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Outdoor Air Series VRV AHU
Figure 17- Outdoor Air Series VRV AHU Unit
1.
Outdoor unit
2.
Control box
3.
Air Handling unit
4.
Microtech III
5.
Field piping (field supply)
6.
Expansion valve kit
7.
Outdoor unit power supply
8.
Control box wiring
9.
Air handling unit thermistors
10.
Control wiring for control box and
Microtech III
11.
Power supply and control wiring
for air handling unit and controller
12.
Remote controller
5.6 Coil Installation/ Pipe Connection
5.6.1 General
The coil will perform as per rating only if
the airflow is uniformly pass-through the
coil surface.
IMPORTANT
HIGH VELOCITY SPOTS ON THE
COIL MAY CAUSE MOISTURE
CARRY
OVER.
THEREFORE,
UNIFORM AIRFLOW ACROSS COIL
SURFACE IS CRUCIAL.
External pipe-work must be adequately
supported to ensure load-free towards coil
connections. Swing joints or flexible
fittings are to be provided in all piping
connections, particularly those adjacent to
heating source, to absorb expansion and
contraction strains. Failure to comply will
result in damage to the coils & headers.
IMPORTANT
TO AVOID DAMAGING THE COIL
CONNECTIONS AT COIL HEADER,
IT IS ESSENTIAL TO HOLD THE
CONNECTOR / PIPE WITH TOOLS
WHILST
APPLYING
COUNTER
FORCE TO TIGHTEN THE JOINT.
(See Figure 18)
Figure 18 – Coil header connection method
Figure 19
–
Bulb orientation and position
Figure 19 shows the correct mounting
method and the position of TXV sensing
bulb according to the piping size.
IMPORTANT
WRAP WET CLOTH AROUND PIPE
BEFORE PERFORM BRAZING TO
PREVENT OVERHEAT PIPE AND
DAMAGE COMPONENT AT PIPING.
(
Figure 20
)
Figure 20 – wrap wet cloth before brazing
AFTER PIPE-WORK DONE, SITE
INSTALLER MUST WRAP THE PIPE
CONNECTION WITH INSULATION
AND SEAL THE HOLES BETWEEN
PIPE CONNECTIONS AND PANEL.
5.6.2 Water Coil
Water supply, water return, drains and
vents connections are extending through
