TO THE INSTALLER:
THIS ENVELOPE CONTAINS:
1. INSTALLATION/OPERATING INSTRUCTIONS
3. WARRANTY REGISTRATION CARD
4. WARRANTY REGISTRATION AND WARRANTY CLAIM LABEL
AFTER INSTALLATION, THE REGISTRATION CARD MUST BE COMI
AND RETURNED. AFFIX WARRANTY REGISTRATION LABELTO WA
REGISTRATION CARD. IF NO WARRANTY REGISTRATION CARD IS
WITH CES, WARRANTY COVERAGE WILL BEGIN ON THE DATE O
PRODUCT SHIPMENT FROM CES.
MAKE SURE THE WARRANTY AND ALL OTHER INSTRUCTIONS i
BACK INTO THIS ENVELOPE, THEN LOCATE IT IN A CONSPICU
PLACE, INDOORS, ACCESSIBLE TO THE CONSUMER.
TO THE CONSUMER:
YOUR "OWNER'S INFORMATION" IS IN THIS ENVELOPE KEEP
ALL OTHER INSTRUCTIONS ON THIS PRODUCT FOR FUTURE
WARRANTY REGISTRATION CARD
UNI \ 50.05-RC1 (386) 035-04004
NI Supersedes: 50.05-RC1 (984)
UNI DATE INSTALLED
I MONTH DAY YEAR
MODEL NO. N2AHD2OAO6A
SERIAL NO. 11KSS383894
OWNER'S NAME ,
H II IS ITli Si T.I Al Uj G UI SI TI IlN IE I I P RI E S4 B Dj
A 18 1 IK I -I N IGI'. i S TI | I I 1 I I I 1 1 I
S I Ti I A U GIUI S T I NJ El F1 LI | | | FIL
ZIP CODE DEALER NUMBER
3 1 210 18 4 I I I I I I I I1 I1 1 1
MIA IS T EI R S H TIG. &I Al Cl I I I I I I I I
IF NO WARRANTY REGISTRATION CARD IS ON FILE WITH CENTRAL
ENVIRONMENTAL SYSTEMS (CES), WARRANTY COVERAGE WILL
BEGIN ON THE DATE OF PRODUCT SHIPMENT FROM CES.
CENTRAL ENVIRONMENTAL SYSTEMS
P.O. BOX 1592 363A
YORK, PA 17405-1592
C, LL IL -I
MODEL NO. N2AHli20ni6A
SERIAL NO. MKSS383.94
MODEL NO. N2AHD20A06A
SERIAL NO. MKSS383894
MODEL NO. N2AHD20AO6A 0
SERIAL NO. MKSS383894 w
MODELS N2AHD06 THRU N2AHD20
Supersedes: 550.15-N2 (482)
I Tab NAH 550.15-N2Y (683)
AIR HANDLERS (STYLE B) SOLD IN CANADA HAVE EITHER A FAN RELAY ACCESSORY OR AN ELECTRIC
HEAT ACCESSORY INSTALLED IN THE UNIT. DISREGARD THE TRANSFORMER AND ELECTRICAL HEAT
ACCESSORY INFORMATION FURNISHED IN THIS FORM. I
This Air Handler can be installed invertical upflow, vertical
counterflow, and horizontal positions. The Air Handler is the
basic component of an indoor modular system which may
be combined with various accessories listed below to make
an electric furnace, evaporator blower, evaporator blower
with electric heat, heat pump blower, and heat pump with
This instruction should be used in conjunction with installa-
tion instructions supplied with each accessory as well as the
matching outdoor section.
ACCESSORIES FORM REQUIRED WHEN:
Transformer Relay 550.15-N2.5 electric heat is not used.
Electric Heater 550.15-N2.1 applicable.
Filter Rack 550.15-N2.2 applicable.
ThreenPoint 550.15-N2.3 applicable
Combustible-Floor Base 550.15-N2.7 applied counterflow
using electric heaters.
applied to cooling
applied to heat
These units should be wired and installed in accordance with
all national and local safety codes. See Table 1 for air flow
Voltage limits are as follows:
AIR HANDLER *NORMAL OPERATING
VOLTAGE VOLTAGE RANGE
208/230 (06) 187 253
460 (46) 432 504
*Utilization range "A" in accordance with ARI Std. 110.
INDOOR UNIT PREPARATION
Because of the many ways this Air Handler may be applied
and the large variety of available accessories, the indoor por-
tion of the cooling or heat pump system comes to you in
modules. These modules must be field assembled to meet
the specific needs of the owner.
Check modules (accessories, etc.) received, against initial
plans to be sure all required modules are available for
NOTE: The accessories listed under "GENERAL "may be
used as a check list.
Prepare Air Handler for installation as follows:
TABLE 1 AIR HANDLER UNIT AIR FLOW LIMITS
N2AHD14(* )06 N2AHD16 ( )06 N2AHD20( ) 06
MODEL N2AHD06 ( )06 N2AHD10 ( ) 06 14 ( ) 46 N2AHD16()46 N2AHD2()46
N2AHD14(* )46 N2AHD16( )46 N2AHD20(*)46
MINIMUM 320 675 925 1290 1600
MAXIMUM 765 1225 1680 1820 2300
( ) "A" indicates no electric heat installed at factory.
"D" or "E" followed by 3 digit number indicates electric heat factory installed and nominal KW value of heater.
1. Attach coil casing to Air Handler in a way appropriate to
indoor section's application. See Form 550.15-N3Y.
2. Attach accessories as required for the particular installation.
NOTE: Each accessory is provided with its own instruction.
3. Install Air Handler operating controls. A transformer-
relay accessory or an electric heater accessory with
transformer is supplied for the operation of the Air
Handler. Air Handlers and operating controls must be
combined as shown in table below:
TYPE OF SYSTEM OPERATING CONTROLS REQUIRED
Cooling Without Electric Heat 208/230-1-60
and Transformer Relay Kit
Heat Pump 2TT06700206
Cooling Without Electric Heat 460-1-60
and Transformer Relay Kit
Heat Pump 2TT01700146
Cooling With Electric Heat
and Add Electric Heat Accessory
See Fig. 1 and accessory instructions to position and install
4. For counterflow and horizontal applications, the fan
motor oilers must be rotated to near upright position to
facilitate proper oiling.
Location is usually predetermined. Check with owner's or
dealer's initial installation plans. If location has not been
decided, consider the following in choosing a suitable
1. The indoor section must be located to permit installation
of a trapped condensate line to an open drain, if coil
accessory is added to Air Handler.
2. For the indoor section, select a location with adequate
structural support, space for service access, clearance for
air return and discharge or duct connections.
NOTE: If unit is installed in an un-conditioned space,
insulate completely with 2" thick fiberglass with
vapor barrier on the outside.
3. Precautions should be taken to locate the unit and duct-
work so that supply air does not short circuit to the
4. Proper electrical supply must be available.
5. Clearances must also be taken into consideration, and
provided for as follows:
a. Maintenance and servicing thru the front or access
side of unit with both sides and rear of unit having
zero inch clearance.
b. When no electric heat is used, the unit as well as all
duct work and plenum are designed for zero clearance
to combustible material.
c. If Electric Heat is used or anticipated, be sure a mini-
mum clearance of one inch is allowed on all sides of
the supply air duct and plenum. This clearance must
be maintained up to 3 feet along the supply air duct.
When a discharge plenum forms part of the duct work, it too
must have one inch clearance on all sides.
Air supply and return may be handled in one of several
ways best suited to the installation. See Figure 1 for Air
Handler inlet and outlet dimensions.
NOTE: Inlet dimensions of Air Handler are the same as
coil casing outlet dimensions.
Duct work should be fabricated and installed in accordance
with local and/or national codes. This includes the standards
of the National Fire Protection Association for Installation
of Air-Conditioning and Ventilating Systems, NFPA No. 90A
and Warm Air Heating and Air Conditioning Systems, NFPA
The vast majority of problems encountered with combina-
tion heating and cooling systems can be linked to improperly
designed or installed duct systems. It is therefore highly im-
portant to the success of an installation that the duct system
be properly designed and installed.
On any job, non-flammable material should be used for the
return air and discharge connections to minimize transmission
of vibration. If Electric Heat is used the non-flammable ma-
terial must be used.
Where return air duct is short, or where sound is liable to be
a problem, sound absorbing glass fiber should be used inside
the duct. Insulation of duct work is a must where it runs
through an unheated space during the heating season or
through an uncooled space during the cooling season. The
use of a vapor barrier is recommended to prevent absorption
of moisture from the surrounding air into the insulation.
The supply air opening on the fan unit should be enlarged to
the proper duct size by use of a transition.
All ducts should be suspended using flexible hangers and
never fastened directly to the structure.
Copyright 1983 by Borg-Warner Central Environmental Systems, Inc. (BWCES) ALL RIGHTS RESERVED
TRANSFORMER RELAY 2TT06700206
(COOLING & HEAT PUMP WITHOUT
ELECTRIC HEATER 208/230 V)
N2AHD14, N2AHD16 AND
N2AHD20 CABINETS TRANSFORMER RELAY 2TT01700146
S (COOLING ONLY -460 V)
B K.O.#3 3
INLET/OUTLET DIMENSIONS K.O. DIMENSIONS **K.O.
AIR HANDLER A B C D E F G H J K K.O. #
N2AHD06A06 15-1/16 7-3/8 10-5/16
N2AHD10AO6 12-1/16 14-5/16 2 & 3
N2AHD14AO6,46 12-1/8 20-5/16 19-13/16 7/8 2 1-23/32 1-3/8 1-3/32 3/4
N2AHD16A06, 46 14-29/32 1,2 & 3
N2AHD20AO6, 46- 24-5/16
"Knockouts available on Top Panel
FIG. 1 DUCT SIZES, KNOCKOUTS AND OPERATING CONTROL OPTIONS
See Form 550.15-N3Y to install the heat pump or cooling
NOTE: All wiring must comply with local and national
electrical code requirements. Read and heed all
unit caution labels. See Fig. I for field wiring
LINE POWER CONNECTIONS
Power may be brought into the unit through the supply air
end of the unit (top when unit is vertical) or the right side
panel. Use the hole appropriate to the Unit's orientation in
each installation to bring conduit from the field supplied
disconnect. The power lead conduit should be terminated
at the transformer relay control box or electric heater box.
Refer to Table 2 for Air Handler wire requirements. See the
electric heater instructions for electric heater wiring
BLOWER MOTOR SPEED CONNECTIONS
All Air Handlers contain three speed blower motors ready
to be electrically connected to a fan relay control.
Select speed required, for proper CFM at the total duct
system static. See Table 3.
Higher efficiencies will be obtained if the indoor air volume
is as high as possible provided (1) the CFM does not exceed
the value listed in the limitations section Table 1 and (2) the
sound level is not objectionable.
Connect motor wires to motor speed tap receptacle for
speed desired. See Figure 2 and wiring label for motor
wiring details. Unused taps must remain taped.
NOTE: Motor leads are held to the blower by an adjustable
plastic tie on 208/230 volt units. Lift small tab on
wire tie to loosen. After motor speed tap is selected
fasten all wires in a neat harness.
LOW VOLTAGE CONTROL CONNECTIONS
Use 7/8 inch knockout on the left hand side panel (indicated
on Fig. 1) to bring low voltage wiring into Air Handler.
CA UTION: Use 7/8 inch plastic bushing provided to
prevent chafing of wires.
Field supplied low voltage wiring must be kept as short as
possible and away from the blower motor wires.
CA UTION: On systems with two 24 volt transformers,
use thermostat with isolating contacts to
prevent interconnection of class 2 outputs.
On 208V applications the wire connected to the 230V
transformer terminal must be moved to the 208V terminal
of the transformer.
With power supply "OFF" and thermostat set to "OFF"
attach thermostat wiring to terminal board on Transformer
Relay of Electric Heater. See wiring diagrams provided
TABLE 2 AIR HANDLER ELECTRICAL CHARACTERISTICS
MODELS TRANSFORMER MIN. CIRCUIT AMPACITY MAX. T.D. MIN. WIRE**
RELAY KIT 208 230 460 FUSE SIZE SIZE AVG.
N2AHD10A06 2T702 5 5 15 14
N2AHD14A6 2TT06700206 -11
N2AHD16A06 7 7 15 14
N2AHD16A46 2TT01700146 5 15 14
*Use Copper Conductors Only.
CONNECT TO FIELD WIRING
TERMINAL BLOCK IN ACCESSORY
24E TRANSFORMER RELAY OR
35 HEATER PACKAGE.
SSEE NOTE 2 BRN *
BLU --- MED
TION BOX GRD
460 1 60
FAN MOTOR SPEED TAP
RECEPTACLE ON TRANS-
FORMER RELAY OR
208/230 1 60
1. 208/230-FIELD CONNECT MOTOR FOR REQUIRED SPEED. REFER TO APPLICATION DATA FOR BLOWER PERFORMANCE.
FOR HIGH SPEED, WIRE 35 TO BLACK, FOR MEDIUM SPEED, WIRE 35 TO BLUE, FOR LOW SPEED, WIRE 35 TO RED.
TAPE ALL WIRES THAT ARE NOT USED.
2. 460-FIELD CONNECT MOTOR FOR REQUIRED SPEED. REFER TO APPLICATION DATA FOR BLOWER PERFORMANCE.
TAPE ALL WIRES THAT ARE NOT USED. FOR HIGH SPEED CONNECT WIRE 35 TO BLACK LEAD; FOR MEDIUM SPEED
CONNECT WIRE 35 TO BLUE LEAD. CONNECT BLACK LEAD TO BLACK/WHITE LEAD; FOR LOW SPEED CONNECT
WIRE 35 TO RED LEAD, CONNECT BLACK LEAD TO BLACK/WHITE LEAD. CONNECT BLUE LEAD TO BLUE/WHITE
3. MOTORS ARE THERMALLY PROTECTED.
FIG. 2 BLOWER MOTOR WIRING
TABLE 3 BLOWER PERFORMANCE 230V, 208V, and 460V**
(Return Air Filter and Largest Electric Heater Included)
BLOWER 0.05"S.P. 0.1"S.P. 0.2"S.P. 0.3"S.P. 0.4"S.P. 0.5"S.P.
MODEL NO. SPEED 230V 208V 230V 208V 230V 208V 230V 208V 230V 208V 230V 208V
N2AHD06A6/ MED 480 480 470 455 490 435 450 400
M1CC012A LO 490 410 480 405 460 385 435 365 410 335 370 -
N2AHD06AO6/ HI 765 690 760 685 745 670 715 645 680 615 635 575
M1CC018A or MED 605 520 600 515 585 500 565 480 535 450 500 -
G1AC018A LO 515 510 485 460 -
N2AHD10AO6/ HI 985 955 900 870
M1CC024Aor MED 945 935 900 955 855 885 800 810 745
G1AC024A LO 890 750 870 740 835 720 790 695 745 660 685 -
N2AHD10AO6/ HI 1225 1190 1165 1125 1100 1060 1030 990 955 920
M1CC030A or MED 1085 965 1035 925 980 885 915 835 845 -
G1AC030A LO 850 825 795 -
N2AHD14AO6 (46)/ HI 1490 1490 1390 1375 1270 1210 1125
M1CC036Aor MED 1370 1175 1330 1160 1260 1115 1155 1010 1035 -
G1AC036A LO 1205 1015 1170 1000 1120 965 1025 -
N2AHD14AO6 (46)/ HI 1680 1525 1625 1460 1555 1370 1460 1260 1340 1135
M1CC042Aor MED 1385 1215 1355 1205 1310 1160 1245 1140 -
G1AC042A LO 1200 1185 1160 1125 -
N2AHD16AO6 (46)/ HI 1820 1770 1755 1700 1675 1625 1585 1545 1480 1450
M1CC048Aor MED 1655 1505 1600 1475 1535 1430 1465 1370 1380 1290
G1AC048A LO 1575 1360 1535 1330 1480 1290 1415 1335 -
N2AHD20AO6 (46)/ HI 2300 2050 2235 2035 2165 1995 2085 1935 2000 1860
M1CC060A or MED 1820 1805 1785 1755 1710 -
G1AC060A LO 1650 1645 1640 1630 1600 -
**Same as 230 V.
NOTE: For A.R.I. certification testing, use the lowest blower motor speed tap, for each voltage, to obtain the certified C.F.M. at the minimum
specified A.R.I. external static pressure.
The indoor blower motors are shipped with an oil supply
which will last for several years. After this time it should be
oiled annually with about 100 drops SAE20 SD or SE rated
oil in each bearing.
Instructions for installing the unit with a filter rack are
found in the accessory instruction.
CA UTION: Equipment should never be operated without
Supersedes: 550.15-N2 (482)
Subject to change without notice. Printed in U.S.A.
Copyright 1986 by Central Environmental Systems- ALL RIGHTS RESERVED SHU 30M 686 .24
One permanent high velocity washable filter is provided
with each filter rack accessory. This filter may be cleaned
with a vacuum cleaner or washed with warm water using
a mild detergent. Do not use a high velocity water stream.
No coating is required. Install filter with cloth mesh
towards blower. Never turn a dirty filter to allow air flow
in the opposite direction.
Filters must be cleaned when they become dirty. Inspect
at least once per month. The frequency of cleaning
depends upon the hours of operation and the local
atmospheric conditions. Clean filters keep unit efficiency
Heating and Air Conditioning
035-0554.1 5. OsAffi (as
Borg-Warner Central Environmental Systems Inc. (BWCES) warrants this product to be free from defects in factory workmanship and
material under normal use and service and will repair or replace, at its option, any parts that prove to have such defects, within a period
of one (1) year from the date of product installation. This warranty covers only the equipment described by Product Model Number
and Serial Number listed on the Warranty Registration Card.
For your benefit and protection, return the Warranty Registration Card to BWCES promptly after installation. This will begin the
S warranty period, and allow us to contact you, should it become necessary.
In the absence of a recorded Warranty Registration Card, the warranty period will begin upon product shipment from BWCES.
S This warranty extends to the original consumer purchaser and subsequent purchaser, provided that the product has been installed
according to BWCES recommendations and specifications, and that the product has not been removed from its place of original install-
ation. Repair or replacement of parts shall not extend the warranty period.
This warranty applies to products installed in the United States or Canada.
1. BWCES will not pay shipping, labor, or material charges incurred to remove or replace parts under this warranty.
2. Damage occurring during transportation, installation, or servicing.
3. Damage caused by accident, abuse, fire, flood, alteration of unit, or Acts of God. (Tampering, altering, defacing, or removing unit
Serial number will serve to void this warranty.)
4. Damage caused by use of unit in a corrosive atmosphere.
5. Failure of unit to operate due to voltage conditions, blown fuses, or other damage due to inadequacy or interruption of electrical
KIM-- service or fuel supply.
S 6. Cleaning or replacement of filters.
7. Failure to have unit completely accessible for servicing.
8. Damage resulting from failure to properly and regularly clean air and/or water side of the condenser and evaporator.
__WD_ 9. Damage resulting from freezing of condenser water or condensate; inadequate or interrupted water supply; use of corrosive water;
rearrangement of unit plumbing system; fouling or restriction of the water circuit by foreign material.
10. Parts installation that prevents unit from operating with adequate supply of air or water.
11. Damage resulting from application or installation of components or accessories not approved by BWCES. (Vent Dampers, etc.)
S HIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES. EXPRESSED OR IMPLIED. RELATIVE TO THIS PRODUCT. INCLUDING
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
SOME STATES DO NOT ALLOW THE DISCLAIMER OF IMPLIED WARRANTYSO THAT THE ABOVE DISCLAIMER MAY NOT APPLY
SOME STATES ALLOW ONLY A PARTIAL LIMITATION ON IMPLIED WARRANTIES TO LIMIT THE DURATION OF IMPLIED WAR-
RANTIES TO TIE DURATION OF THE EXPRESS WARRANTY. IN SUCH STATES. THE DURATION OF IMPLIED WARRANTIES IS
HEREBY EXPRESSLY LIMITED TO THE DURATION OF THE EXPRESS WARRANTY ON TIlE FACE HEREOF.
BWCES ASSUMES NO LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES IITHAT MAY ARISE FROM THE USE OR IN-
ABILITY TO USE THIS PRODUCT, OR FROM FAILURE 10 CONFORM TO ANY EXPRESSOR OR IMPLIED WARRANTIES. BWCES
ALSO ASSUMES NO LIABILITY FOR DAMAGES UNDER THE THEORY OF STRICT LIABILITY IN TORT.
SOME STATES DO NOT ALLOW TIlE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMA-
GES. OR LIABILITY FOR STRICT LIABILITY IN TORT. SO THAT THE ABOVE EXCLUSIONS AND LIMITATIONS MAY NOT APPLY TO
BWCES DOES NOT ASSUME. OR AUTHORIZE ANY OTHER PERSON TO ASSUME FOR BWCES.ANY OTHER LIABILITY FOR THE SALE
OF TIIS PRODUCT.
W THllS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS. YOU MAY ALSO HAVE OTHER RIGHTS. WIHIC VARY FROM STATE TO
TO OBTAIN WARRANTY SERVICE:
SNotify your installing or servicing, dealer, preferably in writing, of the problem as soon as possible after its discovery. Be sure to in-
elude product model number, serial number, installation date, and the nature of the problem.
c s If response is not received within a reasonable time, notify BWCES Customer Relations Dept., P.O. Box 1592
York, PA 17405
N Service requests sent to BWCES without prior dealer contact will be referred back to a dealer through the BWCES Distribution Center.
Because this is a time consuming process, it is in the best interest of the consumer to contact a dealer directly.
For Owner's Information
PRODUCT MODEL NO. INSTALLATION DATE _____
UNIT SERIAL NO. INSTALLING DEALER___
Coyrmight 0 196 by Central Envionmenta Systems-ALL RIGHTS RESERVED SHU 100M 586 .04 50.05-WC2
Catrsl Poet Office York
Environmental Box 1592 Pennsylvanla