MCAC-RTSM-2014-03 R410A Rooftop Package Unit 60Hz
15. Installation
15.1 Lifting
Rigging cables should have adequate capability to resist 3 times weight of unit. Before lift, please check and
ensure that hooks are holding tightly to unit and lifting angles are no less than 60°.
Cloth material or hard-paper should be padded in the contact place between unit and rigging cable. Rigging
cable should be entwined a round at the hook for preventing danger by cable slip because of weight
unbalance.
During lifting, anyone forbidden lingering under the lifting unit.
15.2 Service Space
1. The recommended clearances for single-unit installations are illustrated in following Fig.
These minimum requirements are not only an important consideration when determining unit placement, but
they are also essential to ensure adequate serviceability, maximum capacity, and peak operating efficiency.
2. Any reduction of the unit clearances indicated in these illustrations may result in condenser coil starvation
or the recirculation of warm condenser air. Actual clearances which appear to be inadequate should be
reviewed with a local engineer.
Overhead air
Clearance≥1.55m
0.6m
0.3m
0.5m
0.8m
15.3 Rooftop -- units
For rooftop applications using a field fabricated frame and ducts, according to the following procedure:
1) The frame must be located and secured by bolting or welding to the roof. Flashing is required.
2) The hole in the roof must be prepared in advance of installing the unit.
3) Secure the ducts to the roof.
4) Place the unit on the frame or roof curb.
5) Secure the unit to the frame or roof curb.
6) Insulate any ductwork outside of the structure with at least two (2) inches of insulation and then
weatherproof. There must be a weatherproof seal where the duct enters the structure.
7) Complete the installation according to the instructions.
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