NORDYNE Air Handler (indoor Blower&evap) Manual L0801591

User Manual: NORDYNE NORDYNE Air Handler (indoor blower&evap) Manual NORDYNE Air Handler (indoor blower&evap) Owner's Manual, NORDYNE Air Handler (indoor blower&evap) installation guides

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indoor Air Handlers

These instructions are primarily intended to assist qualified individuals experienced in the proper
installation of heating and/or air conditioning appliances. Some local codes require licensed installation/service personnel for this type equipment. All installations must be in accordance with these
instructions and with all applicable national and local codes and standards.
Before beginning the installation, read these instructions thoroughly and follow all warnings and
cautions in the instructions and on the unit. When performing brazing operations have a fire extinguisher readily available and use a quenching cloth and brazing shield.
Improper installation, service, adjustment, or maintenance can cause fire, electrical shock or other
conditions which may result in personal injury or property damage. Unless otherwise noted in
these instructions, only factory authorized kits or accessories may be used when modifying this
product.

Table of Contents
1. Air Handier Specifications ...................................................................................................
Unit Dimensions ....................................................................................................................

4=5
4

2, Installation
Requirements .......................................................................................................
Minimum Ampacity and Maximum Overcurrent Protection ...................................................

5
5

3. Air Ducts, Filters,

Horizontal

4. Verify Pressurization
5. Refrigerant

Applications

............................................................................

...............................................................................................................

Line Connections

................................................................................................

6. Electrical Wiring .....................................................................................................................

7. Start=up and Adjustment .......................................................................................................

8. Optional

Humidistat

(Variable Speed Only) .........................................................................

9. Care and Maintenance ...........................................................................................................

1. AiR HANDLER

SPECiFiCATiONS

applications when applied with the appropriate
field kit (See Technical Specifications).

Indoor Air Handlers are designed and approved
for attic, basement, alcove, closet and crawl
space installations.

Dimensional
Figure 1.

Factory ready horizontal Air Handlers may be
applied in upflow or horizontal-left and -right
discharge applications. These units may also
be applied in downflow discharge when applied
with the appropriate field kit (See Technical
Specifications).

drawing for the unit is shown in

Field-installed electric heater kits are available.
Available heater kits for these units are listed
in the Technical Specifications. Instructions for
installing the electric heaters are included with
the heaters.
All units equipped with standard blowers may be
upgraded to variable speed with the addition of
a variable speed conversion kit. See Technical
Specifications for details.

Vertical only Air Handlers are factory ready for
upflow applications.These
units may be applied
in downflow or horizontal left and right discharge

J-3/4" 7
13'

_11/8"

K.O.

(typ.)

11/4"15/8

17/8'q

2 5/8"-]

_11/8"K.0.
-"

(typ.)

5 5/8"
_

13/4"

K.O.

(typ.)
DETAIL"D"_

3114'_
21/4'L
LIQUID

•

SUCTION

151_

Cabinet
Size

Detail
D

43=5/16

14=3/16

12=3/4

43=5/16

19=11/16

18-1/4

Tall B

49=5!16

19=11/16

18-1/4

55=15!16

22=7/16

Yes

Figure 1. Unit Dimensions
4

Air handlers set up with 15 kw or more of electric
heat will normally be configured for multiplecircuit power supply. They may, however, be
connected to a single-circuit power supply with
the addition of a single ci rcuit accessory kit (See
Technical Specifications). Select the wire size
and over-current protection in accordance with
the minimum circuit ampacity and maximum
over-current protection shown in Table 1.

2. INSTALLATION

stallation of Air Conditioning and Ventilation
Systems" (NFPA 90A), "Standard for Installation of Residence Type Warm Air Heating and
Air Conditioning Systems" (NFPA 90B), these
instructions, and all applicable local codes.
National Fire Protection Association,
Batterymarch Park
Quincy, Maine 02269
www.nfpa.org
(617) 770-3000

REQUIREMENTS

Check Equipment
-- All installations shall
be made as described in these installation
instructions and in accordance with all applicable national and local codes including the
requirements of local utilities.

Location
-- To insure proper condensate
drainage, the unit must be installed in a level
position within 1/4 inch over the height, width,
and depth of the unit. The best system performance will be obtained if the unit is located in
a centralized position with respect to the air
distribution system.

Requirements
and Codes-Electrical power
wiring must be made in accordance with all applicable local codes and ordinances, and with
the cu rrent revision of the National Electric Code

When an air handler is installed in or above a
living space, the installation of an auxiliary drain
pan under the entire unit is required to reduce
the possibility of property damage.

(ANSI/NFPA 70). Air ducts must be installed in
accordance with the standards of the National
Fire Protection Association "Standard for In-

These wiring requirements
with 115 volt units.

Inc.

are for units with optional

heater kits. They can not be used

Au=..eatInstalled
IN_N_lnn<_l
nn_ InlnHInl<_ln>n_ln><_ln*n_l

_"°m_w_I.... !..........I
! .........................
! I ! ! !

'°5 *WireAWG75°C
!14 ! 8 !8<_*>!
8 !4<3q2 ! 0 !00 !

Maximum I
I240 VAC,
I 50 I& 60HzI Single
I Phase
I
I
I
Over-currentI 18 I 40 I 80 I 60 I 901128118611781

Rating

u
I

*wireAwG60oc
! 14! 8 ! 6 14141414141
*w,reAwG_oc
!14 ! 8 !8<6-_!
8 ! 6! 6! 6! 6 !
Maximum
Circuit
Arnp._I

***Min,

Over-current I 18 1461 80 1661691691661861
Rating
Circuit

Amp.

*WireAWG75°C

! - !-!

Ma=_mu.,,I! - I!-!- I
=- *wire_w_°°°c
Over-_urrent I - I - I
Rat ng

Amp.

25.6

- !-!

59.6

56.6

56.9

....

19! 8 ! 8 ! 8 !

I!- I!19!6!6!6!_
I
I
I
I

- I - 1391691661691
!

25.0

50.0

......

_ *w_reAW_°c!- ! - ! - ! - ! - ! - ! 16!8 !
Ma=_.,u.,, I _ I!-! I - I!-!-!-!1618!_
I I
I
I
I
"*,,io.
Circ.,.Wire_W_00oc!
Over-_urrentI - I - I - I - I - I - 1361691
Ratng

*All wire sizes for copper conductors only, based on NEC Table 310-16.
**Required for C-cabinet variable speed.
**Circuit
arnpacity slightly higher for variable speed. See label on blower.

Table 1. Minimum Ampacity

and Maximum Overcurrent

Protection
5

Allservicingandcleaningoftheairhandlercan
be donefrom the front.Adequatehorizontal
clearancesshould be providedto allow for
serviceandcareoftheunit.Aminimum24inch
clearance
atthefrontoftheunitisrecommended.
Theseunitsaresuitableforattic,closet,crawl
spaceor alcoveinstallationat zeroclearance
fromcombustibles.

Association

"Standard

for Installation

of Air

Conditioning and Ventilation Systems" (NFPA
90A), "Standard for Installation of Residence
Type Warm Air Heating and Air Conditioning
Systems" (NFPA 90B), these instructions, and
all applicable local codes.

-- The condensate pan
has primary and secondary drain connections.
The connections have 3/4 inch female pipe
threads.

Use transition fittings if the supply and/or return
air openings of the unit do not match the duct
openings. These transitions should be dimensioned in accordance with standard practice as
specified in the ASHRAE recommendations for
duct transitions.

All condensate

Flexible connectors should be used between the

CondensateDrain

drains should be a minimum

of 3/4 inch PVC pipe or equivalent. The drain
should maintain a minimum horizontal slope in
the direction of discharge of not less than 1 inch
vertical for every 10 feet of horizontal.
If the air handler is located in or above a living
space where damage may result from condensate overflow, an auxiliary drain pan shall be
installed under the unit. A separate drain line
should extend from the pan to a conspicuous
point and serve as an alarm indicating that the
primary drain is restricted. As an alternative to
a separate drain line, an approved water level
indicator or float switch device should be used to
shut down the unit in the event water is detected

unit and the ductwork to prevent transmission of
vibration from the unit to the structure. If electric
heater kits are installed, heat resistant material
must be used for the flexible connector at the
supply air end of the unit.
Air Filter Installation -- The filter may be located in the return air duct system or installed
into the air handler filter track located in the
bottom of the unit.
To install the filter, remove the filter door. The
filter sizes for the air handler cabinets are:
Cabinet

12x20x1

in the auxiliary pan.
Install a 5 inch trap in the condensate drain
line as close to the coil as possible. Make sure
that the top of the trap is below the bottom of
the drain pan to prevent the condensate from
overflowing the drain pan. Prime the trap with
water. Insulate the drain if it is located in an
unconditioned space, and test the condensate
line for leaks. Consult local codes for additional
restrictions or precautions.
NOTE: There must be only one trap in the drain
line. Using more than one trap may prevent
drainage.

IMPORTANT:
The plastic drain pan must be level
or slightly
sloped toward the drain
lines.

Filter

18x20x1
C

20x20x1

z WARNING:
Never operate the unit without
ter or with the doors removed.

a filDust

and lint in the return air can build up
on internal
components,
resulting
in a loss of efficiency,
equipment
damage, and possible fire risk.
Upflow Applications
-- All air handlers are
factory shipped, ready for upflow configuration,
all return air must enter from the bottom of the
unit. A typical installation of the unit in a ducted
return air mode is shown in Figure 2.

3. AIR DUCTS, FILTERS,
HORIZONTAL APPLICATIONS

Downflow
Applications
-- The downflow
accessory kit (See Technical Specifications) is
required for downflow applications. Instructions
for installing the downflow accessory kit are
included with the kit. It is recommended that

Air ducts should be installed in accordance with
the standards of the National Fire Protection

the accessory be installed prior to installing
the unit. All return air in downflow applications

mustenterthroughthetopofthe unit.Atypical
installation
oftheunitina downflowapplication
is shownin Figure3.
Horizontal Left And Horizontal Right -- Air
handlers may or may not be shipped from the
factory with all the parts required for horizontal
left applications and horizontal right applications
(see Figure 4). If your unit does not have parts
for a horizontal application, a kit is available
(see Technical Specifications).
To Configure
Installations:

Unit for Horizontal

LEFT

1) Remove the coil access door.
2) iMPORTANT: Remove the plug from one
of the threaded holes in the horizontal drain
pan. Completely remove the webbing located in the threaded holes of the horizontal
drain pan. If webbing is not removed, the
drain will not function properly and ceiling
damage may occur.
3) Insert a plug (from the horizontal drain pan)
into the open and unused drain hole in the
drain pan at the bottom of the unit to block
bypass air.
4) Remove the corresponding
drain line
knockout from the coil access door to allow
access to the horizontal drain.
5) Replace the door and attach the drain
line.

To Configure
Installations:

Unit for Horizontal

RIGHT

1) Remove the coil access door. Unscrew the
line-set tube close-off plate from the front
left cabinet rail.
2) Slide the coil and drain pan assembly out
of the unit.
3) Remove the sheet metal hairpin covers
(if supplied) from the back of the coil and
discard.
4) Place the horizontal drain pan on the
opposite side of the coil. On units with 2
sets of knockouts, remove the other set of
knockouts in the coil spacing plates and
insert support rod.
5) Slide the coil and the horizontal drain pan
assembly back into the unit. Reattach the
tube close off plate.
6) iMPORTANT: Remove the plug from one
of the threaded holes in the horizontal
drain pan. Completely remove the webbing located in the threaded holes of the
drain pan. If webbing is not removed, the
drain will not function properly and ceiling
damage may occur. Insert the plug (from
the horizontal drain pan) into the open and
unused drain hole in the drain pan at the
bottom of the unit to block bypass air.
7) Remove the corresponding
drain line
knockout from the coil access door to allow
access to the horizontal drain.
8) Replace
line.

the door and attach the drain

L______

Figure 2. Upflow Installation

Figure 3. Downflow

Installation
7

The unitmayalsobe installedin a horizontal
applicationwith the unitsuspendedfromthe
ceiling.A typicalinstallationof the unit in a
suspendedhorizontalapplicationis shownin
Figure4.

MetalandAir Conditioning
Contractors
National
Association(SMACNA)applicationstandard
forductliners.
DuctliningmaterialmustbeULclassifiedbatts
or blanketswitha fire hazardclassification
of
FHC-25/50or less. Fiber ductworkmay be
usedin placeof internalductlinersifthe fiber
ductworkis inaccordance
withthecurrentrevisionofthe SMACNAconstructionstandardon
fibrousglassducts.

NOTE:In all horizontalapplicationsin which
the unit is installedabovea finishedceiling
and/or livingspace,a secondarydrain pan
must be installed under the entire unit to
avoid damageto the ceilingin the eventof
condensateoverflow.

Fibrousductworkandinternalacousticallining
mustbeNFPAClassI airductswhentestedper
ULStandard181forClass1 ducts.

SupplyAir Ducts-- Benduptheflangesonthe
top of theunitandconnectthesupplyair duct
overthem.Securetheducttotheflange,using
appropriatefastenersforthetypeofductused.
Sealthejointbetweentheductandtheunitto
avoidairleakageandsweating.
Thesupplyair
ductworkmustbe of noncombustible
material
forthefirst24 inchesfromthe unit.

Through-the-FloorInstallations--Whenever
the supplyor returnair ducts pass through
the floor,a 1/4"thicknoncombustible
resilient
gasketmustbe usedbetweenthe duct,unit
andfloor.

Someinstallationswith a short,straightrun
from the unit to the first branchtakeoffmay
requireacousticallininginsidethe supplyair
ductwork.Acousticalinsulationmustbe in accordancewiththecurrentrevisionoftheSheet

Ductwork in Unconditioned
Spaces -- All
ductwork located in unconditioned space must
be adequately insulated to prevent excess duct
loss and condensation. All externally insulated
ductwork must have an adequate vapor seal.

_-THREADED

ROD

SUPPORT
LOCATION

MEMBER

THE BLOWER DECK

Figure 4. Typical Horizontal Installation
Using Threaded Rod and
Supporting
Members (Shown in Horizontal Left Position)
8

ConsultyourDistributorfortherecommended
type andthicknessof insulationforyourarea
as requiredby localcodes.
4. VERIFY

The orifice employed in the air handlers has
been sized for use with the most popularly
matched outdoor unit.The orifice size in the coil
as shipped from the factory is listed on the air
handler rating plate. Check that the orifice size
provided with the air handler is correct for the
outdoor unit being applied. If the orifice size is
incorrect it should be replaced as follows:

PRESSURIZATION

WARNING".
NITROGEN

z WARNING:

HEALTH

[]

FLAMMABILITY

[]

REACTIVITY

[]

NITROGEN
O Minimal

Hazard

1 Slight

This coil is pressurized
with Nitrogen. Pressure must be relieved
in
order to prevent the potential of an
injury or fatality from the cap during
the removal
process, Avoid direct
face exposure or contact with valve
when gas is escaping. Always ensure
adequate ventilation is present during
the depressurization
process. Any
uncertainties
should be addressed
before

proceeding.

VERIFY PRESSURiZATiON:
Test by depressing Schrader valve and listen
for escaping gas
If no pressure is found, test coil for leak
- If no leak is found, install coil
- If leak is found, clearly mark leak
location and return coil to your distributor for processing

5. REFRIGERANT
CONNECTIONS

[]

FLAMMABILITY

[]

REACTIVITY

[]

0 Minimal

Hazard

1 Slight

Hazard

This coil is pressurized
with Nitrogen. Pressure must be relieved in
order to prevent the potential
of an
injury or fatality from the cap during
the removal process.
Avoid direct
face exposure or contact with valve
when gas is escaping. Always ensure
adequate ventilation is present during the depressurization
process.
Any uncertainties
should
be addressed before proceeding.
1.

LINE

Note: Do not remove seals from the coil until
tubing connections

HEALTH
Hazard

Remove cap from SchradervaIve on liquid
line. Relieve all pressure from the coil by
depressing the valve on the end of the liquid line. Remove the valve core. Properly
dispose of all removed parts.
Loosen the distributor body halves by applying two wrenches and squeezing them
together as shown in Figure 5, to turn the
assembly nut counterclockwise.

are ready to be made.

Note: The air handler coil does not contain
a refrigerant charge.
instructions
included

Reference installation
with outdoor unit for

information regarding the refrigerant
included in the outdoor unit.

charge

Note: The following instructions are for air
handler models employing an orifice for the
refrigerant metering device.
Figure 5. Wrenches on
Distributor Body and Assembly

Nut
9

Note: On models which use aTXV, it is recommended to wrap a wet rag around the suction
line between the sensing bulb and the line set
braze joint before applying any heat.
10. Unbraze and remove the cap on the suction
line. Unbraze and remove the valve core
holder on the liquid line.

Figure6. Removalof

Orifice

11. Cut the line set tubing to the proper length.
Be sure that the tubing has been sized in
accordance with the outdoor unit specifications.
12. Inspect both refrigerant lines. The ends of
the lines must be round, clean, and free
of any burrs.
13. Place grommets in proper orientation onto
lineset with sufficient distance to braze joint
as to not damage the grommets.
14. Insert the line set tubes into the coil tube

Figure 7. Orifice
insertion in Distributor

3.
4.

5.
6.
7.

stubs until they bottom out.
Body

Continue to unscrew the assembly nut to
separate it from the distributor body.
Insert a light-gauge wire hook between
the distributor body and the orifice to lift
the orifice out of the body (See Figure 6).
Carefully remove the orifice being careful
not to scratch either part.
Check the actual size of the new orifice (the
size is stamped on the side of the orifice).
Insert the new orifice in the distributor body
as shown in Figure 7.
After installing the orifice in the distributor
body, re-attach the assembly nut to the distributor body and tighten it to 10-12 ft/Ibs of
torque. If no torque wrench isavailable, mark
a line along both the nut and body after hand
tightening and then tighten an additional 1/4
turn.The misalignment of the two lines will
show how much the nut is tightened.

Line Connections:
8.

If not already done so, release pressure from
the coil by removing the valve cap and then
depressing the valve on the end of the liquid
line. Remove the valve core and dispose of
properly.
Making note of orientation, remove the hole
grommets and tube close-off insulation from
around the coil and refrigerant line set.
10

Note: On models which use aTXV, it is recommended to wrap a wet rag around the suction
line between the sensing bulb and the line set
braze joint before applying any heat.
15. Braze the individual connections with dry
nitrogen flowing through the joints to eliminate internal oxidation and scaling.
16. Replace grommets and insulation. Check
the assembly for leaks.
17. Properly dispose of all removed parts.
Note: On horizontal or downflow applications of
models with the TXVs, to ensure proper performance, the sensing bulb must be re-positioned
so it is in the 4 o'clock or 8 o'clock position on
the suction tube after final orientation of the
air handler.

z WARNING:
To avoid the risk of electric shock,
personal injury or death, disconnect
all electrical power to the unit before
performing
vice. The

any
unit

one electrical

maintenance
may

power

have

or sermore

supply.

than

6. ELECTRICAL

WiRiNG

General -- Electrical power wi ring must be made
in accordance with all applicable local codes
and ordinances, and with the current revision of
the National Electric Code (ANSI/NFPA 70). If
any of the original wire as supplied with the unit
must be replaced, it must be replaced with wire
material having the same gauge and temperature rating. Disconnection means: a means to
disconnect the appliance must be incorporated
in the fixed wiring.
LineVoltage-Before proceeding with the electrical connections, make certain that the voltage,
frequency, and phase of the supply source are
the same as those specified on the rating plate.
Also, verify that the service provided by the utility
is sufficient to handle the additional load imposed
by this equipment.
See the unit wiring label for proper high and low
voltage wiring. Make all electrical connections in
accordance with the National Electric Code and
any applicable

local codes or ordinances.

Use a separate branch electrical circuit for this
unit. A disconnecting means must be located
within sight of, and readily accessible to, the
unit. When electric heat packages with circuit
breakers are field-installed, the circuit breaker
may be used as a disconnecting means in most
applications. Reference the NEC and Local Codes
for Disconnect requirements.
208/240 volt units are shipped from the factory
wired for 240 volt transformer operation. For 208
volt operation, remove the lead from the transformer terminal marked 240v and connect it to
the terminal marked 208v. For maximum ampacity
and overcurrent protection, see Table 1.
Provide power supply (or supplies) for the unit in
accordance with Table 1, the unit wiring diagram
and the unit rating plate.
When a heater kit is installed: Connnect the
2 wire plug of the air handler with the mating
2 wire plug of the heater kit. Connect the line
voltage leads to the circuit breaker or terminal
block provided. Connect the heater kit plug with
the mating receptacle on the air handler control
board. When installing a 25 kw or 30 kw heater
kit, follow the instructions provided with the kit
for proper installation.

When a heater kit is not installed: Remove the 2
wire plug of the air handler by cutting the wires
and discarding the plug. Strip the ends of the 2
air handler wires and connect to the line-voltage
leads with the 2 wire nuts provided.
Use copper wire only for the line voltage power
supply to this unit. Aluminum supply wire may
be used if a heater kit is installed. Use UL listed
conduit and a conduit connector for connecting
the supply wires to the unit and for obtaining
proper grounding. Grounding may also be accomplished by using the grounding lug provided
in the control box. Field supplied bushings for the
power supply cables must be added to support
and protect the power supply cables.

HEATING

ELEMENT

LOGIC

The control board in the air handler controls the
timing sequence of the elements. Depending on
the thermostat connection, there are 2 timing
sequence variations that can be chosen. See
table 2 for element sequence timing. The board
also is equipped with a 3 second blower on delay
and a 15 second blower off delay.

z WARNING:
The unit cabinet must have an uninterrupted and unbroken electrical ground
to minimize the risk of personal injury
if an electrical fault should occur.This
ground may consist of electrical wire
or approved
conduit when installed
in accordance
with existing national
or local codes.
Low Voltage -- Install the grommet, which is
packed with the unit, in the hole for low-voltage
wires.When the low voltage wires are positioned
in this grommet, the grommet will prevent chafing
and/or shorting of the low voltage leads. Connect
the low-voltage wiring to the thermostat and the
outdoor unit and the appropriate screw terminal
located on the control board.
NOTE: Where local codes require that the
thermostat
wiring must be routed through
a conduit or raceway, splices can be made
inside the unit; however, all wiring
must
be NEC Class 1 and must be separated from
incoming power leads.

NOTE: Jumper
Wl and W2
together
shorter

for

staging
See

time.
a 2

NOTE: Jumper
W1 and W2
together
for

Thermostat
GRW
000

Y
)

shorter
staging time.
See table 2

Y/Y2

@--

r
/
Thermostat
/ G R W2C E O Y /
/ OOO000_)[
NOTE: Jumper
betweenW2 and E is
requiredwhen no OD
T-Stat is used.

"--_-

c @
Air Handier
Typical

A/C OD Section
Air Conditioner
w/Standard
Air Handier

Wl
and Jumper
W2
NOTE:
together for
shorter
staging
le.
See table 2

Thermostat
G

Air Handier

Heat Pump OD
Section

Typical Heat Pump w/Standard

NOTE: Jumper
Wl and W2
together for
shorter

Air Handler

Thermostat
G RW2C

E O Y

staging time.
See table 2

@.
COY

G G
R G
° @
NOTE: in AC appLications,the Oand Y connection
must be connected as shown.

Air Handier

NC OD Section

Typical Air Conditioner
with
Variable Speed Air Handler

Air Handler

Heat Pump OD
Section
Typical Heat Pump with Optional Outdoor
Thermostat and Variable Speed Air Handler

* On single stage systems connect to Y/Y2 to obtain selected cooling speed

Figure 8. Typical Air Conditioning

and Heat Pump System Connections

NOTE: Jumper
Wl and W2

together

/ IG R W

for

shorter

NOTE: Jumper

[

Wl and W2
together
for
shorter
staging time.
See table 2

/
/ G
[
'

/
?t

/ I Thermostat
Y2

SS't 7't ,te'

Thermostat
RW2C

O Y1 Y2 WlW3
,

(I/_

_Y2

t I

COY1

Y1
Y/Y2

(_--

(_-_

o @
_

NOTE:

in AC applications,

connection

Air Handler

the 0 and Y

mustbeconnectedasshown,

A/C OD Section

Typical 2-Stage Air Conditioner
with Variable Speed Air Handler

Air Handler

Heat

Pump

OD Section

Typical 2-Stage Cooling Heat Pump with
Optional Outdoor Thermostat and Variable
Speed Air Handler

Figure 9. Typical 2-Stage Air Conditioning
and
2-Stage Heat Pump System Connections

iMPORTANT!
On variable
speed models
when the unit is used in an air conditioning
system, connect the "O" terminal to the "Y"
terminal. See Figure 8 & 9.

CAUTION:
isolation

must

be maintained

from

the external Class 2 output of any
transformer
in a cooling circuit. Use
a thermostat
with isolating contacts
to prevent inter-connection
of Class
2 outputs.
Check all factory wiring per the unit wiring
diagram and inspect the factory wiring connections to be sure none were loosened in transit
or installation.

CAUTION:
Make sure all doors are installed before restoring power to the unit.

7. START=UP AND ADJUSTMENT
General -- Prior to start-up, verify that:
1. The line voltage power leads are securely
connected and that the unit is properly
grounded.
2. The low voltage wires are securely connected to the correct leads from the unit.
3.

The upper and lower doors are in place
and securely connected to the unit.

NOTE: The control board is programmed with
a 40 second off delay in the cooling mode for
optimum system performance

and efficiency.

Selecting
Proper Blower Speed for MultiSpeed Units -- The blower speed is preset
at the factory for operation at the same speed
for heating and cooling, by using the blower
motor jumpering terminal on the blower motor
and connecting it to the desired speed with
both the red and black wires connected to the
jumpering
terminal.
For optimum system
performance and comfort, it may be necessary

Control

Signal

Board Action

Operation

W1 only
Off

W1 &W2

Off

W1 & Y/Y2

Off

IStage 1 Heat on instantly
Heat blower on after 3 second delay
i Stage 3 & 5 Heat on after 1 minute delay
Stage 2 Heat on after 2 minute delay
i Stage 4 & 6 Heat on after 3 minute delay
Heat stages off instantly
Blower off after 15 second delay
IStage 1 Heat on instantly
Heat blower on after 3 second delay
Stage 3 & 5 Heat on after 10 second delay
Stage 2 Heat on after 20 second delay
l Stage 4 & 6 Heat on after 30 second delay
IHeat stages off instantly
Blower off after 15 second delay
IStage 1 Heat on instantly
Cool blower on after 3 second delay
i Stage 3 & 5 Heat on after 1 minute delay
Stage 2 Heat on after 2 minute delay
IStage 4 & 6 Heat on after 3 minute delay
IHeat stages & Cool blower off instantly
Heat blower energizes and then turns off after 15 second delay
I

i Stage 1 Heat on instantly
Cool blower on after 3 second delay
i Stage 3 & 5 Heat on after 10 second delay
JStage 2 Heat on after 20 second delay
IStage 4 & 6 Heat on after 30 second delay

Off

IHeat stages and Cool blower off instantly
Heat blower energizes and then turns off after 15 second delay

W 1, W2 & Y/Y2

Table 2. Heating

to change the factory set speed.To change the
blower speed, disconnect all electrical power to
the unit and remove the upper door. Remove
the black and red wires from the blower motor
jumpering
jumpering

terminal. Discard the blower motor
terminal.

Connect the heating speed wire (red) and the
cooling speed wire (black) to the desired blower
speed marked on the terminal block of the blower
motor. On standard 3 speed motors terminal 4 =
Hi speed, terminal 5 = Med speed and terminal
6 = Low speed. Standard C cabinet units are
equipped with 5 selectable blower speeds.
Terminal 1=Low speed, terminal 2=Medium
Low speed, terminal 3=Medium speed, terminal
4=Medium Hi speed and terminal 5=Hi speed.
See table 3 for airflow data.
Replace the upper door and secure it to the
unit. Restore power to the unit.
Selecting continuous
low speed fan opera=
tion (Standard Blower) -- The air handler is
14

Element

Logic

equippedwith the option of continuouslowspeed
fan operation.When G isenergized withoutY/Y2,
the air handier wiii operate using the heating
speed. With G &Y/Y2 orY/Y2 is energized, the
air handier will operate in the selected cooling
speed (including 40 sec blower-off delay).
NOTE: To achieve continuous low speed fan
operation Y must be connected at the air
handler.
Selecting Proper Airflow for Variable Speed
Units -- Variable speed air handlers are
equipped with a microprocessor-controlled
variable speed motor that is pre-programmed to
deliver optimum airflow in a variety of conditions
and system configurations. Before operation, the
air handler must be configured to match the unit
with the system, system options, and climatic
conditions. Once configured, the air handler
responds directly to the thermostat inputs, as
well as the optional humidistat (Section 7).
D uring no rmal ope ration, the motor will grad ually
change speeds during start-up, shut down,

System Airflow Data
Dry

Coil

EBP
Low

CorrectedESP
"24/'25K,
A-Cabinet

Medium
Co rrectedESP_
High
Co rrectedESP_
Dry Coil

EBP
Low

A-Cabinet

Corrected

0,65

0,76

861

823

781

734

682

625

564

498

O,OO

O, OO

0,11

0,23

0,36

0,48

0,60

0.72

1072

1026

975

920

860

797

730

859

O,OO

O, OO

O.OO

0,14

0,27

0.40

0.53

0,67

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

647

581

508

0,50

0,62

0,74

1118

1087

1046

997

940

874

799

717

O.OO

O, OO

0,04

0,17

0.29

0,42

0,55

0,68

1277

1233

1184

1130

1070

1005

935

860

O,OO

O, OO

0,00

0,10

0,23

0,36

0,49

0,63

EBP

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

Low

708

890

664

628

584

532

471

401

O, 08

O, 19

O,30

O,41

O,53

O, 64

O, 76

904

886

854

810

753

883

600

O, 10

0.22

0,38

0,46

0,58

O, 71

1126

1101

1056

992

908

805

O.09

0,22

O,85

O, 49

O,64

909

1118

1132

ESP

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

Low

953

915

871

821

764

701

631

555

0,00

0,04

0,16

0,27

0,39

0,51

0,62

0,74

1265

1232

1188

1133

1067

991

903

805

O,OO

O, OO

0,03

0,15

0,28

0,41

0,54

0,68

High

1427

1385

1333

1270

1196

1113

1018

913

ESP _

0,00

O, O0

O,OO

0,09

0,23

0,36

0.50

0,64

EBP

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

Low

1324

1302

1271

1233

1187

1134

1072

1003

Dry Coil

CorrectedESP

Medium
CorrectedESP

_
High

Corrected

ESP _

Dry Coil

Corrected

0,06

0,17

0.27

0,38

0,49

0,61

0,72

1455

1418

1373

1320

1260

1193

1118

O.OO

O, OO

0,13

0,24

0,36

0,47

0,58

0,70

1637

1601

1558

1506

1447

1380

1305

1223
0,68

O,OO

O, OO

O,OO

0,21

0,33

0,44

0.56

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

Low

1605

1606

1592

1565

1524

1468

1399

1318

0,11

0,21

0,31

0,42

0,52

0,63

0,74

1977

1939

1890

1830

1758

1675

1580

1474

ESP _

Corrected

0,00
1485

EBP

Medium
ESP_

High

2264

ESP_

Dry Coil

0
2182
0

0,18

0,28

0,39

0,50

0,61

0,72

2095

2003

1906

1805

1698

1586

0,26

0,37

0,49

0,60

0,71

ESP

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

Low

1348

1272

1198

1126

1056

988

922

858

O,OO

0,11

0,22

0,83

0,44

0,55

0,65

0.76

1517

1455

1390

1325

1258

1189

1120

1048

ESP _

Med-Low
CorrectedESP

Medium
ESP _

Med-High

Corrected

0,53

0,38

CorrectedESP

Corrected

0.42

704

Medium

Corrected

0,30

ESP _

eorrected

*60K,
C-Cabinet

0,19

753

CorrectedESP

Corrected

O, O7

ESP _

Dry Coil

"48/'49K,
C-Cabinet

345

O,O0

ESP _

Corrected

B-Cabinet

0.80

408

0,27

Medium

"42K,

0.70

463

0,15

High

B-Cabinet

0.60

515

793

CorrectedESP

"30/'38/'37K,

0.50

583

825

High

"24/'25K,
B-Cabinet

0.40

807

0,04

CorrectedESP

Corrected

0.30

647

849
_

Medium

Dry Coil

0.20

683

0,00

CorrectedESP
*3OK,

0.10

ESP _

O,OO

O, OO

0,19

0,30

0,41

0,52

0.63

0,74

1799

1752

1702

1650

1596

1539

1481

1420

O.OO

O, OO

O,OO

0,25

0,36

0,47

0,58

0,69

1956

1910

1862

1811

1756

1699

1639

1575

O,OO

O, OO

O,OO

0,22

0,33

0,44

0,55

0,66

High

2146

2099

2050

2000

1948

1894

1839

1783

ESP_

O,O0

O, O0

O,O0

0,29

O,40

O. 51

O,62

ESP estimate with wet coil and filter

Notes:
1)
2)
3)

Airflow is shown in cfm, +/- 5%.
External static pressure (ESP) is shown in inches w.c.
See unit nameplate or installation instructions for maximum
pressure.
Table 3. System Airflow

recommended

external static

Data
15

A-CABINET
Switch
Number

I
I

B-CABINET
Switch
Nominal

Nominal
Capacity

Number

CFM

411.512.012,513.0

540

1 _

mmmdmlmld

600 o o o o _
660 o o i o_
715 iooi_
790 1 o o ol
870 1 o i ol
915 o i o 11
988 1 1 0 11
1015 0 1 0 o l
1060 0 1 1 o l
1075 1 1 0 o l
1165 1110111

I
I
I
I
I
I _
I _
I _

C-CABINET
Switch
Number

Capacity

0FM72001 _2"53'013"54'(0
2 0
3 1
4

800 o o o o m
85o i
88o 0
948 i
i040 i
i068 0
1146 i
1206 0
1268i

0
0
0
0
i
i
i
i

0
i
0
i
0
0
0
o

i
0
0
0
i
i
0
o

_
_
I
I
I
I
I
l

I I I
I I
I I
I
I
I

_
_
_
I
I
l

1326
o,,o II I
[]

13_0
i,,o III

Nominal
Capacity

OFM

413.013.54,015.0

1075

1135

1225

0 _

1295

1380

1460

iml

11
011
1740 010
01
1860
11
0 ol
196o o I i o l
2090 1 1 1 ol
1525

1625

/
I
I

I
I
l
I
l

_
_
l []
I []
l []

Note: 1=ON, 0=OFF

Table 4. Air Flow Selection
when thermostat inputs change, and when the
duct static pressure changes (vents closed or
opened, filter clogging, etc.). The air handler
is configured by setting the selector switches
and removing jumper connectors as directed
A-CABINET

for Variable

Speed Models

below. IMPORTANT!

This air handier

has

been designed to givethe installer maximum
flexibility
to optimize system performance,
efficiency, and comfort. Because there are
so many different ways to set up the air
handler it is important to read and follow
these directions
carefully.

Switch Number
NominaIKW

CFM

0-5

700

0 0

8oo
950

1o
01

1100

1 1

6-9
to-t4
15

1 2 3 4 5 6 7 8

B-CABINET
Switch Number
NominaIKVV

CFM

0-5

700

0 0

6-t0
tt-t5

8oo
950

10
oi

16-20

1100

1 1

Determining
Nominal System Capacity--In
order to select the appropriate airflows for the
air handler the nominal system capacity must
be known. The nominal system capacity is
always the nominal capacity of the outdoor unit.
In some cases the nominal system capacity is
not the same as the nominal capacity of the air
handler. Always refer to the nominal capacity
of the outdoor unit to determine the nominal
system capacity.

1 2 3 4 5 6 7 8
Selecting
the Basic Cooling/Heat
Pump
Airflow---The basic cooling/heat-pump airflow
is selected by setting switches 1 through 4
on the thermostat input board located on the

C-CABINET

Switch

CFM

Switch Number

Nominal KW

C-CABINET

1 2 3 4 5 6 7 8

0-9

700

0 0.

15-20

950
ttoo

1o
o

21-30

1500

1 1

10-14

Delay Description

No Delay

De-Hum,

De,
o,A
De,
o,B

Number

00
0,

Note: O=Off, 1=On

Table 5. Minimum
16

Electric

Heat Airflow

Table 6. Delay Settings

(all models)

blower.Allairflowsforothermodesofoperation
(exceptelectricheat)are determinedby this
basicsetting.

Reference Table 5 for recommended

minimum

electric heat airflow settings. The minimum
electric heat airflow setting may be set higher,
but must never be set lower than the setting
Table4 showsthebasicairflowvaluesversusthe shown in Table 5.

airflowselector
switchsettings.Table
4alsoshows
therangeofbasicairflowsettingsrecommended
foreachnominalsystemcapacity.
Note:The15+SEERvanablespeedairhandlers
thatarematchedwitha 2-stagecoolingoutdoor
unit,areprogrammed
to operateat 75%of the
selectedairflowwhilethesystemisintheIo-cool
modeand100%oftheselectedairflowwhilein
hi-coolmode.
NOTE:TheCFMvalueslistedin thetablesare
notdependent
onductstaticpressure.The
motor
automatically
compensates
forchangesinduct
staticpressure(withinthelimitsof themotor).
Formaximumcapacityand energyefficiency,
select an airflow at or near the top of the
rangefor thatnominalcapacity.Formaximum
dehumidification,select an airflow near the
middleor bottomof the rangefor thatnominal
capacity.Additionalinformationon humidity
controlcan be foundin the sectionslabeled
"Humidistat"
and"DelaySetting".
NOTE: If coil icing is observed,the basic
cooling/heat-pump
airflowselectedmaybetoo
low.Double-check
tobesurethesettingselected
iswithinthe rangeshowninTable4.Alsocheck
to besurethe systemis properlycharged(see
outdoorunit InstallationInstructions).If icing
continuesto occur,raisethe selectedairflow
oneor twosteps.

Selecting the Delay Profile--The
delay profile
is selected by setting switches 7 and 8 (see
Table 6). Delay profile selection controls the
start-up and shut-down characteristics of the air
handler. By varying the start-up and shut-down
characteristics
of the air handler the system
can be optimized for energy efficiency, humidity
control, and comfort.
Select "Delay A" or "Delay B" for highest energy
efficiency. "Delay A" has a two-step "on" delay.
The blower will begin operation at 31% airflow
for 30 seconds. The second step operation is
75% airflow for 30 seconds. After the two-step
"on" delay has been completed, the blower
operation will be 100% until the thermostat has
been satisfied. "Delay A" also provides a 60
second "off" delay at 50% airflow.
"Delay B" has a single step 30 second"on" delay at
50% airflow."Delay B"also provides a 90 second
"off" delay at 50% airflow. Select the delay profile
which is most suited to the application.
The "De-Hum." delay profile may be used when
humidity control is desired without the use of
the optional humidistat. If the "De-Hum." delay
profile is selected, the air handler will run at 75%
airflow for the first 10 minutes of each cooling
cycle. If the "De-Hum." delay profile is selected,
the basic cooling/heat-pump
speed should be
selected at or near the top of the range for that
nominal capacity (see Table 4).

Whenoperatingintheheatpumpmode,ahigher
basicairflowsettingwill increasethe energy 8. OPTIONAL HUMIDISTAT
efficiencyandcapacitybut will alsodecrease
(Variable Speed Only)
the supplyairtemperature.
Selecting the Minimum Electric Heat A irflow-The minimum electric heat airflow is selected by
setting switches 5 and 6. Selecting the minimum
electric heat airflow sets the minimum air flow
that will be produced whenever electric heater
kits are used. When the electric heater kits are
energized along with a heat pump, the airflow
may be higher depending on the basic cooling/
heat-pump airflow setting.

The optional humidistat may be installed in the
return air duct to provide excellent humidity
control when needed and maximum system
capacity and energy efficiency when humidity
levels are normal. The humidistat senses when
humidity in the return air stream is above a preset
level (field adjustable) and sends a signal to the
motor to reduce the airflow so that more moisture
may be removed until the humidity level drops.
The air handler is pre-programmed for humidistat
operation. Remove jumper connector installed
between the two terminals marked "HUM" on
the circuit board.

Note: The 15+ SEERair handlersthat are
matchedwith a 2-stagecoolingoutdoorunit
and the humidistatis installedwill not drop
below75%oftheselectedblowerspeedwhen
thesystemisoperatingin Io-coolmodeandthe
humidistatopens.
Installation--Installthehumidistatinthereturn
airductasdirectedintheinstallation
instructions
includedwiththekit.Wirethehumidistat
through
thelow-voltage
wireentranceintheairhandler
(Figure1)tothequick-connect
terminals
marked
"HUM".Wirethe humidistatto openon risein
humidity.

Proper maintenance is most important to achieve
the best performance from an air handler. At a
minimum, this maintenance should include the
following items.
1.

9. CARE AND MAINTENANCE
General -- For continued high performance,
and to minimize the risk of equipment failure, it
is essential that periodic maintenance be performed on this equipment.The ability to properly
perform maintenance on this equipment requires
certain mechanical skills and tools. If you do not
possess these skills, contact your dealer for
maintenance. Consult your local dealer as to
the availability of a maintenance contract.
Do not store any of the following on, or in contact
with, the unit: Rags, brooms, vacuum cleaners,
or other cleaning tools, spray or aerosol cans,
soap powders, bleaches, waxes, cleaning
compounds,
plastics or plastic containers,
paper bags or other paper products, gasoline,
kerosene, cigarette lighter fluid, dry cleaning
fluids, paint thinners, or other volatile fluids.

Inspect and clean or replace the air filter at
the beginning of each heating and cooling
season, or more frequently as required.
Inspect the cooling coil, drain pan, and
condensate drain at the beginning of each
cooling season for cleanliness. Clean these
components as necessary using a mild
detergent and water. Flush the coil, drain
pan, and condensate drain after cleaning
to remove all detergent. Use caution when
cleaning these components so that the
insulation does not become wet.
Inspect the blower motor and wheel for
cleanliness at the beginning of each heating and cooling season. Clean the motor
as necessary.
Inspect electrical connections for tightness
at the beginning of each heating and cooling
season. Service as necessary.

Z WARNING:
Use caution when removing
parts
from this unit. Personal injury can
result from sharp metal edges present in all equipment
of sheet metal
construction.

iNSTALLER: PLEASE LEAVE THESE
iNSTALLATiON iNSTRUCTiONS
WiTH THE HOMEOWNER

lie
llllllMlllllllllllr
iIIIll

708709A (Replaces 7087090)
Specifications and illustrations subject to change
without notice and without incurring obligations.
Printed in U.S.A. (07/07)

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NORDYNE Air Handler (indoor Blower&evap) Manual L0801591

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