Operation - DeDietrich MCR 24 Technical Instructions

MCR boilers are equipped with a control panel with electronic
regulation including security and flame surveillance by ionisation
probe.
The boiler is not sensitive to phase reversal. The normal maximum
absorbed power is between 115 W and 130 W. The boiler is entirely
pre-wired. All external connections can be made with terminal block
X9.
Boiler MCR power can be regulated in several ways:
Dry contact room thermostat (Commutation without power): The
boilers internal control will modulate the output to achieve the flow
temperature set point of the boiler. The contact is on the X9 terminal
strip (low voltage only).
All connections on terminal block X1,X2,X4,X5,X6,X7 are in
230 V.
All connections on terminal block X9 are low voltage only.
The MCR is a modular boiler whose temperature can be regulated
using one of the following solutions:
- Regulation as a function of room temperature:
- Easymatic,Easyradio communicating room regulation + Interface
PCB (AD 221)
- Regulation: Outside sensor alone
- Regulation as a function of the outside temperature + Outside
sensor alone:
- Easymatic,Easyradio + Outside sensor + Interface PCB (AD 221)
- Regulation as a function of the outside temperature with a 3-
channel valve circuit:
- Easymatic or Easyradio + Outside sensor + Interface PCB (AD
222)
The MCR boiler is fitted with an electronic temperature regulator with
outlet and return temperature sensors. The outlet temperature can be
set between 20 and 85. The boiler increases or lowers power as a
function of instructions.
08/06/06 - 300008460-001-B

Operation

MCR 24, 24/28 MI, 30/35 MI, 34/39 MI
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