Harsco Industrial ENVI, Руководство для продвинутых пользователей

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ENVI
®
Control
33
1.8.5 Cascade Settings
Cascade settings are used to make the member boilers operate as needed in a cascade system and are
individually changeable parameters for each member.
Pressing at the CASCADE SETTINGS in the CASCADE MENU allows the user to access the cascade
settings. (Service code 2 is needed for access):
A list of the cascade settings is shown in the following table.
Cascade Settings
Function
Value
Units Passcode
Level
Max Supply T
(ver. 112E, BD71, 49A7)
(ver. 79F2, 8C51,1043,
9820)
Temperature limit for boiler output
(see note 1 & 4)
190
– 194
185
– 194
°F SVC 2
Lo load hys slv
When supply temperature is higher than header
setpoint less this value, a start restriction on the
member will be put in place
(see note 4)
0-36 °F SVC2
Loload mod dlt
Slave modulation starts when supply temperature is
higher than max supply temperature less this value
(see note 1 & 2)
0-54 °F SVC2
Loload wait slv
Delay time before the low load condition can be set
inactive
(see note 3 &4)
0-255 Sec SVC2
Load detct dlt
When supply temperature is above the header setpoint
plus this setting, the loload condition is set active
0-99 °F SVC2
Csc Min Ret T
Minimum return temperature setting this setting plus
the hysteresis will hold out the boiler from operation
when the return temp is below the added set point. In
a cascade system.
40
– 194
°F
SVC 2
Hyst Min Ret T Differential above Csc Min Ret T 0
– 36
°F
SVC 2
Ret T Max Pwr
Below this temp, boiler fires at maximum power and
should be set below Ret T min Pwr
104
– 194
°F
SVC 2
Ret T Min Pwr
Above this temp, boiler is allowed to modulate and in
between min and max ret T power the boiler are
modulated on a linear curve. And should be set above
Ret T Max Pwr
104
– 194
°F
SVC 2
Prepump Period
Time for prepump before boiler starts to ensure correct
return water temperature measurement
15
– 255
Sec
SVC 2
Cascade Settings
Max supply t 191°F
Loload hys slv
15°F
Loload mod dlt 9°F
Cascade Settings
Max supply t 191°F
Loload hys slv
15°F
Loload mod dlt 9°F
Cascade Settings
Max supply t 191°F
Loload hys slv
15°F
Loload mod dlt 9°F