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WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury.
When it is necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been properly trained in
handling live electrical components perform these
tasks.
HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK
HTB1 OR UNIT DISCONNECT SWITCH.
• Observe the ABC and CBA phase indicator lights on
the face of the sequencer. The ABC indicator light will
glow if the phase is ABC. If the CBA indicator light
glows, open the disconnect switch or circuit protection
switch and reverse any two power wires.
• Restore main electrical power and recheck phasing. If
the phasing is correct, open the disconnect switch or
circuit protection switch and remove the phase
sequence indicator.
Voltage Supply and Voltage Imbalance
Supply Voltage
Electrical power to the unit must meet stringent
requirements for the unit to operate properly. Measure
each leg (phase-to-phase) of the power supply. Each
reading must fall within the utilization range stamped on the
unit nameplate. If any of the readings do not fall within the
proper tolerances, notify the power company to correct this
situation before operating the unit.
Voltage Imbalance
Excessive voltage imbalance between phases in a three
phase system will cause motors to overheat and eventually
fail. The maximum allowable voltage imbalance is 2%.
Measure and record the voltage between phases 1, 2, and
3 and calculate the amount of imbalance as follows:
% Voltage Imbalance = [(AV – VD)/AV] x 100 where;
AV (Average Voltage) = (Volt 1 + Volt 2 + Volt 3) / 3
Volt 1, Volt 2, Volt 3 = Line Voltage Readings
VD = Line Voltage reading that deviates the farthest from
the average voltage.
Example:
• If the voltage readings of the supply power measured
221, 230, and 227, the average volts would be: (221 +
230 + 227) / 3 = 226 Avg
• VD (reading farthest from average) = 221
• The percentage of imbalance equals: [(226–221) / 226]
x 100 = 2.2%
The 2.2% imbalance in this example exceeds the
maximum allowable imbalance of 2.0%. This much
imbalance between phases can equal as much as a 20%
current imbalance with a resulting increase in motor
winding temperatures that will decrease motor life.
If the voltage imbalance at the job site is over 2%, notify the
proper agencies to correct the voltage problem to within
2.0% before operating this equipment.
Starting the Unit
Before closing the main power disconnect switch, insure
that the “System” selection switch is in the “Off” position
and the “Fan” selection switch for Constant Volume or SZ
VAV units is in the “Auto” position.
Close the main power disconnect switch and the unit
mounted disconnect switch, if applicable.
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury.
When it is necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been properly trained in
handling live electrical components perform these
tasks.
HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK
HTB1 OR UNIT DISCONNECT SWITCH.
Upon powering the unit, the Symbio™ 700 performs self
diagnostic checks to ensure all internal controls are
functional. When the user interface is ready or the mobile
app is connected to the Symbio 700 controls, use the
following test procedure to start the unit at the control
panel. Each test step can be activated individually by
selecting the unit operating stage desired. The unit can be
left in any test step for up to one hour (adjustable to values
between 1 and 120 minutes) before Service Test will
automatically terminate. Once Service Test has been
terminated, a system reset will occur and the unit will revert
to the system control (for example, zone temperature for
Multi-speed and Single Zone VAV units or discharge air
temperature for Multi-zone VAV units).
Startup
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