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Installation
Connect properly sized and protected power supply
wiring to a fieldsupplied/installed disconnect switch
and to the main power terminal block (HTB1) in the
unit control panel.
Install proper grounding wires to an earth ground.
Note: All field-installed wiring must comply with NEC
and applicable local codes.
Condensate Drain Configuration
An evaporator condensate drain connection is provided
on each unit. Refer to
Figure 2
appropriate drain location.
A condensate trap must be installed at the unit due to the
drain connection being on the "negative pressure" side of
the fan. Install the P-Trap using the guidelines in
A condensate drain line must be connected to the P-Trap.
Pitch the drain lines at least 1/2 inch for every 10 feet of
horizontal run to assure proper condensate flow. Do not
allow the horizontal run to sag causing a possible double-
trap condition which could result in condensate backup
due to "air lock".
RRU units are selected based on dehumidification
capability. As such, condensate can form at an enormous
rate. Therefore, the RRU drain pan and condensate line are
sized and designed accordingly. However, an often
overlooked element of proper condensate is trapping. An
incorrectly designed and installed trap on the piping
exiting the drain pan can restrict condensate flow or cause
condensate to "spit" or "geyser." This can dampen the air
handler interior and, or ductwork, creating an opportunity
for mold infestation. Carefully install and trap the drain
pan to ensure adequate condensate removal under all
conditions.
Figure 10. Condensate trap installation
Panel Enclosure
0.75 inch NPT Female
Connetor
Important:
For internal static pressure above 1.5 in. wg,
use the following for P-Trap dimensions:
•
H = Internal Static Pressure (in. wg) + 1 in.
24
to
Figure 7
for the
Figure
10.
H (2.5)*
L (4.5)*
J (1.25)*
Clean out Plug
•
J = H*0.5
•
L = H + J + 0.75 in.
Notes:
1. Pitch drain at least 1/2 in. per 10 in. horizontal run.
2. Condensate drain pan will not drain properly if P-Trap
is not primed and of adequate height to allow for
cabinet operating negative pressure.
Filter Installation
Each unit ships with 2-inch permanent filters installed. The
quantity of filters is determined by unit size. Access to the
filters is obtained lifting the access panel on the outdoor
air intake hood.
Note: Do not operate the unit without filters.
Field Installed Power Wiring
An overall dimensional layout for the standard field
installed wiring entrance into the unit is illustrated in
Figure 2
to
Figure
7. To insure that the unit's supply power
wiring is properly sized and installed, follow the guidelines
outlined below.
Note: All field installed wiring must conform to NEC
guidelines as well as State and Local codes.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not designed
or qualified to accept other types of conductors.
Verify that the power supply available is compatible with
the unit's nameplate ratings. The available supply power
must be within 10 percent of the rated voltage stamped on
the nameplate. Use only copper conductors to connect the
power supply to the unit.
Main Unit Power
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.
Standard Wiring
The electrical service must be protected from over current
and short circuit conditions in accordance with NEC
RRU-SVX01F-EN
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