Drain Piping; Refrigerant Pipe - Westinghouse WHM36SZA21S Instrucciones De Uso E Instalación

Sheet metal duct work run in unconditioned spaces
must be adequately insulated and covered with a
vapor barrier. Fibrous duct work may be used if
constructed and installed in accordance with
SMACNA Construction Standard on Fibrous Glass
Ducts. Duct work must comply with National Fire
Protection Association as tested by U/L Standard181
for Class l Air Ducts. Check local codes for
requirements on duct work and insulation.
Duct system must be designed within the range of
external static pressure the unit is designed to operate
against. It is important that the system airflow be
adequate. Make sure supply and return duct work,
grills, special filters, accessories, etc, are accounted
for in total resistance.

3. Refrigerant Pipe

DANGER
Use refrigerant according to outdoor nameplate.
When carrying out the leakage check and test, do
not mix in the oxygen, the acetylene and the
flammable and the reactive gas, because these
gases may result in explosion. It is suggested to
use nitrogen to perform these tasks.
3.1 Pipe Material
(1) Select clean, and dry copper pipes.
(2) Choose dustless, non-humid, clean copper pipe.
Before installing the pipe, use nitrogen or dry air
to blow away dust and impurity on the pipe.
(3) Choose the copper pipe according to outdoor
manual.
3.2 Piping Connection
(1) The connection positions of the pipe are shown
below.
3-1/4
Connection positions of the pipe
Refer to the outdoor unit Installation Instructions for
details on pipe sizing, selection, pipe installation,
and charging information.
Evaporator coil is pressurized with Nitrogen at the
factory and shipped. Evacuate the system before
charging with refrigerant.
Install refrigerant lines so that they do not block
service access to the front of the unit.

4. Drain Piping

Do not over tighten drain
fitting. Unit must be slightly
pitched toward drain
connection.
Do not connect the drain pipes directly to sewage
pipes to avoid any odor. Ammonia in the sewage may
enter the indoor unit through the drain pipe and corrode
the heat exchanger. Do not twist or bend the drain hose
excessive force applied during twisting or bending may
cause leakage.
(Unit: in.)
The drain line should be insulated where necessary
to prevent sweating and damage due to condensate
forming on the outside surface of the pipe. Test
condensate drain pan and drain pipe after installation is
complete. Keep the cabinet horizontal (horizontal left or
horizontal right) to ensure a smooth drainage, or incline
the case 0.5° to the drainage hole, making it the lowest
1-5/8
point for draining. Pour water into drain pan, enough to
fill drain trap and line. Check to make sure drain pan is
draining completely, no leaks are found in drain pipe
fittings, and water is draining from the termination of the
1-3/8
primary drain pipe.
2-7/8
NOTES:
If unit is located in or above a living space where damage may
result from condensate overflow, a field-supplied, external
condensate pan should be installed underneath the entire unit,
and a secondary condensate line (with appropriate trap) should
be run from the unit into the pan. Any condensate in this external
condensate pan should be drained to a noticeable place. The
owner of the structure must be informed that when condensate
flows from the secondary drain or external condensate pan,
the unit requires servicing or water damage will occur. Install
traps in the condensate lines as close to the coil as possible.
7
Installation and Maintenance
Condensate drain trap
Do not operate unit without
condensate drain trap.
To approved drain
(Unit: in.)