Features and Benets ............................................................................................................................................................5
Electrical Data ......................................................................................................................................................................67
Weights and Dimensions ......................................................................................................................................................84
Unit Placement ...................................................................................................................................................................109
• Cooling only units with heating options including
gas, electric, steam or hot water with modulation
• Exhaust or return fan options
• Various airflow path configurations for discharge
and return/exhaust air
• Optional humidifier, sound attenuator, or air blender
• Low ambient temperature option
• Variable frequency drive (VFD) options on all
fans (Figure 1)
2
Figure 1: VFD Displays
Johnson Controls
LD27639
Product Highlights and Options (Continued)
5513350-JTG-1018
• Reliability and Serviceability
• Multiple refrigeration circuits
• Coil corrosion protection option
• Convenience outlet option
• Optional viewports
• Single point latching door option
• Internal air handler light option
• Replaceable core filter drier option
• Suction, liquid, and discharge line shutoff valve
options
• Pressure transducer options
• Start-up wizard
• Indoor Environmental Quality
• Double wall construction with foam insulation
• Modulating hot gas reheat (HGRH) option
• Final filtration options, including high efficiency
particulate air (HEPA) filters
• Ultraviolet (UV) lights option (Figure 2)
• Controls
• 5.5-inch, 5 row × 35 character (256 × 64 dot matrix) organic light-emitting diode (OLED) display
with full numeric keypad and navigation buttons
as standard
• Optional WiFi hotspot capability via a mobile ac-
cess portal (MAP) device provides additional unit
control when it is not always possible to physi-
cally access the unit
• Smart Equipment technology enabling self-discovery on Verasys™ Building Automation Sys-
tems (BAS)
• The controller supports the BACnet
®
cation protocol and is designed and certified by
BACnet Testing Laboratory (BTL) to meet the requirements of the advanced application control
profile
• Twinning algorithms to allow multiple units to
function as one on common supply and return
duct shafts
• Variable air volume (VAV) and single zone VAV
(SZVAV) control
• Building pressurization controls
communi-
• Stainless steel drain pan
• Condensate overflow switch option
• Airflow measurement options for outside air, sup-
ply fan, and return fan
LD27640
Figure 2: UV Lights
Johnson Controls
3
5513350-JTG-1018
Component Location
Exhaust Air
13
5
4
2
1
3
8
9
11
10
6
7
12
1. Economizer
2. Evaporator coil
3. Direct drive plenum (DDP) supply fan
4. Modulating or staged gas heat
Figure 3: 25–50 Ton Packaged Rooftop Unit Cabinet Assembly
4
Outside Air
5. Condenser maintenance safety tie-off
6. Condenser fans
7. Scroll compressors
8. Condenser coil cleaning hatch
LD26878
9. Double wall construction
10. Unit controller
11. Filter section
12. Collapsible rain hoods
13. Exhaust/return fan
Johnson Controls
5513350-JTG-1018
Features and Benefits
General
The 25–50 ton packaged rooftop platform is designed with
all the flexibility needed for today’s applications but with
tomorrow's requirements in mind. Realizing that efficiency
requirements are continuously pushing the envelope of
technology, the NexusPremier™ delivers today the energy
efficiency levels exceeding those mandated by the U.S.
Department of Energy for 2023. All cooling only and electric heat units have an integrated energy efficiency ratio
(IEER) in excess of 13.2. All units with gas or hydronic heat
have an IEER in excess of 13. For these particular rooftop
units, when equipped with a variable speed drive compressor, they deliver efficiency levels in excess of those suggested by the highest tier of the Consortium of Energy Ef-
ficiency (CEE) for 2019.
The NexusPremier is also designed for serviceability. With
small details—such as a maintenance safety tie-off (Item 5 in
Figure 3) on the roof of the condenser section that complies
with OSHA requirements, along with a single handle latching
mechanism for doors—the unit was designed for easy service. Options to make the unit serviceable include a convenience outlet to power lights and tools; internal lights in the air
handler section; viewports in doors of serviceable compartments to enable easier unit inspection; and extended grease
lines to simplify fan bearing lubrication for belt-driven fans.
Standard direct drive supply fan (Item 3 in Figure 3) do not
require lubricating fan bearings or changing belts. Numerous
refrigeration options are also available, including replaceable
core filter driers, liquid and suction isolation valves, as well as
high and low pressure transducers in each circuit that enable
easier sub-cooling and superheat measurements.
Besides options, there are also standard features to ensure
straightforward and safe servicing of the units, including
coil cleaning hatches (Item 8 in Figure 3) in the condenser
section to make cleaning condenser coils effortless, and
door safety latches to keep doors safe when opened in a
pressurized compartment. A discrete high and low voltage
compartment minimizes the amount of safety equipment re-
quired when only the low voltage compartment is accessed.
Selection Navigator is an online program available to assist in providing unit selections, performance reports, and
outputs to assist in design of the unit. Certain options may
require the assistance of the local sales office.
In order to facilitate its application, Selection Navigator
also provides building information modeling (BIM) files of
the specific unit selected. This aids in modeling placement
and integration of the rooftop unit into the overall building
design.
This packaged rooftop product is a sophisticated, highly
configurable rooftop unit. A controller is standard on each
unit with specific sequences of operation correlated to the
options selected. The Selection Navigator provides the
specific sequences of operation for the unit options select-
ed, eliminating confusion of the unit's capability.
Although the many options make customizing unlikely, it is
possible to have custom mechanical and sequences of operations designed into the unit from the factory for ultimate
convenience and reliability.
1. Economizer (Item 1 in Figure 3)
In order to deliver maximum efficiency, rooftop units
need an efficient economizer. The rooftop unit offers
various options for economizer control and fault de-
tection, as well as damper leakage rates and cycle
life to meet different regulatory requirements.
The amount of fresh air can also be optionally measured to ensure and record appropriate fresh air to
the conditioned space. An air blender option is also
available to deliver optimal comfort to the conditioned
space.
2. Refrigeration System (Items 2, 6, and 7 in Figure 3)
The refrigeration system is built to reliably deliver
cooling through a variety of loads. Two independent
refrigeration circuits ensure that in the unlikely event
of a compressor failure, the second circuit can still deliver cooling to the space. An interlaced tube and fin
evaporator provide maximum cooling performance
even at part loads. The microchannel condenser re-
duces the risk of refrigerant leaks and minimizes the
amount of refrigerant in the unit.
Standard fixed speed scroll compressors of different sizes deliver excellent part-load efficiency and
control, which eliminates the need for inefficient hot
gas bypass valves at low load conditions. Optional
variable speed drive scroll compressor configurations are available for stable and efficient discharge
air temperature (DAT) control regardless of the load.
For application flexibility, optional corrosion protection is available for the evaporator and condenser, as
well as intrusion protection options for the condenser.
Realizing that the refrigeration system is the heart
of the rooftop, when optionally equipped with transducers, the unit controller can display sub-cooling or
superheat. Additionally, low ambient operation is an
available option with a variable speed condenser fan.
Johnson Controls
5
5513350-JTG-1018
Features and Benefits (Continued)
Maximized serviceability is also available with options 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 hatches to facilitate maintenance.
3. Direct Drive Plenum (DDP) Supply Fan (Item 3 in
Figure 3)
A direct drive plenum (DDP) supply fan (Figure 4)
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 delivered to the conditioned space.
LD27636
Figure 4: DDP Supply Fan
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/modulating options (Figure 5). Either hot water or steam heat
options are also available. All modulating heat options 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 construction of the walls, roof, and floor provides an insulating
value that minimizes unit sweating and contributes to
the overall unit efficiency.
LD27637
Figure 5: Electric Heat
6. Controls System (Item 10 in Figure 3)
The rooftop unit’s sophisticated options are intelligently 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)
6) with full numerical and optimized navigational key-
pad, conveniently located in the low voltage compartment, 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 Automation Systems (BAS), with self-discovery of the rooftop
unit and its points by the BAS.
6
Johnson Controls
5513350-JTG-1018
Features and Benefits (Continued)
The unit controller has sequences of operation for
standalone applications. These sequences cover
simple applications such as single zone variable air
volume (SZVAV) control of the supply fan and compressors in accordance with ASHRAE 90.1-2016,
as well as demand control ventilation (DCV) that
ensures adequate fresh air to the building. Complex
applications are also supported, like the twinning of
multiple rooftops on a common supply and return
duct shaft for the ultimate in redundancy for critical
spaces, such as Medical Office Buildings (MOBs).
7. Blank Section (Figure 7)
Blank sections can be provided for field installed ac-
cessories or to accommodate the installation of specific factory components including an air blender, final filters, humidifier, or sound attenuator.
The rooftop unit can be equipped with a final filter
before the conditioned air is delivered from the rooftop into the supply duct. Various final filter options
are available to meet critical needs including high ef-
ficiency particulate air (HEPA) filtration. Differential
pressure measuring options can be supplied to meet
the requirements for ASHRAE 170-2017.
For cold northern climates where heat tends to dry
out the supply air, a humidifier option with a stainless
steel drain pan is also available.
In order to mitigate sound originating in the rooftop unit
from reaching the conditioned space, optional sound
attenuators in the rooftop unit can be factory-installed.
8. Exhaust/Return Fan (Item 13 in Figure 3)
The rooftop units enable installation flexibility with the
option of either exhaust or return fan to control the
building static pressure. Return ductwork with shorter runs and lower static requirements usually only
need an exhaust fan. The return fan is available to
overcome the static imposed by longer return ducts.
Refer to the Variable Air Volume for Rooftop Units
Application Guide (Form 5515844-JAD).
Figure 6: OLED Display
Figure 7: Final Filter Section
Final Filters
Blank Section
LD27638
LD26881
Optional airflow measurement is available for units
equipped with a return fan. This makes it possible
to precisely understand and log the different airflows
through the rooftop unit.
9. Hot Gas Reheat (HGRH) (Figure 9)
Occupant comfort can be a challenge during shoul-
der months when low loads and high humidity occur.
In many cases, the combined efforts of refrigeration
system compressor multistep control, an interlaced
evaporator coil, and the supply fan modulation of SZVAV control are sufficient. The rooftop unit provides
an optional modulating hot gas reheat (HGRH) coil
to further reduce the humidity level within the space.
10. Indoor Air Quality (IAQ)
To meet the critical needs of IAQ, the rooftop unit
provides a stainless steel evaporator drain pan for
longevity and to facilitate cleanability. The drain pan
can be optionally equipped with an overflow switch to
warn of improper drainage and minimize the potential
for damage to the conditioned space. Ultraviolet (UV)
light banks are also an available option that minimize
mold and bacteria growth and assists in keeping the
evaporator coil clean.
Johnson Controls
7
5513350-JTG-1018
Features and Benefits (Continued)
11. Energy Recovery Wheel (ERW) (Figure 8)
The rooftop unit provides an option for an energy re-
covery wheel (ERW) as an integral part of the unit.
This device uses exhaust air to condition the fresh
air brought into the unit and the conditioned space,
increasing the overall rooftop efficiency. As a factoryinstalled option, the ERW ensures reliability, minimizes field labor, and simplifies long-term maintenance
of the device.
12. Airow Flexibility
Whether a rooftop unit is mounted on a roof or on a
grade, the orientation of airflow from the rooftop to
the conditioned space and vice versa is important.
The NexusPremier was specifically designed to provide discharge airflow either at the bottom, top, left,
or right.
Similarly, the return airflow is designed for maximum
flexibility vertically in either direction as well as hori-
zontally in either direction. Depending on selected
options, an end return is also possible. This airflow
flexibility minimizes installation costs and maximizes
possible locations for this flexible rooftop unit.
A: Cooling Only
B: Staged Gas Aluminized Burner
C: Staged Gas Stainless Steel
G: Modulating Gas Stainless Steel
K: Steam Coil
L: Hot Water Coil
M: Electric Heat
Digit 6A: Electric Heat Capacity
0: None
1: Low Heat
3: High Heat
4: Low Heat with Silicon Controlled Rectifier
(SCR)
6: High Heat with SCR
1: Low Heat without Valves
2: Low Heat with Valves
3: High Heat without Valves
4: High Heat with Valves
Digit 7: Unit Type
A: Single Zone VAV (SZVAV) (No Duct Pressure
Transducer)
B: Variable Air Volume (VAV) (Duct Pressure
Transducer)
Digit 8: Motor Control Options
1: Supply Fan Variable Frequency Drive (VFD)
2: Supply Fan VFD with Line Reactor
3: Supply Fan VFD with Bypass (Redundant
VFD)
4: Supply Fan VFD with Line Reactor and
Bypass (Redundant VFD)
5: Supply Fan VFD and Return/Exhaust Fan VFD
6: Supply Fan VFD with Line Reactor and
Return/Exhaust Fan VFD with Line Reactor
7: Supply Fan VFD and Return/Exhaust Fan
VFD with Bypass (Redundant VFD for Supply
Fan and Bypass for Return or Exhaust Fan)
8: Supply Fan VFD with Line Reactor and
Return/Exhaust Fan VFD with Line Reactor with Bypass (Redundant VFD for Supply Fan
and Bypass for Return or Exhaust Fan
Digit 9: Voltage
A: 208-230 V 3Ph 60 Hz, Single Point Terminal
Block
B: 208-230 V 3Ph 60 Hz, Dual Point Terminal
Block
C: 208-230 V 3Ph 60 Hz, Single Point Non Fused DISC
D: 208-230 V 3Ph 60 Hz, Single Point Terminal
Block, 65KA Short-Circuit Current Rating (SCCR)
E: 208-230 V 3Ph 60 Hz, Dual Point Terminal
Block, 65KA SCCR
F: 208-230 V 3Ph 60 Hz, Single Point Non Fused DISC, 65KA SCCR
G: 460 V 3Ph 60 Hz, Single Point Terminal Block
H: 460 V 3Ph 60 Hz, Dual Point Terminal Block
J: 460 V 3Ph 60 Hz, Single Point Non-Fused
DISC
K: 460 V 3Ph 60 Hz, Single Point Terminal
65KA SCCR
L: 460 V 3Ph 60 Hz, Dual Point Terminal Block,
65KA SCCR
M: 460 V 3Ph 60 Hz, Single Point Non-Fused
DISC, 65KA SCCR
N: 575 V 3Ph 60 Hz, Single Point Terminal Block
P: 575 VA 3Ph 60 Hz, Dual Point Terminal Block
Q: 575 V 3Ph 60 Hz, Single Point Non-Fused
DISC
R: 575 V 3Ph 60 Hz, Single Point Terminal
65KA SCCR
S: 575 V 3Ph 60 Hz, Dual Point Terminal Block,
65KA SCCR
T: 575 V 3Ph 60 Hz, Single Point Non-Fused
DISC, 65KA SCCR
Block,
Block,
Digit 10: Return Configuration
A: Bottom Return, Right Outside Air (OA), Side
Exhaust
B: Bottom Return, Right OA, Front Exhaust
C: Bottom Return, Left OA, Side Exhaust
D: Bottom Return, Left OA, Front Exhaust
E: Top Return, Right OA, Side Exhaust
F: Top Return, Right OA, Front Exhaust
G: Top Return, Left OA, Side Exhaust
H: Top Return, Left OA, Front Exhaust
J: Left Return, Right OA, Front Exhaust
K: Right Return, Left OA, Front Exhaust
L: Front Return, Left OA, Right Exhaust
M: Front Return, Right OA, Left Exhaust
N: Bottom Return, No OA, No Exhaust Air (EA)
(No Return Fan Available)
P: Top Return, No OA, No EA (No Return Fan
Available)
Q: Left Return, No OA, No EA (No Return Fan
Available)
R: Right Return, No OA, No EA (No Return Fan
Available)
S: Front Return, No OA, No EA (No Return Fan
Available)
Digit 11: Discharge Locations
1: Bottom Discharge, from Discharge Plenum
2: Bottom Discharge, Discharge through Heat
Section
3: Top Discharge, from Discharge Plenum
4: Right Discharge, from Discharge Plenum
5: Left Discharge, from Discharge Plenum
6: Left Discharge, Discharge through Heat
Section
Digit 12: Supply Configuration
A: None
B: Small Blank
C, D: Large Blank
F:
Small Blank with Humidifier and Stainless Steel
(SST) Drain Pan
H, K: Large
L: Small Blank Sound Attenuator
M, N: Large Blank Sound Attenuator
P: Small Blank Final Filter
Q, T: Large Blank with Sound Attenuator and
S, V: Large Blank with Sound Attenuator and
Digit 13: Final Filter Options
1:
MERV 15 Bag Final Filters with 2-inch MERV 8
Filters
2: MERV 14 Rigid Final Filters with 2-inch MERV
8 Filters
3: MERV 17 High Efficiency Particulate Air
(HEPA) Final Filters with 2-inch MERV 8 Filters
4: MERV 14/15 Filter Rack (No Filters)
5: HEPA Filter Rack (No Filters)
6: None
Blank with Humidifier and SST Drain
Pan
Final Filter
Humidifier and SST Drain Pan
49
Johnson Controls
9
5513350-JTG-1018
Nomenclature (Continued)
Digit 14: Final Filter Control Options
0: None
1: Combined Pre and Post Filter Transducer
2: Separate Pre and Post Filter Transducer
3: Combined Pre and Post Filter Transducer and
Combined Magnehelic Gauge
4: Separate Pre and Post Filter Transducer and
Magnehelic Gauge
5: Combined Pre and Post Filter Magnehelic
Gauge
6:
Separate Pre and Post Filter Magnehelic Gauge
7: Combined Pre and Post Filter Transducer,
Separate Pre and Post Filter Magnehelic Gauge
Digit 15: Supply Fan
A: Direct Drive Plenum (DDP) Supply Fan with
1-inch Spring Isolation
B: DDP Supply Fan with 2-inch Spring Isolation
C: DDP Supply Fan with 2-inch Spring Isolation
5: Inlet Guard and Shaft Grounding Ring
6: Airflow Measurement Station and Shaft
Grounding Ring
7: Shaft Grounding Ring, Inlet Guard and Airflow
Measurement Station
Digits 19: Building Pressure Control
0: None
1: Barometric Damper
2: Exhaust with VFD and Backdraft Damper
3: Modulating Damper (On/Off Exhaust Fan Only
without VFD)
4:
Modulating Damper (Return Fan Only with VFD)
Digit 20: Return/Exhaust Fan
A: None
B: Exhaust Fan with 1-inch Spring Isolation
C: Exhaust Fan with 2-inch Spring Isolation
D: Exhaust Fan with 2-inch Spring Isolation and
Seismic Restraint
E: Return Fan with 1-inch Spring Isolation
F: Return Fan with 2-inch Spring Isolation
G: Return Fan with 2-inch Spring Isolation and
Seismic Restraint
Digit 21: Return/Exhaust Fan Motor
Horsepower
A: None
E: 3 HP
F: 5 HP
G: 7.5 HP
H: 10 HP
J: 15 HP
K: 20 HP
Ring
E: Belt Guards
F: Belt Guards and Shaft Grounding Ring
G: Return Fan Airflow Measurement Station
H: Return Fan Airflow Measurement Station and
Shaft Grounding Ring
J: Extended Grease Lines and Belt Guards
K: Extended Grease Lines and Belt Guards
and Shaft Grounding Ring
L: Extended Grease Lines and Return Fan
Airflow Measurement Station
M: Extended Grease Lines and Return Fan
Airflow Measurement Station and Shaft
Grounding
N: Belt Guards and Return Fan Airflow
Measurement Station
P: Belt Guards and Return Fan Airflow Measure-
ment Station and Shaft Grounding Ring
Q: Extended Grease Lines and Belt Guards and
Return Fan Airflow Measurement Station
R: Extended Grease Lines and Belt Guards and
Return Fan Airflow Measurement Station and
Shaft Grounding Ring
Digits 24: Return/Exhaust Fan Drive
A: None
B–K: RPM
Digit 25: Evaporator Options
G: Aluminum Fin Evaporator with SST Drain Pan
H: Aluminum Fin Evaporator with SST Drain Pan
with Condensate Overflow Switch
J: E-Coat Aluminum Fin Evaporator with SST
Drain Pan
K: E-Coat Aluminum Fin Evaporator with SST
Drain Pan with Condensate Overflow Switch
L: Copper Fin Evaporator with SST Drain Pan
M: Copper Fin Evaporator with SST Drain Pan
with Condensate Overflow Switch
Digit 26: Condenser Coil Options
1: None
2: With Wire Guards
3: Full Louvered Panels
4: Partial Louvered Panels
5: E-Coat Condenser without Guards
6: E-Coat Condenser with Wire Guards
0: None
1: Combined Pre and Post Filter Transducer
2: Separate Pre and Post Filter Transducer
3: Combined Pre and Post Filter Transducer and
Combined Magnehelic Gauge
4: Separate Pre and Post Filter Transducer and
Magnehelic Gauge
5: Combined Pre and Post Filter Magnehelic
Gauge
6:
Dual Enthalpy Economizer, Low Leak Dampers
F: Dry Bulb Economizer, Low Leak Dampers
with Air Measurement Station
G: Single Enthalpy Economizer, Low Leak
Dampers with Air Measurement Station
H: Dual Enthalpy Economizer, Low Leak
Dampers with Air Measurement Station
Dampers with Air Measurement Station
U: Single Enthalpy Economizer, Ultra Low Leak
Dampers with Air Measurement Station
V: Dual Enthalpy Economizer, Ultra Low Leak
Dampers with Air Measurement Station
10
Johnson Controls
Nomenclature (Continued)
5513350-JTG-1018
Digit 30: Energy Recovery Options
0: None
1: Low CFM Energy Recovery Wheel (ERW)
without VFD
2: Low CFM ERW with VFD
3: High CFM ERW without VFD
4: High CFM ERW with VFD
Digit 31: Refrigeration System
Piping Options
A: None
B: Suction and Discharge Valves
C: Suction, Discharge, and Liquid Valves
D: Suction, Discharge, and Liquid Valves with
Replaceable Core Filter Driers
E: Hot Gas Reheat (HGRH)
F: Suction and Discharge Valves with HGRH
G: Suction, Discharge, and Liquid Valves with
HGRH
H: Suction, Discharge, and Liquid Valves with
Replaceable Core Filter Driers with HGRH
N: E-Coat HGRH
P: Suction and Discharge Valves with E-Coat
HGRH
Q: Suction, Discharge, and Liquid Valves with
E-Coat HGRH
R: Suction, Discharge, and Liquid Valves with
Replaceable Core Filter Driers with E-Coat
D: Supply Smoke Detector
E: Return Smoke Detector
F: Supply and Return Smoke Detector
G: Convenience Outlet with Supply Smoke
Detector
H: Convenience Outlet with Return Smoke
Detector
J: Convenience Outlet with Supply and Return
Smoke Detectors
K: Convenience Outlet and Internal Lights with
Supply Smoke Detector
L: Convenience Outlet and Internal Lights with
Return Smoke Detector
M: Convenience Outlet and Internal Lights with
Supply and Return Smoke Detectors
Digit 33: Controls Options
A: None
B: Low Ambient
D: Subcool and Superheat Measurement
E: Low Ambient with Subcool and Superheat
Measurement
Digit 34: Interface Options
A: BACnet® MS/TP, Modbus™, N2
B: BACnet IP
G: BACnet® MS/TP, Modbus™, N2 with Mobile
0: None
1: Gas Heat, Side Penetration
2: Gas Heat, Bottom Penetration
3: Gas Heat, High Altitude Kit Natural Gas (NG),
Side Penetration
4: Gas Heat, High Altitude Kit NG, Bottom
Penetration
5: Gas Heat, High Altitude Kit Liquid Propane
(LP), Side Penetration
6: Gas Heat, High Altitude Kit LP, Bottom
Penetration
7: Gas Heat, LP Conversion Kit, Side Penetra-
tion
8: Gas Heat, LP Conversion Kit, Bottom
Penetration
Digit 37: Security Options
0: None
1: Supply and Return Opening Burglar Bars
Digit 38: Door Options
0: None
1: Viewport
2: Single Handle with Padlock
3: Single Handle with Padlock and Viewport
Digit 39: Cabinet Shipping Options
1: Single Piece Construction
Digit 40: Curb Options
A: No Roof Curb
C: Pedestal Curb
Digit 41: Pre-Evap Options
0: None
1, 2: Blank Pre-Evap Extension, No Air Blender
3, 4: Blank Pre-Evap Extension, with Air Blender
Digit 42: Shipped Loose Options
0: None
1: Spare Belts for Return/Exhaust
Digit 43: Construction Standard
0: None
Digit 44: Supply Fan VFD Frequency
A–Z: Internal Use Only
Digit 45: Supply Fan Brake
Horsepower
A–L: Internal Use Only
Digit 46: Future 3
0: None
Digit 47: Future 4
0: None
Digit 48: Testing and Special
Quotation (SQ)
0: None
T: Record Test Report
M: Mechanical Special
1: Mechanical Special and Record Test Report
S: Software Special
3: Software Special and Record Test Report
B: Mechanical and Software Special
5: Mechanical and Software Special and Record
Test Report
Digit 49: Generation/Revision Level
1: First Generation
Johnson Controls
11
5513350-JTG-1018
Selection Procedure Examples
GIVEN:
Required Cooling Capacity290,000 Btuh
Required Sensible Cooling 210,000 Btuh
Required Heating180,000 Btuh
Entering Air on Evaporator80.0°F dry bulb (DB)/
67.0°F wet bulb (WB)
Outside Design Temperature95.0°F
Supply Fan CFM12,000 CFM
2-inch Throwaway Filters
Variable Air Volume (VAV)
Calculating Cooling/Heating Capacity
1. Assume that the required cooling capacity and required sensible capacity include the space load requirements as well as the ventilation load requirements.
2. Calculate the supply fan motor heat Btuh addition.
d. Refer to Table 6 on page 28, and find the ca-
pacity of units that meet 331.0 total cooling ca-
pacity (TMBH) and 210 sensible cooling capacity
(SMBH) at 12,000 CFM, 95.0°F ambient, 80.0°F
entering dry bulb (EDB), and 67.0°F entering wet
bulb (EWB) onto the coil. A 30-ton unit can pro-
duce 362 TMBH and 287 SMBH.
e. Calculate the leaving air temperature.
1. Calculate sensible unit capacity with motor
heat included.
• Sensible Btuh = 287 MBH - 41.0 MBH
= 246.0 MBH
2. Calculate dry bulb supply air temperature
(SAT).
• Sensible Btuh = CFM x 1.085 x ∆T
• ∆T = 246,000 Btuh / (12,000 CFM x
1.085)
• ∆T = 18.9°F
• Dry bulb SAT = entering air tempera-
ture – ∆T
a. See Select Fan Speed and Horsepower Require-
ments for Supply Fan on page 13 to determine
the horsepower (HP) of the supply fan. The example is based on a 14.91 HP requirement.
b. Calculate sensible Btuh addition as a result of the
supply fan HP.
• Supply fan sensible Btuh addition = 14.91
HP x 2,750 (constant for motor heat calculation)
• Supply fan sensible Btuh addition = 41,003
Btuh
c. Calculate the total capacity requirement.
• Total capacity = required cooling capacity
(Btuh) + supply fan motor HP (Btuh)
• Total capacity = 290,000 Btuh + 41,003 Btuh
• Total capacity = 331,003 Btuh
• Dry bulb SAT = 80.0°F – 18.9°F = 61.1 °F
3. Calculate enthalpy delta.
• Total capacity Btuh = CFM x 4.5 x ∆h
• ∆h = 363,000 Btuh / (12,000 CFM x 4.5)
• ∆h = 6.7 Btu/lb
4. Calculate wet bulb SAT.
• Leaving enthalpy = enthalpy entering –
enthalpy delta (reference psychometric
chart to convert unit wet bulb temperature to Btu/lb)
• Leaving enthalpy = 31.6 Btu/lb – 6.7
Btu/lb
• Leaving enthalpy = 24.9 Btu/lb
• Wet bulb SAT = 57.7°F
5. Leaving air temperature = 61.1°F / 57.7°F
The 30 ton unit will meet the cooling requirements.
From the nomenclature, digit 3 will be B for 30 ton
capacity. Digit 4 will be 1 for standard capacity, stan-
dard efficiency as assumed.
12
Johnson Controls
5513350-JTG-1018
Selection Procedure Examples (Continued)
3. For gas heating capacity, reference Table 16 on page
57.
a. If the unit being selected will use gas heat, refer
to Table 16. Trace down to the output column.
b. Find the output that exceeds the 180,000 Btuh
requirement.
The 250 MBH output exceeds this requirement.
c. This option is available on the 30 ton unit.
From the nomenclature, select digit 5, option B for
staged gas, option C for staged gas with stainless
steel burner, or option G for modulating gas with
stainless steel burner.
From digit 6B, select option 1 for 250 MBH. The re-
sulting model number will show C1 for digits 5 and 6,
assuming staged gas with stainless steel burner was
selected.
4. For electric heating capacity, reference Table 17 on page 58.
a. If the unit being selected will use electric heat, re-
fer to Table 17. Trace down to the output column.
b. Find the output that exceeds the 180,000 Btuh
requirement at the given 460-3-60 voltage.
The 60 kW output exceeds this requirement.
c. This option is available on the 30 ton unit.
From the nomenclature, select digit 5, option M for
electric heat.
From digit 6A, select either option 1 with low staged
electric heat or option 4 with low silicon controlled
rectifier (SCR) electric heat. The resulting model
number will show M4 for digits 5 and 6, assuming
low SCR electric heat was selected.
5. For steam heating capacity for a 30 ton unit, reference
Table 22 on page 60 and Table 23 on page 61.
a. Assume the unit being selected will use a 10 psig
steam supply.
b. Find the output that exceeds the 180,000 Btuh
requirement with 12,000 CFM and 10 psig.
From the nomenclature, select digit 5, option K for
steam coil.
From digit 6C, select either option 1 for low heat without valves or option 2 for low heat with valves. The
resulting model number will show K2 for digits 5 and
6, assuming the unit is field provided with valves.
6. For hot water heating capacity for a 30 ton unit, refer-
ence Table 18 on page 58 and Table 19 on page
59.
a. Assume a hot water supply temperature of
140.0°F and 20 GPM.
b. Find the output that exceeds the 180,000 Btuh
requirement with 12,000 CFM at 140.0°F and 60
GPM.
The low heat option on Table 18 exceeds this re-
quirement.
c. This option is available on the 30 ton unit.
From the nomenclature, select digit 5, option L for hot
water coil heat.
From digit 6C, select either option 1 for low heat without valves or option 2 for low heat with valves. The
resulting model number will show L2 for digits 5 and 6,
assuming the unit is field provided with valves.
Select Fan Speed and Horsepower
Requirements for Supply Fan
1. Reference Table 27 on page 64 for the 30 ton unit.
a. Make any necessary additions to the static re-
sistance for the ductwork. Refer to Table 26 on
page 62:
+ gas heat (250 MBH)0.04 iwg
+ throwaway filters0.13 iwg
Total Static Resistance (TSP)5.50 iwg
0.09 iwg
0.69 iwg
The low heat option on Table 22 exceeds this re-
quirement.
c. This option is available on the 30 ton unit.
Johnson Controls
b. Enter Table 27 at 12,000 CFM and 5.50 iwg TSP:
RPM = 1768
BHP = 14.91
13
5513350-JTG-1018
Selection Procedure Examples (Continued)
2. From the nomenclature, select digit 15, option A to
opt for direct drive plenum (DDP) supply fan with
1-inch spring isolation. Select digit 16, option E for
20 HP supply fan motor. Select digit 17, option 2 for
ODP premium efciency, 1,800 RPM.
Select Fan Speed and Horsepower
Requirements of Exhaust Fan
1. Reference Table 29 on page 65 for the 30 ton unit. In the following example, a unit is designed for exhaust air capacity of 7,000 CFM.
a. Make any necessary additions to the static resis-
tance. To find the exhaust air damper pressure
drop, refer to Table 26 on page 62:
Return duct static pressure (assumed) 0.25 iwg
+ exhaust air damper pressure drop0.33 iwg
TSP0.58 iwg
b. Enter at 7,000 CFM and 0.58 iwg TSP:
RPM = 634 (interpolated)
BHP = 2.72 (interpolated)
2. From the nomenclature, select digit 19, option 2 for
exhaust with variable frequency drive (VFD) and
backdraft damper; digit 20, option B for the exhaust
fan with 1-inch spring isolation; and digit 21, option
E for 3 HP exhaust fan motor. The resulting model
number will show 2BE for digits 19, 20, and 21.
Select Energy Recovery Wheel (ERW)/
Hot Gas Reheat (HGRH)/Sound Attenuator/
Humidifier
Refer to Selection Navigator or contact the local sales office
for more information on available options and accessories.
Example Model Number
The following model number is an example based on the options selected in the previous sections.
G V B 1 C – 1 B 5 G A – 1 A 6 0 A – E 2 0 2 B – E 2 A D G – 2 C 0 E 0 – D M A A 3 – 1 0 0 1 A – 0 0 0 C G – 0 0 0 1
7
5
3
4
3. Capacity 30 Ton20. Forward Curved Exhaust Fan with 1-inch Spring Isolation
4. Standard Capacity, Standard Efciency21. Exhaust Fan Motor, 3 HP
5. Staged Gas Stainless Steel22. Exhaust Fan Motor Type, ODP Premium Efciency 1,800 RPM
*NOTE: Correction factors at sea level to calculate for actual tempera-
ture conditions.
The examples below will assist in determining the airflow
performance of NexusPremier™ at specific altitudes.
Example 1: What are the corrected cubic feet per minute
(CFM), static pressure, and brake horse power (BHP) at
an elevation of 5,000 feet if the airflow performance data is
6,000 CFM, 1.4 inches of water gauge (iwg), and 2.0 BHP?
Solution: At an elevation of 5,000 feet, the supply fan still
delivers 6,000 CFM if the revolutions per minute (RPM) is
unchanged. However, the altitude correction must be used
to determine the static pressure and BHP. Since no tem-
perature data is given, we assume an air temperature of
70.0°F. Table 3 shows the correction factor to be 0.832.
Corrected static pressure = 1.4 x 0.832 = 1.16 iwg
Corrected BHP = 2.0 x 0.832 = 1.66
Example 2: A system, located at 5,000 feet of elevation is
to deliver 6,000 CFM at a static pressure of 1.4 iwg. Use
the unit blower tables to select the RPM, blower speed, and
the BHP requirement.
Solution: As in the example above, no temperature information is given, so 70.0°F is assumed.
EnterTable 27 on page 64 at 6,000 CFM and static pres-
sure of 1.68 iwg. The RPM listed is the same RPM needed
at 5,000 feet.
Using interpolation, the corresponding BHP listed in the
table is 2.25. This value must be corrected for elevation.
BHP at 5,000 feet = 2.25 x 0.832 = 1.87
Example 3: Plot fan performance using Table 26 on page
62.
Plot the fan performance at cooling sea level (0 feet) elevation. Design conditions are a 25-ton unit producing 10,000
CFM at 1.5 external static pressure (ESP) with additional
static losses for a wet evaporator coil, bottom return air,
bottom supply air, outside air, and angled filter rack with
2-inch MERV 8 filters.
Wet evaporator coil standard capacity
additional static loss = 0.41 iwg
Bottom return air additional static loss = 0.05 iwg
Bottom supply air additional static loss = 0.06 iwg
Outside air additional static loss = 0.30 iwg
Air filter additional static loss = 0.11 iwg
The 1.4 iwg static pressure given is at an elevation of 5,000
feet. The first step is to convert this static pressure to equivalent sea level conditions.
In order to determine the electrical service required for the
NexusPremier™ rooftop unit, use the appropriate calculations listed below from U.L. 60335-2-40. Based on the configuration of the unit, the calculations yield different mini-
mum circuit ampacity (MCA) and maximum overcurrent
protection (MOP).
Using the following load definitions and calculations, de-
termine the correct electrical sizing for the unit. All concurrent load conditions must be considered in the calculations,
and the highest value for any combination of loads must
be used.
Load Definitions:
• LOAD1 is the current of the largest motor – compres-
sor or fan motor.
• LOAD2 is the sum of the remaining motor currents
that may run concurrently with LOAD1.
• LOAD3 is the current of the electric heaters – zero for
cooling only units.
• LOAD4 is the sum of any remaining currents greater
than or equal to 1.0 amp.
Use the following calculations to determine MCA and MOP
for units supplied with a single-point power connection:
MCA = (1.25 x Load1) + (1.25 x Load3) + Load2 + Load4
Exception: Load3 may be multiplied by 1 if the elec-
tric heater is greater than 50kW
MOP = (2.25 x Load1) + Load2 + Load3 + Load4
Use the following calculations to determine MCA and MOP
for units supplied with a dual-point power connection:
Electrical circuit 1: compressors and crankcase heaters, condenser fan motors, electric heat (MCA 1 /
MOP 1)
energy recovery wheel, 120V transformer for lights/
UV lights/convenience outlet, and 24VAC control
transformers (MCA 2 / MOP 2)
Use the formulas above to calculate MCA and MOP for
electrical circuits 1 and 2.
For single/dual point power connection, if the MOP does
not equal a standard current rating of an overcurrent pro-
tective device, then the marked maximum rating is to be
the next lower standard rating. However, if the device selected for MOP is less than the MCA, then select the lowest
standard maximum fuse size greater than or equal to the
MCA.
Fixed Speed Compressor Data
Table 33: Standard Efficiency/Standard Capacity Compressor Electrical Data
Table 34: Standard Efficiency/High Capacity Compressor Electrical Data
Nominal Voltage
ModelCompressor
1A34.0240.016.0140.012.9107.6
25
2A19.0123.09.762.07.450.0
2B27.6191.012.8101.09.678.0
1A28.2240.014.7128.011.393.7
30
1B22.4149.010.675.07.754.0
2A25.0164.012.2100.09.078.0
2B25.0164.012.2100.09.078.0
1A51.3300.022.4150.019.9109.0
40
1B25.0164.012.2100.09.078.0
2A34.0240.016.0140.012.9107.6
2B28.2240.014.7128.011.393.7
1A30.1225.016.7114.012.280.0
50
1B55.8340.026.3179.023.7132.0
2A29.5195.014.795.012.280.0
2B55.8340.026.3179.023.7132.0
208-230/3/60460/3/60575/3/60
RLALRARLALRARLALRA
Variable Speed Drive Compressor Data
Table 35: High Efficiency/Standard Capacity Compressor Electrical Data
Nominal Voltage
ModelCompressor
1, 2
VSD
25
2A19.0-123.09.7-62.07.4-50.0
2B27.6-191.012.8-101.09.6-78.0
1, 2
VSD
30
2A25.0-164.012.2-100.09.0-78.0
2B25.0-164.012.2-100.09.0-78.0
1, 2
VSD
40
1B39.1-267.018.6-142.015.4-103.0
2A27.6-203.014.1-98.011.5-84.0
2B27.6-203.014.1-98.011.5-84.0
1, 2
VSD
50
1B
2A39.1-267.018.6-142.015.4-103.0
2B39.1-267.018.6-142.015.4-103.0
208-230/3/60460/3/60575/3/60
RLAInput ALRARLAInput ALRARLAInput ALRA
-58.0--31.0--27.0-
-74.8--38.0--34.0-
-74.8--37.5--37.5-
-88.0--44.0--44.0-
41.0-304.019.2-147.016.7-122.0
NOTES:
1. Variable speed drive compressor
2. Input A supplied for maximum input current to compressor VFD
68
Johnson Controls
Electrical Data (Continued)
Power Supply Voltage Limits
Table 36: Power Supply Voltage Limits
Power SupplyMinimum VoltageMaximum Voltage
208-230V/3Ph/60Hz207253
460V/3Ph/60Hz414506
575V/3Ph/60Hz518632
Condenser Fan Motor
Table 37: Condenser Fan Motor
Each Motor
Unit SizeQuantity of Fans208-230V/3Ph/60Hz460V/3Ph/60Hz
25–30 Ton213.66.8
40–50 Ton427.213.6
5513350-JTG-1018
208-230V/3Ph/60Hz460V/3Ph/60Hz
6.83.4
Electric Heat
Table 38: Electric Heat Amp Draw
CapacityType of Heat
Low Heat
Low Heat with SCR3*
Low Heat
Low Heat with SCR3*
High Heat
25–30 Tons
High Heat with SCR6*
High Heat
High Heat with SCR6*
Low Heat
Low Heat with SCR4*
Low Heat
Low Heat with SCR4*
High Heat
40–50 Tons
High Heat with SCR8*
High Heat
High Heat with SCR8*
Nominal kW
Heater
Stage kW
5016.7
6020.0
10016.7
12020.0
6015.0
8020.0
12015.0
16020.0
Each
Steps
3
3
6
6
4
4
8
8
208-30V/3Ph/60Hz460V/3Ph/60Hz575V/3Ph/60Hz
AMPSAMPSAMPS
115.3--
-69.255.3
230.5--
-138.3110.7
138.3--
-92.273.8
276.6--
-184.4147.5
NOTES:
* Silicon Controlled Rectier (SCR) is a modulating electric heat option.
SCR electric heat is installed on the rst stage of the unit and provides modulation from 0–100%.
Johnson Controls
69
5513350-JTG-1018
Electrical Data (Continued)
Supply Fan and Return/Exhaust Fan Motor Data
Table 39: Supply Fan and Return/Exhaust Fan Motor Data - Premium Efficiency - ODP
Nominal Voltage
Motor HP
Supply Fan Motor
Fan Motor
Return/Exhaust
5146.65.3
7.520.49.78
102612.510
153817.814.2
205223.519.1
25642924.5
30763529
40994940
501215746
38.54.23.4
5146.65.3
7.520.49.78.0
102612.510.0
153817.814.2
205223.519.1
208-230/3/60460/3/60575/3/60
FLAFLAFLA
Table 40: Supply Fan and Return/Exhaust Fan Motor Data - Premium Efficiency - TEFC
Nominal Voltage
Motor HP
Supply Fan Motor
Fan Motor
Return/Exhaust
513.96.75.3
7.5209.57.6
1025.4129.6
153818.114.6
20522419.2
25643124
30783829
401024839
501225645
394.23.3
513.96.75.3
7.5209.57.6
1025.4129.6
153818.114.6
20522419.2
208-230/3/60460/3/60575/3/60
FLAFLAFLA
70
Johnson Controls
Electrical Data (Continued)
Energy Recovery Wheel (ERW) Motor Data
Table 41: Energy Recovery Wheel (ERW) Motor
ModelType
25
30
40
50
Miscellaneous Data
Low CFM ERW0.880.440.46
High CFM ERW0.880.440.46
Low CFM ERW0.880.440.46
High CFM ERW0.880.440.46
Low CFM ERW0.880.440.46
High CFM ERW2.21.10.88
Low CFM ERW0.880.440.46
High CFM ERW2.21.10.88
208-230/3/60460/3/60575/3/60
5513350-JTG-1018
Nominal Voltage
FLAFLAFLA
Table 42: Miscellaneous Data
Nominal Voltage
Description
Control Transformer 0.2 kVA-1.00.50.5
Convenience Outlet-9.04.53.5
Gas Heat (Per Module)1.84---
250 MBH1.84---
500 MBH1.84---
750 MBH3.68---
1250 MBH5.52---
Crankcase Heater 90W-0.30.20.1
Ultraviolet (UV) Lights-4.52.11.7
Unit Lights (per light)-0.050.0250.02
115/1/60230/3/60460/3/60575/3/60
AMPSAMPSAMPSAMPS
Johnson Controls
71
5513350-JTG-1018
Controls
General
The control system for the NexusPremier™ is fully selfcontained. To aid in unit setup, maintenance, and opera-
tion, the unit controller is equipped with a user interface
(UI) that has a 5 row × 35 character organic light-emitting
diode (OLED) display. The OLED display presents plain
language text in a menu-driven format to facilitate use.
The unit controller can be connected to and operated by a
building automation system (BAS). In addition, hard wired
control options to the unit controller are provided using a
BAS interface board.
The unit controller uses the latest technology and provides
complete control for the unit along with standard BACnet
MS/TP and BACnet IP, Modbus™, and N2 communications.
The unit controller also has a USB flash drive that can be
used to capture historic data on unit operation and to up-
date firmware.
Unit Mode
Changeover Sensor
The controller compares this temperature against a set-
point to determine whether to place the unit in heating,
cooling, or satisfied mode. Zone temperature or RAT—or a
BAS input—can be used as the changeover sensor.
Mandatory Sensors
The following sensors are required to make the unit operate and are included as standard on every rooftop.
• Discharge Air Temperature
• Return Air Temperature
• Outside Air Temperature
Optional Sensors
®
Depending on the application, additional sensors may be
required.
• Zone air temperature
• Zone humidity
• Enthalpy sensor (for use with economizer)
Unit Type
The controller supports two rooftop types: variable air volume (VAV) and single zone VAV (SZVAV). Both types can
be configured to operate in several different modes of occupancy, temperature control, warm-up/cool down, and automated demand response.
Occupancy Modes
Depending on the application, the controller can be in-
dexed between occupied, unoccupied, optimal start, or
coast modes of operation. These occupancy modes are ini-
tiated automatically via an internal time clock or externally
from a BAS command, hard wired input, or tenant override
via zone sensor.
Sensors
Temperature Control Sensor
The controller compares the discharge air temperature
(DAT) against a setpoint to determine the heating or cooling demand. On multi zone VAV units, the DAT setpoint can
be reset by different methods: fixed, outside air temperature
(OAT), supply fan speed, external control, zone, or return air
temperature (RAT). See also DAT Setpoint Reset on page
74.
• Dual enthalpy sensors (measures enthalpy of outdoor
air and return air; used with economizer)
• Supply duct pressure (VAV units)
• Building pressure (required for exhaust/return fan)
• Carbon dioxide (CO2) (required for demand ventilation)
• Smoke detector
Warm-up/Cool Down Methods
The warm-up/cool down feature supports four methods
of initiating the warm-up/cool down mode: occupied com-
mand, schedule, optimal start, or coast.
Occupied Command
With an occupied command, the supply fan turns ON for a
5-minute stabilization period, after which the RAT sensor
compares to the warm-up setpoint. If the value is equal to
or below the warm-up setpoint, heating is controlled to the
warm-up DAT setpoint. If the value is above the warm-up
setpoint, the control goes into occupied mode. Warm-up
stays active until the RAT sensor is above the warm-up
setpoint for 5 minutes or the early start period expires. The
control goes into occupied mode thereafter. Cool down operates opposite of warm-up, using cooling instead of heat-
ing stages.
72
Johnson Controls
5513350-JTG-1018
Controls (Continued)
Schedule
At the early start period, prior to the scheduled occupancy,
the supply fan turns ON for a 5-minute stabilization period
and the RAT control sensor compares to the warm-up setpoint. If the value is equal to or below the warm-up setpoint,
heating is controlled to the warm-up DAT setpoint. If the
value is above the warm-up setpoint, the control goes into
occupied mode. Cool down operates opposite of warm-up,
using cooling instead of heating stages.
Optimal Start
The optimal start control algorithm is a function of the differ-
ence between space temperature and occupied setpoint, the
OAT, and the amount of time prior to scheduled occupancy.
When unoccupied, the controller calculates an early start
time based on control temperature deviation from setpoint.
This ensures the space is at conditioned levels when the
occupied period starts.
Historical data determines when optimal start begins, but
the early start time can be user limited. The optimal start
time is always within the same calendar day. The warm-up
or cool down DAT setpoints function until the demand is
satisfied. The control uses the heating or cooling setpoint
to determine when the demand is satisfied. The control
goes into occupied mode thereafter.
Coast
When enabled, 2 hours (adjustable) prior to the transition
from occupied to unoccupied, the cooling/heating setpoints
begin to ramp up/down linearly at 1.0°F per hour (adjustable) towards the unoccupied cooling/heating setpoints.
During this time, the fans continue to run and the ventilation
sequence remains active.
Multiple Unit Staggered Start
Automated Demand Response Methods
The controller is capable of three automated demand response methods: demand shed, load shed, and capacity limit.
Demand Shed
This strategy operates by setting the operating cooling/
heating temperature setpoint up or down when the unit
controller receives a demand shed signal from a binary
hard wired input or BAS command. The up/down setpoint
is adjustable. The strategy also provides an adjustable rate
limit that allows the user to control the rate of change of the
temperature setpoint as it is set up and down.
Load Shed
This function shuts down all cooling and electric heat for
an adjustable time period in response to a BAS command.
Capacity Limit
This strategy operates by limiting total allowed mechanical
cooling or electric heat capacity in proportion to the value of
an analog BAS capacity limit signal (0–100%).
Supply Air System
The supply fan is used to circulate air to condition the
temperature of the space and to provide ventilation to the
space. Supply fan starts and operating hours are measured
under all operating conditions. Two user-selectable supply
air modes are available: VAV and SZVAV.
Variable Air Volume (VAV)
Duct Pressure Control
When the fan energizes, the output from the controller maintains the supply duct pressure to the duct pressure setpoint.
If the duct pressure is greater than the setpoint, the controller output decreases.
When enabled, the start-up delay utilizes the minimum OFF
time plus a delay time. This is used to prevent all units on
a site from restarting simultaneously after a power failure.
The delay time can be manually set or randomized be-
tween 0–60 seconds.
Additional functionality includes applying a start-up delay
when switching into the occupied mode. This only happens
if the supply fan command is currently OFF when the occupancy mode switches into occupied. This staggers start-
up for multiple rooftop units if all are commanded from the
same occupied command. After the timer has expires, the
rooftop unit can start.
Johnson Controls
If the duct pressure is below the setpoint, the controller output increases. If the duct pressure reaches the duct pres-
sure shutdown setpoint, the fan and all other outputs of the
unit de-energize.
Note: If the unit is in a heating mode, the unit controller continues to control duct pressure to the duct static pressure
setpoint. Therefore, in any VAV heating mode, all VAV boxes
must be commanded open, to maximum flow, in order to get
adequate airflow to support the heating function and to prevent the heat section high temperature limit switches from
opening.
73
5513350-JTG-1018
Controls (Continued)
DAT Setpoint Reset
The DAT setpoint reset feature provides six different methods of varying the DAT setpoint: fixed, OAT, RAT, zone temperature, supply fan speed, and external control.
Fixed - The DAT setpoint is a fixed value and does
not change in response to another signal. It can be
user adjusted from the default value over a BAS or
local UI.
OAT - The DAT setpoint resets from DAT low setpoint
to the DAT high setpoint as the OAT varies from OAT
setpoint for low DAT to the OAT setpoint for high DAT.
RAT - The DAT setpoint resets from DAT low setpoint
to the DAT high setpoint as the RAT varies from the
RAT setpoint for low DAT to the RAT setpoint for high
DAT.
Zone Temperature - The DAT setpoint resets from
DAT low setpoint to the DAT high setpoint as the zone
temperature varies from the setpoint for low DAT to the
setpoint for high DAT. If zone temperature becomes
unreliable, the unit reverts to DAT reset from RAT.
Supply Fan Speed - The DAT setpoint resets from
DAT low setpoint to the DAT high setpoint as the fan
speed varies from the fan speed setpoint for low DAT
to the fan speed setpoint for high DAT.
External Control - The DAT setpoint is controlled di-
rectly by a third party (BAS communication or voltage
signal). The hard wired DAT setpoint varies from DAT
low setpoint to DAT high setpoint as the input varies
from low value to high value.
Single Zone Variable Air Volume (SZVAV)
Mechanical Cooling
Zone Temperature Control - The DAT setpoint re-
sets between low and high cooling setpoints based
on the zone cooling demand. The unit controls the
DAT by staging or modulating the compressors. The
supply fan runs at the minimum speed setpoint (adjustable).
Staged Temperature Control - The unit can be
controlled by a standard two-stage cooling/heating
thermostat. Thermostat connections are hard wired
through BAS interface board: G, Y1, Y2, W1, W2.
Thermostat commands can also be communicated
by the BAS. The fan operates at minimum or maximum speed in occupied/unoccupied mode based on
the thermostat input.
Economizer
When free cooling is available, the outside air (OA) damper
modulates to maintain the mixed air temperature (MAT) at
the DAT setpoint. During the free cooling mode, if the OA
damper modulates to 100% open and cannot maintain the
DAT setpoint, the compressors energize to maintain the
DAT setpoint.
If the zone temperature exceeds the zone temperature setpoint, the OA damper is 100% open, and all cooling stages
are staged ON (or locked out due to compressor lockout),
then the supply fan speed shall modulate to maintain zone
temperature setpoint.
Satised
If the occupancy mode is occupied without a heating or
cooling demand, the supply fan runs at the minimum fan
speed.
Modulated Heating
The DAT setpoint resets between low and high heating setpoints based on the zone heating demand. The unit con-
trols the DAT by modulating the heat (electric, gas, or hydronic). The supply fan runs at the minimum speed setpoint
(adjustable).
As the zone heating demand increases and the DAT controls to the high heating setpoint, the supply fan speed set-
point resets between heating minimum speed and 100% to
maintain the zone temperature setpoint.
Staged Heating
The DAT setpoint resets between low and high heating setpoints based on the zone heating demand. The unit controls the DAT by staging the heat (electric or gas). The supply fan runs at maximum capacity.
As the zone cooling demand increases and the DAT
controls to the low cooling setpoint, the supply fan
speed setpoint resets between minimum cooling
speed and 100% to maintain the zone temperature
setpoint.
74
Unoccupied Mode
If the occupancy mode is unoccupied, the unit does not
operate in SZVAV mode but instead operates in to the following manner:
Johnson Controls
5513350-JTG-1018
Controls (Continued)
• If the unit is congured for unoccupied operation, the
application controls to the unoccupied zone cooling or
heating setpoint.
• If cooling is needed, the DAT setpoint sets to the low
cooling setpoint. The unit controls the DAT by staging
or modulating the compressors. The supply fan runs
at maximum capacity.
• If heating is needed, the DAT setpoint sets to the high
heating setpoint.
• If modulated heating is installed, the supply fan
runs at maximum capacity. The unit controls the
DAT by modulating the heat (electric, gas, or hydronic).
• If staged heat is installed, the supply fan runs at
maximum capacity. The unit controls the DAT by
staging the heat (electric or gas).
Exhaust Air (EA) System
To control building pressure, three user selectable power
exhaust control options are available: modulating exhaust
fan, modulating EA damper with fan, and external control.
If the EA damper is more than 10% open (adjustable), the
controller energizes the exhaust fan. If the EA damper is less
than 5% open (adjustable), the controller de-energizes the
exhaust fan. To reduce fan cycling, a minimum deadband
shall be enforced between the fan start and fan stop setpoints.
External Control
Exhaust fan speed or EA damper position is controlled di-
rectly by a third party (BAS communication or voltage signal).
Return Air (RA) System
Two user selectable return fan control options are available: return fan discharge pressure and supply fan airflow
tracking.
In either return fan mode, the controller modulates the
opening of the EA damper to maintain the building pressure
at setpoint. If the building pressure is above the building
pressure setpoint, the EA damper output increases to open
the EA damper. If the building pressure is below the building pressure setpoint, the EA damper output decreases to
close the EA damper. In this mode, the EA damper position
can alternatively be controlled directly by a third party (BAS
communication or voltage signal).
Modulating Exhaust Fan (Variable Frequency
Drive (VFD))
If the building pressure is greater than the building pressure setpoint, the exhaust fan analog output increases. If
the building pressure is less than the building pressure setpoint, the exhaust fan analog output decreases.
The exhaust fan binary output energizes any time the ana-
log output is greater than 10% (adjustable) of the full volt-
age range. The exhaust fan binary output de-energizes any
time the exhaust fan analog output is less than or equal
to 5% (adjustable) of the full range. A minimum deadband
between the ON and OFF setpoints is enforced.
Modulating EA Damper with Fan (ON/OFF)
The controller modulates the opening of the EA damper to
maintain the building pressure setpoint. If the building pressure is greater than the building pressure setpoint, the EA
damper output increases to open the EA damper. If the
building pressure is less than the building pressure setpoint,
the EA damper output decreases to close the EA damper.
Return Fan Discharge Pressure
The controller modulates the speed of the return fan to
maintain the return fan discharge pressure to a setpoint.
As the supply fan speed increases or the RA/EA dampers
open, the return fan discharge pressure drops, and the fan
speed increases to maintain the pressure setpoint. As the
supply fan speed decreases or the RA/EA dampers close,
the return fan discharge pressure rises and the fan speed
decreases to maintain the pressure setpoint. The pressure
setpoint is reset based on OA damper position and supply
fan speed.
Supply Fan Airflow Tracking
When equipped with optional supply and return fan airflow measuring stations, the controller monitors the supply
fan airflow and modulates the speed of the return fan to
a return airflow setpoint. The return airflow setpoint continuously updates to match the supply fan airflow, minus a
return airflow differential (adjustable).
Johnson Controls
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Controls (Continued)
Cooling System
The controller supports both staged and variable speed di-
rect expansion (DX) cooling.
DX Cooling
Capacity Control
Constant speed compressors stage up or down to control
the DAT to setpoint. During dehumidification control, the
compressors switch to evaporator temperature control.
When equipped with a variable speed drive compressor,
the capacity modulates via vernier control. The first stage
on refrigeration circuit one is variable speed, while all other
stages are constant speed. Start count equalization does
not apply to the variable speed compressor. The variable
speed compressor is always the first compressor ON and
last compressor OFF.
Compressor Staging Algorithm
The controller employs patented algorithms to sequence the
compressor stages as a method of quickly meeting cooling
demand while reducing overshoot as temperature reaches
setpoint.
The controller excludes staging combinations that result in
one refrigeration circuit having two or more compressors energized than the other refrigeration circuit.
Rapid Start
To shorten the time it takes to get compressors running,
the optimum stage up algorithm is used. It estimates the
number of compressor steps required to meet the initial
cooling demand and quickly starts the appropriate number
of compressors. When the unit first starts up or after an
unoccupied to occupied transition, if there are no compressors running and the economizer is not suitable, rapid start
is active for the first 5 minutes of cooling operation. During
rapid start, the inter-stage delay time between compressors reduces to 15 seconds.
Variable Speed Drive Compressors
Envelope control keeps the variable speed drive compressor within the allowable range of operating conditions for
the compressor at the superheat and sub-cooling values
defined on the envelope. Oil management algorithms are
designed to keep the oil level above the minimum on variable speed drive compressors. Overall cooling demand, oil
management, saturated DAT, and saturated suction tem-
perature all influence the allowable operational speed of
the variable speed drive compressor. The controller monitors each of those requirements to provide the appropriate
minimum and maximum speeds to the compressor.
Condensate Overow Alarm
When the condensate overflow switch alarm is ON, the unit
disables mechanical cooling. Supply fan operation remains
enabled during this period. The alarm must be manually
reset at the controller.
Condenser System
The rooftop unit condenser fan control is designed to control staged and modulating condenser fans based on the
saturated liquid line temperature. Constant speed con-
denser fans are staged up or down based on the saturated
liquid line temperature. Condenser fan start count equalization is used for fixed speed fans.
Saturated Liquid Line Temperature Control
After a stabilization period of 60 seconds during saturated
liquid temperature control and after the first compressor
is energized, condenser fans are staged ON or OFF to
achieve stage up or down setpoint. If saturated liquid line
temperature is above the stage up setpoint, an additional
condenser fan is energized. If saturated liquid line temper-
ature falls below the stage down setpoint, a condenser fan
is de-energized (see Figure 10).
The variable speed fan is the first ON and the last OFF
when optionally equipped on the unit. The variable speed
fan modulates condenser fan speed between 80.0–110.0°F.
If saturated liquid line temperature becomes unreliable, the
unit reverts to fail-safe mode.
Critical High
Setpoint
Stage Up
Setpoint
Normal Operation
(deadband region)
Stage Down
Setpoint
Critical Low
Saturated Liquid Line Temperature
Figure 10: Saturated Liquid Line Temperature Control
Setpoint
LD26894
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Controls (Continued)
Fail-Safe Mode
In fail-safe mode, compressor operation maybe limited be-
low a user selected ambient temperature. Condenser fan
operation is controlled by ambient temperature and compressor operation. If the saturated liquid line temperature is
not reliable, one condenser fan is energized for every compressor that energizes, and the variable speed condenser
fan runs at 100%.
When the saturated liquid line temperature becomes reliable, the unit reverts to saturated liquid line temperature
control.
Low Ambient Mode
This functionality is only available during saturated liquid
line temperature control.
When low ambient mode is NOT enabled on a circuit, the
lower range of the OAT cooling enable setpoint is 45.0°F.
When low ambient mode IS enabled on a circuit, the lower
range of the OAT cooling enable setpoint is -10.0°F.
Low ambient mode cannot be enabled on a circuit unless
there is a variable speed condenser fan and liquid line
pressure sensor installed on that circuit.
Heating System
Run Time Equalization
The controller records the number of starts and run time
statistics for each stage of electric heat.
At the initiation of each heating demand, the stage with
the lowest total run time energizes first. When run time is
equal, the staging shall be in numerical order. The stage
with the next lowest total run time energizes next and so
on. At the termination of heating demand, the stages with
the highest run time stage OFF in reverse order. Run time
equalization only applies to equally sized, non-modulating
heating stages.
Gas Heating
The application supports up to six stages in three furnace
modules. The concept behind the staged and modulating fur-
nace options is to offer multiple furnace modules, with each
module being its own self-contained, fully functioning furnace.
Staged Gas Heat
If the DAT is lower than the heating setpoint minus the deadband, the staged heating demand increases. If the DAT is
greater than the heating setpoint plus the deadband, the
staged heating demand decreases. The gas heat modules
are energized in response to the heating demand. Each gas
heat module has a low fire and a high fire mode, which are
individually energized in response to the heating demand.
Low fire is always energized prior to high fire.
The controller supports multiple heating types including
electric heat (staged, modulated), gas heat (staged, modulated), and a hydronic heating coil. The supported heatingrelated features include warm-up, discharge air (DA) tem-
pering, load shedding, and run time equalization.
Electric Heat
The application supports up to eight stages of electric heat
as well as modulated electric heat.
Staged Electric Heat
If the DAT is lower than the heating setpoint minus the
deadband, stages are energized. If the DAT is greater than
the heating setpoint plus the deadband, the stages are deenergized.
Modulating Electric Heat
If the DAT is lower than the heating setpoint, the heating
demand increases. If the DAT is greater than the heating
setpoint, the heating demand decreases.
Modulating Gas Heat
To accomplish this, one furnace module is adapted for
modulation. The selected furnace module is started and
modulated, while the other ON/OFF furnace modules are
staged, which allows a much broader modulation range.
If the DAT is lower than the heating setpoint, the heating
demand increases. If the DAT is greater than the heating
setpoint, the heating demand decreases. Each gas heat
module has a low fire and a high fire mode, which are individually energized in response to the heating demand. Low
fire is always energized prior to high fire.
Modulating Hydronic Heating Coil
If the DAT is lower than the heating setpoint, the percent
command increases. If the DAT is greater than the heating
setpoint, the percent command decreases. The application
setup of either direct or reverse action allows support for
either normally open or normally closed valves.
Johnson Controls
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5513350-JTG-1018
Controls (Continued)
Freezestat Alarm
The application supports a freezestat input that normally has
24 VAC on the terminal. When 24 VAC is not present and
• the OAT is greater than 40.0°F (adjustable), no action
is taken and the unit operates normally.
• the OAT is 40.0°F or less (adjustable), the hot water
valve opens 100%, the supply fan de-energizes, the
economizer OA damper fully closes, and all other fans
de-energize.
The control returns to normal if either
• 24 VAC is present on the terminal or
• the OAT rises above 40.0°F (adjustable).
Discharge Air Tempering
To enable discharge air tempering, the unit must be in cool-
ing mode when the OAT being brought in to ventilate the
space is below the cooling setpoint, and air must be heated
to prevent low temperature air from being delivered to the
space. Discharge air tempering is available on both staged
and modulated heating types. The compressors cannot
start when discharge air tempering is active.
Economizer
When the economizer is installed, economizer suitability is
true, and there is a call for cooling, then the controller mod-
ulates the OA damper between the minimum position and
100% to maintain the MAT to the DAT setpoint. Economizer
suitability is determined based on the changeover option
selected and the available sensors. If the economizer is
unable to meet cooling demand after the OA damper has
been 100% open for a period of time, the unit controller al-
lows mechanical cooling to operate.
Changeover Method
The unit can be equipped with one of three types of optional economizers: dry bulb, single enthalpy, or dual enthalpy.
When the economizer selection variable is set to auto (default), the unit controller selects which economizer method
to use based on which temperature and humidity sensors
are present and reliable (see Table 43).
Table 43: Free Cooling Sensor Requirements
OATOAHRATRAH
Dry BulbX
Single EnthalpyXX
Dual EnthalpyXXXX
The order of economizer selection is dual enthalpy (all sensors reliable), single enthalpy (only OA sensors reliable),
and dry bulb (only OAT sensor). The user can also manually select the economizer type when all required sensors
are available. If economizer cooling alone is insufficient for
the cooling load, the controller stages up compressors, one
at a time, to meet demand.
Dry Bulb
With the dry bulb economizer, the controller monitors the
OAT only and compares it to a reference temperature set-
ting. Outside air is deemed suitable for economizing when
the OAT is less than the reference temperature setting.
This method of economizing is effective, but it is prone to
some changeover inefficiencies since it is based on sensible temperatures only and does not take outside air moisture content into consideration.
Single Enthalpy
With the optional single enthalpy economizer, the controller monitors the OA enthalpy in addition to the OAT and
compares it to a reference enthalpy setting and a reference temperature setting. Outside air is deemed suitable
for economizing when the OA enthalpy is determined to
be less than the reference enthalpy setting and the OAT is
less than the reference temperature setting. This method
of economizing allows the reference temperature setting to
be set higher than the dry bulb economizer and is consequently a more efficient rooftop economizer.
Dual Enthalpy
With the optional dual enthalpy economizer, the controller
monitors and compares the OA and RA enthalpies in addition to comparing the OAT to the reference temperature
setting. Outside air is deemed suitable for economizing
when the OA enthalpy is determined to be less than the RA
enthalpy and the OAT is less than the reference temperature setting. This method of economizing is the most accurate and provides the highest degree of energy efficiency
for a rooftop economizer.
Auto
Auto selects the changeover method based on which sensors are present and reliable. If the OAT, RAT, OA humidity, and RA humidity values are reliable, then the dual enthalpy changeover method is used. If either of the RAT or
RA humidity sensors is unreliable, then the single enthalpy
changeover method is used. If the OA humidity sensor is
unreliable, then the dry bulb changeover method is used.
Economizer - Damper Not ModulatingEconomizer damper actuator is inoperable or not responding to commands.
Economizer - Not Econ When Available
Economizer - Econ When Not Available
Economizer - Excess Outside AirEconomizer damper is open greater than commanded position.
Conditions are available for economizer operation but the unit does not use outside
air for cooling.
Conditions are not available for economizer operation but the unit uses outside air for
cooling.
Fault Detection and Diagnostics (FDD)
As required per 2016 California Title 24 and ASHRAE 90.12016, the fault detection and diagnostics (FDD) system provides the alarms stated in Table 44.
Energy Recovery Wheel (ERW)
The energy recovery wheel (ERW) can run in both cooling
and heating modes. In cooling mode, if the conditions are
suitable for economizing, the ERW disables, and the bypass dampers fully open.
The ERW enables when the absolute value of the difference between the return air and the outside air is greater
than the energy recovery setpoint. If the OA and RA humid-
ity values are reliable, then enthalpy is compared; otherwise dry bulb temperature is compared.
When the ERW stops for extended periods, it energizes
briefly for cleaning and blocking protection.
Single Speed ERW
When enabled, the ERW runs at full speed and the ERW
bypass dampers fully close. When the exhaust air tem-
perature (EAT) drops below the energy recovery low limit
setpoint, the ERW bypass dampers fully open to bypass
the ERW.
Ventilation
Minimum OA Damper Reset
Fixed Minimum
When the control is in the occupied mode and the fan output energizes, the OA damper is positioned to the minimum
position setpoint (adjustable) unless another function commands it open or closed. When the control is in the unoccupied mode, the minimum OA position is zero.
Supply Fan Speed
When the control is in the occupied mode, the fan output
energizes, and the output reaches 100%, the OA damper
position is the damper_min_pos_high_speed_fan setpoint.
When the VFD output reaches 50% (adjustable) or less,
the OA damper position is the damper_min_pos_low_
speed_fan setpoint.
When the VFD output is between 50–100% (adjustable),
the OA damper positions proportionally between damper_
min_pos_high_speed_fan setpoint and damper_min_pos_
low_speed_fan setpoint.
Note: Supply fan speed minimum OA damper reset is not
available when demand control ventilation (DCV) is enabled.
Variable Speed ERW
When enabled, the ERW runs at full speed and the ERW
bypass dampers fully close. When the EAT drops below
the energy recovery low limit setpoint, the ERW slows to
maintain a minimum EAT to prevent freezing. If the minimum speed does not maintain the temperature setpoint,
the bypass dampers fully open to bypass the ERW.
Johnson Controls
Outside Airow Measurement
This control sequence provides for the dynamic determination of the minimum damper position that meets the
ASHRAE building ventilation standards. If the outside air-
flow input is not reliable, then the damper is positioned
based upon the default minimum position.
When the fresh air intake value falls below the fresh air intake setpoint, the OA damper position increases above its
minimum position until the fresh air intake value equals the
fresh air intake setpoint.
79
5513350-JTG-1018
Controls (Continued)
When the fresh air intake value rises above the fresh air
intake setpoint, the OA damper position decreases until the
fresh air intake value equals the fresh air intake setpoint or
it reaches minimum position setpoint.
When DCV is enabled on a unit with an outdoor airflow measurement station installed, the fresh air intake setpoint resets
upwards until the CO2 level falls below the DCV setpoint.
Note: The low ambient minimum position may force the
damper position below the current setpoint and disable the
air monitoring station reset.
External Control
The OA damper is controlled directly by a third party (BAS
communication or voltage signal). External control takes
priority over all other damper control except unit protection.
Low MAT Limiting
When the control is in the occupied mode, the economizer
is not active, the fan output is energized, and MAT is below
the MAT cooling limit, the damper begins closing. When the
MAT is equal to or above the MAT cooling limit, it exits the
low MAT limiting mode.
Demand Control Ventilation (DCV)
If optional CO2 sensors are connected to the unit, the controller can reset the minimum OA damper position based on
demand. The controller has built-in sequences for indoor CO2
and comparative CO2. Demand ventilation remains active as
long as the unit is in the occupied mode of operation.
Indoor CO
The controller monitors the CO2 level within the building.
If the CO2 level rises above the CO2 setpoint, the controller temporarily increases the minimum OA damper position
or minimum outside airflow rate to increase ventilation. If
the CO2 level drops below the CO2 setpoint, the controller
decreases the minimum OA damper position or minimum
outside airflow rate to decrease ventilation.
Comparative CO
If differential DCV is enabled and the outdoor air CO2 level
is greater than or equal to the indoor air CO2 level by more
than the demand ventilation differential setpoint, then the
OA damper is overridden closed regardless of economizer
suitability. Otherwise, the indoor CO2 sequence is followed.
2
2
Pre-Occupancy Purge
When the unit is in internal schedule, if pre-occupancy
purge is enabled, effective occupancy is unoccupied, the
MAT reading is reliable, and the damper is not controlled
by higher-priority logic, then pre-occupancy purge mode
initiates immediately when the time until occupancy equals
the pre-occupancy purge time. Pre-occupancy purge runs
until the pre-occupancy purge timer expires or if any of the
entry conditions required for pre-occupancy purge mode
are violated.
Once in pre-occupancy purge mode, the VAV heat command relay turns ON and the system continues to moni-
tor the MAT. When the MAT falls below the DAT low limit
(purge DAT low), the system begins modulating the OA
damper to temper the outside air until the MAT rises above
the DAT low limit. If while doing so, the damper fully opens
and remains fully open during the damper control satura-
tion period (damper control status = high) while the MAT
holds above the DAT low limit, the system resumes regular
pre-occupancy purge mode (purge).
Likewise, if while in pre-occupancy purge mode, the MAT
exceeds the DAT high limit (purge DAT high), the system
modulates the OA damper to reduce the MAT to below the
DAT high limit. If the OA damper opens and remains fully
open during the damper control saturation period (damper
control status = high) while the MAT is held steadily below
the DAT high limit, the system returns to regular, pre-occu-
pancy purge mode (purge).
If using an indoor CO2 sensor and low CO2 control point is
satisfied, then the mode terminates.
Continuous Ventilation
When enabled, the supply fan runs continuously during oc-
cupied mode, even when no heating or cooling is required.
When continuous ventilation is disabled, the supply fan
cycles OFF when no heating or cooling is required.
Smoke Control
If smoke control mode is in one of its active modes, the OA
damper sets to 0% or 100%. If smoke control mode is in
purge or pressurization mode, the OA damper is 100%. If
smoke control mode is in de-pressurization, the OA damper is 0%.
The smoke control sequences are used whenever the
smoke control binary inputs turn ON. It should be noted
that the smoke control sequences are not normal operation
for rooftop units and are only utilized when smoke or other
airborne contaminants must be quickly removed from the
conditioned space.
80
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5513350-JTG-1018
Controls (Continued)
Whenever a smoke control sequence starts, all normal
heating and cooling functions stop regardless of the control
inputs. This includes all running compressors, condenser
fans, heat stages, heating valves, and furnaces.
There are three smoke control binary inputs available on
the BAS Interface board. Each input is assigned one of the
three sequences. This makes it possible to start and stop
any of the three sequences at any time because there are
three inputs available for the three sequences. To avoid
problems when more than one input is active at the same
time, each input has a priority. The sequence assigned to
the active input with the highest priority is used over sequences assigned to inputs with a lower priority.
When either one of the smoke control mode 1, 2, or 3 is
ON, the smoke control mode is assigned one of the follow-
ing states according to the binary input priorities and the
sequence settings:
Depressurize
The depressurize mode evacuates (negatively pressurizes) the building or space to draw air through the walls from
adjacent spaces or outside the building envelope. When
this sequence starts, the following occurs:
• Sets exhaust/return fan VFD to 0%.
• Sets OA damper position to 100%.
• Sets RA damper position to 0%.
• Sets EA damper position to 0%.
Purge
The purge mode displaces the air inside the space with
fresh outside air. When this sequence starts, the following
occurs:
• Sets supply fan output to ON.
• If the unit type is VAV, the supply fan VFD speed maintains the active duct pressure setpoint and the VAV
heat command relay turns ON.
• If unit type is SZVAV, it sets the supply fan VFD speed
to 100%.
• Starts the return fan (exhaust fan output) if not already
ON.
• Sets exhaust/return fan VFD to 100%.
• Sets OA damper position to 100%.
• Sets RA damper position to 0%.
• Sets the supply fan output to OFF.
• Starts the return fan (exhaust fan output) if not already
ON.
• Sets exhaust/return fan VFD to 100%.
• Sets OA damper position to 0%.
• Sets RA damper position to 100%.
• Sets EA damper position to 100%.
Pressurization
The pressurization mode pressurizes the building or space
to force the air inside the space through the walls to adjacent spaces or outside the building envelope. When this
sequence starts, the following occurs:
• Sets supply fan output to ON.
• If the unit type is VAV, the supply fan VFD speed maintains the active duct pressure setpoint and the VAV
heat command relay turns ON.
• If the unit type is SZVAV, it sets the supply fan VFD
speed to 100%.
• Sets exhaust fan output to OFF.
• Sets return fan output to OFF.
• Sets EA damper position to 100%.
Humidity Control
Humidity Sensor
The controller compares the humidity against a setpoint to
determine whether to place the unit in dehumidification, humidification, or temperature control only mode. Selectable
humidity sensors are zone, return, or external control.
Dehumidification
Modulating Hot Gas Reheat (HGRH)
If the humidity sensor rises above the dehumidification set-
point while the unit is in cooling or satisfied mode and the
OAT is greater than 55.0°F, the unit enters dehumidification
mode. The dehumidification devices are sequenced so that
the compressors are controlled based on humidity and the
reheat device is controlled based on temperature.
When dehumidification with HGRH is active, the staging of
compressors are controlled so that the air leaving the evaporator coil is controlled to an evaporator temperature set-
point. This ensures that water condenses and is removed
from the air. The HGRH valve is then modulated so that it
warms the air to a DAT setpoint.
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Controls (Continued)
While the system is in mechanical cooling, the HGRH valve
is controlled to the effective DAT setpoint. This is necessary because the compressors may be controlled to a temperature lower than the effective cooling DAT setpoint to remove additional moisture content from the air. This strategy
allows humidity to be removed from the air while attempting
to maintain normal cooling DATs.
While the system is idle, the HGRH valve is controlled so
that the DAT setpoint resets between the effective cooling
DAT setpoint and the RAT. This strategy allows humidity to
be removed from the air while attempting to keep the DAT
warm enough so that the system does not enter heating
mode.
The controller uses the humidity sensor as the basis for
the evaporator temperature setpoint. When the RA humidity first rises above setpoint, the evaporator temperature
setpoint is the same as the low cooling DAT setpoint. As
humidity continues to rise, the evaporator temperature set-
point lowers to remove additional moisture from the air.
If the changeover sensor calls for heating or the OAT falls
below 54.0°F, dehumidification mode ends regardless of
humidity.
HGRH Bleed Valve
The HGRH bleed valve is a solenoid valve that connects
the HGRH coil to the suction line. The purpose of the
HGRH bleed valve is to bleed off any remaining or trapped
liquid in the HGRH coil when dehumidification mode is not
active. When the unit enters dehumidification mode, the
HGRH bleed valve closes. When the unit exits dehumidification mode and after a 5-minute delay, the HGRH bleed
valve opens.
ing load. All twinned units operate concurrently and are not
sequenced based on the cooling or heating load. It allows
for the user to design the system in an N+1 arrangement, in
which three units are sized to handle the load and the fourth
is available as a backup. The user is then able to shut down
one of the running units and enable the backup via the BAS.
Each rooftop unit requires an isolation damper with an end
switch to ensure the damper is fully open before the supply
fan can start. Each rooftop unit in a twinning application
also requires its own duct static pressure sensor to allow
the rooftop units to run independently if one or more units
are shut down for maintenance or BAS communication
is lost. Each unit has a manual reset high duct pressure
switch installed to prevent over pressurization of the duct.
In a twinning system, several features are synchronized
while others can operate independently. The method used
to synchronize these features is for each twinned unit in the
group to broadcast the key values so it can be used by the
other rooftop units in the group. The approach is referred to
as independent twinning.
The idea is that if each unit has the exact same values,
then each rooftop unit can execute the exact same control
algorithm. This has the advantage of being more robust to
communication errors or sensor failures and less complex
than a master and dependent unit arrangement. If one unit
fails or is manually shut down, the remaining units continue
to run without interruption. In the master and dependent
unit arrangement, if the master unit disables, the failover
logic to a different master is more complicated and may
result in a disruption in the system. Independent twinning
prevents such disruptions or failures in the system.
The synchronized features include supply fan control,
economizer suitability, occupancy, demand control ventila-
tion, exhaust fan control, and smoke control.
Humidification Output
If the humidity sensor falls below the humidification setpoint
and the unit is not in cooling mode, the unit is placed in humidification mode. The humidifier or steam valve enables
and modulates to maintain the humidity setpoint as sensed
by the humidity sensor. The humidity high limit overrides
the output if necessary to prevent the DA humidity from exceeding the DA humidity high limit setpoint. Humidification
is not allowed in cooling mode.
Twinning
The application of having two or more separate rooftop units
tied into one common main duct trunk line is known as twinning. The application is compatible with BACnet. The twinning process allows for redundancy with the cooling/heat-
82
The supply fan control must be synchronized to maintain
DA static pressure between all units serving the same duct.
This requires all reliable DA static pressure values from the
rooftop units to be averaged before passing to the propor-
tional-integral-derivative (PID). The static pressure setpoint
must also be synchronized, and any change to one setpoint
must be shared with the other rooftop units. This allows the
PID in each rooftop unit to calculate the same output value
and run all the supply fans at the same speed.
During start-up of a previously shutdown rooftop unit, the
supply fan speed slowly ramps up until it matches the fan
speeds of the rooftop units currently in operation. When the
additional rooftop unit begins ramping, the static pressure
increases, causing the other rooftop unit fans speeds to slow
down to reach setpoint. Once the rooftop unit fan speed
matches the existing rooftop units, it releases into control.
Johnson Controls
5513350-JTG-1018
Controls (Continued)
The economizer suitability should also be synchronized to
allow all the units to use the OA damper for free cooling
when available. This also avoids a situation where one unit
is operating in economizer mode while another unit operates
in mechanical cooling mode.
The occupancy for the twinned units must also be synchronized to allow all units to switch between occupied and unoc-
cupied modes simultaneously. This includes the occupancy
schedule and warm-up/cool down if enabled.
The DCV is synchronized to allow the OA damper minimum
position to be reset equally between the units. This requires
the indoor CO
maximum to be passed to the reset logic to ensure sufficient
outside air is brought in for proper ventilation. The indoor
CO2 setpoint also synchronizes so the reset calculation is
the same across all units.
The exhaust fan system must be synchronized to allow for
proper building pressurization. This requires the building
static pressure values from each unit to be averaged before passing to the PID. The building static pressure setpoint
also synchronizes, and any change to one setpoint must be
shared with the other rooftop units.
The smoke control feature is synchronized to ensure all
units properly switch between the purge, pressurization,
or depressurization modes. This requires the three smoke
control binary inputs and their priorities on each unit to be
shared so if any binary input is ON, all twinned units respond
the same way.
The temperature control, return fan systems, and safety
shutdowns can operate individually on each unit. The temperature setpoints synchronize to allow for similar operation
between the units. The temperature loops are not required
to be as tightly coupled as the supply and exhaust fan systems.
The twinning feature also has the following additional requirements:
• BAS interface board required for twinning application
• VAV system types only
• All units must be the same size
• Fan systems have tuning disabled
• External control not supported
• The same static pressure probe can be connected to
all discharge pressure transducers
values from the units to be shared and the
2
Unit Protection
The unit utilizes several system safeties to ensure unit pro-
tection, including low voltage, compressor system status
monitoring, low and high pressure cutout monitoring, suc-
tion temperature monitoring, freeze protection, fan over-
load, shutdown, furnace limit, and MAT low limit.
Conditions that cause the unit to be locked out require user
intervention. Refrigeration fault lockouts cannot be reset
from the BAS. All other fault lockouts can be reset from
network input or local UI.
Unit Shutdown
Any time the normally closed contact opens, all relay out-
puts immediately de-energize and the unit shuts down. An
alarm generates and displays on the unit controller.
Unit Test
Start-Up Wizard
Field service technicians use the start-up wizard function to
complete the unit configuration and start-up. It is a sequence
of automatic self-tests and manually verified tests that are
required for start-up documentation. For each test, a PASS/
FAIL, date/time stamp, and relevant system data are record-
ed. After the testing sequence completes, a report with the
recorded results is stored and downloadable via USB.
Air Balancing Wizard
The air balancing wizard is a grouping of configuration
screens used for testing and calibrating airflow measur-
ing stations, overriding damper positions, overriding fan
speeds, and other functions to assist service technicians
and air balancers.
Commissioning Mode
Commissioning mode is a function used for manually operating the unit during a service call or commissioning dem-
onstration. It allows for the unit components to be operated
individually. The unit must not be operated in this mode for
an extended period, therefore commissioning mode terminates automatically after 60 minutes unless extended at
the local UI for another 60 minutes.
Cooling and heating is disabled unless the supply fan status is proven. Unit protection and safeties remain active
and logged during commissioning mode.
• The same static pressure probe can be connected to
all building pressure transducers
Johnson Controls
83
5513350-JTG-1018
Weights and Dimensions
Weights
Economizer Cabinet with or
without Energy Wheel Cabinet
Draw-Thru
Filter Cabinet
Pre-Evaporator Blank Cabinet, Air Blender Cabinet
(Between Economizer and Draw-Thru Filter)
Figure 11: Standard Cabinet Unit Sections
Evaporator Cabinet
Supply Fan Cabinet
Post-Evaporator Blank Cabinet, Discharge Plenum
Heat and Discharge
Cabinet
4
Small Post-Evaporator Blank Cabinet, Large
Cabinet (Upstream of Condenser Section)
LD26900
Table 45: Weight Data
Model25304050
Base Unit Section Weights - Standard Cabinet (See Figure 13)
MERV 15 Bag Filters with 2-Inch Pre Filters199199258258
MERV 14 Rigid Filters with 2-Inch Pre Filters326326436436
MERV 17 HEPA Filters with 2-Inch Pre Filters424424567567
Gas Heat (Stage or Modulating) (Aluminized or Stainless Steel)
250 MBH260260--
500 MBH381381400400
750 MBH571571590590
1250 MBH--901901
Electric Heat
Electric Heat
Hot Water Heat
Low Heat with Valves202202224224
High Heat with Valves241241267267
Steam Heat
Low Heat with Valves223223234234
High Heat with Valves238238250250
Refrigeration System
Standard Efciency Cooling System1754201426182753
High Capacity Cooling System1814208728373104
High Efciency Cooling System1850204426232945
Hot Gas Reheat (HGRH) Coil35354444
Louver Hail Guard293293427427
Miscellaneous Options
Humidier185185205205
Air Blender8484132132
Ultraviolet (UV) Lights65656565
Sound Attenuator532532661661
Lights 21212121
Smoke Detector5555
Transformer
11
12
355355473473
60606060
86
Johnson Controls
5513350-JTG-1018
Weights and Dimensions (Continued)
NOTES:
1. Economizer cabinet weight must be included in all units.
2. Pre-evaporator blank can be a blank section or include an air blender.
3. Heat section cabinet option for any of the following:
a. Top or right discharge
b. and/or discharge filters, humidifier or sound attenuator, or blank post-evaporator section
c. Requires discharge plenum. Discharge can be bottom, left, right, or top.
4. Heat and discharge through heat option is used unless any of the following are included:
a. Discharge filters
b. Humidifier, sound attenuator, or blank post-evaporator section
c. Top or right discharge
d. Discharge plenum
5. Small post-evaporator blank can contain blank or nallter or humidier or sound attenuator.
6. Large post-evaporator blank can contain blank or sound attenuator and nal lter or sound attenuator and humidier or humidier or sound attenuator.
7. Discharge plenum is required with all units that are cooling only. Discharge plenum is required on all units with heat section cabinet.
8. Supply fan weights include the supply fan, motor, isolators, inlet guards, shaft grounding ring, variable frequency drive (VFD), line reactor, disconnect, and VFD bypass.
9. Economizer with exhaust/return fan includes the weight of the fan, isolator, shaft grounding rings, extended lube lines, and inlet guards.
10. The exhaust/return fan motor includes the weights of the motor, VFD, line reactor, and VFD bypass.
11. All sizes of electric heat.
12. A transformer is required if convenience outlet, gas heat, lights, or high end display are selected.
13. Roof curb weight is not included with this table.
Johnson Controls
87
5513350-JTG-1018
Weights and Dimensions (Continued)
Dimensions
Energy recovery wheel (ERW)
Discharge through heat
(bottom, left)
LD27642
Post evaporator blank section
(small post evaporator blank shown)
Discharge plenum
(bottom, left, right, top)
Heat section
Figure 12: Rooftop Unit Component Locations
88
LD27643
Johnson Controls
Weights and Dimensions (Continued)
Outside air hoods can be on the
Exhaust air hood can be on the
front or side of unit depending
on the return option
left or right side of unit depending
on the return option
5513350-JTG-1018
OA
Q
R
FRONT VIEW
W2
W3
N
M
L3
I
GL4
TOP VIEW
Gas heat flue for
gas heat option
H1
V
UW1
C
D
EA
H2
B
T P
L1S
1.25 inch NPT drain
F
right side only
H3
K
E
J
O
A
L2
SIDE VIEW (RIGHT SIDE)
AIRFLOW
Figure 13: 25–30 Ton Dimensional Drawing
Table 46: 25–30 Ton Unit Dimensions (inches) for Return Options with an ERW
Unit CongurationIf Unit has an Exhaust Fan with Backdraft Damper or Modulating Damper
Dimension SetML3W2NOPQR
Bottom Return, Right OA, Side Exhaust86.6351.3631.9459.9519.2621.007.0017.17
Bottom Return, Right OA, Front Exhaust86.6351.3631.9459.9519.2621.007.0017.17
Bottom Return, Left OA, Side Exhaust86.6351.3631.944.1819.2621.007.0017.17
Bottom Return, Left OA, Front Exhaust86.6351.3631.944.1819.2621.007.0017.17
Johnson Controls
LD27641
89
5513350-JTG-1018
Weights and Dimensions (Continued)
Table 47: 25–30 Ton Unit Dimensions (inches) for Return Options without an ERW
Unit CongurationIf Unit has a Return Fan with Modulating Damper
Dimension SetML3W2NOPQRML3W2NOPQR
Bottom Return, Right OA, Side Exhaust 13.76 33.73 37.61 44.47 35.45 10.22 7.00 17.17
Bottom Return, Right OA, Front Exhaust 13.76 33.73 37.61 44.47 35.45 10.22 7.00 17.17
Bottom Return, Left OA, Side Exhaust13.76 33.73 37.61 14.17 35.45 10.22 7.00 17.17
Bottom Return, Left OA, Front Exhaust13.76 33.73 37.61 14.17 35.45 10.22 7.00 17.17
Top Return, Right OA, Side ExhaustN/AN/AN/AN/AN/AN/AN/AN/A
Top Return, Right OA, Front ExhaustN/AN/AN/AN/AN/AN/AN/AN/A
Top Return, Left OA, Side ExhaustN/AN/AN/AN/AN/AN/AN/AN/A
Top Return, Left OA, Front ExhaustN/AN/AN/AN/AN/AN/AN/AN/A
Dimension SetSL1H2TOPQR
Left Return, Right OA, Front Exhaust11.01 39.00 39.00 10.34 35.45 10.22 7.00 17.17
Right Return, Left OA, Front Exhaust11.01 39.00 39.00 10.34 35.45 10.22 7.00 17.17
Dimension SetUW1H1VOPQR
Front Return, Left OA, Right Exhaust11.01 39.00 39.00 10.34 35.45 10.22 7.00 17.17
Front Return, Right OA, Left Exhaust46.24 39.00 39.00 10.34 35.45 10.22 7.00 17.17
Unit CongurationIf Unit has NO Fan and Barometric Damper
Dimension SetML3W2NOP
Bottom Return, Right OA, Side Exhaust 13.76 33.73 51.00 33.55 22.45 16.55 7.00 17.17
Bottom Return, Right OA, Front Exhaust 13.76 33.73 51.00 33.55 22.45 16.55 7.00 17.17
Bottom Return, Left OA, Side Exhaust13.76 33.73 51.00 11.70 22.45 16.55 7.00 17.17
Bottom Return, Left OA, Front Exhaust13.76 33.73 51.00 11.70 22.45 16.55 7.00 17.17
Bottom Return, No OA, No EA13.76 33.73 51.00 33.55 N/AN/AN/AN/A
Top Return, Right OA, Side Exhaust8.98 38.00 45.26 25.50 22.45 16.55 7.00 17.17
Top Return, Right OA, Front Exhaust8.98 38.00 45.26 25.50 22.45 16.55 7.00 17.17
Top Return, Left OA, Side Exhaust8.98 38.00 45.26 25.50 22.45 16.55 7.00 17.17
Top Return, Left OA, Front Exhaust8.98 38.00 45.26 25.50 22.45 16.55 7.00 17.17
Top Return, No OA, No EA8.98 38.00 45.26 25.50 N/AN/AN/AN/A
Dimension SetSL1H2TOPQR
Left Return, Right OA, Front Exhaust10.51 40.00 40.00 8.19 22.45 16.55 7.00 17.17
Left Return, No OA, No EA10.51 40.00 40.00 8.19 N/AN/AN/AN/A
Right Return, Left OA, Front Exhaust10.51 40.00 40.00 8.19 22.45 16.55 7.00 17.17
Right Return, No OA, No EA10.51 40.00 40.00 8.19 N/A
Dimension SetUW1H1VOPQR
Front Return, Left OA, Right Exhaust10.51 40.00 40.00 8.19 22.45 16.55 7.00 17.17
Front Return, Right OA, Left Exhaust45.74 40.00 40.00 8.19 22.45 16.55 7.00 17.17
Front Return, No OA, No EA10.51 40.00 40.00 8.19 N/AN/AN/AN/A
QR
N/AN/AN/A
If Unit has an Exhaust Fan with Backdraft Damper
13.76 33.73 51.00 33.55 19.26 21.00 7.00 17.17
13.76 33.73 51.00 33.55 19.26 21.00 7.00 17.17
13.76 33.73 51.00 11.70 19.26 21.00 7.00 17.17
13.76 33.73 51.00 11.70 19.26 21.00 7.00 17.17
8.98 38.00 45.26 25.50 19.26 21.00 7.00 17.17
8.98 38.00 45.26 25.50 19.26 21.00 7.00 17.17
8.98 38.00 45.26 25.50 19.26 21.00 7.00 17.17
8.98 38.00 45.26 25.50 19.26 21.00 7.00 17.17
SL1H2TOPQR
10.51 40.00 40.00 8.19 19.26 21.00 7.00 17.17
10.51 40.00 40.00 8.19 19.26 21.00 7.00 17.17
UW1H1VOPQR
10.51 40.00 40.00 8.19 19.26 21.00 7.00 17.17
45.74 40.00 40.00 8.19 19.26 21.00 7.00 17.17
or Modulating Damper
90
Johnson Controls
Weights and Dimensions (Continued)
Table 48: 25–30 Ton Unit Dimensions (inches)
Unit Conguration
5513350-JTG-1018
No ERW
ERW
UNIT WIDTH
UNIT LENGTH (A)
SU with Vertical Filter 4-inch, DP (B, L, R, T)264.4055.0096.0599.2495.502.75
SU with DP (B, L, R, T)281.4055.0096.0599.24112.502.75
SU with Pre-Evap Blank, Small Post-Evap blank, DP (B, L, R, T)379.4055.0096.0599.24165.502.75
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)421.4055.0096.0599.24165.502.75
No Heat
SU with Small Post-Evap Blank, DP (B, L, R, T)326.4055.0096.0599.24112.502.75
SU with Large Post-Evap Blank, DP (B, L, R, T)374.9055.0096.0599.24112.502.75
SU with Vertical Filter 4-inch, Discharge through Heat Section (B, L)281.4055.0096.0599.2495.502.75
SU with Discharge through Heat Section (B, L) 298.4055.0096.0599.24112.502.75
SU with Heat, DP (B, L, R, T)333.0055.0096.0599.24112.502.75
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 351.4055.0096.0599.24165.502.75
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)386.0055.0096.0599.24165.502.75
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B,L,R,T)431.0055.0096.0599.24165.502.75
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B,L,R,T)473.0055.0096.0599.24165.502.75
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)379.4055.0096.0599.24112.502.75
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)421.4055.0096.0599.24112.502.75
SU with Pre-Evap Blank, Small Post-Evap Blank, DP (B, L, R, T)455.9055.0096.0599.24242.002.75
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)497.9055.0096.0599.24242.00
SU with Small Post-Evap Blank, DP (B, L, R, T)402.9055.0096.0599.24189.002.75
No Heat
SU with Large Post-Evap Blank, DP (B, L, R, T)444.9055.0096.0599.24189.002.75
SU with Discharge through Heat Section (B, L) 374.9055.0096.0599.24189.002.75
SU with Heat, DP (B, L, R, T)409.5055.0096.0599.24189.002.75
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 431.0055.0096.0599.24245.102.75
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)462.5055.0096.0599.24242.002.75
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B, L, R, T)507.5055.0096.0599.24242.002.75
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B, L, R, T)549.5055.0096.0599.24242.002.75
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)455.9055.0096.0599.24189.002.75
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)497.9055.0096.0599.24189.002.75
UNIT HEIGHT (B)
UNIT WIDTH (C)
LIFTING LUG TO
EVAPORATOR
LIFTING LUG (D)
DRAIN LENGTH (E)
EVAPORATOR
DRAIN HEIGHT (F)
2.75
NOTES:
1. A standard unit includes length for economizer, draw-thru lter, cooling coil, supply fan, and condenser. A standard unit includes a draw-thru (preevaporator) lter with 2-inch angle lter or 2-inch + 12-inch (or 18-inch) lter. Units with a vertical 4-inch draw-thru lter in place of the standard 2-inch
angle or 2-inch + 12-inch (or 18-inch) lter are listed as "SU with Vertical Filter 4-inch."
2. The heat section includes either gas, hot water, steam, or electric.
3. SU = Standard Unit DP = Discharge Plenum B = Bottom Discharge L = Left Discharge R = Right Discharge T = Top Discharge
4. Dimensions are ± 1 inch.
Johnson Controls
91
5513350-JTG-1018
Weights and Dimensions (Continued)
Table 49: 25–30 Ton Unit Dimensions (inches) with Bottom and Top Discharge
Unit Conguration
SU with Vertical Filter 4-inch, DP (B, L, R, T)158.09 30.139.5377.00 158.09 30.139.5377.00
SU with DP (B, L, R, T)175.09 30.139.5377.00 175.09 30.139.5377.00
SU with Pre-Evap Blank, Small Post-Evap blank, DP (B, L, R, T)273.09 30.139.5377.00 273.09 30.139.5377.00
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)315.09 30.139.5377.00 315.09 30.139.5377.00
No Heat
SU with Small Post-Evap Blank, DP (B, L, R, T)220.09 30.139.5377.00 220.09 30.139.5377.00
SU with Large Post-Evap Blank, DP (B, L, R, T)268.59 30.139.5377.00 268.59 30.139.5377.00
SU with Vertical Filter 4-inch, Discharge through Heat Section (B, L)162.75 40.00 25.8950.00N/AN/AN/AN/A
SU with Discharge through Heat Section (B, L) 179.75 40.00 25.8950.00N/AN/AN/AN/A
No ERW
SU with Heat, DP (B, L, R, T)226.69 30.139.5377.00 226.69 30.139.5377.00
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 232.75 40.0025.89 50.00N/AN/AN/AN/A
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)279.69 30.139.5377.00 279.69 30.139.5377.00
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B,L,R,T)324.69 30.139.5377.00 324.69 30.139.5377.00
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B,L,R,T)366.69 30.139.5377.00 366.69 30.139.5377.00
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)273.09 30.13
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)315.09 30.139.5377.00 315.09 30.139.5377.00
SU with Pre-Evap Blank, Small Post-Evap Blank, DP (B, L, R, T)349.59 30.139.5377.00 349.59 30.139.5377.00
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)391.59 30.139.5377.00 391.59 30.139.5377.00
SU with Small Post-Evap Blank, DP (B, L, R, T)296.59 30.139.5377.00 296.59 30.139.5377.00
No Heat
SU with Large Post-Evap Blank, DP (B, L, R, T)338.59 30.139.5377.00 338.59 30.139.5377.00
SU with Discharge through Heat Section (B, L) 256.25 40.00 25.8950.00N/AN/AN/AN/A
SU with Heat, DP (B, L, R, T)303.19 30.139.5377.00 303.19 30.139.5377.00
ERW
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 312.35 40.0025.89 50.00N/AN/AN/AN/A
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)356.19 30.139.5377.00 356.19 30.139.5377.00
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B, L, R, T) 401.19 30.139.5377.00 401.19 30.139.5377.00
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B, L, R, T) 443.19 30.139.5377.00 443.19 30.139.5377.00
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)349.59 30.139.5377.00 349.59 30.139.5377.00
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)391.59 30.139.5377.00 391.59 30.139.5377.00
Bottom DischargeTop Discharge
GL4IW3GL4IW3
9.5377.00 273.09 30.139.5377.00
NOTES:
1. A standard unit includes length for economizer, draw-thru lter, cooling coil, supply fan, and condenser. A standard unit includes a draw-thru (preevaporator) lter with 2-inch angle lter or 2-inch + 12-inch (or 18-inch) lter. Units with a vertical 4-inch draw-thru lter in place of the standard 2-inch
angle or 2-inch + 12-inch (or 18-inch) lter are listed as "SU with Vertical Filter 4-inch."
2. The heat section includes either gas, hot water, steam, or electric.
3. SU = Standard Unit DP = Discharge Plenum B = Bottom Discharge L = Left Discharge R = Right Discharge T = Top Discharge
4. Dimensions are ± 1 inch.
92
Johnson Controls
Weights and Dimensions (Continued)
Table 50: 25–30 Ton Unit Dimensions (inches) with Left and Right Discharge
Unit Conguration
SU with Vertical Filter 4-inch, DP (B, L, R, T)159.06 28.214.6547.04 159.06 28.214.6547.04
SU with DP (B, L, R, T)176.06 28.214.6547.04 176.06 28.214.6547.04
SU with Pre-Evap Blank, Small Post-Evap blank, DP (B, L, R, T)274.06 28.214.6547.04 274.06 28.214.6547.04
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)316.06 28.214.6547.04 316.06 28.214.6547.04
No Heat
SU with Small Post-Evap Blank, DP (B, L, R, T)221.06 28.214.6547.04 221.06 28.214.6547.04
SU with Large Post-Evap Blank, DP (B, L, R, T)269.56 28.214.6547.04 269.56 28.214.6547.04
SU with Vertical Filter 4-inch, Discharge through Heat Section (B, L)160.75 43.00 15.0934.00N/AN/AN/AN/A
SU with Discharge through Heat Section (B, L) 177.75 43.00 15.0934.00N/AN/AN/AN/A
No ERW
SU with Heat, DP (B, L, R, T)227.66 28.214.6547.04 227.66 28.214.6547.04
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 230.75 43.0015.09 34.00N/AN/AN/AN/A
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)280.66 28.214.6547.04 280.66 28.214.6547.04
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B,L,R,T)325.66 28.214.6547.04 325.66 28.214.6547.04
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B,L,R,T)367.66 28.214.6547.04 367.66 28.214.6547.04
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)274.06 28.21
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)316.06 28.214.6547.04 316.06 28.214.6547.04
SU with Pre-Evap Blank, Small Post-Evap Blank, DP (B, L, R, T)350.56 28.214.6547.04 350.56 28.214.6547.04
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)392.56 28.214.6547.04 392.56 28.214.6547.04
SU with Small Post-Evap Blank, DP (B, L, R, T)297.56 28.214.6547.04 297.56 28.214.6547.04
No Heat
SU with Large Post-Evap Blank, DP (B, L, R, T)339.56 28.214.6547.04 339.56 28.214.6547.04
SU with Discharge through Heat Section (B, L) 254.25 43.00 15.0934.00N/AN/AN/AN/A
SU with Heat, DP (B, L, R, T)304.16 28.214.6547.04 304.16 28.214.6547.04
ERW
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 310.35 43.0015.09 34.00N/AN/AN/AN/A
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)357.16 28.214.6547.04 357.16 28.214.6547.04
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B, L, R, T) 402.16 28.214.6547.04 402.16 28.214.6547.04
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B, L, R, T) 444.16 28.214.6547.04 444.16 28.214.6547.04
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)350.56 28.214.6547.04 350.56 28.214.6547.04
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)392.56 28.214.6547.04 392.56 28.214.6547.04
Left DischargeRight Discharge
JL2KH3JL2KH3
5513350-JTG-1018
4.6547.04 274.06 28.214.6547.04
NOTES:
1. A standard unit includes length for economizer, draw-thru lter, cooling coil, supply fan, and condenser. A standard unit includes a draw-thru (preevaporator) lter with 2-inch angle lter or 2-inch + 12-inch (or 18-inch) lter. Units with a vertical 4-inch draw-thru lter in place of the standard 2-inch
angle or 2-inch + 12-inch (or 18-inch) lter are listed as "SU with Vertical Filter 4-inch."
2. The heat section includes either gas, hot water, steam, or electric.
3. SU = Standard Unit DP = Discharge Plenum B = Bottom Discharge L = Left Discharge R = Right Discharge T = Top Discharge
4. Dimensions are ± 1 inch.
Johnson Controls
93
5513350-JTG-1018
Weights and Dimensions (Continued)
Outside air hoods can be on the
left or right side of unit depending
Exhaust air hood can
be on the front or side
of unit depending on
the return option
N
on the return option
W3W2
Q
R
FRONT VIEW
M
L3
G
L4
I
TOP VIEW
Gas heat flue for
gas heat option
H1
H2
B
V
UW1
C
D
T P
L1S
E
O
F
1.25 inch NPT drain
right side only
J
L2
A
H3
K
SIDE VIEW (RIGHT SIDE)
AIRFLOW
LD27644
Figure 14: 40–50 Ton Dimensional Drawing
Table 51: 40–50 Ton Unit Dimensions (inches) for Return Options with an ERW
Unit CongurationERW Only Available with an Exhaust Fan with Backdraft Damper or Modulating Damper
Dimension SetML3W2NOPQR
Bottom Return, Right OA, Side Exhaust93.5752.8645.0046.9031.1323.404.1017.27
Bottom Return, Right OA, Front Exhaust93.5752.8645.0046.9031.1323.404.1017.27
Bottom Return, Left OA, Side Exhaust93.5752.8645.004.1831.1323.404.1017.27
Bottom Return, Left OA, Front Exhaust93.5752.8645.004.1831.1323.404.1017.27
94
Johnson Controls
5513350-JTG-1018
Weights and Dimensions (Continued)
Table 52: 25–30 Ton Unit Dimensions (inches) for Return Options without an ERW
Unit CongurationIf Unit has a Return Fan with Modulating Damper
Top Return, Right OA, Side ExhaustN/AN/AN/AN/AN/AN/AN/AN/A4.31 47.34 58.04 19.10 31.13 23.40 4.10 17.27
Top Return, Right OA, Front ExhaustN/AN/AN/AN/AN/AN/AN/AN/A4.31 47.34 58.04 19.10 31.13 23.40 4.10 17.27
Top Return, Left OA, Side ExhaustN/AN/AN/AN/AN/AN/AN/AN/A4.31 47.34
Top Return, Left OA, Front ExhaustN/AN/AN/AN/AN/AN/AN/AN/A4.31 47.34 58.04 19.10 31.13 23.40 4.10 17.27
Dimension SetSL1H2TOPQRSL1H2TOPQR
Left Return, Right OA, Front Exhaust11.13 43.00 43.00 10.34 46.87 14.46 4.10 17.27 7.63 50.00 55.00 8.19 31.13 23.40 4.10 17.27
Right Return, Left OA, Front Exhaust11.13 43.00 43.00 10.34 46.87 14.46 4.10 17.27 7.63 50.00 55.00 8.19 31.13 23.40 4.10 17.27
Dimension SetUW1H1VOPQRUW1H1VOPQR
Front Return, Left OA, Right Exhaust11.13 43.00 43.00 10.34 46.87 14.46 4.10 17.27 7.63 50.00 55.00 8.19 31.13 23.40 4.10 17.27
Front Return, Right OA, Left Exhaust42.12 43.00 43.00 10.34 46.87 14.46 4.10 17.27 38.62 50.00 55.00 8.19 31.13 23.40 4.10 17.27
Unit CongurationIf Unit has NO Fan and Barometric Damper
Dimension SetML3W2NOP
Bottom Return, Right OA, Side Exhaust 13.76 37.63 72.99 18.98 29.16 20.18 4.10 17.27
Bottom Return, Right OA, Front Exhaust 13.76 37.63 72.99 18.98 29.16 20.18 4.10 17.27
Bottom Return, Left OA, Side Exhaust13.76 37.63 72.99 4.18 29.16 20.18 4.10 17.27
Bottom Return, Left OA, Front Exhaust13.76 37.63 72.99 4.18 29.16 20.18 4.10 17.27
Bottom Return, No OA, No EA13.76 37.63 72.99 18.98 N/AN/AN/AN/A
Top Return, Right OA, Side Exhaust4.31 47.34 58.04 19.10 29.16 20.18 4.10 17.27
Top Return, Right OA, Front Exhaust4.31 47.34 58.04 19.10 29.16 20.18 4.10 17.27
Top Return, Left OA, Side Exhaust4.31 47.34 58.04 19.10 29.16 20.18 4.10 17.27
Top Return, Left OA, Front Exhaust4.31 47.34 58.04 19.10 29.16 20.18 4.10 17.27
Top Return, No OA, No EA4.31 47.34 58.04 19.10 N/AN/AN/AN/A
Dimension SetSL1H2TOPQR
Left Return, Right OA, Front Exhaust7.63 50.00 55.00 8.19 29.16 20.18 4.10 17.27
Left Return, No OA, No EA7.63 50.00 55.00 8.19 N/AN/AN/AN/A
Right Return, Left OA, Front Exhaust7.63 50.00 55.00 8.19 29.16 20.18 4.10 17.27
Right Return, No OA, No EA7.63 50.00 55.00 8.19 N/A
Dimension SetUW1H1VOPQR
Front Return, Left OA, Right Exhaust7.63 50.00 55.00 8.19 29.16 20.18 4.10 17.27
Front Return, Right OA, Left Exhaust38.62 50.00 55.00 8.19 29.16 20.18 4.10 17.27
Front Return, No OA, No EA7.63 50.00 55.00 8.19 N/AN/AN/AN/A
QR
N/AN/AN/A
If Unit has an Exhaust Fan with Backdraft Damper
or Modulating Damper
58.04 19.10 31.13 23.40 4.10 17.27
Johnson Controls
95
5513350-JTG-1018
Weights and Dimensions (Continued)
Table 53: 40–50 Ton Unit Dimensions (inches)
Unit Conguration
No ERW
ERW
UNIT WIDTH
UNIT LENGTH (A)
SU with Vertical Filter 4-inch, DP (B, L, R, T)
SU with DP (B, L, R, T)
SU with Pre-Evap Blank, Small Post-Evap blank, DP (B, L, R, T)
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)
No Heat
SU with Small Post-Evap Blank, DP (B, L, R, T)
SU with Large Post-Evap Blank, DP (B, L, R, T)
SU with Vertical Filter 4-inch, Discharge through Heat Section (B, L)
SU with Discharge through Heat Section (B, L)
SU with Heat, DP (B, L, R, T)
SU with Pre-Evap Blank, Discharge through Heat Section (B, L)
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B,L,R,T)
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B,L,R,T)
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)
SU with Pre-Evap Blank, Small Post-Evap Blank, DP (B, L, R, T)486.7070.0096.0599.24250.502.75
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)528.7070.0096.0599.24250.50
SU with Small Post-Evap Blank, DP (B, L, R, T)433.7070.0096.0599.24197.502.75
No Heat
SU with Large Post-Evap Blank, DP (B, L, R, T)475.7070.0096.0599.24197.502.75
SU with Discharge through Heat Section (B, L) 405.7070.0096.0599.24197.502.75
SU with Heat, DP (B, L, R, T)440.3070.0096.0599.24197.502.75
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 463.8070.0096.0599.24255.602.75
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)493.3070.0096.0599.24250.502.75
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B, L, R, T)538.3070.0096.0599.24250.502.75
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B, L, R, T)580.3070.0096.0599.24250.502.75
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)486.7070.0096.0599.24197.502.75
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)528.7070.0096.0599.24197.502.75
297.2070.0096.0599.24106.002.75
314.2070.0096.0599.24123.002.75
412.2070.0096.0599.24176.002.75
454.2070.0096.0599.24176.002.75
359.2070.0096.0599.24123.002.75
405.7070.0096.0599.24123.002.75
314.2070.0096.0599.24106.002.75
331.2070.0096.0599.24123.002.75
365.8070.0096.0599.24123.002.75
384.2070.0096.0599.24176.002.75
418.8070.0096.0599.24176.002.75
463.8070.0096.0599.24176.002.75
505.8070.0096.0599.24176.002.75
412.2070.0096.0599.24123.002.75
454.2070.0096.0599.24123.002.75
UNIT HEIGHT (B)
UNIT WIDTH (C)
LIFTING LUG TO
EVAPORATOR
LIFTING LUG (D)
DRAIN LENGTH (E)
EVAPORATOR
DRAIN HEIGHT (F)
2.75
NOTES:
1. A standard unit includes length for economizer, draw-thru lter, cooling coil, supply fan, and condenser. A standard unit includes a draw-thru (preevaporator) lter with 2-inch angle lter or 2-inch + 12-inch (or 18-inch) lter. Units with a vertical 4-inch draw-thru lter in place of the standard 2-inch
angle or 2-inch + 12-inch (or 18-inch) lter are listed as "SU with Vertical Filter 4-inch."
2. The heat section includes either gas, hot water, steam, or electric.
3. SU = Standard Unit DP = Discharge Plenum B = Bottom Discharge L = Left Discharge R = Right Discharge T = Top Discharge
4. Dimensions are ± 1 inch.
96
Johnson Controls
Weights and Dimensions (Continued)
Table 54: 40–50 Ton Unit Dimensions (inches) with Bottom and Top Discharge
Unit Conguration
SU with Vertical Filter 4-inch, DP (B, L, R, T)175.59 30.139.5377.00 175.59 30.139.5377.00
SU with DP (B, L, R, T)192.59 30.139.5377.00 192.59 30.139.5377.00
SU with Pre-Evap Blank, Small Post-Evap blank, DP (B, L, R, T)290.59 30.139.5377.00 290.59 30.139.5377.00
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)332.59 30.139.5377.00 332.59 30.139.5377.00
No Heat
SU with Small Post-Evap Blank, DP (B, L, R, T)237.59 30.139.5377.00 237.59 30.139.5377.00
SU with Large Post-Evap Blank, DP (B, L, R, T)284.09 30.139.5377.00 284.09 30.139.5377.00
SU with Vertical Filter 4-inch, Discharge through Heat Section (B, L)180.25 40.00 25.8950.00N/AN/AN/AN/A
SU with Discharge through Heat Section (B, L) 197.25 40.00 25.8950.00N/AN/AN/AN/A
No ERW
SU with Heat, DP (B, L, R, T)244.19 30.139.5377.00 244.19 30.139.5377.00
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 250.25 40.0025.89 50.00N/AN/AN/AN/A
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)297.19 30.139.5377.00 297.19 30.139.5377.00
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B,L,R,T)342.19 30.139.5377.00 342.19 30.139.5377.00
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B,L,R,T)384.19 30.139.5377.00 384.19 30.139.5377.00
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)290.59 30.13
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)332.59 30.139.5377.00 332.59 30.139.5377.00
SU with Pre-Evap Blank, Small Post-Evap Blank, DP (B, L, R, T)365.09 30.139.5377.00 365.09 30.139.5377.00
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)407.09 30.139.5377.00 407.09 30.139.5377.00
SU with Small Post-Evap Blank, DP (B, L, R, T)312.09 30.139.5377.00 312.09 30.139.5377.00
No Heat
SU with Large Post-Evap Blank, DP (B, L, R, T)354.09 30.139.5377.00 354.09 30.139.5377.00
SU with Discharge through Heat Section (B, L) 271.75 40.00 25.8950.00N/AN/AN/AN/A
SU with Heat, DP (B, L, R, T)318.69 30.139.5377.00 318.69 30.139.5377.00
ERW
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 329.85 40.0025.89 50.00N/AN/AN/AN/A
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)371.69 30.139.5377.00 371.69 30.139.5377.00
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B, L, R, T) 416.69 30.139.5377.00 416.69 30.139.5377.00
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B, L, R, T) 458.69 30.139.5377.00 458.69 30.139.5377.00
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)365.09 30.139.5377.00 365.09 30.139.5377.00
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)407.09 30.139.5377.00 407.09 30.139.5377.00
Bottom DischargeTop Discharge
GL4IW3GL4IW3
5513350-JTG-1018
9.5377.00 290.59 30.139.5377.00
NOTES:
1. A standard unit includes length for economizer, draw-thru lter, cooling coil, supply fan, and condenser. A standard unit includes a draw-thru (preevaporator) lter with 2-inch angle lter or 2-inch + 12-inch (or 18-inch) lter. Units with a vertical 4-inch draw-thru lter in place of the standard 2-inch
angle or 2-inch + 12-inch (or 18-inch) lter are listed as "SU with Vertical Filter 4-inch."
2. The heat section includes either gas, hot water, steam, or electric.
3. SU = Standard Unit DP = Discharge Plenum B = Bottom Discharge L = Left Discharge R = Right Discharge T = Top Discharge
4. Dimensions are ± 1 inch.
Johnson Controls
97
5513350-JTG-1018
Weights and Dimensions (Continued)
Table 55: 40–50 Ton Unit Dimensions (inches) with Left and Right Discharge
Unit Conguration
SU with Vertical Filter 4-inch, DP (B, L, R, T)176.56 28.214.6562.04 176.56 28.214.6562.04
SU with DP (B, L, R, T)193.56 28.214.6562.04 193.56 28.214.6562.04
SU with Pre-Evap Blank, Small Post-Evap blank, DP (B, L, R, T)291.56 28.214.6562.04 291.56 28.214.6562.04
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)333.56 28.214.6562.04 333.56 28.214.6562.04
No Heat
SU with Small Post-Evap Blank, DP (B, L, R, T)238.56 28.214.6562.04 238.56 28.214.6562.04
SU with Large Post-Evap Blank, DP (B, L, R, T)285.06 28.214.6562.04 285.06 28.214.6562.04
SU with Vertical Filter 4-inch, Discharge through Heat Section (B, L)180.25 40.00 14.0950.00N/AN/AN/AN/A
SU with Discharge through Heat Section (B, L) 197.25 40.00 14.0950.00N/AN/AN/AN/A
No ERW
SU with Heat, DP (B, L, R, T)245.16 28.214.6562.04 245.16 28.214.6562.04
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 250.25 40.0014.09 50.00N/AN/AN/AN/A
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)298.16 28.214.6562.04 298.16 28.214.6562.04
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B,L,R,T)343.16 28.214.6562.04 343.16 28.214.6562.04
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B,L,R,T)385.16 28.214.6562.04 385.16 28.214.6562.04
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)291.56 28.21
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)333.56 28.214.6562.04 333.56 28.214.6562.04
SU with Pre-Evap Blank, Small Post-Evap Blank, DP (B, L, R, T)366.06 28.214.6562.04 366.06 28.214.6562.04
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)408.06 28.214.6562.04 408.06 28.214.6562.04
SU with Small Post-Evap Blank, DP (B, L, R, T)313.06 28.214.6562.04 313.06 28.214.6562.04
No Heat
SU with Large Post-Evap Blank, DP (B, L, R, T)355.06 28.214.6562.04 355.06 28.214.6562.04
SU with Discharge through Heat Section (B, L) 271.75 40.00 14.0950.00N/AN/AN/AN/A
SU with Heat, DP (B, L, R, T)319.66 28.214.6562.04 319.66 28.214.6562.04
ERW
SU with Pre-Evap Blank, Discharge through Heat Section (B, L) 329.85 40.0014.09 50.00N/AN/AN/AN/A
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)372.66 28.214.6562.04 372.66 28.214.6562.04
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B, L, R, T) 417.66 28.214.6562.04 417.66 28.214.6562.04
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B, L, R, T) 459.66 28.214.6562.04 459.66 28.214.6562.04
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)366.06 28.214.6562.04 366.06 28.214.6562.04
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)408.06 28.214.6562.04 408.06 28.214.6562.04
Left DischargeRight Discharge
JL2KH3JL2KH3
4.6562.04 291.56 28.214.6562.04
NOTES:
1. A standard unit includes length for economizer, draw-thru lter, cooling coil, supply fan, and condenser. A standard unit includes a draw-thru (preevaporator) lter with 2-inch angle lter or 2-inch + 12-inch (or 18-inch) lter. Units with a vertical 4-inch draw-thru lter in place of the standard 2-inch
angle or 2-inch + 12-inch (or 18-inch) lter are listed as "SU with Vertical Filter 4-inch."
2. The heat section includes either gas, hot water, steam, or electric.
3. SU = Standard Unit DP = Discharge Plenum B = Bottom Discharge L = Left Discharge R = Right Discharge T = Top Discharge
4. Dimensions are ± 1 inch.
98
Johnson Controls
5513350-JTG-1018
Weights and Dimensions (Continued)
Table 56: Blank Sections
Post-Evaporator Blank
Small BlankLarge Blank
EmptyEmptyEmpty
HumidierHumidierAir Blender
Options
Sound AttenuatorSound Attenuator
Final Filter
Sound Attenuator and Final Filter
Sound Attenuator and Humidier
Example to Determine Unit Length
G V B 1 C – 1 B 5 G A – 1 A 6 0 A – E 2 0 2 B – E 2 A D G – 2 C 0 E 0 – D M A A 3 – 1 0 0 1 A – 0 0 0 C G – 0 0 0 1
Pre-Evaporator Blank
3
5
12
11
The following options are critical when determining unit
Using the model number given as an example above, determine the unit length from Table 46 through Table 56.
Unit length = [tonnage of the unit (30 ton) + economizer +
draw-thru filter (2-inch) + cooling coil + supply fan + condenser]* + no ERW (refer to the No ERW section of the
dimensions tables) + no pre-evap blank
*Note: A standard unit includes length for economizer,
draw-thru filter, cooling coil, supply fan, and condenser. A
standard unit includes a draw-thru (pre-evaporator) filter
with 2-inch angle filter or 2-inch + 12-inch (or 18-inch) filter.
Units with a vertical 4-inch draw-thru filter in place of the
standard 2-inch angle or 2-inch + 12-inch (or 18-inch) filter
are listed as "SU with Vertical Filter 4-inch."
Based on the unit options selected, the configuration is a
standard unit with heat, discharge plenum (B, L, R, T). For
this example, the length of the unit is 333.00 inches.
Johnson Controls
99
5513350-JTG-1018
E
Weights and Dimensions (Continued)
Roof Curb Dimensions
Cond LGAHUCurb LG
A
RAL
WD
Curb WD
RAR
WD
Cross Braces as Required
RA
Cross Braces as Required
LG
Return
Air
Left
Return
Airflow
Air
Right
Extra brace only needed when supply air is in the
SA
LG
Supply
Air
C
D
SA WD
2.0 TYP
heat section, in which case the C dimension will
have a value. If supply air is in the discharge
section, supply air will go against the end of the
AHU curb LG and C dimension will have no value.
14 inches
LD27617
Figure 15: 25–50 Ton Roof Curbs: Left and Right Bottom Return Opening and Bottom Supply Opening with ERW
Table 57: 25–50 Ton Roof Curbs: Left and Right Bottom Return Opening and Bottom Supply Opening with ERW
25–30 Ton Right Bottom Return Opening and Bottom Supply Opening with ERW
Unit Conguration
SU with Pre-Evap Blank, Small Post-Evap Blank, DP (B, L, R, T)See SU with Heat, Small Post-Evap Blank, DP (B, L, R, T)
SU with Pre-Evap Blank, Large Post-Evap Blank, DP (B, L, R, T)See SU with Heat, Large Post-Evap Blank, DP (B, L, R, T)
SU with Small Post-Evap Blank, DP (B, L, R, T)330.90 96.05 326.40 91.5572.00 398.40 84.38
No Heat
SU with Large Post-Evap Blank, DP (B, L, R, T)372.90 96.05 368.40 91.5572.00 440.40 84.38
SU with Discharge Through Heat Section (B, L) 302.90 96.05 298.40 91.5572.00 370.40 84.38
SU with Heat, DP (B, L, R, T)337.50 96.05 333.00 91.5572.00 405.00 84.38
SU with Pre-Evap Blank, Discharge Through Heat Section (B, L) 359.00 96.05 354.50 91.5572.00 426.50 84.38
SU with Pre-Evap Blank, Heat, DP (B, L, R, T)390.50 96.05 386.00 91.5572.00 458.00 84.38
Heat
SU with Pre-Evap Blank, Heat, Small Post-Evap Blank, DP (B, L, R, T) 435.50 96.05 431.00 91.5572.00 503.00 84.38
SU with Pre-Evap Blank, Heat, Large Post-Evap Blank, DP (B, L, R, T) 477.50 96.05 473.00 91.5572.00 545.00 84.38
SU with Heat, Small Post-Evap Blank, DP (B, L, R, T) 383.90 96.05 379.40 91.5572.00 451.40 84.38
SU with Heat, Large Post-Evap Blank, DP (B, L, R, T) 425.90 96.05 421.40 91.5572.00 493.40 84.38
AHU LGUnit
WD
100
AHU
Curb
LG
Curb WDCond LGTotal
LG (E)
Johnson Controls
A
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