Start-Up Procedure; General; EnergyRecoveryVentilator(Optional) - Modine Manufacturing Sentinel UVV Installation And Service Manual

START-UP PROCEDURE

START-UP PROCEDURE
IMPORTANT
Start-up and adjustment procedures should be performed by
aqualifiedserviceagency.
The unit has been factory tested and set for proper operation,
but a full unit start-up is recommended.
See start-up sheet examples - Figures 6.1 and 7.1.
Pre-Start Checks
1. Check that the supply voltage matches the unit supply voltage
listed on the Unit Serial Plate. Verify that all wiring is secure
and properly protected. Trace circuits to insure that the unit
has been wired according to the wiring diagram.
2. Check that the unit has no visible damage and that all the
components are secure.
3. C heckthatallfieldelectricalandmechanicalworkhasbeen
performed according to all applicable Federal, State, and
Local codes.
4. Check the supply voltage to the unit is within +/- 5% of the
voltage on the unit serial plate.
Unit Start-Up Procedure
1. Turn the disconnect switch to the "ON" position.
2. Follow the instructions in the Modine microprocessor book.
The control parameters and setpoints have all been factory
set to the default values.
3. During the unit operation, measure and record all the
information that is required to complete the Start-Up Sheets
that are supplied with the unit. Copy the information onto the
Start-Up Sheets, Figures 6.1 and 7.1, in this manual for your
records.
Sequence of Operation
Microprocessor: A Carel microprocessor will control the
unit and allow for networking and remote monitoring. The
microprocessor will monitor the room temperature (either via
anoptionalwallthermostatorreturnairsensor),supplyairand
outdoor air. With this information the unit is able to operate at
maximumefficiency.Theoccupied/unoccupiedcontrolcanbe
via optional time clock or from a signal from a building central
time clock.
If a wall or unit mounted thermostat is selected, the setpoint can
be either fully adjustable or +/- three degrees. This allows some
control of the room temperature while limiting its adjustment.
The thermostat will also have an occupied override button to
allow a temporary override until the next scheduled occupancy
change.
Fan: The fan will run continuously during occupied mode
and will be intermittent on a call for cooling or heating during
unoccupied mode. A built in fan purge time allows for maximum
heatingandcoolingefficiency.
Cool: When the temperature increases above the cooling
setpoint, the cooling valve will modulate open and fan will be
energized.
Hot Water/Steam Heat: When the temperature decreases
below the heating setpoint, the heating valve will modulate open
and fan will be energized.
Electric Heat: When the temperature decreases below the
heatingsetpoint,thefirststageofelectricheatwillbeenergized.
Iftwostagesofelectricheatarefitted,thesecondstagewill
onlybeenabledifthefirststageofheatisnotkeepingupwith
heating demand.
Economizer Damper (Digit 9 = A, B or C): The economizer
damper controls the mixture of return air and outside air drawn
through the unit. During occupied mode the damper will open
to a minimum position to provide ventilation requirements to
the space. The damper shall be fully closed during unoccupied
mode.
The damper is controlled by an actuator requiring a 2.5-7.5VDC
proportional signal. At 2.5V, the damper is positioned for full
return air and no outside air. At 7.5V, the damper is positioned
for full outside air and no return air.
Economizer Damper (Digit 9 = E): The economizer damper
controls the mixture of return air and outside air drawn through
the unit. During occupied mode the damper will open to a
minimum position to provide ventilation requirements to the
space. The damper shall be fully closed during unoccupied
mode. The economizer damper and motorized exhaust damper
aretiedtothesamesignalforairflowbalancing.
The damper is controlled by an actuator requiring a 2-10VDC
proportional signal. At 2V, the damper is positioned fully closed
to outside air. At 10V, the damper is positioned fully open to
outside air.
Energy Recovery Ventilator (Optional): During operation
whentheunitiscoolingtheroom(summer),coolroomreturnair
is drawn across the enthalpy wheel. This air is then exhausted
external to the room. Warm, humid ambient air is drawn across
the other side of the ERV and as the enthalpy wheel turns, the
airiscooledanddehumidified.Thisairisthenmixedwiththe
room air and recirculated through the indoor section.
Duringoperationwhentheunitisheatingtheroom(winter)the
warm, moist air from the room is used to temper the cold, dry
external ambient air.
AIR 3-500.3
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