Differential Temperature Controller; Fault Finding Errors - Ferroli AquaSol Installation & User Manual

10. Differential Temperature Controller

Optimum performance of the solar system is assured by the DT3 controller. The unit
is fully automatic and will start the solar circulating pump when the solar collector is
10°C hotter than the lower part of the AquaSol cylinder.
Indication pump on
Pump to low power
When the temperature difference falls to 2°C the pump will switch off.
starting, the pump will automatically run on high speed (power consumption 80
watts) for a period of 400 seconds, following which it will switch to solar radiation
dependent lower speed.
The pump will be switched off as the AquaSol reaches a temperature of 85°C. After
this the collector circuit will drain and prevent the AquaSol from overheating.

10.1 Fault finding errors

In the event of a malfunction, flashing error codes will be displayed.
Codes 71 – 73 inclusive are low priority
Codes 74 – 77 inclusive are high priority
Error codes are automatically reset once the mains supply is isolated.
M 1261-06-X AquaSol Ferroli Installation Manual.doc
Start
Tcoll-Tstorage
N
Tcoll-storage>10C
Y
N
Tstorage<85
Y
N
Is the pump on?
Y
N
Tcoll-Tstorage>2C
Y
Pump on. 400s high power
July 2006
Indication pump off
Pump off
Upon
Page 21 of 24