MHS Boilers STRATA 3 220, Instructions For Installation, Servicing & Operation

Page: 16 / 47

16
STRATA3
5.7.7 cascade controller KKM2
The KKM2 Cascade Manager is available as an accessory (see fig 5.7f ). The cascade controller can
operate up to 5 units. On a load dependant basis, it controls the modulation of the burners, and the
switching of the appliance(s). It includes all necessary sensors and an external temperature control which
adjusts the flow temperature of the cascade system as a function of the outside air temperature and/or
the sensed room temperature via the RE 2132 (if required) or 0-3 or 0-10v input. The KKM2 may also be
set to give a constant flow temperature and can also control a domestic hot water circuit.
Fig 5.7f
Other types of cascade controllers with a continuous 0 to 3V, or 0 to 10V signal can also be connected.
An optional adapter is required, for 0 to 10V. See Fig 5.7e (Below)
A1 A2
0v
Nr: 4
V+
R1 R2 R3
0 - 10v adaptor
Welland Plug
To Boiler Socket Nr: 4
Welland Connection Plug Nr: 4
0-10 volt Adaptor
0-3 volt control direct to boiler plug
Nr: 4 without adaptor.
0-10 volt control via 0-10 volt adaptor
(optional extra)
Fig 5.7e