Johnson Controls
5513350-JTG-1018
6
Features and Benefits (Continued)
Maximized serviceability is also available with op
-
tions such as replaceable core filter driers as well as
discharge, liquid, and suction line isolation valves.
The standard unit is equipped with accessible sight
glasses to verify proper refrigerant flow as well as
conveniently located condenser coil cleaning hatch-
es to facilitate maintenance.
3.
Direct Drive Plenum (DDP) Supply Fan
(
Item 3 in
)
A direct drive plenum (DDP) supply fan (
)
provides outstanding reliability and efficiency, such
as eliminating the possibility of interrupting condi-
tioned air supply due to a broken belt or polluting
conditioned air with belt dust. The supply fan can
be optionally equipped with an airflow measurement
station to precisely measure the amount of air deliv-
ered to the conditioned space.
The speed of the supply fan is controlled by a vari-
able frequency drive (VFD). A redundant VFD is
optionally available to ensure uptime in the unlikely
event of a VFD failure.
4. Heating Options
(
Item 4 in Figure 3
Gas heat options are available either in staged or
modulating control. The flexibility of heater sizes
meets the specific application heating needs. Electric
heat is also available with size and staging/modulat
-
ing options (
). Either hot water or steam heat
options are also available. All modulating heat op-
tions can be controlled precisely to temper the sup-
ply air, which is especially important when fresh air is
needed in cold climates.
5. Double Wall Construction
(
Item 9 in Figure 3
The air handler section of the rooftop unit provides
foam injected double wall construction for maximum
unit rigidity and cleanability of the interior surfaces
for long term indoor air quality (IAQ). This construc
-
tion of the walls, roof, and floor provides an insulating
value that minimizes unit sweating and contributes to
the overall unit efficiency.
LD27636
Figure 4:
DDP Supply Fan
LD27637
Figure 5: Electric Heat
6.
Controls System
(
)
The rooftop unit’s sophisticated options are intelli-
gently controlled by a best-in-class controls platform
built exclusively for this application.
A 5.5-inch,
5 row × 35 character (256 × 64 dot matrix)
organic light-emitting diode (OLED) display (
) with full numerical and optimized navigational key
-
pad, conveniently located in the low voltage compart
-
ment, is the nerve center. The control system can be
optionally augmented with a WiFi hotspot capability
for local or line-of-sight smart device control.
The control platform minimizes commissioning time
when connected to the Verasys
™
Building Automa-
tion Systems (BAS), with self-discovery of the rooftop
unit and its points by the BAS.
