Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 38

Preparing for installation
System version 3
wP Extension kit for cooling circuit
with mixer
wQ Outside temperature sensor
wW Heating water buffer cylinder tem-
perature sensor
wU DHW circulation extension
wI Heating circuit extension
wO Connection panel
eP Contact humidistat
eW Three-way diverter valve heating/
cooling
eE 2-way motorised ball valve
eR Frost stat
eT Circulation pump (primary cooling
circuit pump)
38
(cont.)
rP Heating circuit pump, mixer circuit
rQ Flow temperature sensor, mixer
rW Three-way mixer - mixer motor
tP Extension kit for one heating cir-
wE Solar collector
wR Collector temperature sensor
wT Diaphragm expansion vessel,
wZ Solar circuit extension
circuit
cuit with mixer
Only in conjunction with
Vitocal 242:
solar circuit