Features - heat-timer Mini-MOD-CNC Installation And Operation Instructions Manual

6 Heat-Timer Corp.

features

condensIng and non-condensIng BoIlers can Be ModulatIng or MultI-stage.
The Mini-MOD-CNC can operate both modulating and staging boilers. Just specify each of the Condensing and Non-Condensing Boiler
Group type and the Mini-MOD-CNC will activate the groups based on an adjustable set of criteria.
pId type logIc
The Mini-MOD-CNC's control algorithms allow it to look at the rate of change in the system. If the system temperature is changing
quickly, the Mini-MOD-CNC will react quickly to adjust the modulating stages' output. If the system temperature changes slowly, the
Mini-MOD-CNC will make slow and gradual output adjustments. Therefore, the Mini-MOD-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 Mini-MOD-CNC will accurately control
the output from 0 to 100% of modulation for each of these different types of motors. Moreover, a single Mini-MOD-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 Mini-MOD-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 Mini-MOD-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 Mini-MOD-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 Mini-MOD-CNC has a hydronic outdoor temperature reset function. This allows the Mini-MOD-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 Mini-MOD-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 Mini-MOD-CNC will start the next boiler and so on. Moreover,
the Mini-MOD-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 Mini-MOD-CNC is designed to control four stages. However, it has the capability of expanding its control to two
extension panels (HT# 926712-00) each with six boiler stages. Thus, the Mini-MOD-CNC can control a total of up to 16 boiler stages.