Johnson Controls YORK YHMH 20 Notice D'instructions page 33

The choice and installation of the components is left to
the installer, who should operate in a workmanlike man-
ner in compliance with current laws and regulations.
The use of water disconnectors is compulsory on sys-
tems to which anti-freeze has been added.
Special supply/fill-up water should be treated with suit-
able systems. Reference values may be taken as those
given in the table.
Do not apply the adhesive tape too tightly in order not to
damage the insulation.
To carry out the water connections
- Hook the fan coil to the metal plate keeping the lower
edge raised.
- Position the water pipes.
- Clean the surfaces of the fittings and the ends of the water
pipes.
- Position the supplied joints on the ends of the water pipes
and on the fan coil fittings.
- Tighten the joints properly.
- Place insulating material over the joints, fixing it with adhe-
sive tape in order not to damage the insulation.
- Hook the fan coil onto the metal plate.
Key:
1 - Ring nut
2 - Open metal ring
3 - Metal ring
4 - O-ring
5 - Fitting
Connections carried out
in the factory
1
3
4 5
2
5
4
REFERENCE VALUES H2O
pH
Electric conductivity
Chlorine ions
Sulphuric acid ions
Total iron
Alkalinity M
Total hardness
Sulphur ions
Ammonium ions
Silicate ions
1
2
3
4
5
Connections carried
out by the installer
Inlet
Outlet
6-8
less than 200 mV/cm (25°C)
less than 50 ppm
less than 50 ppm
less than 0.3 ppm
less than 50 ppm
less than 35 °f
none
none
less than 30 ppm
Hook on here
4
3
2
1
1 Fan
2 Heat exchanger
3 Air valve
4 Joint (supplied)
5 Ball shutoff valve
GB
11