Unitary products group FF-07 User manual

INSTALLATION
MANUAL
CAUTION: READ ALL SAFETY GUIDES BEFORE YOU
BEGIN TO INSTALL YOUR UNIT.
SAVE THIS MANUAL
MODEL: FF-07
SPLIT-SYSTEM HEAT PUMPS
INDOOR UNITS
035-18548-001-B-0203
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 dam-
age may result if installation procedure is not handled
properly.

035-18548-001-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. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
REFRIGERANT MAINS . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
INSTALLING REFRIGERANT MAINS . . . . . . . . . . . . . . . . . . . 10
EXPANSION VALVE BULB . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
POWER AND CONTROL WIRING . . . . . . . . . . . . . . . . . 10
SUPPLY AIR BLOWER ADJUSTMENT . . . . . . . . . . . . . 12
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
INDOOR COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DRAIN PAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
BELTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
LIST OF FIGURES
Fig. # Pg. #
1 UNIT SUSPENSION MOUNTING . . . . . . . . . . . . . . . . 7
2 VERTICAL AND HORIZONTAL APPLICATION . . . . . 8
3 SUPPLY AIR DUCT CONNECTIONS . . . . . . . . . . . . . 8
4 ELECTRIC HEATER ACCESSORY . . . . . . . . . . . . . . 8
5 SUPPLY AIR PLENUM ACCESSORY . . . . . . . . . . . . 9
6 BASE ACCESSORY . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 RETURN AIR GRILLE ACCESSORY . . . . . . . . . . . . . 9
8 RECOMMENDED DRAIN PIPING. . . . . . . . . . . . . . . . 9
9 FIELD WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
10 TYPICAL MOTOR MOUNTING ASSEMBLY. . . . . . . 13
11 HOLE LOCATIONS FOR PRESSURE DROP
READINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
12 PRESSURE DROP ACROSS A DRY INDOOR
COIL VS. SUPPLY AIR CFM. . . . . . . . . . . . . . . . . . . 14
13 FA090 AIRFLOW CHART . . . . . . . . . . . . . . . . . . . . . 15
14 UNIT DIMENSIONS & CLEARANCES . . . . . . . . . . . 17
LIST OF TABLES
Tbl. # Pg. #
1 PHYSICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 APPLICATION DATA. . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 ELECTRICAL DATA - UNITS W/ELEC. HEAT ACC. 11
5 SUPPLY AIR BLOWER MOTOR PULLEY
ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 SUPPLY AIR BLOWER PERFORMANCE . . . . . . . . 15
7 ACCESSORY STATIC RESISTANCE (IWG) . . . . . . 16
8 BLOWER MOTOR AND DRIVE DATA . . . . . . . . . . . 16

035-18548-001-B-0203
Unitary Products Group 3
NOMENCLATURE
INDOOR SPLIT UPG PRODUCT NOMENCLATURE
FF -07 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
-07
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

035-18548-001-B-0203
4Unitary Products Group
GENERAL
These completely assembled indoor units include a
well-insulated cabinet, a copper tube/aluminum fin coil,
throwaway filters, a centrifugal blower, a blower motor,
an adjustable V-belt drive, a blower motor contactor
and a small holding charge of Refrigerant-22. They
also include a filter-drier, an expansion valve and a dis-
tributor that are only used during the cooling cycle plus
check valves to provide the proper flow of refrigerant
through the coil during both the cooling and heating
cycles.
Supplemental resistance heaters, a supply air plenum,
a return air grille and a base are available as accesso-
ries for field installation.
The units are shipped in the vertical position ready for
field installation. For horizontal installation, reverse the
solid bottom panel and the return air duct flange on the
front of the unit.
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 proce-
dure 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 Parts Manual for complete listing of replace-
ment 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 PN 035-18547-001.
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
possible damage during transit. If damage is evident,
the extent of the damage should be noted on the car-
rier's freight bill. A separate request for inspection by
the carrier's agent should be made in writing. See Form
50.15-NM for more information.
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.

035-18548-001-B-0203
Unitary Products Group 5
TABLE 1: PHYSICAL DATA
Evaporator Coils
Description Unit Model FF-07
Rows Deep x Rows Wide 3 x 32
Finned Length - inches 46
Face Area - square feet 10.1
Tube OD - inches 3/8
Fins per inch 13
Centrifugal Blower
(Forward Curve)
Diameter x Width - inches 15 x 15
Motors1Nominal HP Rating 1-1/2
Filters (Throwaway) Quantity Per Unit 16" x 25" x 1 4
Face Area - square feet 11.1
Distributor One Per Unit 5-3-10-122
Operating Weight, Lbs.3
Holding Charge 9.5 oz.
Basic Unit 385
Accessories
Supply Air Plenum 102
Return Air Grille 15
Hot Water Coil 82
Steam Coil 85
Base 60
Electric Heat:
10 KW 63
16 KW 66
26 KW 71
36 KW 74
Hot Water Coil
Tubes OD, inches 1/2 (Copper)
Rows Deep 2
Fins Per Inch 12 (Aluminum)
Face Area, square feet 6.8
Connections (Supply & Return) 1" NPTE
Steam Coil
Outer Tube OD, inches 1 (Brass)
Rows Deep 1
Fins Per Inch 8 (Aluminum)
Face Area - square feet 6.6
Connection Inlet 1-1/2" NPTE
Outlet 1-1/2" NPTE
Electric Heat
Heater
Elements
% Nickel 59.2
%Chromium 16.0
watts/sq. in. 59.0
Face Area, square feet 3.0
1. Refer to Blower Motor and Drive Data for additional blower motor and drive information. All of these 1750 RPM motors have a solid base, a 56 frame,
a 1.15 service factor, inherent protection & permanently lubricated ball bearings.
2. The first digit refers to inlet diameter (1/8:), second digit refers to tube diameter (1/16”) and the third digit refers to number of tubes and the fourth digit
refers to number of distributors.
3. Refer to Figure 1 and Table 3 for distributed weight of Evaporator Blower Unit.
TABLE 2: APPLICATION DATA
Model Power Supply
Voltage
Variation1
Supply Air
CFM
Entering Air Temperatures, ºF
Cooling - wb Heating - db
Min. Max. Min. Max. Min. Max. Min. Max.
FF-07 208/230-3-60 187 252 2400 3600 57 72 50280
460-3-60 414 506
1. Utilization Range “A” in accordance with ARI Standard 110.
2. The system may operate below 50º F for a short period of time when warming up the conditioned space after a long shutdown.

035-18548-001-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
codes. Units are designed to meet National Safety
Code Standards. If components are to be added to a
unit to meet local codes, they are to be installed at the
dealer's and/or the customer's expense. See Table 2
for application data.
LOCATION
These Evaporator Blowers are not designed for out-
door installation. They must be located within the build-
ing structure, either inside or outside the conditioned
space.
These Evaporator Blower sections allow for vertical or
horizontal installation in any area offering proper elec-
trical supply, duct and drain connections.
They may be installed either with ductwork or matching
plenum and inlet grille.
The units should be located as close to the condensing
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 metal or wooden
beams can support them.
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 Figure 1 for their location and the individ-
ual load on each hanger rod.
A field added secondary drain pan may be required in
locations where possible condensate overflow could
cause damage.
RIGGING AND HANDLING
Be careful when moving the unit. Do not remove any
packaging 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 card-
board container that covers the entire unit, and strap-
ping that secures the cardboard container 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, deter-
mine its center of gravity from Figure 1 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 the
slings from crushing the unit panels and frame.

035-18548-001-B-0203
Unitary Products Group 7
FIGURE 1 - UNIT SUSPENSION MOUNTING (Horizontal Application)
CLEARANCES
The clearances listed on the unit dimension drawing
(Figure 14) are required for the proper service and
operation of the unit.
VERTICAL/HORIZONTAL INSTALLATION
These evaporator blowers are shipped for vertical installation
with vertical air discharge as shown in Figure 2(A) but may be
converted for horizontal installation as shown in Figure 2(B)
by interchanging the solid bottom panel and the return air
duct flange.
NOTE: Certain blower positions are not recommended
because the blower motor should not be mounted upside
down.
Model Accessory
Based on a Standard Blower Motor
Center of Gravity
Dimensions, In.
Weight
Distribution, Lbs.
A B W1 W2 W3 W4 Total
FF-07
Basic Unit Only 24-1/8 23-1/4 112 102 89 82 385
Unit with Electric Heat 29-1/4 23-3/8 100 150 81 122 453
Unit with Plenum 33-3/8 23-1/2 85 184 68 150 487
Unit with Electric Heat and Plenum 36-5/8 23-5/8 74 230 61 190 555
NOTE: Unit weights (with electric heat accessory) are based on an average heater weight of 68 lbs.
FIGURE 2 - VERTICAL AND HORIZONTAL
APPLICATION
AIR
OUT
AIR
OUT
BLOWER BLOWERMOTOR
LOCATION
COIL
RETURNAIR
DUCTFLANGE
AIR
IN SOLID
BOTTOMPANEL
BLOWER
RETURNAIR
DUCTFLANGE
SOLID
BOTTOMPANEL
AIR
IN
COIL
BLOWERMOTOR
LOCATION
HORIZONTAL
POSITION
VERTICAL
POSITION
(A)
(
B
)

035-18548-001-B-0203
8Unitary Products Group
DUCT CONNECTIONS
All ducts should be designed and installed in accor-
dance 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 dimensions (Figure 14) and the heater detail (Fig-
ure 4) for these sizes. Refer to Form 035-16602-001
for installation instructions on the electric heater.
Use flexible fiber glass or plastic cloth collars or other
non-flammable material at the unit duct connections to
minimize the transmission of noise and vibration.
Insulate all ductwork running through 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.
A supply air plenum (Figure 5), a base (Figure 6) and a
return air grille (Figure 7) are available as field-installed
accessories, and one of the following respective
instructions will be packed with each.
PN 035-16650-001 - Supply Air Plenum
PN 035-16621-001 - Return Air Grille
PN 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 application 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 HEATER ACCESSORY
(VERTICAL ARRANGEMENT SHOWN)
FIGURE 5 - SUPPLY AIR PLENUM ACCESSORY
(VERTICAL ARRANGEMENT SHOWN)
FIGURE 6 - BASE ACCESSORY
(FOR VERTICAL ARRANGEMENT
ONLY)
1" DUCT FLANGE
HEATER ELEMENT
CHAMBER CONTROL BOX
ACCESS PANEL
SUPPLY
AIR
A
VERTICAL ARRANGEMENT
SHOWN
B
BLOWER
UNIT
ALTERNATE
AIR DISCHARGE
BLOWER
UNIT
SUPPLY
AIR
TOP
PANEL
GRILLE
VERTICAL
ARRANGEMENT
SHOWN
Plenum should be field mounted on the supply air end of blower
units for either vertical or horizontal application. For rear discharge,
rotate plenum 180 degrees. For horizontal discharge on a horizontal
unit, the grille panel and the top panel will be arranged differently.
Refer to Form for installation and assembly instructions.
035-16650-001
BLOWER
UNIT
BLOWER UNIT
BASE PANEL
FOR VERTICAL
ARRANGEMENT
ONLY
WHEN OUTDOOR AIR IS REQUIRED, A HOLE CAN BE
CUT IN BACK PANEL FOR CONNECTING DUCTWORK.

035-18548-001-B-0203
Unitary Products Group 9
\
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 connection extends through right hand
side of cabinet. Refer to Figure 8 for recommended
drain piping.
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 objection-
able or cause damage to the area.
The 3” dimension must be equal or exceed the nega-
tive 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 ade-
quate precautions to provide an internally clean and
dry system and by using procedures and materials that
conform with established 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
permagum should be packed around refrigerant lines
where they penetrate a wall to reduce vibration and to
retain some flexibility.
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 SOL-
DER.
Never braze or solder the liquid and vapor lines
together. The complete vapor line should be insulated
with minimum 1/2” ARMAFLEX or equivalent.
If it is desirable to fasten these lines together for sup-
port purposes, they must be completely insulated, one
from the other.
Refer to the appropriate condensing unit installation
instructions for the matching outdoor unit for piping lim-
itations, 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
FIGURE 7 - RETURN AIR GRILLE ACCESSORY
(VERTICAL ARRANGEMENT SHOWN)
FIGURE 8 - RECOMMENDED DRAIN PIPING
VERTICAL
ARRANGEMENT
SHOWN







 








035-18548-001-B-0203
10 Unitary Products Group
hole in the sealing discs. If pressure still exists, the cir-
cuit may be considered 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 pur-
chased 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 out-
side the unit. Refer to the unit drawing for locations and
the dimensions of these connections.
Before brazing the refrigerant lines to these connec-
tions, 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.
POWER AND CONTROL WIRING
Install electrical wiring in accordance with the latest
National Electrical Code (NFPA standard No. 70) and/
or local regulations. The unit should be grounded in
accordance with these codes.
Route the power wires into the unit through the 1-3/8”
knockout in the rear panel, and connect them to the ter-
minals on blower motor contactor 10M. Route the con-
trol wires into the unit through the 7/8” hole in the rear
panel, and connect them to the terminals on block TB1.
Refer to the unit drawing in Figure 14 for the locations
of these knockouts.
Dry nitrogen should flow through the system at
all times when heat is being applied and until
the joint has cooled.

035-18548-001-B-0203
Unitary Products Group 11
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 an electric heat accessory, route the
power wires into heater control box in lieu of the unit.
Refer to Table 3 to size the disconnect switch, the
power wiring, the fuses and the control wiring. Refer to
Figure 9 for field wiring diagram.
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.
If the supply air blower rotates in the wrong
direction, reverse two of the motor leads at
blower motor contactor 10M.
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
TABLE 3: ELECTRICAL DATA
Blower
Motor
HP
Power
Supply FLA
Max. Fuse
Size,1
AMPS
1. Dual element, time delay fuses.
FF-07
1-1/2
208-3-60 5.2 15
230-3-60 5.0 15
460-3-60 2.6 15
TABLE 4: ELECTRICAL DATA - UNITS WITH ELECTRIC HEAT ACCESSORY
Model Basic
Unit1
Nominal
Heater KW2
Power Supply
Voltage3
Full Load Amps Total Ampacity (Amps) Max Fuse Size4,
Amps
Heater Blower Motor
FF-07
10
208 20.8 5.2 32.6 35
230 23.1 5.0 35.1 40
460 11.5 2.6 17.7 20
16
208 33.4 5.2 48.2 50
230 36.9 5.0 52.4 60
460 18.4 2.6 26.3 30
26
208 54.2 5.2 74.3 80
230 59.9 5.0 81.2 90
460 30.0 2.6 40.7 45
36
208 75.1 5.2 100.3 110
230 83.0 5.0 110 125
460 41.5 2.6 55.1 60
1. Units with an electric heat accessory will always be wired for a single power supply.
2. Refer to HEATING CAPACITY table for the actual KW and MBH ratings of each heater at the different voltages.
3. All voltages for 3-phase, 60 hertz operation.
4. Inverse time circuit breakers may be used in lieu of dual element, time delay fuses.

035-18548-001-B-0203
12 Unitary Products Group
FIGURE 9 - FIELD WIRING
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035-18548-001-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 resis-
tances of both the supply and the return air duct sys-
tems. With this information, the RPM for the supply air
blower can be determined from the blower perfor-
mance in Table 6.
Knowing the required blower RPM and the blower
motor HP, the setting (turns open) for the supply air
motor pulley can be determined from Table 5.
* Pulleys can be adjusted in half-turn increments.
Each motor pulley has:
1. A threaded barrel with two flats (or notched
recesses) 180 degrees apart.
2. A movable flange with one set screw.
After the movable flange has been rotated to the
proper number of “turns open”, the set screw should be
tightened against the flat on the barrel to lock the mov-
able flange in place. If the pulley includes a locking col-
lar, 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 2.
2. All pulleys can be adjusted in half-turn increments.
3. The tension on the belt should be adjusted for a
deflection od 3/16 of an inch per foot of belt span
with an applied force of 2 to 3 pounds. This adjust-
ment is made by moving the blower motor mount-
ing plate. Refer to Figure 10. Turning the
adjustment bolt (B) moves the motor mounting
plate up or down. Note - Never loosen the two nuts
(C). Two hex nuts (A) have to be loosened to move
the mounting plate and retightened after the
mounting plate has been moved to the proper posi-
tion.
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
systems to balance the air distribution throughout the
conditioned space. The job specifications 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 been completed:
1. Drill two 5/16 inch holes in the side panel as shown
in Figure 11.
2. Insert at least 6” of 1/4 inch 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 posi-
tion perpendicular to the air flow so that veloc-
ity pressure will not affect the static pressure
readings.
TABLE 5: SUPPLY AIR BLOWER MOTOR PULLEY
ADJUSTMENT
TURNS
OPEN*
DRIVE RANGE
FF-07
690 - 920
5 690
4 730
3 770
2 815
1 850
0 920
FIGURE 10 - TYPICAL MOTOR MOUNTING
ASSEMBLY
B
A
(DO NOT LOOSEN)
MOTOR
MOTOR MOUNT
C

035-18548-001-B-0203
14 Unitary Products Group
3. Using an inclined manometer, determine the pres-
sure drop across a dry indoor coil. Since moisture
on the coil may vary greatly, measuring the pres-
sure 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 a unit can be determined from
the curve in Figure 12.
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 alignment.
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 normal York parts ordering procedures.
NOTE: Shut down the heat pump system before tak-
ing any test measurements to assure a dry
indoor coil.
FIGURE 11 - HOLE LOCATIONS FOR PRESSURE
DROP READINGS
5/16"
HOLE
5/16"
HOLE
C
A
EVAPORATOR
COIL
FILTERS
B
D
AIR
IN
Failure to properly adjust the total system CFM
can result in extensive blower damage or sys-
tem damage.
FIGURE 12 - PRESSURE DROP ACROSS A DRY INDOOR COIL VS. SUPPLY AIR CFM
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
2000 2500 3000 3500 4000 4500
CFM
Pressure Drop
IWG
FF-07

035-18548-001-B-0203
Unitary Products Group 15
TABLE 6: SUPPLY AIR BLOWER PERFORMANCE12
ESP
7.5 Ton Heat Pump Blower Performance
CFM RPM Watts CFM RPM Watts CFM RPM Watts CFM RPM Watts CFM RPM Watts CFM RPM Watts
0.2 4152 895 1877 4014 892 1844 3725 819 1378 3443 774 1201 3219 734 1015 2949 691 855
0.4 3901 900 1752 3753 897 1714 3404 823 1255 3091 777 1084 2818 736 899 2503 694 744
0.6 3617 905 1607 3478 902 1569 3000 827 1118 2671 855 943 2149 740 762 - - -
0.8 3232 911 1443 3083 907 1406 2468 831 957 - - - - - - - - -
1 2740 916 1222 2431 913 1185 - - - - - - - - - - - -
0 turns 1 turn 2 turns 3 turns 4 turns 5 turns
1. Available static pressure in IWG to overcome the resistance of the duct system and any accessories added to the unit. Refer to Tables 6 & 7 for the
resistance of these accessories and for additional motor and drive data. NOTE: Refer to Form 515.41-AD1 for blower performance curves.
2. Motors can be selected to operate into the service factor because they are located in the moving air stream, upstream of any heating device.
FIGURE 13 - FF-07 AIRFLOW CHART
2400
2600
2800
3000
3200
3400
3600
3800
4000
4200
4400
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1
External Static
0 turns
1turn
2 turns
3 turns
4 turns
5 turns
7.5-ton Heat Pump
CFM

035-18548-001-B-0203
16 Unitary Products Group
(To Be Included With Duct System Static Resistance)
* These factory-mounted motors are wired for a 460V power supply. Refer to the wiring diagram inside the motor terminal box when reconnect-
ing the motor leads for a 208 or 230 volt power supply.
TABLE 7: ACCESSORY STATIC RESISTANCE (IWG)
Model Accessory Static Resistance, IWG
BLOWER CFM 2400 2700 3000 3300 3600
FF-07
Electric
Heat
10 KW .01 .01 .01 .02 .02
16 KW .01 .02 .02 .03 .04
26 KW .03 .04 .05 .06 .07
36 KW .05 .07 .08 .10 .11
Supply Air Plenum .03 .03 .04 .05 .06
Return Air Grille .02 .03 .04 .05 .06
TABLE 8: BLOWER MOTOR AND DRIVE DATA
Model Motor
HP*
Blower
RPM
Adjustable Motor Pulley Fixed Blower Pulley Belt
Pitch Dia.
(Inches)
Bore
(Inches)
Pitch Dia.
(Inches)
Bore
(Inches) Designation Pitch Lg.
(Inches)
FF-07 1-1/2 690 - 920 2.8 - 3.8 7/8 7.5 1 A36 37.3

035-18548-001-B-0203
Unitary Products Group 17
FIGURE 14 - UNIT DIMENSIONS & CLEARANCES
1-23/32 KNOCKOUT
(Removed only when
Electric Heat Accessory
is used)
52-1/4
15-3/8 18-7/8
3-5/8
1
7/8" HOLE W/BUSHING
FOR CONTROL
WIRING
(Back Panel)
1-3/8" KNOCKOUT
FOR POWER WIRING (Back Panel)
Do not remove this knockout when
the unit is equipped with an Electric
Heat Accessory. Refer to detail of
the Heater Accessory for power
wiring access opening
4-1/4 5/8
16-1/8
25-7/8
15
AIR
OUT
BLOWER MOTOR
AND DRIVE
ACCESS PANEL
(This side only)
51-1/8
HOLE WITH GROM-
MET FOR 1/2 O.D.
LIQUID LINE
HOLE WITH GROM-
MET FOR 1-1/8 O.D.
SUCTION LINE
4
2-5/8 1-3/8
1-3/4
1-1/8
25-1/8
2
7/8 O.D. DRAIN
CONN. (Must be
trapped)
48
2
1-5/8
23
AIR
IN
2-1/4
1
6-3/4
3-1/4
FILTER ACCESS PANEL
(When unit is installed in
a horizontal position,do
not block this area with
refrigerant piping)
8-3/8
Accessories
• ELECTRIC HEATER - Add 14-14-1/4” to unit height when used.
• SUPPLY AIR PLENUM - Add 27-1/2” to unit height when used.
• BASE - Add 20” to unit height when used.
Minimum Clearances
Side with RETURN AIR opening 24”
Side with SUPPLY AIR opening 24”1
Side with PIPING CONNECTIONS 52”2
Side opposite with PIPING CONNECTIONS 12”
Side with access for 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. Although no clearance is required for service and oper-
ation, some clearance may be required for routing the
power and control wiring.
4. Allow enough clearance to trap the condensate drain
line.
All dimensions are in inches. They are sub-
ject to change without notice. Certified dimen-
sions will be provided upon request.

035-18548-001-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 necessary to assure good system perfor-
mance. Use a brush, vacuum cleaner attachment or
other suitable means.
If the coil becomes extremely dirty, it may be neces-
sary to use an industrial grade detergent and a hose to
clean the finned surfaces. This is recommended to pre-
vent 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 14 for the location of
the filter access panel.
DRAIN PAN
The condensate drain pan should be inspected regu-
larly 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 when
signs of failure begin to appear.

035-18548-001-B-0203
Unitary Products Group 19

Subject to change without notice. Printed in U.S.A. 035-18548-001-B-0203
Copyright © by Unitary Products Group2003. All rights reserved. Supersedes: 035-18548-001-A-0802
Unitary 5005 Norman
Products York OK
Group Drive 73069