Below are the three basic principles of how HVAC Refrigeration works. Specific copper material
selection, storage, brazing works and installation procedures must be followed.
MOISTURE FREE
DIRT FREE
LEAK FREE
Dry I No Water
Clean I No Material Debris
Tight/ No Leakage
1.
2.
3.
4.
Deterioration of Oil
Compressor insulation failure
Blocking of Expansion Valve
Dirt can easily clog the
capillary tubes.
1. Always seal all pipe openings
until joining of pipes is
completed.
2. Do not place pipes directly on
or scrape the ground.
3. Point the pipe downward
4. When inserting pipes through
openings in walls, be sure to
cap both ends of the pipe
5. Blow nitrogen while brazing
REAMING
ASSEMBLY
DON'T DO IT!
Bad Brazing
I
Oxidation Flakes because
of No Nitrogen Purging
Does not have
uniform solder
FLARING
While copper tube is usually connected by brazing, there are times when a mechanical joint may
be required or preferred. Flared fitting can be an alternative when the use of open flame is neither
desired nor impractical. A flare joint should be made with appropriate tools.
DON'T DO IT!
Cracked fiares
3.1FLARE NUT
Clean the fiare nuts and align
the center of the flare joints.
Insufficient fiaring.
groove has formed
Dirty fiares
TIGHTENING
Do not screw the fiare nut at
an angle. This will damage
the threads and cause leak.
Tighten fiares by hand. It is
not aligned if the nut does not
""""=-,. 1
P I P I NG R E L A T I V E T O CONDENS E R
(COM PRESSOR I N S I D E ) A N D F A N COI L U N I T
(FCU) L O C A T I O N
Pipe insulation can prevent condensation as the surface temperature of the insulation will vary
from the surface temperature of the pipe. Condensation will not occur, provided that (a) the insulation
surface is above the dewpoint temperature of the air; and (b) the insulation incorporates
some form of water-vapour barrier or retarder that prevents water vapour from passing through
the insulation to form on the pipe surface. The most common insulation for refrigerant piping is
the Closed Cell Rubber Insulation.
Wrapwrth w,yl tape.
lnsuatedpipe p,CMded
ll'ael off paper to apply.)
Gas-sidepipe
lnsuauonproVlded
Seal wrthvinyl tape.
•
)(
Avoid installing FCU
too low
Avoid installing FCU to
direct sunlight because 11
may affect unit performance
Avoid installing where
there are obstacles that
will affect the airflow
Install FCU back plates on
strong wall structures
Ensure secure fit of
1nstallat1on plates on the
wall to hook the unit
2.2 CEILING CASSETTE AND CONCEALED
(450.:450)
Check port
■
I
Provide a service manhole
of (450x450mm or larger)
for maintenance access to
electrical pipe connections
as well as filters
•
V,ew from front
View fromside
¼
Check the level of the unit by using a level gauge placed on the fiat top of the unit
Do slope upwards
the drain hose
Don't submerge the
ends of drain hose in
water
Do not put the
dra in ho se end
in the drain age ditdi .
Crnls and fan crnls normally have drain connections H1 wall mounted models comes with a
two (2) feet flexible drain hose If the line needs to be extended, a ½" PVC pipe maybe
connected to 11 When passing through the exit hole, always ensure that the flexible hose
doesn't get squeezed or twisted Never tap a drain line to a sewer The bad smell of the
sewer maybe sucked in by the Fan Crnl Unit
NOTE:
REFER TO CDP SIZE TABLE FOR PIPE SIZES.
- - ----,,&
-
- - - - - W'lECONNECTION
""ll= =al-- - - - --l
-
f-
-
-
sr.!2ofgc't&
TOCONOENSATEDRAINUNE
TAPPING POINT
CONDENSATE DRAIN INSTALLATION DETAIL ( FCU WITH DRAIN PUMP )
NOT TO SCALE
U
INATION
FCU COMPLm WITH COND£NSATE DRAIN PUMP
•
Do not ungroup circuit
conductors
\Vhi tc
I N e u tra l
B lack
I H o t-120\•nc
Gree n • G r o u n d
Do not interchange
Neutral and Ground
connection
Use the specified conduit
type and size as indicated
in the plan and specification
EMT SUPPORT
SECTION 348-13
3 feet of
Raceway support
raceway
termination
Maximum of 1Oft
between support
3 ft of raceway
termination
16 ft
*NOTE: Support is not required within 3 ft of a coupling
Rigid Conduits require support. Conduits should be fastened and supported at least every
10 feet. Conduits should be fastened within 3 feet of a box
Ferrule
Locknut
ompression
Ring
•
Use proper fittings in connecting Liquidtight Flexible Metallic Conduit to any electrical box
or equipment.
•
Pu8bcoo
Pull boxes shall be used when conduit run
contain bend totalling to more than 360°
Use a clamp for fixing conduit directly
on slab
Use Unistrut for Horizontal Conduit
Installation
Use Unistrut for Suspended Conduit
Installation
DON'T DO IT!
Do not forget to install a
bushing as it might damage
wire insulation.
Do not install PVC pipe
outdoor and under direct
Do not install Junction Box
one on top of the other.
Use NEMA 3R/IP64
enclosure for outdoor
1nstallat1on
Use NEMA 1/IP23
e nclosure for indoor
1nstallat1o
n
Tighten the transformer
terminals based on the
recommended torque
Electrical Testing
I Momum
A"'plable
Ciltllitsbetwe,n Ciluilbetween
III/ACan Sl1/ACandlVAC
dSll1/AC
11,\-0hm,
lM-Ohms
Readi111
Follow the standard
acceptable minimum
values of Insulation
Resistance Test
MOISTU
RE Ensure to dry.
up moisture inside
the pipe
Ensure dirt or
oxide compound
will be removed
Check for big leaks
METHODOLOGY
Install pressure reducing valve on
a nitrogen cylinder
Do not use any gas other than
Nitrogen
DON'T DO IT!
Do not use any gas
other than Nitrogen
Do not skip any
leak test procedure
Do not open the service
valve while testing for leaks
Do not tighten the flare
connection while
the system is under
high pressure
Do not insulate brazed
joints/elbow until initial
leak test is complete
I
METHODOLOGY