Enable the next Boiler only at low Outside Air Temperatures

This is a special function release a redundant heat generator only at low outside air temperature. In redundant systems the number of boilers in the normal sequence is high enough to deliver the heat power for the whole system throughout the year. The redundant boiler should be switched on for a very low outside air temperatures.

The redundant boiler will be released only if the outside temperature falls below the parameter OAT-01 to enable the next boiler.


The redundant boiler will be locked if the outside air temperature gets higher than the parameter OAT-02. After the switch on/ off condition are fulfilled, redundant boilers will switch on with a delay defined by OVR-03 and switch off after a delay defined by OVR-04.

To disable this function set OAT-01 = -50.

Table 13.   Parameter List

Description

Value Range

Default Value

Unit

CFG-02: maximum number of redundant heat generators

0/ 1

0

-

OAT-01: low limit outside air temperature to enable the redundant boiler

-50 ... 50

-10

°C

OAT-02: high limit outside air temperature to disable the redundant boiler

-50 ... 50

0

°C

OVR-03: switch on delay overrides

0 ... 480

0

min

OVR-04: switch off delay overrides

0 ... 480

0

min