Trane Horizon OABE/F, Installation, Operation And Maintenance Manual

Page: 45 / 92

Installation
OAU-SVX004D-EN 45
Main Electrical Power Requirements
Note: All field-installed wiring must comply with NEC
and applicable local codes.
Condensate Drain Configuration
OAU units are selected based on dehumidification
capability. As such, condensate can form at a high rate.
Therefore, the OAU drain pan and condensate line are
sized and designed accordingly. However, an often-
overlooked element of proper condensate drainage is
proper P-Trap and drain line sizing and installation. An
incorrectly-designed and -installed P-Trap can restrict
condensate flow or cause water in the condensate drain
pan to “spit” or “geyser” which may cause condensate
overflow. Carefully install and trap the drain pan to ensure
adequate condensate removal under all conditions.
An evaporator condensate drain connection is provided
on unit.
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
Figure 57 .
Pitch drain lines connected to P-Trap 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”.
Chilled Water Connection Size and
Location

Verify that the power supply complies with the unit
nameplate specifications.

Inspect all control panel components; tighten any
loose connections.

Connect properly sized and protected power supply
wiring to a field-supplied/-installed disconnect switch
and to the main power terminal block (HTB1) in the
unit control panel.

Connect properly-sized earth ground.
Figure 57. Condensate trap installation
D = Pipe diameter; see Figure 63 through Figure 66, p. 49 for correct pipe
diameter
H = Internal static pressure (in wg) +1 in.
J = H x 0.5
L = H + J +D
Notes:
1. Pitch drain at least 1/2 in. per 10 ft 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.
Figure 58. Outdoor air chilled water cooling pipe chase-
connections
PANEL ENCLOSURE
D" NPT FEMALE
CONNECTOR
CLEANOUT PLUG
International Inc.
KCC
A
B
C
D