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

Page: 39 / 92

Installation
OAU-SVX004D-EN 39
Horizon Water Source Heat Pump Field
Connection Instructions
The following instructions illustrate the field connections
for water lines on a typical Horizon™ water source heat
pump unit.
Water source heat pump units will be installed on curbs
with a pipe chase section attached (as shown in
Figure 40 ).
1. Open the doors on the water source heat pump cabinet
section to access the coils and the pipe chase panel
cover (see Figure 43 for a view of the pipe chase panel
cover located on the floor of the cabinet section
beneath the center drain pan).
2. Remove the hex head sheet metal screws from the
center drain pan (do not discard) to access the pipe
chase panel cover.
3. Remove the hex head sheet metal screws from the pipe
chase panel cover for access to the pipe chase and
discard the cover.
Note: If water lines will not be entering the cabinet
section through the pipe chase, contractor must
field-cut holes and the pipe chase panel cover
can remain in place.)
4. Cut required holes (size varies depending on unit size
and type of pipe gasket used) in the center drain pan for
pipe entry. Reinstall the center drain pan, insert pipe,
and seal as necessary to prevent water leakage around
drain pan/pipes.
5. Connect the water lines to the NPT male connections
(there is a “water in” and a “water out” connection per
unit). Refer to
Table 5, p. 40 for specific water line sizes
per cabinet and tonnage.
The “water out” line will contain a factory installed ball
valve with actuator. See
Figure 44, p. 40 for details (coil

Assemble and install the roof curb (if applicable).
Refer to the latest edition of the curb installers guide
that ships with each curb kit. Check curb for level
installation; if not level, shim as required.

Rigging unit (refer to “Unit Weight and Rigging,”
p. 33 ).

Set the unit onto the curb; check for level.

Ensure unit-to-curb seal is tight and without buckles
or cracks.

Install and connect proper condensate drain line to
the evaporator condensate pan drain connection (see
Figure 57, p. 45 ).
Figure 40. Typical water source heat pump cabinet
Figure 41. Typical water source heat pump unit curb
Figure 1
Pipe Chase
Section of Curb
Figure 42. Rear isometric view (doors hidden for clarity)
Figure 43. Pipe chase panel cover
Figure 3
Rear Isometric View (Doors Hidden
for Clarity)
Water Ͳ Source Heat Pump
Cabinet Section
Water
Ͳ
Source Heat
Pump Coil Location
Center Drain Pan
Pipe Chase Panel Cover
Fi
Pipe Chas