Flue Assembly Instructions; Voltage Imbalance - Trane RRU150F N Series Installation, Operation And Maintenance Manual

Indirect gas-fired dedicated outdoor air rooftop unit
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Installation
Verify that a condensate trap is installed and the
piping is properly sized and pitched.
Verify that the correct size and number of filters are in
place.
Inspect the interior of the unit for tools and debris and
install all panels in preparation for starting the unit.

Flue Assembly Instructions

WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with an appropriate
voltmeter that all capacitors have discharged.
1. Remove 8 screws that attach the Burner Access
Compartment and Door Assembly.
2. Carefully remove the Burner Access Department and
Door Assembly.
3. Remove the screws that attach the lid of the unit in the
area of the flue.
4. Install the stainless steel flue assembly to the unit
while aligning the port exhaust holes and sliding the
stainless steel backing plate up under the unit lid.
5. Assemble the stainless steel flue assembly to the unit
using 6 self-tapping screws that are provided,
3 screws per side. Please note that the holes in the
stainless steel flue assembly will not align with the pre-
existing screw holes in the unit.
6. Reinstall the Burner Access Compartment and Door
Assembly to the unit by sliding the assembly up under
the stainless steel flue assembly. Use the 8 screws that
were removed in
Step
7. Install stainless steel rectangular drain chute assembly
to right side of stainless steel flue assembly using
3 rivets that are supplied. Make sure that the funnel of
the stainless steel flue assembly is inserted into the
rectangular hole in the stainless steel drain chute
assembly.
28
1.

Voltage Imbalance

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.
Three phase 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.
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:
% Voltage Imbalance =
100 X AV - VD where;
AV
where;
AV (Average Voltage) =
Volt 1 + Volt 2 + Volt 3
3
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:
221 + 230 + 227 = 226 Avg.
3
VD (reading farthest from average) = 221
The percentage of Imbalance equals:
100 X 226 - 221 = 2.2%
226
The 2.2 percent imbalance in this example exceeds the
maximum allowable imbalance of 2.0 percent. This much
imbalance between phases can equal as much as a
20 percent current imbalance with a resulting increase in
RRU-SVX02F-EN

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