Baxi PBM-i 20 Manual Del Usuario página 101

INSTALLER CONNECTIONS
• Close the cover A1 and secure it with the screw A2
• Plug in the 4-pin connector, figure (7)
• Replace the terminal, starting with the lower tabs, applying
a hinge movement. Make sure that the electrical wires are
7
YV5 3-way valve for domestic hot water production
The 3-way valve installed outside of the unit deviates the
flow of hot water produced by the unit to the DhW storage
tank.
During domestic hot water production, the cooling/heating
demand is not satisfied.
Wire the three-way valve supplied as an accessory by Man-
ufacturer following the instructions shown in the figure.
The valve is also fitted with a limit switch. The limit switch con-
tact is either closed or open based on the position of the valve.
Auxiliary contact closed = Valve open
Auxiliary contact open = Valve closed
If not supplied by Manufacturer, the 3-way valve for domes-
tic hot water production should have the following character-
istics:
• Voltage 230V AC, 50/60 hz
• Opening/closing time 10s.
• Delta P 500 kPa
• Fluid temperature 0°C to 90°C
Use three-way valves with pressure drop below 20 kPa.
For further details see the chapter "Operating characteris-
tics".
Optional connection
KM2 System outlet electric heater
An electric heater installed at the outlet can be activated as
a supplementary heater for the system.
Solution 1
System with heat pump and electric heater with storage
tank.
Position probe BT9 in the storage tank.
Solution 2
System with heat pump and outlet electric heater WIThOUT
storage tank.
Position probe BT9 on the system outlet pipe.
Wall
inside to ensure correct fastening (click on).
• Dimensions of A5 room controller figure (8).
8
143
9 12 13
Brown
Black
Blue
Green
Auxiliary
White (SMP28*) - Red (SBC28*)
contact
Yellow/Green
* Valve model
If three-way valves with a travel time greater than 10 sec-
onds are used, modify the setting of parameter 0231
Description Menu Parameter
no.
Three-way valve Mn02 0231
travel time for
domestic hot water
production
1
6 9 43 44
230V / 400V
2
6 9 43 44
230V / 400V
I A
8 28
YV5
Default Value to be set UOM
12 Set the travel time sec.
for valves not
supplied by the heat
pump manufacturer
BT9
BT9
EN PBM 20÷40 21