Lag Heat Pumps - Viessmann VITOCAL WPR 300 Service Instructions Manual

Heat pump
(cont.)
& Temperature differential for the start
of the defrost process ("Temp. diff.
defrost", 500E)

Lag heat pumps

The heat pump control unit in the lead appliance can regulate up to four lag heat
pumps, subject to connection method. Parameter "No. of ext. heat p" (5735)
indicates the number.
Parameter "Cascade control" (700A)
determines whether the lag heat
pumps are connected to each other
via external extension H1 or via LON.
The lag heat pumps are identified for
communication via LON by allocating
them a unique number ("Number of
heat pumps", 5707). For the address
within the LON, a system and subscri-
ber number is additionally allocated.
Parameter
"Cascade control", 700A
"No. of ext. heat p", 5735
"System diagram", 7000
& Evaporator temperature for the start
of the defrost process ("Defrost
start t", 500F)
& Max. evaporator temperature
("Defrost stop t", 5010).
Note
For heat pump cascades via LON, the
lead appliance must have the LON
communication module for heat pump
cascades installed.
For a heat pump cascade, the follow-
ing parameters in lead and lag heat
pumps must be set in accordance with
the following table.
Setting
Lead appliance
1 or 2
1 to 3 (H1)
1 to 4 (LON)
0 to 10
Function description
Lag heat pump
0
0
11
15