Page 4 of 15
INSTALLATION OF THE UNIT
Unit Support
1. The figure shows the use of the roof curb available for mounting these units.
2. The curb should be sealed and fixed to the roof by weather stripping. A suggested means of sealing
the
unit and roof curb as shown in the left.
Duct construction
- These units are equipped with supply and return air openings. Duct connection to the unit
should
be made with duct flanges and secured directly to the air opening with flexible duct
conn
ectors to avoid normal noise transmission.
- To prevent air leakage, all duct seams should be sealed.
- Ducts in the spaces that not air-conditioned, must be insulated.
- Ducts exposed to the outside must be weather proofed.
- Ducts that entering building through the roof, the entering should be sealed with weather
stripping
to prevent the rain, sand, dust etc. from entering the building.
- Correct size of filter must be installed at the return air duct.
Refrigerant Charge
The units are full charged in Factory, no additional charge is necessary. The table below shows the
amount
charged pre unit.
Re
frigerant R-410A
Model
Charge in circuit (kg)
SRT-30RA 1.35
INSTALLATION OF THE UNIT
Drain piping
- A 1 MPT condensate drain fitting is provided. The drain pipe can be led out at the front side.
- The drain pipe must be provided with a trap on the outside of the unit and also installed at an
incline for proper drainage, as shown in the right.
- To prevent condensate formation and leakage, provide the drain pipe with insulation to
sa
feguard against sweating
.
- Upon completion of the piping work, check that there is no leakage and that the water drains
off properly
.
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