Features
The Comfort-Miser HVAC
Control System is an all electronic
control system that can control the
entire operation of a single or dual zone
air handler with multiple stages of Air
Conditioning, Booster Heat, Heat Reclaim,
and Fan Blower, when available. The
Comfort-Miser can control an air damper,
auxiliary heater, and the anti-sweat
heaters in refrigerated display cases. It
can also monitor the outside air
temperature and humidity.
The
ComfortMiser HVAC Control System is
available in two models:
- ComfortMiser Single HVAC Zone
Control System
- The ComfortMiser Dual HVAC Zone
Control System
The ComfortMiser HVAC Controller can
control air handler systems with the
following maximum configurations:
- Fan Blowers -- Single and Two
Stage Fan Blowers
- AC Stages -- Up to 6 AC
Stages--Staged either
sequentially or round-robin.
- Heat Reclaim -- Up to 4 HR Stages
sequentially.
- Booster Heat -- Up to 6 stages of
Booster Heat (electric or gas
fired).
- Economizer Damper -- One
two-position damper.
- Auxiliary Heater -- One circuit.
- Anti-Sweat Heater -- One circuit.
- Alarm Relay -- One circuit.
For each air handler, a maximum of
16 relay outputs can be used in any
condition.
Hardware -- The
ComfortMiser operational programming is
Flash EPROM or OTP EPROM stored. All
logged data is stored within battery-backed memory with a minimum of
a 5 year
retention. Changes to setup and operating
parameters can be made via a RS485/RS232
communications link or by the front panel
keypad and display. The current run
status of the HVAC zones is displayed on
the front panel display and on a LED
Status Panel. All connections for inputs,
communications, power, and outputs
utilize either deplugable Phoenix
CombiCon wire terminals.
Temperature Control -- The
primary function of the Comfort-Miser is
to maintain the temperature in each of
its assigned areas. The Comfort-Miser can
control up to six AC stages, four Heat
Reclaim stages, and six Booster Heat
stages. The Comfort-Miser operates in a
Cooling Mode and a Heating Mode and will
automatically switch from one mode to
another. Each stage will be activated
based upon a 0.4 °F offset above the
cooling setpoint or below the heating
setpoint. Each stage can be set for a
minimum run-time, and a user settable Cut
In/Cut Out Span is available for each
stage.
Heating Mode/Cooling Mode
-- The ComfortMiser
operates in two separate modes, Heating
Mode and Cooling Mode. A Cooling Mode
Setpoint and a Heating Mode Setpoint is
programmed into the control. The
temperature must exceed the setpoint of
the non-active mode for over 30 minutes
before the system will switch modes. For
example, the ComfortMiser is operating in
the Cooling Mode. The temperature drops
below the Heating Mode setpoint. The
temperature must remain below the Heating
Mode setpoint for over 30 minutes before
the ComfortMiser will switch to the
Heating Mode and begin activating heat
stages.
AC and Heat Staging -- Each
stage has a common Cut in and Cut Out
Temperature Setpoint and a Minimum
Runtime Setpoint. ComfortMiser has an
adjustable temperature deadband between
the Cooling and Heating Modes and a 30
minute changeover time delay. Every stage
is offset from each other by 0.4 °F.
De-Humidification -- The ComfortMiser utilizes Air
Conditioning to remove moisture from the
air. The ComfortMiser operates the
De-humidification process in both the
heating and cooling mode.
Setback Temperature
Schedule and Differential Setpoint -- During
certain regularly scheduled times, the
controller can be programmed to run in
the Setback Mode. When in the Setback
Mode, the Cooling Mode Temperature
Setpoint will be raised and the Heating
Mode Temperature Setpoint will be lowered
by the Setback Differential value. Three
Setback Schedules can be programmed:
Night Setback, Holiday Setback and an
Extra Setback. Each schedule can be
programmed for an On-time and an
Off-time. The Holiday Setback schedule
allows for 10 programmed holiday dates. The ComfortMiser gives the user
the option of locking out Booster Heat
while in Setback; this will delay the
activation of the Booster Heat after the
end of the Setback period.
Load Shedding -- During
periods of peak energy demand, the
ComfortMiser can be placed into a Load
Shedding Mode. Each ComfortMiser zone has
a digital input assigned as the control's
Load Shedding Input. When this input
reads a CLOSED signal from an energy
management system, the control will enter
the Load Shedding Mode. The control will
raise the Cooling Mode Temperature
Setpoint by the Load Shedding
Differential value and will lower the
Heating Mode Temperature Setpoint by the
same differential value.
Economizer Air Damper -- (Available
when the Outdoor Temperature and Humidity
Sensor is enabled) In Cooling Mode, a two
position air damper can be activated to
open 100% when the outside air
temperature is below 65 °F and the
outside RH is less than 45%. The
Economizer Air Damper can be forced into
the open mode by energizing the Air
Damper relay.
Booster Heat Lockout -- (Available
when the Outdoor Temperature and Humidity
Sensor is enabled) Each Booster Heat
stage has a programmable lockout
temperature setpoint. The Booster Heat
will not be activated when the outdoor
temperature is above this setpoint.
Lockout can be forced into override by a
user.
System Status Indication
Panel -- Each ComfortMiser
zone has a LED Status board on the front
panel of the control housing. This panel
will indicate the run status of each
stage, the Fan status, Setback, Alarm
status, and Dehumidification.
Auxiliary Heaters -- (Only
when the Outdoor Temperature and Humidity
Sensor is enabled) Auxiliary Heating is
used to turn on/off a heating source
according to the outside temperature,
such as a vestibule air curtain or a
sidewalk heater. The Auxiliary Heat
Control has a programmable ON setpoint
and a programmable ON Time of Day
Schedule. The Auxiliary Heater will be
activated when the outside temperature is
below the ON Setpoint and the clock is
within the range of the ON Time of Day
Schedule. The schedule allows the
Auxiliary Heater to be shut off during
non-business hours.
Anti-Sweat Heater -- The
ComfortMiser can activate the Anti-Sweat
heaters mounted in the refrigerated
display cases within their assigned HVAC
zone. Anti-Sweat heaters are designed to
prevent condensation from gathering on
the glass doors and case frames by
heating these surfaces to a temperature
above the dew point. These heaters
normally are large sources of electricity
consumption. The heater circuits can be
activated based upon a programmed
schedule, an indoor humidity setpoint or
both.
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