Service Manual
6
3. ZIO-21 board
Pic.3 ZIO-21 board
LUB
LUB
white
yellow
black
brown
blue
red
blue
yellow
ZIO
power
supply
PUMP
red
blue
Tzas – DHWT water electronic temperature sensor DS-1820
WZ – DHWT thermostat
RP – jumper or room thermostat
NA - jumper or superior device
ZAS – three way valve
ZM – power module (ribbon cable)
I2C - PSK.P4 cable (ribbon cable 5 pin)
X.NA - PSK.P4 cable (ribbon cable 2 pin)
MR – radio controlled room thermostat receiver
F1
- 1 A fuse (pump protection)
F2
- 160 mA fuse or polymer fuse (ZIO protection)
JUMPER
JUMPER
OR
OR
