INSTALLATION
INSTRUCTION
SINGLE PACKAGE HEAT PUMPS
7-1/2 & 10 TON
Supersedes: 511.06-N2W (398)
511.06-N2Z (1298)
MODELS BCCB 090 & 120,
MODELS BECB090 & 120
(9 EER)
208/230/460 VOLT
MODELS ONLY
SAFETY CONSIDERATIONS
Due to system pressure, moving parts and electrical
components, installation and servicing of air conditioning
equipment can be hazardous. Only qualified, trained, service
personnel should install, repair, maintain or service this
equipment.
Observe all precautions in the literature, on labels and tags
accompanying the equipment whenever working on air
conditioning equipment. Be sure to follow all other safety
precautions that apply.
Wear safety g lasses and work gloves , and follow all safety
codes. Use a quenching cloth and have a fire extinguisher
available for all brazing operations.
GENERAL
Model BCB units are single package heat pumps designed for
outdoor installation on a rooftop or a slab. Supplemental
electric heaters ar e av ai la bl e as field-installed access ori es .
The units are completely assembled on rigid, permanently
attached base rails. All piping, refrigerant charge, and electrical
wiring is factory installed and tested. The units require only
electric power and duct connections at the point of installation.
The supplemental electric heaters have nickel-chrome
elements and utilize single point power connection.
035-16199
208/230/575 V OLT
MODELS ONLY
• 530.18-N3.8V - Motorized Outd oor Ai r Damp er Acc y.
• 530.18-N3.9V - Manual Outdoor Air D ampe r 0 -35 %
• 530.18-N3.10V - Manual Outdo or Air D ampe r 0 -10 0%
• 530.18-N3.5V - Fuse Block Access ory
Renewal Parts:
• Refer to the Renew al Parts Manual for complete listin g of
replacement parts on this equipment.
All forms referenced in this ins tru ct io n ma y be orde red from :
Publications Distribution Center
Unitary Products Group
P.O. Box 1592, York, Pa. 17405
APPROVALS
Design certified by U.L. as follows:
1. For use as a heat pump on ly unit or a heat pump unit with
supplemental electric heat.
2. For outdoor installation only.
3. For installation on combustible material.
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 t he carrier’s freigh t bill. A sep arate
request for inspection by the carrier’s agent should be made in
writing. Refer to Form 50.15-NM for additional information.
REFERENCE
Additional information on the design, installation, operation and
service of this equipment is available in the following reference
forms:
• 530.18-N9.1V - Electric Heater Acce ssory
• 530.18-N3.2V - Economizer Accessory
Installer should pay particular attention to the words:
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.
THIS PRODUCT MUST BE INST ALLED IN STRICT COMPLIANCE
WITH THE ENCLOSED INST ALLATION INSTRUCTIONS AND ANY
APPLICABLE LOCAL, STATE, AND NATIONAL CODES
INCLUDING, BUT NOT LIMITED TO, BUILDING, ELECTRICAL,
AND MECHANICAL CODES.
INCORRECT 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, SERVICE AGENCY OR THE GAS
SUPPLIER
NOTE, CAUTION
and
WARNING
CAUTION
WARNING
. Notes are intended to clari fy or
511.06-N2W
TABLE OF CONTENTS
General................................................................................1
Inspection.............................................................................1
Reference ............................................................................ 1
Approvals ............................................................................. 1
Nomenclature.......................................................................2
INSTALLATION
Limitations............................................................................ 3
Location ............................................................................... 3
Condensate Drainage Precaution ....................................... 3
Rigging and Handling .......................................................... 3
Clearances........................................................................... 3
Ductwork .............................................................................. 4
Filters ................................................................................... 4
Condensate Drain................................................................4
Service Access..................................................................... 4
Thermostat.................. ........ ........ ........ ........ ........ ........ ........ .4
Power and Control Wiring.................................................... 4
Electric Heaters....... .................. .. .. .. .................. .. .. .. .............4
Compressors......................... .. .. .. .................. .. .. .. .................4
OPERATION
Cooling System.................................................................. 10
Preliminary Operation Cooling........................................... 10
Cooling Sequence of Operation ........................................ 10
Heating Sequence of Operation........................................10
Heat Anticipator Setpoints ..................................................11
Checking Supply Air CFM............. .. .... .... .... .... .... .... .... .... ....11
Defrost Sequence of Operation ......................................... 12
Secure Owner’s Approval .................................................. 13
MAINTENANCE
Normal Maintenance..... .. .................. .. .. .. .................. .. .. .. ... 13
TABLES
No. Description Page
1 Unit Applicatio n Da ta............ .... .... .... .... .... .. 3
2 Electrical Data............................................. 5
3 Physical Data.............................................. 6
4 Point Loads........... .. .. .. .................. .. .. .. ........ 8
5 Supply Air Br Performance................... .... .. 9
6 Accessory Static Resistances .................... 9
7 Blower Motor and Drive Data ..................... 10
8 Heat Anticipator Setting.............................. 11
9 Blower Motor Pulley Adjustment................. 1 1
FIGURES
No. Description Page
1 Center of Gravity......................................... 3
2 Recommended Drain Piping....................... 4
3 Typical Field Wiring..................................... 5
4 Dimensions and Clearances...... .............. ... 7
5 Point Loads........... .. .. .. .................. .. .. .. ........ 8
6 Pressure Drop versus Supply Ai r CF M....... 11
7 Defrost Initia ti on Times....... .. .. .. .................. 12
8 Ambient Modified Time/Temp. Control........ 13
PRODUCT CATEGORY
B = Single Package Heat Pump
(Air Cooled)
PRODUCT GENERATION
C = 3rd Generation
D = 4th Generation
E = 5th Generation
PRODUCT IDENTIFIER
CB = Heat Pump
2 Unitary Products Group
PRODUCT NOMENCLATURE
B C C B A
90 0- T
FACTORY INSTALLED
A = No Heat Installed
NOMINAL COOLING CAPACITY
090 = 7-1/2 Ton
120 = 10 Ton
VOLTAGE CODE
-T = 208/230-3-60
-W = 460-3-60
-X = 575-3-60
HEAT
INSTALLATION
LIMITATIONS
These units must be in stal led in accord ance wit h t he fo llow ing
national and lo cal safety codes:
1. National Electrical Code ANSI/NFPA No. 70.
2. Local electr ic utility requirements.
3. Canadian Electrical Code C22.1
4. Canadian Installation Codes CAN1-B149.
Refer to Table 1 for Unit Applic ation Data.
If components are to be added to a unit to meet local codes,
they are to be installed at the dealer’s and/or the customer’s
expense.
Size of unit for proposed install ation should be based on h eat
loss/heat g ain calcul ation made according to the meth ods of
Air Conditioning Co nt rac to rs of Am eri ca (ACCA).
51 1.06-N2W
OUTDOOR COIL CONDENSATE DRAINAGE
PRECAUTION
Condensate will drain from the outdoor coil during the heating
and defrost cycles. Normally this condensate may be allowed
to drain directly onto the ground/roof. A gravel bed is
recommended to prevent mud splashing.
WARNING:The unit should no t be ins talled in an are a where
mud or ice could cause personal injury. Remember
that condensate will drip from the outdoor coil
during heat and defrost cyc les and that thi s condensate wi ll freeze when the tem perature of the
°
outdoor air is below 32
F.
RIGGING AND HANDLING
Exercise care when moving the unit. Do not remove any
packaging unti l the unit is ne ar the place of installat ion. Rig t he
unit by attaching chain or cable slings to the lifting holes
provided in the base rai ls. Spre aders, who se length ex ceeds
the largest di mension ac ross the uni t,
the top of the unit.
be used acros s
MUST
TABLE 1
Min. / Max.*
Utilization range “A” in accordance with ARI Standard 110.
*
- UNIT APPLICATION DATA
Model BCH090 BCH120
Voltage
Variation
Wet Bulb Temperature (°F)
of Air on Indoor Coil,
Min. / Max.
Dry Bulb Temperature (°F)
of Air on Outdoor Coil,
Min. / Max.
208 / 230V 187 / 253
460V 414 / 506
575V 518 / 630
57 / 72 57 / 72
45 / 120 45 / 120
LOCATION
Use the fol lowing guidelin es to select a sui table location f or
these units.
1. Unit is designed for outdoor installation on ly.
2. Outdoor coil must have an unlimited supply of ai r.
3. For ground level installation, use a level concrete slab with
a minimum t hickness of 4 inch es. The length and width
should be at least 6 inches greater than the unit base rails.
Do not tie slab to the building foundation.
4. Roof structur e must be able to supp ort the weight of t he unit
and its options and/or a ccesso ries. Uni t must be inst alled
on a solid level r oof curb or appropriate angle iron frame.
CAUTION: I f a unit is to be inst alled on a roof curb or
5. Maintain level tolerance to 1/2" maximum across the entire
length or width of the unit.
special fr ame ot her tha n a Y ORK ro of curb ,
gasketing must be applied to all surfaces that
come in contact with the unit underside.
BEFORE LIFTING A UNIT, MAKE SURE THAT ITS WEIGHT
IS DISTRIBUTED EQUALLY ON THE CABLES SO THAT IT
WILL LIFT EVENLY.
Units may also be moved or lifted with a forklift. Slotted
openings in the base rails are provided for this purpose.
LENGTH OF FORKS MUST BE A MINIMUM OF 54".
Remove the nesting brackets from the four corners on top of
the unit. All screws that are removed when taking these
brackets off must be repl ac ed on th e un it .
Refer to T a ble 3 for unit weigh ts and to Figure 1 f or approximate
center of gravity.
DIM. 7-1/2 Ton 10 T on
A 32" 32-1/2"
B 44-3/4" 44"
FIG. 1
- CENTER OF GRAVITY
CLEARANCES
All units req uire certain cle arances for prope r operation and
service. Refer to Figure 4 for the clearances required for
combustible construct ion, servic ing, and proper unit ope ration.
WARNING:Do not permit overhanging structures or shrubs to
obstruct outdoo r air disc ha rge outlet.
Unitary Products Group 3
511.06-N2W
DUCTWORK
Ductwork should be designed and sized according to the
methods in Manu al Q of the Air Conditi oning Contractors of
America (ACCA).
A closed return duct system shall be used. This shall not
preclude u se of ec onom izers or out door fr esh air intak e. The
supply and return air duct connections at the unit should be
made with flexible joints to minimize noise.
The supply and retu rn air duct syste ms should be design ed for
the CFM and static requirements of the job. They should NOT
be sized to matc h the dime nsions of the duct connect ions on
the unit.
CAUTION: When fastenin g ductwork to si de duct flanges on
unit, insert screws through duct flanges only. DO
NOT insert screw s thr o ug h casing.
Outdoor ductwork must be insulated and wat erproofed.
Refer to Figur e 4 for inform ation conc erning side and bottom
supply and return air duct openings.
FILTERS
2" filters are supplied with each unit. 1" replacement filters may
be used with no modification to the filter racks. Fi lters must
always be in stal le d a he ad of th e i nd oo r coil and mus t be kep t
clean or replaced with same size and type. Dirty filters will
reduce the capacity of the unit and will result in frosted coils or
safety shutdown. Minimum filter area and required sizes are
shown in Table 3.
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compound on male pipe threads. Install a condensate drain line
from the 3/4" female co nnection on the unit t o spill into an open
drain.
NOTE: The condensate drain line MUST be trapped to provide
proper drainage. See Figure 2.
THERMOSTAT
The room thermostat should be located on an inside wall
approximat ely 56" ab ove the fl oor where it will no t be subjec t
to drafts, sun exposure or heat from electrical fixtures or
appliances. F ollow manufa cturer ’s instructions enclosed wit h
thermostat for general installation procedure. Color coded
insulated wires (#18 AWG) should be used to connect
thermostat to unit. Eight conductors are required.
The subbase on the low voltage thermostat includes an
“Emergency Heat” position on the system switch and a pilot
light. In the “Emergency Heat” position, the thermostat will
provide electric resistance heat only. The compressors will not
run. The p ilot lig ht wi ll i ndic ate that t he s witch is on “ EM H T”.
Nine conductors are requ ire d fo r thi s ap pl ic at ion.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of the
National E lectrica l Code, AN SI / NFPA (lates t edition ) and/or
local ordinances. The unit must be electrically grounded in
accordance with N.E.C . ANSI / NF PA (latest edit ion) or lo cal
codes. Voltage tolera nces which must be main tained at the
compressor t erminals during star ting and running conditi ons
are indicate d on the unit Rating Plate and Table 1.
The internal wiring harness furnished with this unit is an integral
part of a UL and C.G .A. desi gn certif ied unit . Field al teratio n to
comply with electrical codes should not be required.
A disconnect switch shou ld b e fi eld p rovid ed fo r th e unit. The
switch must be separate from all other circuits. Refer to Figure
4 for inst alla tion loc atio ns. I f any of th e wir e sup plie d wi th th e
unit must be replaced, replacement wire must be of the type
shown on the wiring diagram.
Electrica l line must be sized pro perly to carr y the load. USE
COPPER CONDUCTORS ONL Y. Each unit must be wired wi th
a separate branch ci rcuit fe d direct ly from t he mete r panel a nd
properly fused.
CAUTION: When connecting electrical power and control wir-
ing to the un it, w ate rpro of ty pe co nnec tor s MU ST
BE USED so that water or moisture cannot be
drawn into the unit during normal operati on. The
above waterproofing conditions will also apply
when installing a field-supplied disconnect switch.
FIG. 2 -
RECOMMENDED DRAIN PIPING
SERVICE ACCESS
Access to all serviceable components is provided by five
removable panels:
• Compressor co mp ar t ment
• Heater compartment
• Blower compartment
• Main control box
• Filter compart me n t
Refer to Figu re 4 for location of these access panels.
4 Unitary Products Group
Refer to Figure 3 for typical field wiring and to the appropriate
unit wiring diagram for control circuit and power wiring
information. Refer to Table 2 for electrical data.
ELECTRIC HEATERS
Supplemental electric hea ters are availa ble as field-in stalled
accessories. Refer to Form 530.18-N9.1V for accessory
instruction. These UL and C.G.A. approved heaters are located
within the c entral compartment of the unit (see Fig ure 4 for
access panel) with the heating elements extending into the
supply air chamber. All accessory heater kits contain a single
point power kit.
Fuses are su pplied, where required, wi th the accessor y kits.
Some KW sizes require fuses and others do not. Refer to the
accessory instruction for electrical data.
COMPRESSORS
The compressors are mounted on springs which have been
tightened down for shipment only. After the unit is installed,
back out th e compr essor b olts unti l the sleeve clears t he top
grommet.
51 1.06-N2W
TABLE 2
MODEL
NOTES: 1. Dual eleme nt , tim e de lay typ e.
2. Maximum HACR breaker of the same AMP size is applicable,
*Dual numbers indicate amps for compre ssor #1 / #2 resp ect ively.
- ELECTRICAL DATA
POWER
SUPPLY
208/230-3-60
090
120
460-3-60
575-3-60
208/230-3-60
460-3-60
575-3-60
COMPRESSOR
(#1 and #2)*
RLA
EACH
14.1
LRA
EACH
130
7.1
5.8
16.7/17.3
150
9.6
8.3
64
52
73
62
OUTDOOR
FAN
MOTOR,
(#1 & #2)
FLA
EACH
2.3
1.3
1.3
3.5
2.5
2.5
SUPPL Y
AIR
BLOWER
MOTOR,
FLA
TOTAL
UNIT
AMPACITY,
AMPS
MAX.
FUSE
SIZE,
AMPS
1,2
1.5HP 2HP 3HP 1.5HP 2HP 3HP 1.5HP 2HP 3HP
5.7
2.6
2.1
42.0
7.5
3.4
2.7
-
-
-
7.5
3.4
2.7
-
-
-
10.6
4.8
3.9
21.1
17.7
43.8
21.9
18.3
52.8
-
30.0
-
26.5
-
-
-
-
55.9
31.4
27.7
50
25
20
-
-
-
50
25
20
70
35
30
-
-
-
70
40
35
FIG. 3
- TYPICAL FIELD WIRING
Unitary Products Group 5
511.06-N2W
TABLE 3
- PHYSICAL DATA
MODEL
SUPPLY AIR
BLOWER
INDOOR
COIL
OUTDOOR
FANS
(Two Per Unit)
OUTDOOR
COIL
AIR
FILTERS
(SEE NOTE)
CHARGE
NOTE: Filter racks are adapte d fo r 1" or 2" thick filt er s.
CENTRIFUGAL BLOWER (Dia. x Wd. in.) 12 x 12 15 x 12
FAN MOTOR HP (STANDARD) 1-1/2 2
FAN MOTO R HP (ALTERNATE) 2 3
ROWS DEEP 3 3
FINS PER INCH 15 13
FACE ARE A (Sq. Ft.) 7.8 13.4
PROPELLER DIA. (in.) 24 ea. 24 ea.
FAN MOT O R HP 1/2 ea. 3/4 ea.
NOM. CFM TOTAL 2900 ea. 4400 ea.
ROWS DEEP 2 2
FINS PER INCH 13 15
FACE ARE A (Sq. Ft.) 20.0 29.3
QUANTITY PER UNIT (12" X 24" X 2") 2 QUANTITY PER UNIT (16" X 24" X 2") 2 3
QUANTITY PER UNIT (18" X 24" X 2") - 2
TOT AL FACE AREA (sq. ft.) 9.3 14.0
REFRIGERANT 22
(lbs./oz.)
BASIC UNIT
Electric Heat
(Nominal KW)
Economizer 77
Motorized
Outdoor Air
Damper
Roof Mounting Curb 155
BCB
090 120
SYSTEM NO. 1 9/0 11/8
SYSTEM NO. 2 9/0 13/8
WEIGHTS (LBS)
7-1/2 Ton 1050
10 Ton 1400
ACCESSORIES
9 KW 19
18 KW 24
24 KW 27
36 KW 30
54 KW 37
97
6 Unitary Products Group
51 1.06-N2W
RETURN AIR
SUPPL Y AIR
OUTDOOR AIR
OUTDOOR AIR
(Economizer)
All dimensions are in inches. They are subject to change without notice. Certified dimensions will be provided upon request.
UTILITIES ENTRY DATA
HOLE
Knockouts in the bottom of the unit can be located by the slice in the
*
insulation.
KNOCKOUT
SIZE
(DIA.)
A
3/4"
7/8" Bottom*
B2"
Control
Wiring
Power Wiring
(Side or Bottom)*
USED FOR
Side
DUCT COVERS - Units are shipped with all air duct
openings covered.
For
side duct applications;
1. Remove and discard the supply and return air duct
covers.
2. Connect ductwork to duct flanges on the rear of the
unit.
For
bottom duct applications;
1. Remove the side supply and return air duct covers to
gain access to the bottom supply and return air duct
covers.
2. Remove and discard the bottom duct covers.
3. Replace the side duct covers.
E C O N O M IZ E R R A IN H O O D
27"
3-3/4"
DIM
"A "
28
ECONOMIZER
31
MO TO RIZED DAMPER
31
M ANUAL DAMPER 0-100%
24
M ANUAL DAMPER 0-35%
Front 24"
Back
Left Side (Filter Access)
Right Side (Cond. Coil) 24"
Below Unit
Above Unit
NOTE:
Units and ductwork are approved for zero clearance to combustible materials when
equipped with electric he at er s.
1
Units may be installed on combustible flo ors made fr om wood or class A, B or C
roof covering material.
2
Units must be installed oudo or s. Ove rhan gin g str uct ur es or shru bs sho uld not
obstruct outdoor air disch ar ge out let .
3/4" CONDENSATE
DRAIN
(M UST BE TRAPPED)
A
MINIMUM CLEARANCES
12" (Less Economizer)
36" (With Economizer
Outdoor Air Damper)
24" (Less Economizer)
54" (With Economizer)
1
2
20"
72" with 36" maximum
Horizontal Overhang
(For Outdoor Air Discharge)
(B) POW ER W IRING
E N T R Y
71"
L.H. END VIEW
29-5/8"
7"
3-1/2"
4-1/2"
FIG. 4
- DIMENSIONS & CLEARANCES (7-1/2 & 10 TON)
Unitary Products Group 7
511.06-N2W
B
C
A
FIG. 5
TABLE 4
D
4 POINT LOADS
- FOUR AND SIX POINT LOADS
- FOUR AND SIX POINT LOADS (LBS)
UNIT
BCB
090 1,154 231 281 353 289
120 1,504 301 355 460 388
TOTAL A B C D
FRONT
NOTE: These weights are with economizer and 36 kW electric heat.
UNIT
BCB
090 1,154 154 188 211 235 193 173
120 1,504 200 237 272 307 259 229
TOTAL A B C D E F
6 - POINT LOADS (LBS)
A
4 - POINT LOADS (LBS)
F
B
6 POINT LOADS
E
D
C
FRONT
NOTE: These weights are with economizer and 24 kW electric heat.
CENTER OF GRAVITY
8 Unitary Products Group
51 1.06-N2W
TABLE 5
MODEL BCB090
BLOWER
SPEED,
MODEL BCB090
BLOWER
SPEED,
MODEL BCB120
BLOWER
SPEED,
- SUPPL Y AIR BLOWER PERFORMANCE
(7-1/2 & 10 TON)
- (SIDE DUCT APPLICATIONS)
CFM
RPM
975 0.93 1.16 1.08 0.79 1.27 1.18 0.53 1.45 1.35 0.29 1.65 1.54 - - 1025 1.08 1.21 1.13 0.95 1.34 1.25 0.68 1.54 1.44 0.42 1.75 1.63 0.17 1.97 1.84
1070 1.22 1.32 1.23 1.08 1.46 1.36 0.83 1.68 1.57 0.58 1.89 1.76 0.32 2.11 1.97
1130 1.41 1.43 1.33 1.29 1.57 1.46 1.02 1.83 1.71 0.77 2.04 1.90 - - 1175 1.61 1.51 1.41 1.49 1.67 1.56 1.23 1.92 1.79 0.96 2.18 2.03 - - 1220 1.78 1.66 1.55 1.66 1.81 1.69 1.39 2.10 1.96 ------
ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW
2250 2550 3000 3400 3750
- (BOTTOM DUCT APPLICATIONS)
CFM
RPM
975 0.86 1.16 1.08 0.70 1.27 1.18 0.40 1.45 1.35 0.12 1.65 1.54 - - 1025 1.01 1.21 1.13 0.86 1.34 1.25 0.55 1.54 1.44 0.25 1.75 1.63 - - 1070 1.15 1.32 1.23 0.99 1.46 1.36 0.70 1.68 1.57 0.41 1.89 1.76 0.12 2.11 1.97
1 130 1.34 1.43 1.33 1.20 1.57 1.46 0.89 1.83 1.71 0.60 2.04 1.90 - - 1 175 1.54 1.51 1.41 1.40 1.67 1.56 1.10 1.92 1.79 0.79 2.18 2.03 - - 1220 1.71 1.66 1.55 1.57 1.81 1.69 1.26 2.10 1.96 - - - - - -
2250 2550 3000 3400 3750
ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW
- (SIDE DUCT APPLICATIONS)
CFM
RPM
860 1.14 1.40 1.31 0.98 1.58 1.48 0.77 1.80 1.68 0.53 2.05 1.91 0.25 2.31 2.15
915 1.32 1.55 1.45 1.18 1.76 1.64 0.95 1.98 1.85 0.72 2.23 2.08 0.49 2.48 2.31
950 1.51 1.68 1.57 1.37 1.91 1.78 1.15 2.14 2.00 0.91 2.43 2.27 0.67 2.72 2.54
1000 1.69 1.83 1.71 1.57 2.07 1.93 1.35 2.33 2.17 1.14 2.62 2.45 0.92 2.91 2.72
1050 1.89 1.98 1.84 1.78 2.25 2.10 1.57 2.55 2.37 1.35 2.86 2.67 1.12 3.17 2.96
1090 2.08 2.12 1.97 1.97 2.41 2.24 1.78 2.72 2.54 1.55 3.06 2.86 - - -
ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW
3000 3500 4000 4500 5000
MODEL BCB120
BLOWER
SPEED,
RPM
860 1.01 1.40 1.31 0.80 1.58 1.48 0.54 1.80 1.68 0.23 2.05 1.9114 - - -
915 1.19 1.55 1.45 1.00 1.76 1.64 0.72 1.98 1.85 0.42 2.23 2.08 0.13 2.48 2.31
950 1.38 1.68 1.57 1.19 1.91 1.78 0.92 2.14 2.00 0.61 2.43 2.27 0.31 2.72 2.54
1000 1.56 1.83 1.71 1.39 2.07 1.93 1.12 2.33 2.17 0.84 2.62 2.45 0.56 2.91 2.72
1050 1.76 1.98 1.84 1.60 2.25 2.10 1.34 2.55 2.37 1.05 2.86 2.67 0.76 3.17 2.96
1090 1.95 2.12 1.97 1.79 2.41 2.24 1.55 2.72 2.54 1.25 3.06 2.86 - - -
NOTE: Blower performance includes a wet indoor coil and 2" filters.
ESP = External Static Pressure available for the supply and return air duct system. All internal unit resistances have been deducted from the
total static pressure of the blower. Refer to the Accssory Static ResistancesTable for the resistance of the unit accessories.
TABLE 6
Electric Heaters
- ACCESSORY ST ATIC RESISTANCES*
DESCRIPTION
Economizer 0.02 0.02 0.03 0.05
- (BOTTOM DUCT APPLICATIONS)
CFM
3000 3500 4000 4500 5000
ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW
= Larger Horsepower Alternate Motor Required.
EXTERNAL STATIC PRESSURE DROP - RESISTANCE, IWG
CFM
2250 3000 4000 5000
1
99 KW
18 KW
24 KW 0.06 0.12 0.21 0.33
36 KW 0.07 0.13 0.23 0.35
2
54 KW
0.06 0.11 0.20 0.31
- 0.15 0.26 0.40
*Deduct these resistance values from
the available external static pressure
shown in the respective Supply Air
Blower Performance Table.
1
9 KW Heater is only available on
7-1/2 Ton Units.
2
54 KW Heater is only available on
10 Ton Units.
Unitary Products Group 9
511.06-N2W
TABLE 7
BASIC
BCB090 975-1220
BCB120 860-1090
* All motors are 1750 RPM, have solid bases and are inherently protected. These motors can be selected to operate into their service factor because they are located in th e moving air,
upstream of any heating device.
- BLOWER MOTOR AND DRIVE DAT A
MOTOR*
1.20 56 82.0 3.4 - 4.4 7/8 6.2 1 50.3 A49 1
1.20 56 82.0 3.4 - 4.4 7/8 7.0 1 57.3 A56 1
UNIT
BLOWER
RANGE
(RPM)
HP
1-1/2
2
2
3
SERVICE
FACTOR
FRAME
SIZE
EFFICIENCY
(%)
ADJUSTABLE
MOTOR PULLEY
PITCH
DIA.
(IN.)
BORE
(IN.)
FIXED
BLOWER PULLEY
PITCH
DIA.
(IN.)
BORE
(IN.)
PITCH
LENGTH
(IN.)
BEL TS
DESIG-
NATION
OPERATION
COOLING SYSTEM
The unit has an air-co oled conden ser and i s factory-c harged
with Refrigerant-22.
The compressors are hermetically sealed, internally sprung
and mounted to the base with rubber in sulated hold-dow n bolts.
The compre ssors also have inh erent (internal) prot ection. If
there is an abnormal temperature rise in a compressor, the
protector will open to shut down the compressor.
PRELIMINARY OPERATION COOLING
After installation has been completed, energize the crankcase
heaters for at le as t fou r ho urs be fo r e o per at in g u nit. A fter t hi s
initial warm-up, the compressors should be given three false
starts (ener g iz ed ju st lo ng en ou gh to ma ke a f ew re vo lu ti on s)
with 5-7 minutes delay between each start before being put into
full time service.
NOTE: Prior to each coolin g season, the cran kcase heaters
must be energized at least 10 hours before system is
put into operation.
After the t hermostat is satisfied and opens, all components
likewise stop simultaneously .
The reversing valve is energi zed thru th e “Y1” circuit when the
subbase is in the co ol ing mode.
The suction line freezestat will cut the compressors out when
the suction line temperature drops below 26°F. T his is an
automatic reset device.
HEATING SEQUENCE OF OPERATION
The following sequence of operation is based on using a
standard YORK heat pump two-stage heating/two-stage
cooling thermostat/subbase. Economizer (if supplied)
operation is not allowed in the heating mode - howeve r the
minimum position does operate.
FIRST STAGE HEAT
When the thermostat calls for “heating”, the low voltage control
circuit from “R” to “G” and “W1" (wiring sche matic) is completed
to energize the compressors, outdoor fan motors and blower
motor (if subbase i s set on auto) simu ltaneously . If the subba se
has the indoor fan set on ”on" t he mo tor wil l run a ll of the t ime.
QTY
COOLING SEQUENCE OF OPERATION
When the thermostat calls for “first-stage” cooling, the low
voltage control circuit from “R” to “G” and “Y1" (wiring
schematic) is com pleted to energiz e compressor #1 an d blower
motor simultaneously.
When the thermostat calls for “2nd-stage” cooling, the low
voltage control circuit from “R” to “Y2" is completed t o energize
compressor #2 and co nd en se r fan motor #2.
10 Unitary Products Group
SECOND STAGE HEAT
If the compressors alone can not satisfy the heating
requirement s, second stage hea t will ener gize all th e electri c
heat (if supplied) thru the “W2" circuit.
NOTE: On 10 ton units with 54KW heaters, only 36KW of
electric heat can be simultaneously energized with
mechanical heat in g. The full 54KW operates in eme rgency heat mode on ly.
HEA T ANT ICIPATOR SETPOINT S
It is important th at the anticipator setpoi nt b e correct. Too high
of a setting will result in longer heat cycles and a greater
temperature swing in the conditioned space. Reducing the
value below the co rrec t setpoi nt wi ll give shorter “ON” c ycles
and may result in the lowering of the temperature within the
conditioned space. Refer to Table 8 for the required heat
anticipator setting.
TABLE 8
- HEA T ANTICIPA T OR SETT ING
HEATER
KW
9
18
24
36
54
9
18
24
36
54
9
18
24
36
54
VOLTAGE
208/230-3-60
460-3-60
575-3-60
SETTING, AMPS
TH1
(Compr.)
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
1.10
TH2
(Suppl. Ht.)
0.40
0.90
0.90
0.90
0.90
0.40
0.80
0.80
0.80
0.45
0.40
0.80
0.80
0.80
0.45
51 1.06-N2W
NOTE: The tubes must be inserted and held in a position
perpendicu lar to the a ir flo w so th at vel ocity pressure will not affect the static pressure readings.
3. Using an inclin ed manomete r, determine the pressure d rop
across a d ry indoor coil. S ince the m oisture on an indoor
coil may vary greatly, measuring the pressure drop across
a wet coil u nder field co nditions would be inaccurate. To
assure a dr y coil, the co mpres sors sh ould be deac tiva ted
while the test is being run.
4. Knowing the pressure drop acr oss a dry coil, the actual
CFM through the unit can be determined from the curve in
Figure 10.
WARNING:Failure to properly adjust the total system air quan-
tity can result in extensive blower damage.
After readings ha ve been ob tained, re move the t ubes and seal
up the dri lled holes in th e side panels. 5/16" dot plugs (P/N
029-13880) are available through normal parts ordering
procedures.
CHECKING SUPPLY AIR CFM
The RPM of the supply air blower will depend on the required
CFM, the unit acc essories and th e static resistance s of both
the supply and the return air duct systems. With this
information, the RPM for the supply air blower can be
determined from the blower performance data in Table 4.
Knowing the r equired b lower RPM and the bl ower moto r HP,
the setting (t ur ns op en ) f or t he su pply air motor pu ll ey ca n b e
determined from Table 9.
TABLE 9 -
SUPPLY AIR B LOW ER MOTOR PULLEY
ADJUSTMENT
TURNS
OPEN*
5 975 860
4 1024 906
3 1073 952
2 1122 998
1 1171 1044
0 1220 1090
BELT DRIVE BLOWER
All units have belt drive single-speed blower motors. The
variable pi tch pulley on t he blower moto r can be adjusted to
obtain the desired supply air CFM. Refer to Table 6 for blower
motor and drive data.
Start the supply air blower motor. Adjust the resistances in both
the supply and the return ai r duct sy stems to bal ance the a ir
distribution throughout the conditioned space. The job
specifications may require that this balancing be done by
someone other tha n th e equipment installer.
T o che ck the supply air C FM after the initial bala ncing has be en
completed:
BLOWER DRIVE RANGE (RPM)
BCB090 BCB120
FIG. 6 -
PRESSURE DROP ACROSS A DRY INDOOR
COIL VS SU P PLY AIR CFM
1. Remove two dot plugs from t he filter access and the blower
access pane ls as shown in Figure 4.
2. Insert at least 8" of 1/4 inch tubing into each of these holes
for sufficient penetra tion into the air f low on both sides of
the indoor coil.
Unitary Products Group 11
511.06-N2W
DEFROST SEQUENCE OF OPERATION
LOCKOUT CONTROL
These heat pumps have a unique “ambient modified”
time-temperature defrost co ntrol that automati cally adjusts to
changes in the outdoor temperature. The defrost control will
shorten the defrost initiation time periods above 35°F and will
extend the defrost initiation time periods below 35°F. The
control is factory set to defrost at 110 minutes (T3), but it can
be field adjusted to defrost at 80 minutes (T2) or 50 minutes
(T1) in areas with high humidity.
The curve in Figure 7 shows how defrost initiation times are
automatically compensated for changes in outdoor temperature.
EXAMPLE: If the timer is factory set on p in T -3 (110 minutes
35°F outdoor) an d t he outd oo r te mper a tu re c li mb s t o 45°, the
time initiation cycle will decrease to every 100 minutes.
If the outdoor temperature drops to 10°F where ice is less li kely
to form, the 110 minute interval will extend to every 150
minutes.
Two requirements must be met before a defrost cycle can be
initiated.
1. The defrost tim e cy cl e mu st be complete.
2.
The liquid li ne temperature must be less than 28°F.
Defrost will terminate when the liquid line sensor reaches
or after 10 minutes. If both or just one circuit defrosts, electric
heat is energized.
The defrost ti me cy cl e w i ll r es ta rt 1 0 m in ut es af te r th e st art of
the defrost cycle even though the liquid sensor terminated
defrost after 3 minu te s.
During trou bleshooting, the defrost tim e can be reduced to 20
seconds by shorting out the SW1 test pins on the module. The
pins are 1/2" long, 3/16" apart and are mounted on a white
base. See Figure 10.
55°F
Any one of four conditions will put the system into a lock-out
condition durin g th e he ating or cooling mode:
1.
The discharge line temperature reaches 255°F (215°F
reset) or,
2. The discharge pressure reaches 398 PSIG (310 PSIG
reset) or,
3.
The suction line freezestat equals 26°F (38°F reset) or,
4. The low-pressure cut-out equals 7 PSIG (22 PSIG reset).
A lock-out will energize the emergency heat light on the
at
thermostat and the red LED light on the unit relay board.
Turning the therm ostat switch to “Off” then back to “On ”, will
reset the syst em.
NOTICE TO OWNER:
If a lockou t occurs, check f or the following prob lems before
calling a serviceman:
1. Dirty filters.
2. Snow accumulation.
3. Leaf or debris bloc ka ge .
After eliminating the problem, attempt to restart the system as
follows:
•
turn the system switch on the thermostat to its “OFF” position
for 10 seconds.
•
turn it back to its original position.
If the unit doesn’t start, call a serviceman.
NOTE: Models with an anti-recycle accessory will have a
5-minute delay be fo re st arting.
FIG. 7 -
12 Unitary Products Group
DEFROST INITIATION TIMES
T2 - 80 MINUTE SETTING
T3 - 110 MINUTE SETTING
(Factory Set Point)
SHORTING PEGS TO
OVERRIDE TIMER
FOR SERVICE
MOVABLE JUMPER
WIRE TO CHANGE
DEFROST TIMER
FIG. 8
- AMBIENT MODIFIED TIME/TEMPERATURE CONTROL
51 1.06-N2W
T1 - 50 MINUTE SETTING
SECURE OWNER’S APPROVAL
:
When the system is fu nc ti on in g properly , secure the owner’s approval. Show hi m
the location of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperature settings within the limitations of the system.
MAINTENANCE
NORMAL MAINTENANCE
CAUTION: Prior to any of the following maintenance proce-
dures, shut off all power to the unit to prevent
personal injury.
FILTERS - Inspect once a month. Repl ac e di sp os ab le or clean
permanent type as necessary. DO NOT replace permanent type
with disposab le .
MOTORS - Indoor fan and outdoor fan motors are permanently
lubricated and require no maintenance.
OUTDOOR COIL - Dirt should not be allowed to accumulate on
the outdoor coil s urface or ot her parts in th e air circuit. Cleani ng
should be as oft en as necessary to keep coil clean. Use a b rush,
vacuum cleaner attachment, or other suitable means. If water
is used to clea n co il, be s ure po wer t o the un it is shut off prior
to cleaning.
NOTE: Exercise care when clea ning the coil so that the coi l fins
are not damage d.
Do not permit the outdoor air discha rge to be obstru cted
by overhanging structures of shrubs.
Unitary Products Group 13
511.06-N2W
14 Unitary Products Group
511.06-N2W
Unitary Products Group 15
Supersedes: 511.06 (398)
Subject to change without notice. Printed in U.S.A.
Copyright by Unitary Products Gro up 19 98 . All r i gh ts rese rve d.
Unitary
Products
Group
5005
York
Drive
Norman
Oklahoma
73069
Code: SBL, F
511. 06-N2Z
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