Installation
OAU-SVX02F-EN
25
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 the 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
.
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”.
Hot Water Control Valve Wiring
1. Mount the factory-provided water valve on the return
line of the hot water coil.
2. Ensure the valve is set to normally open.
3. Run the 16 gauge black wire from TNS 2 to Input 1 of
the actuator.
4. Run the 16 gauge red wire from TNS 2 to Input 2 of the
actuator.
5. Run the 16 gauge yellow wire from AO1 from the
UC600 to Input 3 of the actuator.
Note:
The actuator valve will be open with a 0 percent
call for heat.
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 24.
Condensate trap installation
D = Pipe diameter; see 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 25.
Hot water control valve wiring
PANEL ENCLOSURE
D" NPT FEMALE
CONNECTOR
CLEANOUT PLUG
