Installation
All models 8–25 tons ship in separate parts: a condensing unit and an evaporator section. The 5-
ton models ship as factory charged unitized packages. All models are designed for freestanding
mounting on the floor or on a field fabricated structural steel stand. All models can be ordered as
either a vertical or horizontal supply fan discharge orientation. This can be combined with standard
rear return air (RA) or optional front RA configuration (see dimensional drawings in
for more details).
The 5 ton model utilizes a single stage compressor. The 8–25 ton models are dual compressor units
with two independent refrigerant circuits. The 8–12 ton units are assembled from the following
components:
•
A single speed scroll compressor
•
A two stage scroll compressor
This configuration gives 8–12 ton units three effective cooling stages. The 15, 20, and 25 ton units
feature two 2 stage compressors. This configuration gives these units four stage cooling units.
The 8–25 ton models require the field connection of piping and charging of the refrigerant circuits.
The models ship with only a nitrogen holding charge. See the
charge information.
All units come standard with a Smart Equipment (SE Controller) microprocessor control board with
safety controls and troubleshooting LED (see
Units operate reliably at outdoor ambient down to 50.0°F. In applications requiring operation below
this temperature, either a low ambient damper field kit accessory or low ambient control featuring
a variable frequency drive (VFD) on condenser fan is available (condenser fan VFD is available as a
factory installed option only on 8 and 10 ton units).
The damper is installed on the condenser air discharge and is allowed operation to 0.0°F ambient.
The VFD on the condenser is factory installed on the corner post in the condenser section of the
unit. The VFD on the condenser allows operation to 0.0°F ambient, which is needed to maintain a
proper refrigerant head pressure.
CAUTION
Only qualified personnel should perform installation and service of this equipment.
Pre-installation inspection of equipment
All units are factory tested to ensure safe operation and quality assembly. The units are packaged
and sealed on shipping skids and ship in first class condition. Report to the carrier any torn or
broken packaging, or scratched or dented panels.
Prior to installation, internally inspect all units. Remove all the access doors and check for visual
defects that can occur during transport. Any problems found internally should be immediately
reported to the carrier and the manufacturer. Check the refrigerant circuit to ensure no leaks have
occurred during shipment.
Install the gauge set to high and low pressure ports to confirm the pressure has been maintained
and no leaks have occurred during shipment. To ensure safe operation, repair any damage.
See
Appendix A: Unit dimensional drawings
for unit dimensional drawings.
9
D-Series Vertical (DSV060C-300C) Air-Cooled Self-Contained Units, C Generation with Smart Equipment Controller
Johnson Controls
