36
2.11.2 SEQUENCE OF OPERATION
The PCB’s paramter should be set correctly for recirculation and mode.
The Rinnai water heater should be turned on.
Pump recirculation begins when the water heater is turned on.
The Rinnai inlet and outlet thermistors measure the water temperature.
The water heater produces hot water at the temperature setting.
If the inlet thermistor detects abnormal temperature then diagnostic code 51 is generated and the pump will turn off.
When the return water temperature reaches approximately 3°C below the temperature setting, the water heater and
pump will turn off.
The cycle will restart at the approximate time interval in the table based on the temperature thermistor readings.
Economy Mode
The Economy mode operates as follows:
•
Less energy consumed due to fewer pump cycles
•
Assumes plumbing is insulated (minimal pipe heat loss)
•
Pump cycles on every 18 to 62 minutes (see table).
Comfort Mode
The Comfort mode operates as follows:
•
Higher energy consumption due to more pump cycles
•
Assumes plumbing is not insulated resulting in higher pipe
heat loss
•
Pump cycles on every 9 to 31 minutes (see table).
* The pump will cycle on at these calculated intervals which are based on the temperature setting, insulation, and
estimated heat loss in the system. The values for your installation may vary.
Temperature
setting
°C
Typical pump ON intervals *
(minutes)
Economy
Comfort
37
62
31
38
56
28
39
52
26
40
48
24
41
44
22
42
40
20
43
38
19
44
36
18
45
34
17
46
32
16
48
30
15
50
28
14
55
22
11
60
18
9
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