Important: Optional sensors are available
from Powrmatic Ltd. Alternative types must
not be used.
It can also be used in conjunction with an additional
remote sensor which will give an average of the two
temperature readings.
Options are:
• Default internal sensor only
• Remote sensor only
• Internal sensor plus remote sensor
• Remote sensor plus remote sensor
The remote sensor should be sited no further than 100m
from the main unit. Siting of the sensor is important in that
it must be tted where the temperature will be generally
representative of the area to be heated.
It should be installed 1.7m above oor level and away
from draughty areas or areas subjected to direct heat from
sunlight, radiators etc.
The second 'sensor' input can also accept a volt free switch
input i.e. a volt free switch is connected across Terminals
Com & In2 to facilitate a remote on (BMS) or remote o.
Heating will be overridden by the switch operation during
programmed heating times. Heating control returns to
normal when the switch reverts, or when the programmed
control period ends.
The switched control does not occur while heating is
turned on due to manual override in non-programmed
times, and does not occur during the manually-selected
extension time at the end of a programmed control period.
If heating has been manually overridden to be o during a
programmed heating period, the switched control cannot
bring on the heating.
The ‘Heat on’ option means that heat will be turned fully
on by the switch. For high-low burners, the high and low
relays will be on, and for modulating burners, the control
output will be 10v.
Cost logging operates as usual. During these switch control
periods the burn time is recorded at the maximum rate.
If the sensor goes open-circuit (if either of the sensors goes
open-circuit where two are tted), the Fault LED will ash.
The LCD display will show “sensor failed”.
Important: The earlier MC100 sensor cannot
be used with the MC200/V3 and the MC200/
V3 sensor cannot be used with the MC100.
any timer is requiring Heat On, and the heating will turn
o only when all timers have reached Heat O. The
requested temperature will be set by the most recent timer
to switch On. When an overlapping timer switches O,
the requested temperature will be set by the remaining
timer(s).
• No timer can be programmed to run past midnight,
because it is assigned to a day of the week. If timed
heating is required across midnight, it must be provided
by two timers, one ending at 23:59 and the other starting
at 00:00. At midnight, all manual over-rides and extensions
are cleared.
1.1.4 Optimum Start
A control system which starts plant operation at the latest
possible time such that internal conditions will be up to
required limits at the start of the occupancy period.
• The MC200/V3 achieves Optimum start by keeping
a moving record of how many minutes it takes to
increase the temperature per degree in each 3° band
of temperature from 5°C to 20°C. The current overnight
temperature is referenced and the MC200/V3 can estimate
how many minutes are required to bring the temperature
to the required level.
When Optimum Start is enabled the switch-on time for
the heater is then advanced accordingly to achieve the
required temperature by the Heat On time i.e. the warmer
the night time temperature the closer the switch on time
will be to the Heat On time.
NOTE: If optimum start is selected, no program
time should be selected to start before 2:00am.
1.1.5 Optimim Stop
A control system which stops plant operation at the earliest
possible time such that internal conditions will not deteriorate
beyond preset limits by the end of the occupancy period.
• The MC200/V3 keeps a note of how many minutes are
taken for the temperature to drop the number of degrees
entered against this parameter when the heating period
ends. When Optimum Stop is enabled, the MC200/V3
switches o the heating that number of minutes early.
1.1.6 Temperature Sensors
The MC200 has an in-built temperature sensor by default.
This can me removed and replaced with a remote sensor if
the controller is outside the area to be heated.
The remote sensor may be either a room (warm air), black
bulb (for radiant) or duct type.
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