Table of Contents
Advertisement
12 TEMPERATURE PROTECTION
The difference between Supply temperature and Return Temperature is continuously monitored. To large of a
difference can indicate a defective pump or a clogged heat exchanger. To protect the boiler, the burner controller
reduces the input when the temperature difference ΔT (Delta T) becomes too high:
At maximum boiler input ΔT is limited to 63 °F (35 °C) - (Hx_Diff_DeltaT_Min )
In between 63 °F (35 °C) and 77 °F (43 °C) boiler input modulates between minimum and maximum.
At minimum boiler input ΔT above 77 °F (43 °C) is allowed - (Hx_Diff_DeltaT_Min plus 14 °F (+8 °C)
Above ΔT = 86 °F (48 °C), the boiler is switched OFF during HX_Diff_Max_Wait_Time.
Relevant factory set variables
Parameter
HX Diff DeltaT Min
HX Diff Max Wait Time
Wait time after upper limit primary heat exchanger
differential has been exceeded.
120
high power
100
80
60
40
20
0
50
Figure 12.1
13 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 controls e2prom).
The boiler circulator will continue to run during most locking and blocking error codes. This is to prevent the freezing
of the Central Heating circuit when the boiler is in error during the winter period. For some non-volatile lockouts the
circulator will not be running, also see the error tables in this chapter for more details.
Boiler history
The last 15 lockouts and 15 blocking errors are stored in the boiler control. This boiler history can be shown via the
Boiler History screen via the installer boiler status menu in one of the advanced displays.
•
Successful ignitions
•
Failed Ignitions
•
Flame Failures
•
Operation days
•
CH Burner Hours
•
DHW Burner Hours
boiler input control
63
77
60
70
delta T [°F]
E93.1901EN032 Installation and Service Manual SlantFin VGH-CH / CO
Level
Factory
Setting
63 ºF (35 ºC)
Factory
Factory
180 Sec.
low power
off
86
80
90
Range
18....144 ºF (10 ....80 ºC)
1....255 Sec.
100
113
Advertisement
Table of Contents
