Eco-King HWB-299, Installation And Service Manual

Page: 87 / 124

E93.1801EN171 HWB installation manual 87
14 TEMPERATURE PROTECTION
The difference between Supply temperature and Inlet Temperature is continuously monitored. A too big difference
can indicate a defective pump or a clogged heat exchanger. To protect the water heater, the burner controller
reduces the input when the temperature difference
Δ
T becomes too high:
At maximum water heater input
ΔT
is limited to 32.4 °F (18 °C) - ( Hx_Diff_DeltaT_Min )
In between 32.4 °F (18 °C) and 46.8 °F(26 °C) water heater input modulates between minimum and maximum.
At
minimum water heater input ΔT
above 46.8 °F(26 °C) is allowed - ( Hx_Diff_DeltaT_Minplus 14 °F (+8 °C)
Above ΔT = 55.8 °F (31 °C),
the water heater is switched OFF during HX _ Diff_Max_Wait_Time .
Relevant factory set variables
Parameter Level
Factory Setting. Range
HX Diff DeltaT Min 3: Factory 63 ºF (35 ºC) 18….144 ºF (10 ….80 ºC)
HX Diff Max Wait Time
Wait time after upper limit primary heat exchanger differential has been exceeded.
3: Factory 180 Sec.
1….255 Sec.
15 ERROR INFORMATION.
Errors can be divided in three groups:
• Manual reset locking errors (can only be reset by the reset button).
• Blocking errors (will disappear when error is gone)
• Warnings (will disappear when the warning is gone, not stored in the BCU)
The water heater pump will continue to run during most locking and blocking error codes
. This is to prevent the
freezing of the Heating circuit when the water heater is in error during the winter period. For some non-volatile
lockouts the pump will not be running, also see the error tables in this chapter for more details.
Water heater history.
The last 15 lockouts and 15 blocking errors are stored in the water heater control. This water heater history can be
shown via the Water heater History screen via the installer water heater status menu in one of the advanced dis-
plays.
•
Successful ignitions
•
Failed Ignitions
•
Flame Failures
•
Operation days
•
CH Burner Hours
•
DHW Burner Hours
63
77
86
0
20
40
60
80
100
120
50 60 70 80 90 100
bo
ile
r i
nput
[%
]
delta T [°F]
boiler input control
high power
low power
off