Johnson Controls DSH024C Series, Установка, эксплуатация и обслуживание

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9
FORM 145.32-IOM5
ISSUE DATE: 08/30/2018
1
Models 2–8 tons can be ordered as packaged, factory-
charged unitized packages, or as factory-split. The 10
ton model comes factory-split.
All units are lined with 1/2-inch thick and 2 pound den-
sity acoustical insulation to ensure quiet operation. All
models are provided with medium-efficiency 2-inch
thick throwaway filters rated MERV 7.
The 2–5 ton units use a single scroll compressor. The
8–10 ton units use a dual scroll compressor with two
independent refrigerant circuits. The 8 ton unit uses one
single speed scroll compressor and one two-stage scroll
compressor, giving the unit three effective cooling stages.
The 10 ton unit features two 2 stage compressors, which
allows for four stage cooling.
All units come standard with a Smart Equipment (SE)
microprocessor control board with safety controls and
troubleshooting LEDs (see Microprocessor Controller
on page 41 for more details).
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 ac-
cessory 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 ambi-
ent, which is needed to maintain a proper refrigerant
head pressure.
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. Re-
port to the carrier any torn or broken packaging, or
scratched or dented panels.
Prior to installation, internally inspect all units. Re-
move 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 opera-
tion, repair any damage.
Record any unit damage on the Bill of
Lading and report to carrier and factory
immediately. Shipping and handling dam-
ages are not warranty items.
Prior to mounting unit, check individual
unit weights ( Table 1 on page 11 ) and
verify lifting capacity of lifting equipment
exceeds weight of units by safe margins.
Failure to do so may result in unit dam-
age, personal injury, or even death.
Rigging
To ensure safe installation of the unit when a ceiling
mount application is specified, estimate the unit's ap-
proximate center of gravity. The configuration of in-
ternal components for each unit is different and the
weight is unevenly distributed.
Determine the actual center of gravity of
the unit by performing a test lift. Lifting
an unbalanced unit can cause personal
injury, or even death.
SECTION 1 – INSTALLATION