 -
minimum. Never use
4 .1

Connecting to the Heating circuit

4 .1 .1 Rinsing out the installation

Before connecting the hydraulic unit to the installation,
rinse out the heating system correctly to eliminate
any particles that may affect the appliance's correct
operation.
Do not use solvents or aromatic hydrocarbons (petrol,
paraffin, etc.).
In the case of an old installation, provide a sufficiently
large decanting pot with a drain on the return from the
boiler and at the lowest point in the system in order to
collect and remove the impurities.
Add an alkaline product to the water and a dispersant.
Rinse the installation several times before filling it
definitively.

4 .1 .2 Connecting

The heating circulating pump is built into the hydraulic unit.
Connect the central heating pipes to the appliance,
complying with the direction of circulation.
The pipe between the heat pump and the heat collector
must be at least one inch in diameter (26x34 mm).
Calculate the diameter of the pipes according to the
flow rates and the lengths of the hydraulic systems.
Tightening torque: 15 to 35 Nm.
Use union connectors to facilitate removing the hydraulic
unit.
Preferentially use connection hoses to avoid transmitting
noise and vibrations to the building.
Connect the drains from the drain valve and the safety
valve to the main sewer system.
Verify the correct functioning of the expansion system.
Control the vessel pressure (precharge 1 bar) and the
safety valve setting.
The flow of the installation must be at least equal to
the minimum value noted in the characteristics table
(section 1.3, page 5). Do not instal any regulating
appliance (without those present in our configurations)
who's reduce or stop the flow through the hydraulic unit.
Installation and operating manual "1768 - EN"