Trane LWHA Installation Operation & Maintenance page 9

Coil Connections
The water coils for LWHA units are of a
1-Row(Heating), 4-Row
Row(Cooling) design with high
efficiency Wavy 3BS aluminum fins and
3/8"(9.5mm) OD Copper tubes.
Proper installation and
necessary to insure satisfactory coil
operation and prevent operational
damage. Water Inlet and Outlet
connections protrude
coil section side panel. Follow the
industry standard practices when
piping the coil.
Note the following:
1. Support all piping independently of
the coils.
2. Provide swing joints or flexible
fittings in all connections that are
adjacent heating coils in order to
absorb thermal expansion and
contraction strains.
3. When attaching piping to the coil
header, make the connection only
tight enough to prevent leaks, the
maximum recommended torque is
200ft-lbs.
4.Teflon tape or teflon
compound should not be used
because of its high lubricity, Teflon
makes it easier to tighten the pipe
to the hander joint past the point
where an effective seal is created,
thus damage to the coil could result.
5. "White Zinc" compound / pipe sealer
on all threaded connection is
recommended, instead.
Note: DRAIN AND
CONNECTIONS ARE PROVIDED AS
STANDARD ON COIL HEADERS. IF
EXTENEDED DRAINS AND VENTS
ARE REQUIRED, THEY MUST BE
FIELD PROVIDED.
Unit Installation
!
TO AVOID DAMAGING THE COIL
or 6-
CONNECTION IT IS ESSENTIAL
TO GRIP THE PIPE CONNEC-
TION
COUNTER
TIGHTEN THE JOINT (REFER TO
piping is
FIGURE 3) USE "BACK-UP
WRENCH" WHEN ATTACHING
PIPING
THERADED CONNECTIONS.
through the
Figure 3
Typical Piping for Water Coil
Condensate Drain Con-
nections
piping
!
FAILURE TO PROVIDE ADEQUATE
CONDENSATE PIPING MAY RESULT
IN WATER DAMAGE TO THE
EQUIPMENT OR BUILDING. DRAIN
TRAPS MUST BE PRIMED. IF THEY
ARE NOT, THE TRAP IS ESSEN-
TIALLY NON-EXISTENT AND DRAIN
PAN WILL LIKE OVERFLOW.
The threaded condensate drain
VENT
connection is provided on the coil
section drain pan. Pitch the line
downward toward an open drain and
install a plugged Tee to facilitate
cleaning. Condensate lines should not
be connected to a closed drain. This
is to avoid the possibility of drawing
sewer gasses into the unit. Make sure
the drain pan connection opening is
unobstructed. Trap the drain line as
IMPORTANT
WHILST APPLYING
PRESSURE TO
TO COILS, ON
CAUTION
6
TRANE
shown in Figure 4. Drain Connection
size is 1" BSPT for all units.
Electrical Connection
All electrical line sizing, protection and
grounding must comply with all
National Electric and local electrical
codes.
The contractor must also furnish an on/
off switching system, thermostat (if
controlled temperature is desired) and
fuse disconnect switch in compliance
with national/local electrical codes, if
not supplied by Trane. Refer to General
Specification, for electrical cha-
racteristics of motors.
WARNING
!
DISCONNECT ELECTRICAL
POWER SOURCE
SERVICING THE UNIT
CONNECTION ELECTRICAL
WIRES. FAILURE TO DO SO MAY
RESULT IN PERSONAL INJURY OR
DEATH FROM ELECTRICAL SHOCK
OR ENTANGLEMENT IN MOVING
PARTS.
CAUTION
!
USE COPPER CONDUCTORS
ONLY FOR TERMINAL CON-
NECTIONS. USE OF ALUMINIUM
OR OTHER TYPE OF WIRING MAY
RESULT IN GALVANIC CORROSION
OR OVERHEATING AND RE-
SULTANT EQUIPMENT DAMAGE.
®
BEFORE
OR