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Key to the circuit diagrams
Colour codes:
bl:
blue
blk:
black
blu:
blue
br:
brown
bro:
brown
ge:
yellow
gn:
green
grn:
green
or:
orange
ora:
orange
rt:
red
sw:
black
vi:
violet
vio:
violet
yel:
yellow
Miscellaneous:
Circ.:
Circulation
Com.:
Communication
Eev:
Electronic expansion valve
EVU:
Electrical power company
HC:
Heating cycle
HW:
Hot water
INL:
Inlet
mix.
Mixed
PV:
Photovoltaic
PWM:
Phase width modulation
RCCB:
Refrigerant circuit control box
RF:
Return flow
Temp.:
Temperature
unmix.:
Unmixed
Utility:
Electrical power company
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