Unitary products group FF-10 User manual

CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 4
AGENCY APPROVALS . . . . . . . . . . . . . . . . . . . . . . . . 4
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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 damage may result if
installation procedure is not handled properly.
INSTALLATION
MANUAL
CAUTION: READ ALL SAFETY GUIDES BEFORE YOU
BEGIN TO INSTALL YOUR UNIT.
SAVE THIS MANUAL
035-18877-001-B-0203
SPLIT-SYSTEM HEAT PUMPS
INDOOR UNITS
MODEL: FF-10

035-18877-001-B-0203
2Unitary Products Group
TABLE OF CONTENTS
NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 4
REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
RENEWAL PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
AGENCY APPROVALS. . . . . . . . . . . . . . . . . . . . . . . 4
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LIMITATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LOCATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RIGGING AND HANDLING . . . . . . . . . . . . . . . . . . . . . . . . 6
CLEARANCES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
VERTICAL/HORIZONTAL INSTALLATION. . . . . . . . . . . . 7
DUCT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DRAIN CONNECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
REFRIGERANT MAINS . . . . . . . . . . . . . . . . . . . . . . . . . . 10
INSTALLING REFRIGERANT MAINS . . . . . . . . . . . . . . . . . . . 10
EXPANSION VALVE BULB . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
POWER AND CONTROL WIRING . . . . . . . . . . . . . . . . . 12
SUPPLY AIR BLOWER ADJUSTMENT . . . . . . . . . . . . . 13
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
INDOOR COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DRAIN PAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
BELTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
LIST OF FIGURES
Fig. # Pg. #
1 UNIT SUSPENSION MOUNTING FF-10. . . . . . . . . . . 6
2 VERTICAL AND HORIZONTAL APPLICATION . . . . . 7
3 SUPPLY AIR DUCT CONNECTIONS . . . . . . . . . . . . . 8
4 ELECTRIC HEAT ACCESSORY . . . . . . . . . . . . . . . . . 8
5 RETURN AIR GRILLE FF-10. . . . . . . . . . . . . . . . . . . . 9
6 BASE ACCESSORY FF-10 . . . . . . . . . . . . . . . . . . . . . 9
7 SUPPLY AIR PLENUM FF-10 . . . . . . . . . . . . . . . . . . . 9
8 SUPPLY AIR PLENUM KNOCKOUTS FF-10 . . . . . . . 9
9 RECOMMENDED DRAIN PIPING. . . . . . . . . . . . . . . 10
10 TYPICAL FIELD WIRING . . . . . . . . . . . . . . . . . . . . . 12
11 TYPICAL MOTOR MOUNTING ASSEMBLY. . . . . . . 13
12 HOLE LOCATIONS FOR PRESSURE DROP
READINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
13 CFM VS PRESSURE DROP . . . . . . . . . . . . . . . . . . . 14
14 BLOWER PERFORMANCE CURVE. . . . . . . . . . . . . 15
15 UNIT DIMENSIONS FF-10 . . . . . . . . . . . . . . . . . . . . 17
LIST OF TABLES
Tbl. # Pg. #
1 PHYSICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 APPLICATION DATA. . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 FF-10 UNIT SUSPENSION WEIGHTS (LBS.) . . . . . . 7
4 ELECTRIC HEATER DIMENSIONS FF-10 . . . . . . . . . 9
5 ELECTRICAL DATA - FF-10 . . . . . . . . . . . . . . . . . . . 11
6 ELECTRICAL DATA - UNITS W/ELECTRIC
HEAT ACCESSORY . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 SUPPLY AIR BLOWER MOTOR PULLEY
ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 SUPPLY AIR BLOWER PERFORMANCE FF-10 . . . 15
9 ACCESSORY STATIC RESISTANCE (IWG) . . . . . . 16
10 BLOWER MOTOR DRIVE DATA . . . . . . . . . . . . . . . 16
11 FF-10 MINIMUM CLEARANCES. . . . . . . . . . . . . . . 167

035-18877-001-B-0203
Unitary Products Group 3
NOMENCLATURE
INDOOR SPLIT UPG PRODUCT NOMENCLATURE
FF -10 C 00 S A AA 1 A
Model # Model Number
Description Options
F Product Category L = Air Handling Unit - Cooling F = Air Handling Unit - Heat Pump
F Product Identifier F = R-22 Standard Efficiency 2-Pipe
L = R-22 Standard Efficiency 4-Pipe
-10
Nominal Cooling
Capacity
MBH
-07 = 7-1/2 Ton
-10 = 10 Ton
-15 = 15 Ton
-20 = 20 Ton
CHeatType C = Cooling Only
00 Nominal Heating
Capacity
00 = No Heat Installed
A Airflow Options A = None
S Voltage S = 208/230-460-3-60
A Factory Options A = None
AA Special Options AA = None
1 Generation 1 = First Generation 2 = Second Generation
A Product Style A = Style A B = Style B
*NOT AVAILABLE IN HEAT PUMP

035-18877-001-B-0203
4Unitary Products Group
GENERAL
Every unit includes a well-insulated cabinet, copper tube/alu-
minum fin coil with interlaced circuiting arrangement, 1"
throwaway filters, centrifugal blower with a fixed pitch
sheave, and a blower motor with variable pitch sheave.
They also include a filter drier, expansion valve and distribu-
tor that are only used during the cooling cycle plus a check
valve to provide the proper flow of refrigerant through the unit
during both the cooling and heating cycles.
Supplemental resistance heaters, a supply air plenum, a
return air grille and a base are available as accessories for
field installation.
The controls include 208/230/460 volt transformer, blower
motor contactor and relay, and a low voltage terminal block.
The units are shipped in the vertical position ready for field
installation. For horizontal installation, the blower module can
be repositioned in the field as shown on page 7 for maximum
flexibility.
SAFETY CONSIDERATIONS
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 the installer
that personal injury and/or equipment damage may result if
the installation procedure is not handled properly.
REFERENCE
Additional information on the design, installation, oper-
ation and service of this equipment is available in the
following reference forms.
Form 55.70-N1 - General Installation
Form 55.70-N2 - Pre-start & Post-start Check List
Form 55.70-N3 - General Service Information
Form 55.05-NM - Evacuation and Charging
RENEWAL PARTS
Refer to the Source One Parts Manual for a complete listing
of replacement parts on this equipment.
All forms referenced in this instruction may be ordered from:
Standard Register
2101 W. Tecumseh Rd
Norman, Oklahoma 73069
Toll Free Tel: [phone]
Toll Free Fax: [phone]
This instruction covers the installation of the indoor unit. For
information on the installation and operation of the matching
outdoor unit, refer to 035-18550-001.
AGENCY APPROVALS
Design certified by UL as follows:
1. For use as a cooling/heat pump coil, air handler
only.
2. For indoor installation only.
INSPECTION
As soon as a unit is received, it should be inspected for possi-
ble damage during transit. If damage is evident, the extent of
the damage should be noted on the carrier’s freight bill. A
separate request for inspection by the carrier’s agent should
be made in writing.
Improper installation may create a condition
where the operation of the product could cause
personal injury or property damage.
Improper installation, adjustment, alteration,
service or maintenance can cause injury or
property damage. Refer to this manual for
assistance or additional information, consult a
qualified installer or service agency.
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.

035-18877-001-B-0203
Unitary Products Group 5
TABLE 1: PHYSICAL DATA
DESCRIPTION
UNIT MODEL
FF-10
COIL
ROWS DEEP X ROWS HIGH 3 X 32
FINNED LENGTH - INCHES 54.5
FACE AREA - SQUARE FEET 12.11
TUBE (COPPER) OD - INCHES 3/8
FINS (ALUMINUM) PER INCH 13
CENTRIFUGAL BLOWER (FORWARD CURVE) - QTY DIAMETER X WIDTH - INCHES 18 X 18 - 1
BLOWER MOTOR1
1. Refer to “Blower Motor and Drive Data” table for more information.
HP 2
RPM 1750
FILTERS (THROWAWAY)
QUANTITY PER UNIT 6
SIZE (IN)20 X 20 X 1
TOTAL FACE AREA - SQUARE FEET 16.7
UNIT WEIGHT (LBS)
SHIPPING 425
OPERATING 435
ACCESSORY OPERATING WEIGHT (LBS.)
MOTOR 2 HP ---
ELECTRIC HEAT
10 KW 63
16 KW 66
26 KW 71
36 KW 74
SUPPLY AIR PLENUM 114
RETURN AIR GRILLE 20
BASE 100
TABLE 2: UNIT APPLICATION DATA
APPLICATION
LIMITATIONS MIN. MAX.
VOLTAGE VARIATION (208/230-3-60)1187 253
VOLTAGE VARIATION (460-3-60)1414 506
AMBIENT AIR ON OUTDOOR COIL (COOLING CYCLE) - °F 45 115
AMBIENT AIR ON INDOOR COIL (COOLING CYCLE) - °F 68 86
AMBIENT AIR ON OUTDOOR COIL (HEATING CYCLE) - °F 0270
AMBIENT AIR ON INDOOR COIL (HEATING CYCLE) - °F 60 80
1. Rated in accordance with ARI Standard 110, utilization range “A”.
2. Below 0ºF the control circuit will lock out the compressor and allow the electric heat accessory to cycle at its stand by capacity.

035-18877-001-B-0203
6Unitary Products Group
INSTALLATION
LIMITATIONS
These units must be installed in accordance with all national
and local safety codes. If no local codes apply, installation
must conform with the appropriate national code. Units are
designed to meet National Safety Code Standards. If compo-
nents 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.
See Table 2 for application data.
LOCATION
These indoor units are not designed for outdoor installation.
They must be located within the building structure, either
inside or outside the conditioned space.
The units should be located as close to the outdoor units as
practical and positioned to minimize bends in the refrigerant
piping.
Units being installed vertically or horizontally can be set
directly on a floor or platform, or they can be supported by
metal or wooden beams.
Units being installed horizontally can be suspended from
above. Four 3/8” weld nuts are provided in the unit frame to
accommodate hanger rods. Knockouts must be removed
from the unit panels to expose these weld nuts.
Refer to Figures 1 and 3 for their location and the individual
load on each hanger rod.
A field added secondary drain pan may be required in loca-
tions where possible condensate overflow could cause dam-
age.
RIGGING AND HANDLING
Be careful when moving the unit. Do not remove any packag-
ing until the unit is near its final location.
The packaging consists of a bottom wooden skid that can be
lifted with a fork truck from any direction, a plastic bag that
covers the entire unit, and strapping that secures the plastic
bag to the bottom skid.
These units can be rigged with slings under the bottom skid.
Before rigging any unit, determine its weight from Table 1.
Before rigging a unit for horizontal installation, determine its
center of gravity from Figure 2, and make sure that its weight
will be distributed equally.
Be careful when attaching the hanger rods.
Use a washer with a back-up nut on each rod
and tighten down against the cabinet so they
will not be allowed to turn or slip.
Spreader bars should be used to prevent slings
from crushing the unit panels and frame.
FIGURE 1 - UNIT SUSPENSION MOUNTING FF-10 (HORIZONTAL APPLICATIONS)
3
1-1/2 COIL
SECTION
BLOWER
SECTION
5"
A
D
SUSPENSION
CHANNEL
HANGER RODS
(FIELD SUPPLIED)
C
B
ELECTRIC HEATER
ACCESSORY (40 Lb.)
SUPPLY AIR PLENUM
ACCESSORY (100 Lb.
)
D
58-11/16"
55"

035-18877-001-B-0203
Unitary Products Group 7
CLEARANCES
Refer to the unit dimension details, Figure 15 for clearances
required for servicing and for proper unit operation.
VERTICAL / HORIZONTAL INSTALLATION
The FF-10 unit is shipped for vertical installation with a
vertical air discharge as shown in Figure 2, but may be
converted to other arrangements per the following
instructions:
1. Remove the panels from the blower section.
2. Remove the four Phillips machine bolts that hold
the coil and blower sections together. A bolt is
located near each corner.
3. Move the blower section to the proper location.
4. Attach the blower section to the coil section with
the machine bolts removed in Step 2.
5. Before replacing the panel, see Duct Connection
and Drain Connection.
6. Replace the panels.
TABLE 3: FF-10 UNIT SUSPENSION WEIGHTS (LBS)
SUSP'N. POINT W/ 2 HP MOTOR W/ HEATER ACCESS W/ PLENUM ACCESS W/ HEATER & PLENUM
ACCESS
A95 95 85 85
B120 120 100 100
C95 115 165 185
D115 140 185 205
TOTAL WT.425 470 535 575
FIGURE 2: VERTICAL AND HORIZONTAL APPLICATION

035-18877-001-B-0203
8Unitary Products Group
DUCT CONNECTIONS
All ducts should be designed and installed in accordance with
all national and/or local codes.
Refer to Figure 3 for suggested method of connecting supply
air ductwork.
Ducts should be sized no smaller than the duct flanges on the
unit or the electric heater (if used). Refer to the unit dimen-
sions (Figure 15) and heater detail (Figure 4) for these sizes.
Refer to Form 035-16602-001 for installation instructions on
the electric heater.
Use flexible fiber glass, plastic cloth collars or other nonflam-
mable material at the unit duct connections to minimize the
transmission of noise and vibration.
Insulate all ductwork running through the unconditioned
areas to prevent moisture condensation and to provide more
economical operation.
The return air duct flange is factory-mounted on the front of
the unit, but it can be reversed with the solid bottom panel for
horizontal applications. When the return air grille is used, the
duct connection frame is not used.
A supply air plenum (Figure 7), a base (Figure 6) and a return
air grille (Figure 5) are available as field-installed accesso-
ries, and one of the following respective instructions will be
packed with each.
• Form 035-16650-001 - Supply Air Plenum
• Form 035-16621-001 - Return Air Grille
• Form 035-16632-001 - Base
The supply air plenum and the return air grille should be used
in lieu of ductwork only when a free blow/free return applica-
tion is practical.
FIGURE 3 - SUPPLY AIR DUCT CONNECTIONS
AIR
OUT
NON-FLAMMABLE
COLLAR
FLANGEDDUCT
CONNECTION
(FIELD
FABRICATED)
DUCT
SUPPLYAIR
DUCTFLANGE
BLOWERGASKET
(BYINSTALLER)

FIGURE 4 - ELECTRIC HEAT ACCESSORY
HEATER
ELEMENT
CHAMBER
3/4
A
C
1DLE
F
M
G
H
K
B
ACCESS OPENING FOR POWER SUPPLY WIRING
1/2
W
IRING HARNESS LOCATION
T
his opening in the bottom of the heater
control box is used for the wiring harness
t
hat connects the heater accessory to the
basic unit. It is provided with a squeeze
connector for securing the wiring harness,
and its location corresponds to the loca-
t
ion of the 1-23/32 inch knockout in the top
panel of the basic unit.
CONTROL BOX
ACCESS PANEL
10KW THRU 30KW - Add a 1-1/4 inch conduit fitting
to the 1-23/32 inch hole for wire sizes up through
#1 AWG. Remove the knockout ring and add a
1-1/2 inch conduit fitting to the 1-31/32 inch hole
for wire sizes up through #0 AWG.

035-18877-001-B-0203
Unitary Products Group 9
TABLE 4: ELECTRIC HEATER DIMENSIONS FF-10
HEATER
MODEL
NOM.
kW
Heater Dimensions (inches)
ABCDEFGHKLM
2HS04501025, 46 10
28-1/2 25-1/4 14-1/4 1 4 1/2 5-1/2 1-1/2 1-1/2 22-1/4 19-1/4
2HS04501625, 46 16
2HS04502625, 46 26
2HS04503625, 48 36
FIGURE 5 - RETURN AIR GRILLE FF-10
FIGURE 6 - BASE ACCESSORY FF-10
60-3/4
31
5/
8
24
31-5/8
60-3/4
BASE
FIGURE 7 - SUPPLY AIR PLENUM FF-101
1. Electric Heaters are NOT UL approved for installation
within a SUPPLY AIR PLENUM.
FIGURE 8 - SUPPLY AIR PLENUM KNOCKOUTS
FF-10
1 9 - 7 / 8
1
6 - 1 / 8
2 - 1 / 2
5 5 - 3 / 4
6 0 - 3 / 4
1 - 1 / 8
3 1
1 - 3 / 4
1 9 - 1 / 2 2 7
2 - 1 / 2 K N O C K O U T F O R P O W E R W I R I N G
W H E N E L E C T R I C H E A T E R I S U S E D
3
1 - 1 / 2
1 1 - 1 / 2
K N O C K O U T S F O R P O W E R & C O N T R O L W I R I N G
1 9 - 1 / 2

035-18877-001-B-0203
10 Unitary Products Group
DRAIN CONNECTION
The drain line MUST be trapped because the coil is located
on the negative side of the supply air blower, and it must be
protected from freezing temperatures.
A 7/8” OD drain connections extends through right hand side
of the cabinet. Refer to Figure 9 for recommended drain pip-
ing.
The drain connection is located on the same side of the unit
as the refrigerant connections. The line should be insulated
where moisture drippage will be objectionable or cause dam-
age to the area.
The 3” dimension must equal or exceed the negative static
pressure developed by the supply air blower. If it does not the
condensate will not drain properly and may overflow the drain
pan. The trap must be at least 2-1/2” deep to maintain a
water seal under all operating conditions, especially during
blower start-up.
NOTE: The unit may have to be raised off the floor to allow
enough height for the trap.
REFRIGERANT MAINS
Many service problems can be avoided by taking adequate
precautions to provide an internally clean and dry system and
by using procedures and materials that conform with estab-
lished standards.
Use hard drawn copper tubing where no appreciable amount
of bending around pipes or other obstructions is necessary.
Use long radius ells wherever possible with one exception -
small radius ells for any traps in a vapor riser. If soft copper is
used, care should be taken to avoid sharp bends which may
cause a restriction.
Fiber glass insulation and a sealing material such as perma-
gum should be packed around refrigerant lines where they
penetrate a wall to reduce vibration and to retain some flexi-
biltiy.
Support all refrigerant lines at minimum intervals with suitable
hangers, brackets or clamps.
Braze all copper to copper joints with Sil-Fos 5 or equivalent
brazing material. DO NOT USE SOFT SOLDER.
Never braze or solder the liquid and vapor lines together for
support purposes, they must be completely insulated, one
from the other.
Refer to the installation instructions (035-18549-001) for the
matching outdoor unit for piping limitations, line sizes and
other design considerations.
INSTALLING REFRIGERANT MAINS
The units are evacuated and dehydrated at the factory and
shipped with a holding charge of Refrigerant-22. The suction
and liquid connections are sealed with copper discs. Refer to
the appropriate condensing unit installation instructions for
charging data.
Before starting installation of the mains be sure the unit has
not developed a leak in transit by drilling a small hole in the
sealing discs. If pressure still exists, the circuit may be con-
sidered leak free. If pressure does not exist the coil should be
leak tested.
NOTE: To minimize the possibility of system failure
due to dirt and moisture, a filter-drier must be
installed in the liquid line as close to the evap-
orator as possible. Filter-driers are not sup-
plied with the evaporator blowers. They are
supplied with the matching condensing sec-
tions.
If solenoid valves are required, they must be purchased and
installed in the field. The temperature required to make or
break a brazed joint is sufficiently high to cause oxidation of
the copper unless an inert atmosphere is provided.
The liquid and suction connections must be piped outside the
unit. Refer to the unit drawing for locations and the dimen-
sions of these connections.
FIGURE 9 - RECOMMENDED DRAIN PIPING
5
2 - 1 / 2
P L A S T I C
E L L
STEEL
S T U B
C O N N E C T I O N
H O S E C L A M P S
E V A P O R A T O R
C O I L
D R A I N P A N
D R A I N
P L U G
Dry nitrogen should flow through the system at
all times when heat is being applied and until
the joint has cooled.

035-18877-001-B-0203
Unitary Products Group 11
Before brazing the refrigerant lines to these connections,
remove the short panel from the unit frame and slide it (along
with the grommets) onto the refrigerant lines. After the brazed
joints have cooled, slide the panel back into place and secure
it to the unit frame.
NOTE: These units can only be piped from one side of the
unit.
EXPANSION VALVE BULB
The expansion valve bulb must be fastened in a 10 or 2
o'clock position to the suction line outside the cabinet after
the piping connections have been made.
Use the clamps provided with the valve to secure the bulb in
position. Bulb must be insulated with armaflex or mastic to
assure proper operation.
NOTE: These coils can only be piped from one side of the
unit.
TABLE 5: ELECTRICAL DATA - FF-10
Blower
Motor HP Power Supply FLA Max. Fuse
Size1AMPS
1. Dual element, time delay fuses.
2
208-3-60 7.5 15
230-3-60 6.8 15
460-3-60 3.4 15
Note: Refer to Form 035-16602-001 for electrical data on units equipped
with an electric heat accessory.
TABLE 6: ELECTRICAL DATA - UNITS WITH ELECTRIC HEAT
Model Basic Unit1Nominal Heater
KW2
Power Supply
Voltage3
Full Load Amps Total Ampacity,
Amps
Max. Fuse Size4,
Amps
Heater Blower Motor
120
10
208 20.8 7.5 35.4 35
230 24.1 6.8 37.3 40
460 12.0 3.4 19.2 20
16
208 33.3 7.5 51.1 50
230 38.5 6.8 54.6 60
460 19.2 3.4 26.1 30
26
208 54.1 7.5 77.1 80
230 62.5 6.8 83.4 90
460 31.3 3.4 41.7 45
36
208 74.9 7.5 103.2 110
230 86.6 6.8 112.2 125
460 43.3 3.4 56.1 60
1. Units with an electric heat accessory will always be wired for a single power supply.
2. Refer to the HEATING CAPACITY table for the actual KW and MBH ratings of each heater at the different voltages.
3. All voltages are for 3-phase, 60 hertz operation.
4. Inverse time circuit breakers may be used in lieu of dual element, time delay fuses.

035-18877-001-B-0203
12 Unitary Products Group
POWER AND CONTROL WIRING
Install electrical wiring in accordance with the latest National
Electrical Code (NFPA standard No. 70) and/or local regula-
tions. The unit should be grounded in accordance with these
codes.
Route the power wires into the unit through the 1-3/8” knock-
out in the rear panel, and connect them to the terminals on
blower motor contactor 10M. Route the control wires into the
unit through the 7/8” hole in the rear panel, and connect them
to the terminals on block 4TB. Refer to the unit drawing in
Figure 15 for the location of these knockouts.
CONTROL WIRE SIZING
To determine the total circuit length, add the follow-
ing distances:
1 - Outdoor Unit to Indoor Unit _____________
2 - Indoor Unit to Thermostat _____________
3 - Thermostat to Indoor Unit _____________
4 - Indoor Unit to Outdoor Unit _____________
5 - Outdoor Unit to Elec. Heater _____________
Total Circuit Length _____________
If the unit includes and electric heat accessory, route the
power wires into heater control box in lieu of the unit. Refer to
the electric heat instruction Form 035-16602-001 for addi-
tional installation information.
Refer to Table 5 to size the disconnect switch, the power wir-
ing, the fuses and the control wiring. Refer to Figure 10 for
field wiring diagrams.
NOTE: Motors are wired for a 460V power supply. Refer to
the wiring diagram inside the motor terminal box
when reconnecting motor leads for a 208 or 230 volt
power supply.
Wire Size
Maximum Total
Circuit Length
(Feet)
#19 Solid
#18 Solid
#18 Stranded
#16 Stranded
#14 Stranded
#12 Stranded
130
170
180
270
455
730
FIGURE 10 -TYPICAL FIELD WIRING
035-16602-001

035-18877-001-B-0203
Unitary Products Group 13
SUPPLY AIR BLOWER ADJUSTMENT
The RPM of the supply air blower will depend on the required
CFM, the unit accessories and the static resistances of both
the supply and the return air duct systems. With this informa-
tion, the RPM for the supply air blower can be determined
from the blower performance in Table 8.
Knowing the required blower RPM and the blower motor HP,
the settings (turns open) for the supply air motor pulley can
be determined from Table 7.
Each motor pulley has:
1. A threaded barrel with two flats (or notched recesses)
180° apart.
2. A movable flange with one set screw.
After the movable flange has been rotated to the proper num-
ber of “turns open”, the set screw should be tightened against
the flat on the barrel to lock the movable flange in place. If
the pulley includes a locking collar, the locking collar must be
loosened to adjust the setting of the movable flange.
Note the following:
1. The supply air CFM must be within the limitations shown
in Table 8.
2. All pulleys can be adjusted in half turn increments.
3. The tension on the belt should be adjusted for a deflec-
tion of 3/16” per foot of belt span with an applied force of
2 to 3 pounds. This adjustment is made by moving the
blower motor mounting plate. Refer to Figure 11. Turning
the adjustment bolt (B) moves the motor mounting plate
up or down. Two hex nuts (A) have to be loosened to
move the mounting plate and retighten after the mount-
ing plate has been moved to the proper position.
NOTE: Never loosen the two nuts (C) (shown in Figure 11).
4. All pulleys are factory aligned.
5. All supply air motor pulleys are factory set at 3 “turns
open”.
After the supply air blower motor is operating, adjust the
resistances in both the supply and the return duct system to
balance the air distribution throughout the conditioned space.
The job specification may require that this balancing be done
by someone other than the equipment installer.
To check the supply air CFM after the initial balancing has
completed:
1. Drill two 5/16” holes in the side panel as shown in
Figure 12.
2. Insert at least 6” of 1/4” tubing into each of these holes
for sufficient penetration into the air flow on both sides of
the indoor coil.
NOTE: The tubes must be inserted and held in a position
perpendicular to the air flow so that velocity pres-
sure will not affect the static pressure reading.
3. Using an inclined manometer, determine the pressure
drop across a dry indoor coil. Since moisture on the coil
may vary greatly, measuring the pressure drop across a
wet coil under field conditions would be inaccurate. To
assure a dry coil, the heat pump system should be de-
activated while the test is being run.
4. Knowing the pressure drop across a dry coil the actual
CFM through the unit can be determined from the curve
in Figure 13.
TABLE 7: SUPPLY AIR BLOWER MOTOR PULLEY
ADJUSTMENT
TURNS
OPEN
DRIVE RANGE
550-730 RPM
5550
4580
3620
2655
1690
0730
FIGURE 11 -TYPICAL MOTOR MOUNTING ASSEM-
BLY
B
A
(DO NOT LOOSEN)
MOTOR
MOTOR MOUNT
C

035-18877-001-B-0203
14 Unitary Products Group
If the CFM is above or below the specified value, the supply
air motor pulley may have to be re-adjusted. After one hour of
operation, check the belt and pulleys for tightness and align-
ment.
After readings have been obtained remove the tubes and
seal up the drilled holes in the side panel. Dot plugs (5/16” -
P/N 029-13880-000) are available through Source One Parts
ordering procedures.
NOTE: Shut down the heat pump system before taking any
test measurements to assure a dry indoor coil.
FIGURE 12 -HOLE LOCATIONS FOR PRESSURE
DROP READINGS
5 / 1 6
H O L E
5 / 1 6
H O L E
18
7
22
10
E V A P O R A T O R
C O I L
F I L T E R S
C O I L S E C T I O N
Failure to properly adjust the total system CFM
can result in extensive blower damage or sys-
tem damage.
FIGURE 13 -CFM VS PRESSURE DROP
FF-10
0
0.05
0.1
0.15
0.2
0.25
1500 2500 3500 4500 5500 6500
CFM
Coil Pressure Drop
IWG

035-18877-001-B-0203
Unitary Products Group 15
TABLE 8: SUPPLY AIR BLOWER PERFORMANCE FF-101,2
10 TON BLOWER PERFORMANCE
ESP CFM RPM Watts CFM RPM Watts CFM RPM Watts CFM RPM Watts CFM RPM Watts CFM RPM Watts
0.2 - - - 5775 680 2168 5402 650 1851 4990 616 1516 4571 582 1281 4250 548 1097
0.4 5521 713 2283 5409 684 1954 4810 653 1633 4326 618 1307 3785 582 1069 3484 550 903
0.6 4864 718 2006 4736 688 1695 4098 657 1353 3411 622 1052 2635 586 826 - - -
0.8 4221 722 1695 3780 693 1393 2860 661 1019 - - - - - - - - -
1 3223 728 1376 2625 697 1097 - - - - - - - - - - - -
0 turns 1 turn 2 turns 3 turns 4 turns 5 turns
Exceeds Amperage rating of motor.
1. Motors can be selected to operate into the service factor because they are located in the moving air stream, upstream of any heating device.
2. Available static pressure in IWG to overcome the resistance of the duct system and any accessories added to the unit. Refer to Table 9 for the resis-
tance of these accessories and for additional motor and drive data. Note: Refer to Form 515.41-AD1 for blower performance curves.
FIGURE 14 -BLOWER PERFORMANCE CURVE
FF-10
3000
3500
4000
4500
5000
5500
6000
6500
7000
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1
External Static "WC
CFM
0 turns
1 turn
2 turns
3 turns
4 turns
5 turns
0 Turns
1 Turn
2 Turns
3 Turns
4 Turns
5 Turns

035-18877-001-B-0203
16 Unitary Products Group
TABLE 9: ACCESSORY STATIC RESISTANCE (IWG)
Model Accessory Static Resistance, IWG
Blower CFM 3200 3600 4000 4400 4800
FF-10
Electric Heat
10KW0.020.020.030.030.04
16KW0.030.040.050.060.07
26KW 0.06 0.07 0.09 0.11 0.13
36KW 0.09 0.11 0.14 0.17 0.20
Supply Air Plenum 0.05 0.06 0.07 0.08 0.10
Return Air Grille 0.05 0.06 0.07 0.08 0.10
TABLE 10: BLOWER MOTOR DRIVE DATA
Model Motor HP1Blower
RPM
Adjustable Motor Pulley Fixed Blower Pulley Belt
Pitch Dia.
(Inches)
Bore
(Inches)
Pitch Dia.
(Inches)
Bore
(Inches)
Designa-
tion
Pitch Lg.
(Inches)
FF-10 2 550-730 2.8-3.8 7/8 9.5 1 A55 56.3
1. These factory-mounted motors are wired for a 460V power supply. Refer to the wiring diagram inside the motor terminal box when
reconnecting the motor leads to a 208 or 230 volt power supply.

035-18877-001-B-0203
Unitary Products Group 17
FIGURE 15 -UNIT DIMENSIONS FF-10
2 7 - 5 / 8
2 - 3 / 8
2 - 3 / 1 6
5 6 - 3 / 8
1
2 - 3 / 1 6
3 1 - 5 / 8
3 - 1 / 8
6 2 - 5 / 8
1 - 1 / 4 " K N O C K O U T
F O R 7 / 8 " O D D R A I N
C O N N E C T I O N *
( M u s t b t r a p p d )
F I L T E R A C C E S S P A N E L
F i l t r s c a n b r m o v d
t h r o u g h i t h r s i d o f
t h u n i t .
1 - 1 / 4 " K N O C K O U T F O R
5 / 8 " O D L I Q U I D C O N N E C T I O N *
C O I L
S E C T .
6 - 1 / 4 3 - 1 / 8
3 - 1 / 8 1 9
1 0
2 - 1 / 8
2 - 5 / 8 "
K N O C K -
O U T F O R
1 - 5 / 8 " O D
S U C T I O N
C O N N . *
3 2 - 3 / 8
1 8 - 7 / 8
6
5 - 1 / 2
5 - 7 / 8
B L O W E R
S E C T I O N
7 - 1 / 4 1 6 - 1 / 2
7 / 8
1 9 - 3 / 8 2 1 - 7 / 8
6 0 - 3 / 4
B L O W E R M O T O R A N D D R I V E A C C E S S P A N E L
( A l w a y s o n t h w i r i n g c o n n c t i o n s i d o f u n i t )
L o c a t d o n o p p o s i t s i d O N L Y w h n t h b l o w r
s c t i o n h a s b n r o t a t d 1 8 0 f r o m p o s i t i o n s h o w n .
1 - 2 3 / 3 2 " K N O C K O U T
R m o v o n l y w h n E l c t r i c
H a t A c c s s o r y i s u s d .
7 / 8 " K N O C K O U T F O R P O W E R W I R I N G
D o n o t r m o v t h i s k n o c k o u t w h n t h u n i t i s q u i p p d w i t h a n E l c t r i
c
H a t A c c s s o r y . R f r t o d t a i l o f t h H a t r A c c s s o r y f o r p o w r
w i r i n g a c c s s o p n i n g
7 / 8 " K N O C K O U T F O R
C O N T R O L W I R I N G
A L T E R N A T E
2 - 5 / 8 " K N O C K O U T *
* R f r t o I N S T A L L I N G R E F R I G E R A N T M A I N S i n i n s t a l l a t i o n i n s t r u c t i o n
w h n p i p i n g t h r o u g h t h o p p o s i t s i d o f t h u n i t .
A I R
O U T
A I R
I N
All dimensions are in inches. They are sub-
ject to change without notice. Certified dimen-
sions will be provided upon request.
Accessories
• ELECTRIC HEATERS - Add 14-1/4” to unit height when using 10,
16, 26 or 36 KW heater.
Add 21-3/4” to unit height when using 72 KW heater.
• SUPPLY AIR PLENUM - Add 27-1/2” to unit height when used.
• BASE - Add 24” to unit height when used.
• HOT WATER OR STEAM COIL - Add 6” to unit depth when used.
TABLE 11: FF-10 MINIMUM CLEARANCES
Side with RETURN AIR opening 24”
Side with SUPPLY AIR opening 24”1
Side with PIPING CONNECTIONS 61”2
Side with access to both POWER & CONTROL WIRING -3
Bottom -4
1. Overall dimensions of the unit will vary if an electric
heater, a supply air plenum or a base is used.
2. This dimension is required for removal of the coil. Only
26” is required for normal service.
3. If the coil has to be removed, this dimension is required
to loosen screws that secure the coil to the unit frame.
This dimension will also be required for blower motor
access if the piping connections are made on the oppo-
site side of the unit.
4. Allow enough clearance to trap the condensate drain
line.

035-18877-001-B-0203
18 Unitary Products Group
MAINTENANCE
INDOOR COIL
Do not allow dirt to accumulate on the indoor coil or other
parts of the supply/return air circuit. Clean as often as neces-
sary to assure good system performance. Use a brush vac-
uum cleaner attachment or other suitable means.
If the coil becomes extremely dirty, it may be necessary to
use an industrial grade detergent and a hose to clean the
finned surfaces. This is recommended to prevent any loss in
capacity and efficiency.
FILTERS
The filters must be replaced as often as necessary to assure
good air flow and filtering action. Clean filters will prevent any
loss in capacity and efficiency.
Refer to the unit drawing in Figure 15 for the location of the
filter access panel.
DRAIN PAN
The condensate drain pan should be inspected regularly to
assure proper drainage.
LUBRICATION
The bearings for the blower shaft and the blower motor are
permanently lubricated and should not require any additional
lubricant.
BELTS
Maintain belt tension to extend belt life. Replace the signs if
failure begins to appear.

035-18877-001-B-0203
Unitary Products Group 19

Subject to change without notice. Printed in U.S.A. 035-18877-001-B-0203
Copyright © by Unitary Products Group 2003. All rights reserved. Supersedes: 035-18877-001-A-0802
Unitary 5005 Norman
Products York OK
Group Drive 73069