York Sunline 2000 User manual

INSTALLATION
MANUAL
CAUTION: READ ALL SAFETY GUIDES BEFORE YOU
BEGIN TO INSTALL YOUR UNIT.
SAVE THIS MANUAL
SUNLINE 2000™
SINGLE PACKAGE HEAT PUMP
MODEL: BQ 240
175245-YIM-C-1008
CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . .4
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
PRODUCT NOMENCLATURE . . . . . . . . . . . . . . . . . . . .5
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
START-UP (COOLING) . . . . . . . . . . . . . . . . . . . . . . . . .30
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . .31
MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
See the following page for a complete Table of
Contents.
NOTES, CAUTIONS AND WARNINGS
Installer should pay particular attention to the words:
NOTE, CAUTION, and WARNING. Notes are intended to
clarify or make the installation easier. Cautions are given
to prevent equipment damage. Warnings are given to
alert installer that personal injury and/or equipment dam-
age may result if installation procedure is not handled
properly.

175245-YIM-C-1008
2Johnson Controls Unitary Products
TABLE OF CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . 4
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PRODUCT NOMENCLATURE . . . . . . . . . . . . . . . . . . . . 5
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
INSTALLATION SAFETY INFORMATION:. . . . . . . . . 6
LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RIGGING AND HANDLING. . . . . . . . . . . . . . . . . . . . . 7
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
FIXED OUTDOOR AIR INTAKE DAMPER . . . . . . . . . 8
CONDENSATE DRAIN . . . . . . . . . . . . . . . . . . . . . . . . 8
COMPRESSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SERVICE ACCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
POWER AND CONTROL WIRING . . . . . . . . . . . . . . 11
OPTIONAL ELECTRIC HEAT . . . . . . . . . . . . . . . . . . 11
OPTIONAL ECONOMIZER/MOTORIZED DAMPER
RAIN HOOD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPTIONAL POWER EXHAUST/BAROMETRIC RELIEF
DAMPER RAIN HOOD. . . . . . . . . . . . . . . . . . . . . . . . 12
OPTIONAL ECONOMIZER AND POWER EXHAUST
DAMPER SET POINT ADJUSTMENTS AND
INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
MINIMUM POSITION ADJUSTMENT . . . . . . . . . . . . . 12
ENTHALPY SET POINT ADJUSTMENT. . . . . . . . . . . 12
POWER EXHAUST DAMPER SETPOINT . . . . . . . . . 12
INDOOR AIR QUALITY AQ. . . . . . . . . . . . . . . . . . . . . 12
OPTIONAL BAS-READY ECONOMIZER POWER
EXHAUST DAMPER SET POINT ADJUSTMENT. . . 13
CFM, STATIC PRESSURE, AND POWER - ALTITUDE
AND TEMPERATURE CORRECTIONS . . . . . . . . . 20
PHASING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
CHECKING SUPPLY AIR CFM. . . . . . . . . . . . . . . . . 24
AIR BALANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SEQUENCE OF OPERATIONS OVERVIEW . . . . . . 26
COOLING SEQUENCE OF OPERATION. . . . . . . . . 26
CONTINUOUS BLOWER . . . . . . . . . . . . . . . . . . . . . . 26
INTERMITTENT BLOWER . . . . . . . . . . . . . . . . . . . . . 26
NO OUTDOOR AIR OPTIONS . . . . . . . . . . . . . . . . . . 26
ECONOMIZER WITH SINGLE ENTHALPY
SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
ECONOMIZER WITH DUAL ENTHALPY
SENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
ECONOMIZER WITH POWER EXHAUST -. . . . . . . . 27
MOTORIZED OUTDOOR AIR DAMPERS - . . . . . . . . 27
COOLING OPERATION ERRORS . . . . . . . . . . . . . . . 27
HIGH-PRESSURE LIMIT SWITCH. . . . . . . . . . . . . . . 27
LOW-PRESSURE LIMIT SWITCH . . . . . . . . . . . . . . . 27
FREEZESTAT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
LOW AMBIENT COOLING . . . . . . . . . . . . . . . . . . . . . 28
SAFETY CONTROLS. . . . . . . . . . . . . . . . . . . . . . . . 28
COMPRESSOR PROTECTION . . . . . . . . . . . . . . . . 28
FLASH CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
HEATING SEQUENCE OF OPERATIONS . . . . . . . 28
WITH ELECTRIC HEAT . . . . . . . . . . . . . . . . . . . . . . . 28
WITHOUT ELECTRIC HEAT . . . . . . . . . . . . . . . . . . . 29
HEATING OPERATION ERRORS . . . . . . . . . . . . . . 29
TEMPERATURE LIMIT. . . . . . . . . . . . . . . . . . . . . . . . 29
SAFETY CONTROLS. . . . . . . . . . . . . . . . . . . . . . . . 30
FLASH CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
HEAT ANTICIPATOR SETPOINTS . . . . . . . . . . . . . 30
START-UP (COOLING) . . . . . . . . . . . . . . . . . . . . . . . . 30
PRESTART CHECK LIST . . . . . . . . . . . . . . . . . . . . 30
OPERATING INSTRUCTIONS. . . . . . . . . . . . . . . . . 31
POST START CHECK LIST . . . . . . . . . . . . . . . . . . . 31
SHUT DOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 31
COOLING TROUBLESHOOTING GUIDE . . . . . . . . 31
UNIT FLASH CODES. . . . . . . . . . . . . . . . . . . . . . . . 36
UNIT CONTROL BOARD OPTION SETUP . . . . . . . 37
OPTION BYTE SETUP . . . . . . . . . . . . . . . . . . . . . . . . 37
HEAT DELAY SETUP. . . . . . . . . . . . . . . . . . . . . . . . . 37
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
NORMAL MAINTENANCE . . . . . . . . . . . . . . . . . . . . 38
FILTERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
MOTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
BLOWER SHAFT BEARING . . . . . . . . . . . . . . . . . . 38
OUTDOOR COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

175245-YIM-C-1008
Johnson Controls Unitary Products 3
LIST OF FIGURES
Fig. # Pg. #
1 TYPICAL RIGGING. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 CENTER OF GRAVITY. . . . . . . . . . . . . . . . . . . . . . . . . 7
3 FIXED OUTDOOR AIR DAMPER. . . . . . . . . . . . . . . . . 8
4 RECOMMENDED DRAIN PIPING . . . . . . . . . . . . . . . . 9
5 TYPICAL FIELD WIRING . . . . . . . . . . . . . . . . . . . . . . 10
6 ENTHALPY SETPOINT ADJUSTMENT . . . . . . . . . . . 13
7 HONEYWELL ECONOMIZER CONTROL W7212 . . . 14
8 FOUR AND SIX POINT LOADS . . . . . . . . . . . . . . . . . 14
9 CENTER OF GRAVITY. . . . . . . . . . . . . . . . . . . . . . . . 15
10 UNIT DIMENSIONS - 20 TON . . . . . . . . . . . . . . . . . . 18
11 REAR VIEW DIMENSIONS . . . . . . . . . . . . . . . . . . . . 19
12 UNIT WITH RAIN HOOD DIMENSIONS (20 TON) . . 19
13 ALTITUDE/TEMPERATURE CONVERSION
FACTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
14 BELT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . 24
15 PRESSURE DROP ACROSS A DRY INDOOR COIL
VS SUPPLY AIR CFM . . . . . . . . . . . . . . . . . . . . . . . . 25
16 UNIT CONTROL BOARD . . . . . . . . . . . . . . . . . . . . . . 37
LIST OF TABLES
Tbl. # Pg. #
1 UNIT APPLICATION DATA. . . . . . . . . . . . . . . . . . . . . . 6
2 CONTROL WIRE SIZES . . . . . . . . . . . . . . . . . . . . . . . 11
3 ELECTRIC HEAT APPLICATION DATA. . . . . . . . . . . 12
4 FOUR AND SIX POINT LOADS . . . . . . . . . . . . . . . . . 14
5 PHYSICAL DATA - BASIC UNIT. . . . . . . . . . . . . . . . . 15
6 OPERATING WEIGHTS (LBS.) . . . . . . . . . . . . . . . . . 15
7 VOLTAGE LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . 16
8 ELECTRICAL DATA -WITHOUT POWERED
CONVENIENCE OUTLET . . . . . . . . . . . . . . . . . . . . . 16
9 ELECTRICAL DATA -WITH POWERED CONVENIENCE
OUTLET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
10 ELECTRIC HEAT CORRECTION FACTORS. . . . . . . 17
11 MINIMUM CLEARANCES. . . . . . . . . . . . . . . . . . . . . . 18
12 UTILITIES ENTRY DATA . . . . . . . . . . . . . . . . . . . . . . 18
13 ALTITUDE CORRECTION FACTORS . . . . . . . . . . . . 20
14 BLOWER PERFORMANCE 20 TON SUPPLY AIR
BOTTOM DUCT CONNECTIONS . . . . . . . . . . . . . . . 22
15 STATIC RESISTANCES . . . . . . . . . . . . . . . . . . . . . . . 23
16 POWER EXHAUST PERFORMANCE . . . . . . . . . . . . 23
17 BLOWER MOTOR AND DRIVE DATA . . . . . . . . . . . . 23
18 LIMIT CONTROL SETTING . . . . . . . . . . . . . . . . . . . . 30
19 ELECTRIC HEAT ANTICIPATOR SETPOINTS . . . . . 30
20 UNIT CONTROL BOARD FLASH CODES . . . . . . . . . 36
21 HEAT DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

175245-YIM-C-1008
4Johnson Controls Unitary Products
GENERAL
YORK®Model BQ units are single package heat
pumps equipped with optional factory installed electric
heaters. These are designed for outdoor installation on
a rooftop or slab.
The units are completely assembled on rigid, perma-
nently attached base rails. All piping, refrigerant
charge, and electrical wiring is factory installed and
tested. The units require electric power, gas connec-
tion, duct connections, installation of combustion air
inlet hood, flue gas outlet hoods and fixed outdoor air
intake damper (units without economizer or motorized
damper option only) at the point of installation.
The supplemental electric heaters have nickel-chrome
elements and utilize single point power connection.
SAFETY CONSIDERATIONS
Due to system pressure, moving parts and electrical
components, installation and servicing of air condition-
ing equipment can be hazardous. Only qualified,
trained, service personnel should install, repair, main-
tain or service this equipment.
Observe all precautions in the literature, on labels and
tags accompanying the equipment whenever working
on air conditioning equipment. Be sure to follow all
other safety precautions that apply.
Wear safety glasses and work gloves, and follow all
safety codes. Use a quenching cloth and have a fire
extinguisher available for all brazing operations.
INSPECTION
As soon as a unit is received, it should be inspected for
possible damage during transit. If damage is evident,
the extent of the damage should be noted on the car-
rier's freight bill. A separate request for inspection by
the carrier's agent should be made in writing.
REFERENCE
Additional information on the design, installation, oper-
ation and service of this equipment is available in the
following reference forms:
• Technical Guide - 262256
• General Installation - 175245
RENEWAL PARTS
Contact your local York®Parts Distribution Center for
authorized replacement parts.
APPROVALS
Design certified by CSA as follows:
• For use as a heat pump only with or without
optional electric heat.
• For outdoor installation only.
• For installation on combustible material.
Installer should pay particular attention to the words:
NOTE, CAUTION and WARNING. Notes are intended
to clarify or make the installation easier. Cautions are
given to prevent equipment damage. Warnings are
given to alert installer that personal injury and/or equip-
ment damage may result if installation procedure is not
handled properly.
This product must be installed in strict compli-
ance with the enclosed installation instructions
and any applicable local, state, and national
codes including, but not limited to, building,
electrical, and mechanical codes.
Improper installation may create a condition
where the operation of the product could cause
personal injury or property damage.

175245-YIM-C-1008
Johnson Controls Unitary Products 5
PRODUCT NOMENCLATURE
B Q 240 C00 A 7 A AA 1 0 1 2 4 A
Product Category
B = HP, Single Pkg., R-22
Airflow
1 = First Generation
Product Generation
2 = Second Generation
C00 = Cooling Only. No field installed
electric heat
Heat Type and Nominal Heat Capacity
E18 = 18 KW
E36 = 36 KW
E54 = 54 KW
E72 = 72 KW
Electric Heat Options
Nominal Cooling Capacity
240 = 20 Ton
Product Identifier
Q = 9.0-10.0 EER HP
Voltage
7 = 380/415-3-50
Product Style
A = Style A
A = No Options Installed
Installation Options
B = Option 1
C = Option 2
D = Options 1 & 2
E = Option 3
F = Option 4
G = Options 1 & 3
H = Options 1 & 4
J = Options 1, 2 & 3
K = Options 1, 2, & 4
L = Options 1,3 & 4
M = Options 1, 2, 3, & 4
N = Options 2 & 3
P = Options 2 & 4
Q = Options 2, 3, & 4
R = Options 3 & 4
S = Option 5
T = Options 1 & 5
U = Options 1, 3, & 5
V = Options 1, 4, & 5
W = Options 1, 3, 4, & 5
X = Options 3 & 5
Y = Options 4 & 5
Z = Options 3, 4 & 5
1 = Disconnect
2 = Non-Pwr'd Conv. Outlet
3 = Smoke Detector S.A.
4 = Smoke Detector R.A.
5 = Pwr'd Conv. Outlet
Options
SS Drain Pan
Configuration Options (not required for all units)
These four digits will not be assigned until a quote is requested, or an order placed.
CPC Controller, DFS, APS
Johnson Controller, DFS, APS
Honeywell Controller, DFS, APS
Novar Controller, DFS, APS
Simplicity IntelliComfort Controller
Simplicity IntelliComfort Controller w/ModLinc
2" Pleated filters
4" Pleated filters
BAS Ready Economizer (2-10 V.D.C. Actuator Without a Controller)
Double Wall Construction
Any Combination of Additional Options that Don’t Have an Option Code Pre-assigned
AA = None
Standard Cabinet
AB = Phase Monitor
AC = Coil Guard
AD = Dirty Filter Switch
AE = Phase Monitor & Coil Guard
AF = Phase Monitor & Dirty Filter Switch
AG = Coil Guard & Dirty Filter Switch
AH = Phase Monitor, Coil Guard & Dirty Filter Switch
RC = Coil Guard & American Flag
TA = Technicoat Condenser Coil
TJ = Technicoat Evaporator Coil
TS = Technicoat Evaporator & Condenser Coils
BA = Hinged Filter Door & Tool Free Access Panels
Additional Options
Hinged Filter Door & Tool Free Access Cabinet
BB = Phase Monitor, Hinged Filter Door & Tool Free
Access Panels
BC = Coil Guard, Hinged Filter Door & Tool Free
Access Panels
BD = Dirty Filter Switch, Hinged Filter Door &
Tool Free Access Panels
BE = Phase Monitor & Coil Guard, Hinged Filter
Door & Tool Free Access Panels
BF = Phase Monitor & Dirty Filter Switch, Hinged
Filter Door & Tool Free Access Panels
BG = Coil Guard & Dirty Filter Switch, Hinged Filter
Door & Tool Free Access Panels
BH = Phase Monitor, Coil Guard & Dirty Filter Switch,
Hinged Filter Door & Tool Free Access Panels
20 Ton Sunline 2000™ Model Number Nomenclature
ZZ = If desired option combination is not listed above, ZZ will be assigned and configuration options will be
located in digits 15-18.
A = Std. Motor
B = Std. Motor/Economizer
C = Std. Motor/Economizer/Power Exhaust
(Downflow Only)
D = Std. Motor/Motorized Damper
E = Std. Motor/Motorized Damper/Barometric Relief
J = Std. Motor/Economizer/Barometric Relief
N = Hi Static
P = Hi Static/Economizer
Q = Hi Static/Economizer/Power Exhaust
(Downflow Only)
R = Hi Static/Motorized Damper
K = Hi Static/Motorized Damper/Barometric Relief
S = Hi Static/Economizer/Barometric Relief

175245-YIM-C-1008
6Johnson Controls Unitary Products
INSTALLATION
INSTALLATION SAFETY INFORMATION:
Read these instructions before continuing this appli-
ance installation. This is an outdoor combination heat-
ing and cooling unit. The installer must assure that
these instructions are made available to the consumer
and with instructions to retain them for future reference.
1. Install this furnace only in a location and position
as specified on Page 6 of these instructions.
2. This equipment is not to be used for temporary
heating of buildings or structures under construc-
tion.
LIMITATIONS
These units must be installed in accordance with the
following national and local safety codes:
In U.S.A.:
• National Electrical Code ANSI/NFPA No. 70.
• Local gas utility requirements.
In Canada:
• Current Canadian Electrical Code C22.1.
• Local plumbing and waste water codes.
• Other applicable local codes.
Refer to the Unit Application Data table and to the Elec-
tric Heat Application Data table.
If components are to be added to a unit to meet local
codes, they are to be installed at the dealer's and/or
the customer's expense.
Size of unit for proposed installation should be based
on heat loss/heat gain calculation made according to
the methods of the Air Conditioning Contractors of
America (ACCA).
This furnace is not to be used for temporary heating of
buildings or structures under construction.
LOCATION
Use the following guidelines to select a suitable loca-
tion for these units.
1. Unit is designed for outdoor installation only.
2. Condenser coils must have an unlimited supply of
air.
3. Where a choice of location is possible, position the
unit on either north or east side of building.
4. For ground level installation, use a level concrete
slab with a minimum thickness of 4 inches. The
length and width should be at least 6 inches
greater than the unit base rails. Do not tie slab to
the building foundation.
5. Roof structures must be able to support the weight
of the unit and its options and/or accessories. Unit
must be installed on a solid level roof curb or
appropriate angle iron frame.
The Simplicity ® control board used in this
product will effectively operate the cooling
system down to 0°F when this product is applied
in a comfort cooling application for people. An
economizer is typically included in this type of
application. When applying this product for
process cooling applications (computer rooms,
switchgear, etc.), please reference applications
bulletin AE-011-07 or call the applications
department for Unitary Products @ 1-877-UPG-
SERV for guidance. Additional accessories may
be needed for stable operation at temperatures
below 30°F.
TABLE 1: UNIT APPLICATION DATA
UNIT MODEL NUMBER BQ240
Voltage Variation,
Min. / Max.1
1. Utilization range “A” in accordance with ARI Standard
110.
208/230-3-60 187 / 253
460-3-60 414 / 506
575-3-60 518 / 630
Supply Air CFM, Min. / Max. 6,000 / 9,300
Wet Bulb Temperature (°F) of Air on
Evaporator Coil, Min. / Max. 57 / 72
Dry Bulb Temperature (°F) of Air on
Condenser Coil, Min. / Max. 0 / 120

175245-YIM-C-1008
Johnson Controls Unitary Products 7
6. Maintain level tolerance to 1/2 inch maximum
across the entire length or width of the unit.
If a unit is to be installed on a roof curb or special frame
other than a YORK®roof curb, gasketing must be
applied to all surfaces that come in contact with the unit
underside.
RIGGING AND HANDLING
Exercise care when moving the unit. Do not remove
any packaging until the unit is near the place of installa-
tion. Rig the unit by attaching chain or cable slings to
the round lifting holes provided in the base rails.
Spreaders, whose length exceeds the largest dimen-
sion across the unit, MUST BE USED. Refer to
Figure 1.
Units may also be moved or lifted with a forklift, from
the side only, providing that an accessory skid is used.
LENGTH OF FORKS MUST BE A MINIMUM OF 90".
Refer to the Physical Data Table 5 for unit weights and
to Figures 2 or 9 for approximate center of gravity.
CLEARANCES
All units require certain clearances for proper operation
and service. Installer must make provisions for ade-
quate ventilation air. Refer to Unit Dimensions
Figure 10 and Minimum Clearances Table 11 for the
clearances required for combustible construction, ser-
vicing, and proper unit operation.
DUCTWORK
Ductwork should be designed and sized according to
the methods in Manual Q of the Air Conditioning Con-
tractors of America (ACCA).
A closed return duct system shall be used. This shall
not preclude use of economizers or outdoor fresh air
intake. The supply and return air duct connections at
the unit should be made with flexible joints to minimize
noise.
Before lifting a unit, make sure that all panels
are in place and that its weight is distributed
equally on all cables so it will lift evenly.
FIGURE 1 - TYPICAL RIGGING
C A U T I O N :
B E F O R E L I F T I N G U N I T ,
M A K E S U R E T H A T I T S
W I D T H I S D I S T R I B U T E D
E Q U A L L Y O N T H E C A B L E S
S O T H A T I T W I L L L I F T
E V E N L Y
L I F T I N G
H O L E S
SPREADER
BAR
FIGURE 2 - CENTER OF GRAVITY
Do not permit overhanging structures or shrubs
to obstruct outdoor air discharge outlet, com-
bustion air inlet or vent outlets.

175245-YIM-C-1008
8Johnson Controls Unitary Products
The supply and return air duct systems should be
designed for the CFM and static requirements of the
job. They should NOT be sized to match the dimen-
sions of the duct connections on the unit.
Refer to Unit Dimensions Figures 10 and 11 for infor-
mation concerning side and bottom supply and return
air duct openings.
FIXED OUTDOOR AIR INTAKE DAMPER
This damper is shipped inside the return air compart-
ment. It is completely assembled and ready for installa-
tion. A damper baffle inside of the hood is adjustable to
provide variable amounts of outdoor air intake on units
that are not provided with an economizer or a motor-
ized damper option. Refer to the Fixed Outdoor
Damper Figure 3.
Gasketing and mounting screws are provided in a parts
bag attached to the hood assembly. Apply gasketing to
the three flange surfaces on the hood prior to installing
the hood. Extend gasketing 1/4 inch beyond the top
and bottom of the two side flanges to insure adequate
sealing.
Adjusting the damper to the desired air flow may be
done before mounting the hood into position or after
installation by removing the front hood panel or the
screen on the bottom of the hood. Damper baffle in
position 1 will allow approximately 10% outdoor air
flow, position 2 approximately 15% and, to allow
approximately 25%, remove the damper baffle.
On units with bottom return air application install the
damper assembly over the opening in the side return
air access panel. Remove and discard the opening
cover and the covering over the hood mounting holes
(used for shipping) before installing. Secure with the
screws provided.
On units with side return air applications, install the
damper assembly on the return air ductwork as close
to the unit as possible. Cut an opening 16 inches high
by 18 inches wide in the ductwork to accommodate the
damper. Using the holes in the hood flanges as a tem-
plate, drill 9/64 inch dia. (#26 drill) holes into the duct-
work and secure with the screws provided.
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate
drain line from the one-inch NPT female connection on
the unit to an open drain.
NOTE: The condensate drain operates in a negative
pressure in the cabinet. The condensate drain
line MUST be trapped to provide proper drain-
age. See Figure 4.
When fastening ductwork to side duct flanges
on unit, insert screws through duct flanges
only. DO NOT insert screws through casing.
Outdoor ductwork must be insulated and
waterproofed.
If outdoor air intake will not be required on
units with bottom return air applications, the
damper assembly should still be mounted on
the side return air access panel, per the
instructions above, to insure moisture is not
drawn into the unit during operation. The cov-
ering over the mounting holes only need be
removed. Do not remove the opening cover.
FIGURE 3 - FIXED OUTDOOR AIR DAMPER

175245-YIM-C-1008
Johnson Controls Unitary Products 9
COMPRESSORS
Units are shipped with compressor mountings factory-
adjusted and ready for operation.
FILTERS
Two-inch or four-inch filters can be supplied with each
unit. Filters must always be installed ahead of the
evaporator coil and must be kept clean or replaced with
same size and type. Dirty filters will reduce the capacity
of the unit and will result in frosted coils or safety shut-
down. Minimum filter area and required sizes are
shown in Physical Data Table 5.
SERVICE ACCESS
The following removable panels provide access to all
serviceable components:
• Compressor compartment
• Electric Heat compartment
• Side Supply & Return Air compartments
(Two panels)
• Blower compartment (Three panels)
• Main control box
• Filter compartment
• Outdoor Air compartment (Two panels)
Refer to the Unit Dimensions Figures 10 and 11 for
location of these access panels.
FIGURE 4 - RECOMMENDED DRAIN PIPING
Do not loosen compressor mounting bolts.
Make sure that all screws and panel latches
are replaced and properly positioned on the
unit to maintain an airtight seal.

175245-YIM-C-1008
10 Johnson Controls Unitary Products
FIGURE 5 - TYPICAL FIELD WIRING
W2
RC
RH
Y1
Y2
W1
G
C
X1
X3
X4
A1
A2
T
T
W2
Y1
Y2
W1
G
C
OCC
X
R
THERMOSTAT
1
TERMINALS UNIT CONTROL
BOARD
1
ElectronicprogrammableThermostat2ET0770010024(includessubbase).
2

TerminalsA1andA2providearelayoutput toclosetheoutdoor
economizerdamperswhenthethermostatswitchestotheset-backposition

.
24Volt
Transformer
2
TOREMOTESENSOR
2ET04701324IFUSED

The thermostat must provide a “G” sig-
nal when there is a call for “W1.”The
unit control board will energize the
indoor blower when the compressors
are energized; however, if the thermo-
stat calls for “W2” during the anti-short-
cycle delay, the electric heat (when
installed) will be energized immediately
upon the call for “W2.”
O C C
W 1
W 2
Y 1
G
Y 2
X
R
S D
C
R E M O T E
M I N P O S
W 1
W 2
Y 1
G
Y 2
C
U N I T C O N T R O L
B O A R D
T - S T A T
R H
R C
  







  
 
208/230-3-60 and 380/415-3-50 units con-
trol transformers are factory wired for 230v
and 415v power supply respectively.
Change tap on transformer for 208-3-60 or
380-3-50 operation.
See unit wiring diagram.

175245-YIM-C-1008
Johnson Controls Unitary Products 11
THERMOSTAT
The room thermostat should be located on an inside
wall approximately 56 inches above the floor where it
will not be subject to drafts, sun exposure or heat from
electrical fixtures or appliances. Follow manufacturer's
instructions enclosed with thermostat for general instal-
lation procedure. A minimum of seven color-coded
insulated wires (#18 AWG) should be used to connect
thermostat to unit.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of
the National Electrical Code, ANSI / NFPA No. 70 (in
U.S.A.), current Canadian Electrical Code C22.1 (in
Canada) and/or local ordinances. The unit must be
electrically grounded in accordance with NEC and CEC
(as specified above) and/or local codes. Voltage toler-
ances, which must be maintained at the compressor
terminals, during starting and running conditions, are
indicated on the unit Rating Plate and the Unit Applica-
tion Data table.
The internal wiring harness furnished with this unit is
an integral part of a CSA design certified unit. Field
alteration to comply with electrical codes should not be
required.
A fused disconnect switch should be field provided for
the unit. The switch must be separate from all other cir-
cuits. Wire entry at knockout openings require conduit
fittings to comply with NEC (in U.S.A.), CEC (in Can-
ada) and/or local codes. Refer to the Unit Dimensions
Figure 10 and Utilities Entry Data Table 12 for installa-
tion location. If any of the wire supplied with the unit
must be replaced, replacement wire must be of the
type shown on the wiring diagram and the same mini-
mum gauge as the replaced wire.
Electrical line must be sized properly to carry the load.
Use copper conductors only. Each unit must be wired
with a separate branch circuit fed directly from the
meter panel and properly fused.
Refer to the Typical Field Wiring Figure 5 and to the
appropriate unit wiring diagram for control circuit and
power wiring information.
OPTIONAL ELECTRIC HEAT
The factory-installed heaters are wired for single point
power supply. Power supply need only be brought into
the single point terminal block and thermostat wiring to
the low voltage terminal strip located in the upper por-
tion of the unit control box.
These CSA approved heaters are located within the
central compartment of the unit with the heater ele-
ments extending into the supply air chamber. Refer to
Figure 10 for access panel location.
Fuses are supplied, where required, by the factory.
Some KW sizes require fuses and others do not. Refer
to Table 3 for minimum CFM limitations and to Tables
7, 8 and 9 for electrical data.
208/230-3-60 and 380/415-3-50 units control
transformers are factory wired for 230v and
415v power supply respectively. Change tap
on transformer for 208-3-60 or 380-3-50
operation.
See unit wiring diagram.
When connecting electrical power and control
wiring to the unit, waterproof type connectors
MUST BE USED so that water or moisture
cannot be drawn into the unit during normal
operation. The above waterproofing conditions
will also apply when installing a field-supplied
disconnect switch.
TABLE 2: CONTROL WIRE SIZES
Wire Size Maximum Length1
1. From the unit to the thermostat and back to the unit.
18 AWG 150 Feet

175245-YIM-C-1008
12 Johnson Controls Unitary Products
OPTIONAL ECONOMIZER/MOTORIZED DAMPER RAIN
HOOD
The instruction for the optional economizer/motorized
damper rain hood can be found in the kit. Use these
instructions when field assembling an economizer rain
hood onto a unit. The outdoor and return air dampers,
the damper actuator, the damper linkage, the outdoor
and return air divider baffles, and all the control sen-
sors are factory mounted as part of the "Factory
installed" economizer option.
OPTIONAL POWER EXHAUST/BAROMETRIC RELIEF
DAMPER RAIN HOOD
The instructions for the power exhaust/barometric relief
damper rain hood can be found in the kit. The exhaust
fan, all supporting brackets, angles, and the wiring are
factory installed as part of the power exhaust option.
OPTIONAL ECONOMIZER AND POWER EXHAUST
DAMPER SET POINT ADJUSTMENTS AND INFORMA-
TION
Remove the economizer access panel from the unit.
Loosen but do not remove the two panel latches.
Locate the economizer control module, where the fol-
lowing adjustments will be made.
Check that the damper blades move smoothly without
binding; carefully turn the Minimum Position Adjusting
screw (found on the damper control module) fully
clockwise and then set the thermostat indoor fan switch
to the on position and then off, or energize and de-
energize terminals "R" to "G".
MINIMUM POSITION ADJUSTMENT
With thermostat set to indoor fan on position, or
terminals "R" to "G" energized, turn the Minimum
Position Adjusting screw (located on the damper
control module) counterclockwise until the desired
minimum damper position has been attained.
ENTHALPY SET POINT ADJUSTMENT
The enthalpy set point may now be set by selecting the
desired setpoint shown in the Enthalpy Setpoint Adjust-
ment Figure 6. Adjust as follows:
• For a single enthalpy operation carefully turn the
set point adjusting screw (found on the damper
control module) to the "A", "B", "C" or "D" setting
corresponding to the lettered curve of the Enthalpy
Setpoint Adjustment Figure 6.
• For a dual enthalpy operation, carefully turn the set
point adjusting screw fully clockwise past the "D"
setting.
POWER EXHAUST DAMPER SETPOINT
With power exhaust option, each building pressuriza-
tion requirement will be different. The point at which the
power exhaust comes on is determined by the econo-
mizer damper position (Percent Open). The Exhaust
Air Adjustment Screw should be set at the Percent
Open of the economizer damper at which the power
exhaust is needed. It can be set from 0 to 100%
damper open.
INDOOR AIR QUALITY AQ
Indoor Air quality (indoor sensor input): Terminal AQ
accepts a +2 to +10 Vdc signal with respect to the
(AQ1) terminal. When the signal is below it's setpoint,
the actuator is allowed to modulate normally in
accordance with the enthalpy and mixed air sensor
inputs. When the AQ signal exceeds it's setpoint
setting and there is no call for free cooling, the actuator
is proportionately modulated from the 2 to 10 Vdc
signal, with 2 Vdc corresponding to full closed and 10
Vdc corresponding to full open. When there is no call
for free cooling, the damper position is limited by the
IAQ Max damper position setting. When the signal
exceeds it's setpoint (Demand Control Ventilation
Setpoint) setting and there is a call for free cooling, the
actuator modulates from the minimum position to the
full open position based on the highest call from either
the mixed air sensor input or the AQ voltage input.
TABLE 3: ELECTRIC HEAT APPLICATION DATA
NOMINAL
HEATER SIZE
(KW)
VOLTAGE
3-PHASE,
60 HZ
MINIMUM CFM UNIT SIZE
20 TON
18 208/230,460,575
6000
36 208/230,460,575
54 208/230
460,575
72 208/230
460,575
Extreme care must be exercised in turning all
setpoint, maximum, and minimum damper
positioning adjustment screws to prevent twist-
ing them off.

175245-YIM-C-1008
Johnson Controls Unitary Products 13
• Optional CO
2Space Sensor Kit Part #
2AQ04700324
• Optional CO
2Unit Sensor Kit Part # 2AQ04700424
Replace the economizer access panel.
OPTIONAL BAS-READY ECONOMIZER POWER
EXHAUST DAMPER SET POINT ADJUSTMENT
Remove the economizer access panel from the unit.
Loosen, but do not remove the two panel latches.
Locate the economizer actuator, where the following
adjustment can be made.
With power exhaust option, each building pressuriza-
tion requirement will be different. The point at which the
power exhaust comes on is determined by the econo-
mizer's outdoor damper position. The actuator's auxil-
iary switch adjustment screw should be set at the
damper position at which the power exhaust is needed.
The adjustment screw can be set between 25 to 85
degrees open.
Replace the economizer access panel.
FIGURE 6 - ENTHALPY SETPOINT ADJUSTMENT

175245-YIM-C-1008
14 Johnson Controls Unitary Products
FIGURE 7 - HONEYWELL ECONOMIZER CONTROL W7212
N1 N
P1 P
EXH
Set
EXH
Min
Pos
IAQ
Max
IAQ
IAQ
Min
Free
Cool
T
T1
AQ1 AQ
SO+ SO
SR+ SR
A
BC
D
TR TR1
24
Vac
HOT
24
Vac
COM
EF EF1
2
34
5
1
+
Exhaust Air
Adjustment
Screw
Exhaust Air LED
Damper Min.
Position
Screw
Indoor Air Quality
Max. Adjustment
Screw
Indoor Air Quality
LED
Indoor Air Quality
Min. Adjustment
Screw
Free Cooling LED
Economizer Enthalpy
Set Point Adjustment
Screw
FIGURE 8 - FOUR AND SIX POINT LOADS
A
B
C
D
FRONT
A
E
D
B
F
C
FRONT
TABLE 4: FOUR AND SIX POINT LOADS
UNIT 4 - POINT LOADS (LBS)
TOTAL ABCD
240 2340 504 641 669 526
NOTE: These weights are with economizer and 72 kW electric heat.
UNIT 6 - POINT LOADS (LBS)
TOTAL ABCDEF
240 2340 336 351 398 446 427 382
NOTE: These weights are with economizer and 72 kW electric heat.

175245-YIM-C-1008
Johnson Controls Unitary Products 15
FIGURE 9 - CENTER OF GRAVITY
TABLE 5: PHYSICAL DATA - BASIC UNIT
MODEL BQ240
SUPPLY AIR
BLOWER
CENTRIFUGAL BLOWER (Dia. x Wd. in.) 18 x 15
FAN MOTOR HP 7.5
INDOOR COIL
ROWS DEEP 4
FINS PER INCH 15
FACE AREA (Sq. Ft.) 20.5
OUTDOOR
FAN
(Two Per Unit)
PROPELLER DIA. (in.) (Each) 30
FAN MOTOR HP (Each) 1.25
NOM. CFM TOTAL (Each) 7200
OUTDOOR COIL
ROWS DEEP 3
FINS PER INCH 15
FACE AREA (Sq. Ft.) 43.3
COMPRESSOR
(Qty. Per Unit) SCROLL 2
AIR
FILTERS
QUANTITY PER UNIT (16" X 20" X 2") 4
QUANTITY PER UNIT (16" X 25" X 2") 4
TOTAL FACE AREA (sq. ft.) 20.0
CHARGE REFRIGERANT 22
(lbs./oz.)
SYSTEM NO. 1 25/8
SYSTEM NO. 2 25/0
TABLE 6: OPERATING WEIGHTS (LBS.)
MODEL BQ240
Basic Unit BQ (Heat Pump) 2050
Options
Economizer 250
Economizer with Power Exhaust 335
Motorized Damper 150
Electric Heater
18 KW 25
36 KW 30
54 KW 35
72 KW 40
Accessories
Roof Curb 185
Barometric Damper 45
Wood Skid 220

175245-YIM-C-1008
16 Johnson Controls Unitary Products
Note 1: Maximum HACR breaker of the same amp size is acceptable.
Note 2: Only 18kW of the 36 or 54kW, or only 36kW of the 72kW electric heat can be simultaneously energized with the mechanical
heating. The full heater kW operates only if both compressors are locked out.
TABLE 7: VOLTAGE LIMITATIONS
POWER SUPPLY VOLTAGE
MIN. MAX.
208/230-3-60 187 253
460-3-60 414 506
575-3-60 518 630
TABLE 8: ELECTRICAL DATA -WITHOUT POWERED CONVENIENCE OUTLET
MODEL
(TON-
NAGE) VOLTAGE
COMPRESSORS OD FAN
MOTORS
FLA EACH
ID
BLOWER
MOTOR
FLA
CONV
OUTLET
AMPS
HEATER OPTION MIN.
CIRCUIT
AMPACITY
(AMPS)
MAX.
FUSE/
BRKR1
SIZE
(AMPS)
RLA
EACH LRA EACH MODEL KW2STAGES AMPS
BQ240
(20)
208 30.1 225 3.7 21.7 0.0
- 0.0 - - 96.8 125
E18 13.5 1 37.5 143.7 150
E36 27.0 2 74.9 143.7 150
E54 40.6 2 112.7 168.0 175
E72 54.1 2 150.2 190.5 200
230 30.1 225 3.7 20.0 0.0
- 0.0 - - 95.1 125
E18 18.0 1 43.3 149.3 150
E36 36.0 2 86.6 149.3 150
E54 54.0 2 129.9 154.9 175
E72 72.0 2 173.2 203.4 225
460 15.5 114 1.9 10.0 0.0
- 0.0 - - 48.7 60
E18 18.0 1 21.7 75.7 80
E36 36.0 2 43.3 75.7 80
E54 54.0 2 65.0 77.5 90
E72 72.0 2 86.6 102.8 110
575 12.1 80 1.5 8.0 0.0
- 0.0 - - 38.2 50
E18 18.0 1 17.3 59.9 60
E36 36.0 2 34.6 59.9 60
E54 54.0 2 52.0 62.0 70
E72 72.0 2 69.3 81.5 90

175245-YIM-C-1008
Johnson Controls Unitary Products 17
Note 1: Maximum HACR breaker of the same amp size is acceptable.
Note 2: Only 18kW of the 36 or 54kW, or only 36kW of the 72kW electric heat can be simultaneously energized with the mechanical
heating. The full heater kW operates only if both compressors are locked out.
TABLE 9: ELECTRICAL DATA -WITH POWERED CONVENIENCE OUTLET
MODEL
(TON-
NAGE) VOLTAGE
COMPRESSORS OD FAN
MOTORS
FLA EACH
ID
BLOWER
MOTOR
FLA
CONV
OUTLET
AMPS
HEATER OPTION MIN.
CIRCUIT
AMPACITY
(AMPS)
MAX.
FUSE/
BRKR1
SIZE
(AMPS)
RLA
EACH LRA EACH MODEL KW2STAGES AMPS
BQ240
(20)
208 30.1 225 3.7 21.7 10.0
- 0.0 - - 106.8 125
E18 13.5 1 37.5 153.7 175
E36 27.0 2 74.9 153.7 175
E54 40.6 2 112.7 180.5 200
E72 54.1 2 150.2 200.5 225
230 30.1 225 3.7 20.0 10.0
- 0.0 - - 105.1 125
E18 18.0 1 43.3 159.3 175
E36 36.0 2 86.6 159.3 175
E54 54.0 2 129.9 167.4 175
E72 72.0 2 173.2 213.4 225
460 15.5 114 1.9 10.0 5.0
-0.0 - - 53.7 60
E18 18.0 1 21.7 80.7 90
E36 36.0 2 43.3 80.7 90
E54 54.0 2 65.0 83.7 90
E72 72.0 2 86.6 107.8 110
575 12.1 80 1.5 8.0 4.0
-0.0 - - 42.2 50
E18 18.0 1 17.3 63.9 70
E36 36.0 2 34.6 63.9 70
E54 54.0 2 52.0 67.0 70
E72 72.0 2 69.3 85.5 90
TABLE 10: ELECTRIC HEAT CORRECTION FACTORS
NOMINAL VOLTAGE VOLTAGE KW CAP. MULTIPLIER
208 208 1.00
240 230 0.92
480 460 0.92
600 575 0.92

175245-YIM-C-1008
18 Johnson Controls Unitary Products
NOTE: Units and ductwork are approved for zero clearance to
combustible materials when equipped with electric heat-
ers.
NOTE: All entry holes should be field sealed to prevent rain
water entry into building.
FIGURE 10 - UNIT DIMENSIONS - 20 TON
RETURN
AIR
SUPPLY
AIR
BOTTOM SUPPLY
AND RETURN
AIR OPENINGS
(See Note)
(B)
POWER WIRING
ENTRY
(A)
CONTROL WIRING
ENTRY
NOTE:
For curb mounted units, refer to the curb hanger
dimensions of the curb for the proper size of the
supply and return air duct connections.
UNIT BASE WITH RAILS
Shown separately to illustrate
Bottom Duct openings and Power
Connection locations
12-1/2"
9-1/4"
8-1/8"
9-3/4"
3-3/4"
(B)
POWER WIRING
ENTRY
(A)
CONTROL WIRING
ENTRY
92"
CONDENSER
COILS
OPTIONAL COIL
GUARD KIT
52-5/8" (20 TON)
COMPRESSOR
ACCESS
(See detail "X")
ECONOMIZER / MOTORIZED DAMPER,
FIXED OUTDOOR INTAKE AIR AND
POWER EXHAUST RAIN HOODS
(See detail "Y")
FIELD-SUPPLIED
DISCONNECT SWITCH
LOCATION
BLOWER
ACCESS
BLOWER MOTOR
ACCESS
BLOWER
COMPARTMENT
ACCESS
(Auxiliary)
DOT PLUG
(For pressure
Drop Reading)
FRONT
VIEW ELECTRIC HEAT
ACCESS
CONTROL BOX
ACCESS
136-1/4" (20 TON)
21"
5"
9-3/4"
11-1/2"
2-3/4" 21-1/2"
33"
35"
5-7/8"
35-1/4" (20 TON)
RETURN AIR
SUPPLY AIR
OUTDOOR A IR
OUTDOOR A IR
(Economizer)
TABLE 11: MINIMUM CLEARANCES
LOCATION CLEARANCE
Front 36”
Back 24” (Less Economizer)
49” (With Economizer
Left Side (Filter Access) 24” (Less Economizer)
36” (With Economizer)
1
1. If economizer is factory installed, the unassembled
rainhood must be removed from its ride along position
in front of evaporator coil, or in the outdoor air compart-
ment, prior to final installation.
Right Side (Cond. Coil) 36”
Below Unit2
2. Units (applicable in U.S.A. only) may be installed on
combustible floors made from wood or class A, B or C
roof covering material.
0”
Above Unit3
3. Units must be installed outdoors. Overhanging struc-
tures or shrubs should not obstruct outdoor air dis-
charge outlet.
72” With 36” Maximum
Horizontal Overhang (For
Condenser Air Discharge)
TABLE 12: UTILITIES ENTRY DATA
HOLE OPENING SIZE (DIA.) USED FOR
A1-1/8” KO Control Wiring Front
3/4” NPS (Fem.) Bottom
B3-5/8” KO Power Wiring Front
3” NPS (Fem.) Bottom

175245-YIM-C-1008
Johnson Controls Unitary Products 19
FIGURE 11 - REAR VIEW DIMENSIONS
NOTE: Units are shipped with the bottom duct open-
ings covered. An accessory flange kit is avail-
able for connecting side ducts.
For bottom duct applications:
1. Remove the side panels from the supply and return air
compartments to gain access to the bottom supply and
return air duct covers.
2. Remove and discard the bottom duct covers. Duct
openings are closed with sheet metal covers except
when the unit includes a power exhaust option. The
covering consists of a heavy black paper composition.
3. Replace the side supply and return air compartment
panels.
For side duct applications:
1. Replace the side panels on the supply and return air
compartments with the side duct flange accessory kit
panels.
2. Connect ductwork to the flanges on those panels.
FIGURE 12 - UNIT WITH RAIN HOOD DIMENSIONS (20 TON)
SUPPLY
AIR
RETURN
AIR
OUTDOOR
AIR
5-1/8"
18-5/8"
27-3/4"
39-5/8"
40-1/2"
OUTDOOR AIR
COMPARTMENT
ACCESS
FILTER
ACCESS
1" NPT FEMALE
COND. DRAIN
CONNECTION
DOT PLUG
(For pressure
drop reading)
EVAPORATOR
SECTION
40-3/8"
COMPRESSOR
ACCESS
SUPPLY AIR
ACCESS
RETURN AIR
ACCESS
REAR
VIEW
Dimensions listed are for side
duct flange openings; see
Field Accessories for Side
Duct Flange Kit.
REAR VIEW
DETAIL “Y”
UNIT WITH RAIN HOODS
LH VIEW
28-3/16” 92”
36-5/8”
5”
16-1/8”
SUPPLY AIR
COMPARTMENT
POWER EXHAUST
RAIN HOOD
(on Return Air Compartment)
ECONOMIZER
MOTORIZED
DAMPER
RAIN HOOD
(on Outdoor Air Compartment) ECONOMIZER / MOTORIZED DAMPER
AND POWER EXHAUST RAIN HOODS
FIXED
OUTDOOR AIR
INTAKE HOOD
(located on
Return Air
Compartment)
1“ CONDENSATE
DRAIN
(Must be trapped)

175245-YIM-C-1008
20 Johnson Controls Unitary Products
CFM, STATIC PRESSURE, AND POWER - ALTI-
TUDE AND TEMPERATURE CORRECTIONS
The information below should be used to assist in application
of product when being applied at altitudes at or exceeding
1000 feet above sea level.
The air flow rates listed in the standard blower performance
tables are based on standard air at sea level. As the altitude
or temperature increases, the density of air decreases. In
order to use the indoor blower tables for high altitude applica-
tions, certain corrections are necessary.
A centrifugal fan is a "constant volume" device. This means
that, if the rpm remains constant, the CFM delivered is the
same regardless of the density of the air. However, since the
air at high altitude is less dense, less static pressure will be
generated and less power will be required than a similar
application at sea level. Air density correction factors are
shown in Table 13 and Figure 13.
The examples below will assist in determining the airflow per-
formance of the product at altitude.
Example 1: What are the corrected CFM, static pressure,
and BHP at an elevation of 5,000 ft. if the blower performance
data is 6,000 CFM, 1.5 IWC and 4.0 BHP?
Solution: At an elevation of 5,000 ft the indoor blower will still
deliver 6,000 CFM if the rpm is unchanged. However, Table
13 must be used to determine the static pressure and BHP.
Since no temperature data is given, we will assume an air
temperature of 70°F. Table 13 shows the correction factor to
be 0.832.
Corrected static pressure = 1.5 x 0.832 = 1.248 IWC
Corrected BHP = 4.0 x 0.832 = 3.328
Example 2: A system, located at 5,000 feet of elevation, is to
deliver 6,000 CFM at a static pressure of 1.5". Use the unit
blower tables to select the blower speed and the BHP
requirement.
Solution: As in the example above, no temperature informa-
tion is given so 70°F is assumed.
The 1.5" static pressure given is at an elevation of 5,000 ft.
The first step is to convert this static pressure to equivalent
sea level conditions.
Sea level static pressure = 1.5 / .832 = 1.80"
Enter the blower table at 6000 sCFM and static pressure of
1.8". The rpm listed will be the same rpm needed at 5,000 ft.
Suppose that the corresponding BHP listed in the table is 3.2.
This value must be corrected for elevation.
BHP at 5,000 ft = 3.2 x .832 = 2.66
TABLE 13: ALTITUDE CORRECTION FACTORS
AIR TEMP ALTITUDE (FEET)
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
40 1.060 1.022 0.986 0.950 0.916 0.882 0.849 0.818 0.788 0.758 0.729
50 1.039 1.002 0.966 0.931 0.898 0.864 0.832 0.802 0.772 0.743 0.715
60 1.019 0.982 0.948 0.913 0.880 0.848 0.816 0.787 0.757 0.729 0.701
70 1.000 0.964 0.930 0.896 0.864 0.832 0.801 0.772 0.743 0.715 0.688
80 0.982 0.947 0.913 0.880 0.848 0.817 0.787 0.758 0.730 0.702 0.676
90 0.964 0.929 0.897 0.864 0.833 0.802 0.772 0.744 0.716 0.689 0.663
100 0.946 0.912 0.880 0.848 0.817 0.787 0.758 0.730 0.703 0.676 0.651