Voltage Supply; Electrical Data; Electrical Service Sizing - Trane IntelliPak 3 with Symbio 800 Installation, Operation And Maintenance Manual

Installation
☐ (Units with StatiTrac) Field supplied pneumatic tubing
connected to the proper fitting in the main control box,
and the other end routed to a suitable sensing location
within the controlled space.

Voltage Supply

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.
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.
Voltage Imbalance
Excessive three phase voltage imbalance between phases
will cause motors to overheat and eventually fail. The
maximum allowable voltage imbalance is 2 percent.
Measure and record the voltage between phases 1, 2, and
3 and calculate the amount of imbalance as follows:
percent Voltage Imbalance =
AV (Average Voltage) =
V1, V2, V3 = 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:
VD (reading farthest from average) = 221
The percentage of Imbalance equals:
36
where;
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 is over 2%, notify the proper agencies to
correct the voltage problem before operating this
equipment.

Electrical Data

Electrical Service Sizing

To correctly size electrical service wiring for a unit, find the
appropriate calculations listed below. Each type of unit has
its own set of calculations for MCA (Minimum Circuit
Ampacity) and MOP (Maximum Overcurrent Protection).
Read the load definitions that follow and then find the
appropriate set of calculations based on unit type.
Note: Set 1 is for cooling only and cooling with gas heat
units, and set 2 is for cooling with electric heat units.
Load Definitions: (To determine load values, see the
Electrical Service Sizing Data Tables on the following
page.)
Load Definitions
Current of the largest motor (compressor or fan motor)
LOAD 1
Sum of the currents of all remaining motors
LOAD 2
LOAD 3 Current of electric heaters
Any other load rated at 1 amp or more
LOAD 4
Set 1: Cooling Only Rooftop Units and
Cooling with Gas Heat Rooftop Units
MCA = (1.25 x LOAD1) + LOAD2 + LOAD4
MOP = (2.25 x LOAD1) + LOAD2 + LOAD4
Select a fuse rating equal to the MOP value. If the MOP
value does not equal a standard fuse size as listed in NEC
240-6, select the next lower standard fuse rating.
Note: If selected MOP is less than the MCA, then select the
lowest standard maximum fuse size which is equal
to or larger than the MCA, provided the selected
fuse size does not exceed 800 amps.
Set 2: Rooftop units with Electric Heat
Single Source Power units (460V and 575V)
To arrive at the correct MCA and MOP values for these
units, two sets of calculations must be performed. First
calculate the MCA and MOP values as if the unit was in
cooling mode (use the equations given in Set 1). Then
calculate the MCA and MOP values as if the unit were in
RT-SVX080A-EN