Benchmark ZWB 7-29 CC1 Installation And Servicing page 98

Failure identification procedure
Set room temperature exceeded by large amount
Check
1. Do radiators get too hot?
2. Bad choice of location for program-
mer, e.g. outside wall, near window,
in draught, on hollow wall, etc.
3.
Excessive fluctuations in room temperature (TA 211 E)
Check
1. Periodic effect of external heat on
room, e.g. from sunshine, lighting, TV,
separate stove, fire, etc.
2. Bad choice of location for program-
mer, e.g. outside wall, near window,
in draught, on hollow wall, etc.
Room temperature too high in Economy mode
Check
Building retains heat well
50
Action
yes: TR 2:
B Decrease setting of "Heating" control
TA 211 E:
B Correct heating characteristic.
↓2.
↓2.
no:
B Select better installation location.
yes:
-or-
B Fit external room thermostat.
↓3.
↓3.
no:
B Turn down thermostatic valve(s).
Action
B Eliminate external heat sources if possible.
yes:
↓2.
↓2.
no:
B Select better installation location.
-or-
B Fit external room thermostat.
Action
B Set economy temperature lower .
yes:
or
B Set to Frost Protection instead of Economy.
or
B Set start time for Frost protection/Economy
earlier.
7 181 465 346 GB (03.02)