DeDietrich AWHP-2 MIT-IN-2 iSystem Installation And Service Manual page 131

AWHP-2 MIT-IN-2 iSystem
Control system sequence
Status
1 Demand (Heating /
Cooling / Domestic hot
water)
3 Operating in heating
mode
4 Operating in DHW mode
5 Heat pump shutdown
25/06/2014 - 7616371-001-04
Sub-status
1 Anti-hunting
2 Pending start-up conditions
3 Heat pump and back-up power cut off
active
30 Normal operation
31 Heat pump off as the temperature is too
high
32 Normal operation, Back-up stopped
owing to the bivalency point
33 Normal running with the set point
temperature equal to the minimum flow
temperature to guarantee defrosting
34 Heat pump off owing to the power cut off x
35 Back-up off owing to the power cut off
36 Heat pump off as the outside temperature
is too low
37 Heat pump off owing to a defrosting error
and a flow temperature value of less than
18°C
38 Defrosting
39 Defrosting with flow temperature less
than the minimum threshold permitted
30 Normal operation
31 Heat pump off as the temperature is too
high
34 Heat pump off owing to the power cut off
35 Back-up off owing to the power cut off
36 Heat pump off as the outside temperature
is too low
38 Defrosting
40 Heating pump on the heat pump in post-
operation
Heating Domestic hot
water
x
x x
x x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x x
8. Troubleshooting
Remarks
Only when the heat
pump or boiler
heating pump is
running owing to
post-operation
Only in heating/
cooling mode when
there is no demand
for domestic hot
water
Demand present with
back-up and heat
pump off
The heat pump or
one of the back-ups
at least is running
The heat pump or
one of the back-ups
at least is running
(Except domestic hot
water back-up)
No heating or
domestic hot water
demand
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