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Cable Type Water Detector
Important:
Do not allow the cable water detector to
contact metal (frame or condensate pan). It
must be mounted on the plastic stand-offs
provided with the water detector.
Figure 13. Cable type water detector
Do not allow the cable water detector to contact metal
(frame or condensate pan). It must be mounted on the
plastic stand-offs provided with the water detector.
Lay the cable water detector across the surface where
water could collect. When water is present, current will
flow between the two wires. A two conductor wire harness
is provided with a quick connect fitting on the end. The
harness mates to the fitting on the water detector cable
and connects it to the terminal block inside the electric box.
Air Distribution Connection
Spot Cooler
For units that are not ducted
conditioner should be mounted above the ceiling grid,
leaving sufficient space for the air grilles to rest on the
ceiling T-bar.
Placement of the grilles is important. The hinged filter
grille goes on the return air side of the unit. The 3-way
directional grille goes on the conditioned air discharge
side of the air conditioner. Gasketing is factory-supplied
for the air seal between the bottom flange of the air
conditioner and the grille. After mounting the air
conditioner, attach the gasket to the bottom flange, then
lower the air conditioner until the gasket meets the grille,
as shown in
Figure 8, p.
14.
Ducted Systems
There are three basic configurations of airflow patterns:
90º/right angle, straight-through and in/out-same-face
(see Figure 9). When determining ducting requirements,
always consult your local and state codes. The duct system
should be designed to allow the air to move with as little
resistance as possible. Several factors determine ducting
material and size. These factors are pre-determined, refer
to your ducting system schematic.
The connection of ducting to the unit is typically
accomplished with a 1 in. duct flange. Supply air outlet and
return air inlet ducts will require a field-provided duct
flange (refer to the installation drawing provided with the
unit). The connection of ductwork to the unit may be made
with either pop rivets or self-tapping screws.
AH-SVX008C-EN
(Figure 8, p.
14), the air
Piping Connections
Refrigerant
Self-Contained Systems
No refrigeration connections are required for self-
contained air, water or glycol-cooled systems (Models TR-
OHS- 012/040-AS, TR-OHS-012/120-C and TR-OHS-012/
120- W/G-( )).
Split Systems
Split air-cooled systems will require field refrigeration
piping. All split systems are shipped with a dry nitrogen
charge of 100 psig. Systems utilizing a remote condenser
will require a copper liquid line and discharge line (see
section
"Remote Air Cooled Condensers (AR Models),"
p.
19). Systems utilizing a remote condensing unit (RCU)
will require a copper liquid line and suction line (see
section
"Remote Air Cooled Condensers (AR Models),"
p.
19).
All refrigeration piping should be installed with high
temperature brazed joints. Use standard refrigeration
practices for piping supports, leak testing, dehydration
and charging of the refrigeration circuits. The refrigerant
piping should be isolated by the use of vibration isolating
supports.
Provide supports (clamps or hangers) as necessary every
5 to 10 ft along piping runs to minimize vibration and noise
transmission. To reduce vibration transmission and
prevent pipe damage, use a soft flexible material to pack
around the piping when sealing openings in walls.
Wrap wet rags around the pipes between the areas to be
soldered and any nearby refrigeration components to
keep excessive heat from traveling through the pipe and
causing damage. Clear all pipe connections of debris and
prep connections for soldering. Use only "L" or "K" grade
refrigerant copper piping. Be careful not to allow solder/
piping debris to get inside refrigerant lines. Silver solder
containing a minimum of 15% silver is recommended. Dry
nitrogen should be flowing through the tubing while
soldering at a rate of not less than 1-2 CFM.
Refrigerant lines for split systems must be sized according
to the piping distance between the evaporator and the
condenser/condensing unit. Each valve, fitting and bend in
the refrigerant line must be considered in this calculation.
Pipe sizes are given for "equivalent feet", not linear feet. Do
not confuse the terminologies. For example, a 7/8 in.
standard 90° elbow has an equivalent length of 1.5 ft; a 7/
8 in. branch Tee has an equivalent length of 3.5 ft. These
corrections must be accounted for when sizing your
piping. Refer to the following table for standard equivalent
lengths, in feet, of straight pipe.
Installation
17
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