MPT 700
18
3.4 Mode of operation 4 - heating/cooling with variable pulse
width and spacing
•
In this mode of operation, no fixed pulse widths are defined.
•
The pulse width or the pulse spacing changes as a function of the setting.
•
Max. pulse frequency = 1 / (min. on time + min. off time)
•
The maximum pulse frequency is reached at a setting corresponding to the
value entered for parameter 28 and 29 ('XX' in diagram).
•
Even before the unit changes from pulse operation to a continuous pulse, the
minimum off time never falls below the set parameter value.
•
Setting source: heating/cooling limit and heating/cooling dead zone adjustable
(see diagram in section 4.11)
•
For burner and valve control a maximum of 8 outputs are available in 128 mode
(a maximum of 6 in 108 mode).
•
If required, a relay for external switchover between heating and cooling can be
controlled by the heating/cooling 1 and 2 outputs (mode 128) or outputs 7 and 8
(mode 108).
⇒
output inactive:
cooling
output active:
heating
