LAARS M4-Ext - Installation Manual - Manual (Page 6)

6
FEATURES
CONdENSiNg ANd NON-CONdENSiNg BOiLERS CAN BE MOdULATiNg OR MULTi-STAgE.
The M4-CNC can operate both modulating and staging boilers. Just specify each of the Condensing and Non-Condensing Boiler Group
type and the M4-CNC will activate the groups based on an adjustable set of criteria.
Pid TYPE LOgiC
The M4-CNC's control algorithms allow it to look at the rate of change in the system. If the system temperature is changing quickly,
the M4-CNC will react quickly to adjust the modulating stages’ output. If the system temperature changes slowly, the M4-CNC will
make slow and gradual output adjustments. Therefore, the M4-CNC adapts to specific system requirements and minimizes fluctuations
around the set point.
CONTROLS 0-5 v, 0-10 v, 1-5v, 2-10v, OR 4-20MA MOdULATiNg BURNERS
Whenever any of the Condensing or Non-Condensing Boiler Group type is set to Modulating, the M4-CNC will accurately control the
output from 0 to 100% of modulation for each of these different types of motors. Moreover, a single M4-CNC can control multiple
modulating burners each with a different modulating signal.
CONTROLS ON/OFF, 2-STAgE, 3-STAgE, OR 4-STAgE BURNERS
Whenever one of the Condensing or Non-Condensing Boiler Group Type is set to Staging, the M4-CNC will accurately sequence the
stages using a PID logic. The sequencing group will have a set of adjustable parameters to help achieve better operation.
digiTAL diSPLAY OF ALL SYSTEM SETTiNgS
The M4-CNC’s alphanumeric digital display names each system parameter in simple English and shows its precise value. The easy
to follow menu system allows users to quickly make changes to any system setting without having to learn any specialized codes or
keyboard commands.
AUTOMATiC ROTATiON AMONg STAgES
Rotating the lead stage of each group promotes even wear. The M4-CNC has three modes of rotation: Manual, Last On, or Time. The
Time rotates the lead stage every selected time period from every hour to every 60 days.
OUTdOOR RESET
The M4-CNC has a hydronic outdoor temperature reset function. This allows the M4-CNC to change the set point based on outdoor
temperature. Furthermore, additional settings have been added to fine tune this operation, like Offset, Minimum, and Maximum Water
Temperature and night setback schedule.
SYSTEM OUTPUT
This output can be used to activate a system pump, combustion air damper, or perform any other function that is required when any stage
is active. It will energize whenever the outdoor temperature is below the Outdoor Cutoff setting. A System Prove input checks the status
of components activated by the System output before stages can be activated.
NORMAL OR PARALLEL MOdULATiON
The M4-CNC can stage modulating boilers as needed. In Normal Modulation, it will allow the modulation to increase on the lead boiler
until it reaches its modulation start point adjustment. Then, the M4-CNC will start the next boiler and so on. Moreover, the M4-CNC
allows for a parallel mode that can modulate several boilers together as a one large boiler. This mode is useful when used with condensing
boilers as they run more efficient at lower modulation. Thus, it is better to run several boilers at lower modulation than to run a single
boiler at full fire.
Add UP TO 16 BOiLER STAgES (OPTiONAL)
As a stand-alone, the M4-CNC is designed to control four stages. However, it has the capability of expanding its control to two extension
panels (CA004400) each with six boiler stages. Thus, the M4-CNC can control a total of up to 16 boiler stages.
LAARS Heating Systems
HT# 059104-00 B