Unitary products group BAUZ Series User manual

GENERAL
ModelBUZunitsarefactoryassembledheatpumpsdesignedfor
outdoor installation on a roof top or a slab. Field-installed electric
heateraccessories are availableto provide supplementalelectric
heat combined with electric cooling and heating.
The units are completely assembled on rigid, removable base
rails. All piping, refrigerant charge, and electrical wiring is fac-
tory installed and tested. The units require only electric power
and duct connections at the point of installation.
The electric heaters have nickel-chrome resistance wire ele-
ments and utilize single point power connection.
INSPECTION
Assoonasaunitisreceived,itshouldbeinspectedforpossible
damage during transit. If damage is evident, the extent of the
damage should be noted on the carrier's freight bill.
Aseparaterequest for inspection bythecarrier'sagent should
bemadeinwriting.RefertoForm50.15-NMforadditionalinfor-
mation.
REFERENCE
Additional information on the design, installation, operation
andservice of this equipmentisavailableinthefollowing refer-
ence forms:
•55.70-N1 — General Installation
•55.70-N2 — Pre-start & Post-start Check List
•035-16605-003 — Electric Heater Accessory
REPLACEMENT PARTS
•Refer to User’s Maintenance and Service Information
Manual for complete listing of replacement parts on this
equipment.
CAUTION
THISPRODUCTMUSTBEINSTALLEDINSTRICTCOMPLIANCE WITHTHEENCLOSEDINSTALLATION INSTRUCTIONS
AND ANY APPLICABLE LOCAL, STATE, AND NATIONAL CODES INCLUDING, BUT NOT LIMITED TO, BUILDING, ELEC-
TRICAL, AND MECHANICAL CODES WARNING
INCORRECT INSTALLATION MAY CREATE ACONDITION WHERE THE OPERATION OF THE PRODUCTCOULD CAUSE
PERSONAL INJURY, PROPERTY DAMAGE AND/OR DEATH.
WARNING
DE-ENERGIZE THE ELECTRICAL POWER TO THE UNIT BEFORE ATTEMPTING TO INSPECT, REPAIR OR PERFORM
MAINTENANCE TO THE UNIT.
SINGLE PACKAGE HEAT PUMPS
Supersedes: Nothing 035-20188-000-A-0704
MODELS BAUZ024 THRU 060
2 THRU 5 TON
WITH R-410A REFRIGERANT
(13 SEER)
Installershouldpayparticularattentiontothewords: NOTE,CAUTIONandWARNING.Notesareintendedtoclarifyormakethe
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.
CAUTION
THIS SYSTEM USES R-410AREFRIGERANT WHICH OPERATES AT HIGHER PRESSURES THAN R-22. NO OTHER RE-
FRIGERANT MAY BE USED IN THIS SYSTEM.
INSTALLATION MANUAL

LIMITATIONS
These units must be installed in accordance with the following
national and local safety codes.
1. National Electrical Code ANSI/NFPS No. 70 or Canadian
Electrical Code Part 1, C22.1 (latest editions).
2. Local plumbing and waste water codes and other applica-
ble local codes.
Referto Table1forunitapplicationdataand to Table5forelec-
tric heat application data.
If components are to be added to a unit to meet local codes, they
aretobeinstalledatthedealer'sand/orthecustomer'sexpense.
Size of unit for proposed installation should be based on heat
loss/heat gain calculations made in accordance with industry
recognized procedures identified by the Air Conditioning Con-
tractors of America.
LOCATION
Use the following guidelines to select a suitable location for
these units.
1. Unit is designed for outdoor installation only.
2. Condenser must have an unlimited supply of air. Where a
choiceoflocationispossible,positionunitoneithernorthor
east side of building.
3. For ground level installation, a level pad or slab should be
used.Thethicknessandsizeofthepadorslabusedshould
meet local codes and unit weight. Do not tie the slab to the
building foundation.
4. For roof top installation, be sure the structure can support
the weight of the unit plus any field installed components.
Unitmustbeinstalledonalevelroofcurborappropriatean-
gle iron frame providing adequate support under the com-
pressor/condenser section.
5. Maintain level tolerance of unit to 1/8" maximum.
RIGGING OR HANDLING
Care must be exercised when moving the unit. Do not remove
anypackaging untiltheunitis near theplaceofinstallation. Rig
unit with slings placed under the unit. Spreader bars of suffi-
cient length should be used across the top of the unit.
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 fork-lift. Slotted open-
ings in the skid are provided for this purpose. Forks must pass
completely through the base.
RefertoTable2forunitweightsandtoFigure1forapproximate
center of gravity.
035-20188-000-A-0704
2 Unitary Products Group
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INSTALLATION
Voltage Variation
Min. / Max.1 208/230V3187 / 2533
460V 414 / 504
Wet Bulb Temperature (°F) of Air on
Evaporator Coil, Min. / Max. 57 / 72
Dry Bulb Temperature (°F) of Air on
Condenser Coil, Min.2/ Max. 45 / 120
1Rated in accordance with ARI Standard 110, utilization range “A”.
2A low ambient accessory is available for operation down to 0°F
3“T1" transformer primary tap must be moved from the 230 volt connection to the 208 volt
connection for low voltage applications of 208 volt and below.
TABLE 1 - UNIT APPLICATION DATA
FIG. 1 - CENTER OF GRAVITY
49-1/8 26 23-1/2 47-3/4
CENTER OF GRAVITY
FRONT
OF
UNIT
“A”
“B”
“C”
“D”
UNIT
SIZE SHIPPING
WEIGHT
(lbs.)
OPERAT-
ING
WEIGHT
(lbs.)
CORNER WEIGHTS
(location, lbs.)
“A” “B” “C” “D”
024 356 351 97 93 81 84
030 353 348 96 93 81 84
036 388 383 106 102 89 92
042 440 435 120 115 101 104
048 485 480 132 127 111 115
060 495 490 135 130 113 117
TABLE 2 - UNITS WEIGHTS

CLEARANCES
All units require certain clearances for proper operation and
service. Refer to Figures3&4fortheclearances required for
construction, servicing and proper unit operation.
WARNING:Do not permit overhanging structures or shrubs to
obstruct the condenser air discharge outlet.
DUCT WORK
Theseunitsareadaptabletodownflowuseas well as rearsup-
ply and return air duct openings. To convert to downflow, use
the following steps:
1. Remove the duct covers found in the bottom return and
supply air duct openings. There are four (4) screws secur-
ing each duct cover (save these screws to use later).
2. Installtheductcovers,removedinstepone,totherearsup-
ply and return air duct openings. Secure with the four (4)
screws used in step one.
3. Seal duct covers with silicone caulk.
Downflow units must have an “L”-shaped supply duct without
any outlets or registers located below the outlet of the unit.
Duct work should be designed and sized according to the
methods of the Air Conditioning Contractors of America
(ACCA), as set forth in their Manual D.
A closed return duct system shall be used. This shall not pre-
clude use of economizers or ventilation air intake. Flexible
joints may be used in the supply and return duct work to mini-
mize the transmission of noise.
CAUTION: When fastening duct work to the side duct flanges on
theunit,insertthescrewsthroughtheductflangesonly.
DONOTinsertthescrewsthroughthecasing.Outdoor
duct work must be insulated and waterproofed.
NOTE: Be sure to note supply and return openings.
Refer to Figure 4 for information concerning rear and bottom
supply and return air duct openings.
FILTERS
Singlephase unitsare shippedwithoutafilter andistheresponsi-
bility of the installer to secure a filter in the return air ductwork
or install a Filter/Frame Kit (1FF0114).
A filter rack and a high velocity filters are standard on three
phase units.
Filters must always be used and must be kept clean. When fil-
ters become dirt laden, insufficient air is delivered by the
blower,decreasingyourunit'sefficiencyandincreasingoperat-
ing costs and wear-and-tear on the unit and controls.
Filters should be checked monthly especially since this unit is
used for both heating and cooling.
CONDENSATE DRAIN
Acondensate trap is required to be installed in the condensate
drain. The plumbing must conform to local codes. Use a seal-
ing compound on male pipe threads. Install the condensate
drain line (
!"
" NPTF) to spill into an open drain.
SERVICE ACCESS
Accesstoallserviceablecomponentsisprovidedbythefollow-
ing removable panels:
•Blower service access panel
•Electrical/Filter access panel
•Compressor service access panel
•Refrigerant Connections
Refer to Figures 3 & 4 for location of these access panels and
minimum clearances.
CAUTION This system uses R-410ARefrigerant which oper-
ates at higher pressures than R-22. No other re-
frigerant may be used in this system. Gage sets,
hoses, refrigerant containers and recovery sys-
tems must be designed to handle R-410A. If you
are unsure, consult the equipment manufacturer.
Failure to use R-410Acompatible servicing equip-
ment may result in property damage or injury.
WARNING:Wearsafetyglassesandgloveswhenhandlingre-
frigerants. Failure to follow this warning can cause
serious personal injury.
Refer to Figure 8 for the R-410A Quick Reference Guide.
THERMOSTAT
The room thermostat should be located on an inside wall ap-
proximately 56" above the floor where it will not be subject to
drafts, sun exposure or heat from electrical fixtures or appli-
ances. Follow manufacturer's instructions enclosed with the
thermostat for general installation procedure. Six color coded
insulated wires (minimum #18 AWG) should be used to con-
nect thermostat to unit. See Figure 2.
POWER AND CONTROL WIRING
Fieldwiringtotheunitmustconformtoprovisionsofthecurrent
N.E.C. ANSI/NFPA No. 70 or C.E.C. and/or local ordinances.
Theunitmustbeelectricallygroundedinaccordancewithlocal
codes or, in their absence, with the N.E.C./C.E.C. Voltage tol-
erances which must be maintained at the compressor termi-
nalsduringstartingandrunningconditionsareindicatedonthe
unit Rating Plate and Table 3.
The wiring entering the cabinet must be provided with me-
chanical strain relief.
Afused disconnect switch should be field provided for the unit. If
any of the wire supplied with the unit must be replaced, replace-
ment wire must be of the type shown on the wiring diagram.
Electrical line must be sized properly to carry the load. Each
unit must be wired with a separate branch circuit fed directly
from the meter panel and properly fused.
RefertoFigure 2 for typical field wiringandto the appropriate unit
wiring diagram for control circuit and power wiring information.
035-20188-000-A-0704
Unitary Products Group 3

COMPRESSORS
The scroll compressor used in this product is specifically de-
signedto operate withR-410ARefrigerantandcannotbeinter-
changed.
CAUTION: This system uses R-410ARefrigerant which oper-
atesathigherpressuresthanR-22.Nootherrefrig-
erant may be used in this system.
The compressor also uses a polyolester (POE oil) Mobil 3MA
POE.Thisoilisextremelyhygroscopic,meaningitabsorbswa-
terreadily.POEoilcanabsorb15timesasmuchwaterasother
oils designed for HCFC and CFC refrigerants. Take all neces-
sary precautions to avoid exposure of the oil to the atmos-
phere.
CAUTION: Do not leave the system open to the atmosphere.
Unitdamagecouldoccurduetomoisturebeingab-
sorbed by the POE oil in the system. This type of
oil is highly susceptible to moisture absorption.
POE (polyolester) compressor lubricants are known to cause
long term damage to some synthetic roofing materials.
CAUTION: Exposure, even if immediately cleaned up, may
cause embrittlement (leading to cracking) to occur
in one year or more. When performing any service
that may risk exposure of compressor oil to the
roof, take precautions to protect roofing.
Procedures which risk oil leakage include, but are not limited
to, compressor replacement, repairing refrigerant leaks, re-
placing refrigerant components such as filter drier, pressure
switch, metering device or coil.
Units are shipped with compressor mounting which are
factory-adjusted and ready for operation.
CAUTION: Do not loosen compressor mounting bolts.
PHASING
Three-phase,scrollcompressorsoperateinonlyonedirection.
If the scroll is drawing low amperage, has similar suction and
discharge pressures, or is producing a high noise level, the
scroll is misphased. Change the incoming line connection
phasing to obtain the proper rotation.
CAUTION: Scrollcompressorsrequireproperrotationtooper-
ate properly. Failure to check and correct rotation
may result in property damage.
4 Unitary Products Group
035-20188-000-A-0704
R
G
W
R
C
YY
W 2
C
W 1
O O
G
24 VOLT TRANSFORMER
UNIT TERMINAL STRIP
THERMOSTAT
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can
causeimproperanddangerousoperation.Verifyproperoperationafterservicing.
** = Minimum wire size of 18 AWG
wire should be used for all field
installed 24 volt wire.
**
* = Only required on units with
supplemental electric heat.
*
CONTROL WIRING
NOTE:
HEAT ANTICIPATOR
SHOULD BE SET AT 0.25
AMPS FOR ALL MODELS.
PROGRAMMABLE
THERMOSTAT ONLY
POWER WIRING
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE DISCON-
NECT SWITCH, WIRING &
OVERCURRENT PROTECTION.
REFER TO ELECTRICAL DATA
TABLES TO SIZE THE DISCON-
NECT SWITCH, WIRING &
FIG. 2 - TYPICAL FIELD WIRING DIAGRAM

Unitary Products Group 5
035-20188-000-A-0704
TABLE 3 - PHYSICAL DATA
MODELS BUZ
024 030 036 042 048 060
INDOOR
BLOWER CENTRIFUGAL BLOWER (Dia. x Wd. in.) 10 X 8 10 X 8 11 x 10 11 x 10 11 x 10 11 x 10
FAN MOTOR HP (ECM)
  !"!"!"
1
INDOOR
COIL
ROWS DEEP 233333
FINS PER INCH 15 13 15 16 16 16
FACE AREA (Sq. Ft.) 4.38 4.38 4.38 5.63 5.63 5.63
OUTDOOR
FAN
PROPELLER DIA. (in.) 22 22 22 22 22 22
FAN MOTOR HP
"""""
NOM. CFM TOTAL 1.800 1,800 2,400 2,400 3,000 3,000
OUTDOOR
COIL
ROWS DEEP 112222
FINS PER INCH 20 20 20 20 20 20
FACE AREA (Sq. Ft.) 11.7 11.7 11.7 16.4 16.4 16.4
CHARGE REFRIGERANT R-410A (lbs./oz.) 6 / 0 7 / 4 9 / 6 12 / 0 10 / 10 11 / 8
FILTER FACE AREA (Sq. Ft. / Qty. / Size) 4.28 / 2 / 14" x 22"
COMPRESSOR HERMETIC Type, (Qty. = 1) Scroll Scroll Scroll Scroll Scroll Scroll
MODEL
BUZ POWER SUPPLY
VOLTAGE
LIMITATIONS1COMPRESSOR OUTDOOR
FAN
MOTOR,
FLA
SUPPLY
AIR
BLOWER
MOTOR,
FLA
MINIMUM
CIRCUIT
AMPACITY
MAX.
FUSE
SIZE,
AMPS2
MAX.
HACR
BREAKER
SIZE,
AMPS
UNIT
POWER
FACTOR TRANSFORMER
SIZE (VA)
MIN. MAX. RLA LRA
024 208/230-1-60 187 253 14.3 60.0 0.9 4.8 21.7 30 30 0.96 40
030 208/230-1-60 187 253 16.4 72.5 1.0 4.8 24.2 35 35 0.96 40 208/230-3-60 187 253 11.6 60.0 1.0 4.8 18.8 25 25 0.96 75
460-3-60 414 504 5.0 31.0 0.5 2.4 16.5 25 25 0.96 75
036 208/230-1-60 187 253 17.1 83.0 1.0 6.9 27.2 40 40 0.96 40 208/230-3-60 187 253 12.9 77.0 1.0 6.9 22.3 30 30 0.96 75
460-3-60 414 504 5.7 35.0 0.5 3.5 21.4 30 30 0.96 75
042 208/230-1-60 187 253 20.7 105.0 1.1 6.9 31.3 45 45 0.96 40 208/230-3-60 187 253 15.3 88.0 1.1 6.9 24.8 35 35 0.96 75
460-3-60 414 504 7.1 39.0 0.6 3.5 26.1 40 40 0.96 75
048 208/230-1-60 187 253 20.4 113.0 1.2 6.9 34.5 50 50 0.96 40 208/230-3-60 187 253 16.0 120.0 1.2 6.9 28.1 40 40 0.96 75
460-3-60 414 504 8.3 60.0 0.6 3.5 31.5 50 50 0.96 75
060 208/230-1-60 187 253 26.3 150.0 1.7 8.9 43.4 60 60 0.96 40 208/230-3-60 187 253 17.6 120.0 1.7 8.9 36 50 50 0.96 75
460-3-60 414 504 9.6 70.0 0.9 4.5 39.4 60 60 0.96 75
1 = Rated in accordance with ARI Standard 110, utilization range “A”. 2 = Dual element, time delay type.
TABLE 4 - ELECTRICAL DATA (BASIC UNIT)
ELECTRIC HEAT
CORRECTION
FACTORS
NOMINAL VOLTAGE VOLTAGE KW CAP. MULTIPLIER
240 208
230 .75 .92
480 460 .92

6 Unitary Products Group
035-20188-000-A-0704
TABLE 5 - ELECTRICAL DATA (13 SEER HEAT PUMP / ELECTRIC HEAT)
MODEL
BUZ
POWER
SUPPLY
COMPRESSOR COND.
FAN
MOTOR
FLA
SUPPLY
AIR
BLOWER
MOTOR,
FLA
ELECTRIC HEAT ACCESSORY MINIMUM
CIRCUIT
AMPACITY
MAX.
FUSE
SIZE,
AMPS
MAX.
HACR
BREAKER
SIZE
RLA LRA MODEL NO. KW TOTAL
AMPS
024 208/230-1-60 14.3 60 0.9 4.8 2NH04500506 2NH04500706
2NH04501006
3.8 / 5.0 *
5.6 / 7.5 *
7.5 / 10.0 *
18.1 / 20.8
27.1 / 31.3
36.1 / 41.7
44.3 / 47.7
55.6 / 60.8
66.8 / 73.8
50 / 50
60 / 70
70 / 80
50 / 50
60 / 70
70 / 80
030 208/230-1-60 16.4 72.5 1.0 4.8 2NH04500506
2NH04500706
2NH04501006
2NH04501506
3.8 / 5.0 *
5.6 / 7.5 *
7.5 / 10.0 *
11.3 / 15.0 *
18.1 / 20.8
27.3 / 31.3
36.1 / 41.7
54.2 / 62.5
46.7 / 50.2
58.0 / 63.2
69.3 / 76.3
91.9 / 102.3
50 / 60
60 / 70
70 / 80
100 / 110
50 / 60
60 / 70
70 / 80
100 / 110
036 208/230-1-60 17.1 83.0 1.0 6.9 2NH04500506
2NH04500706
2NH04501006
2NH04501506
3.8 / 5.0 *
5.6 / 7.5 *
7.5 / 10.0 *
11.3 / 15.0 *
18.1 / 20.8
27.1 / 31.3
36.1 / 41.7
54.2 / 62.5
49.7 / 53.2
61.0 / 66.2
72.3 / 79.2
94.9 / 105.3
60 / 60
70 / 70
80 / 80
100 / 110
60 / 60
70 / 70
80 / 80
100 / 110
042 208/230-1-60 20.7 105.0 1.1 6.9 2NP04501006
2NP04501506 7.5 / 10.0 * 11.3 / 15.0 * 36.1 / 41.7 54.2 / 62.5 76.4 / 83.3 99.0 / 109.4 80 / 90 100 / 110 80 / 90 100 / 110
048 208/230-1-60 20.4 113.0 1.2 6.9 2NP04501006
2NP04501506
2NP04502006
2NP04502506
7.5 / 10.0 *
11.3 / 15.0 *
15.0 / 20.0 *
18.8 / 25.0 *
36.1 / 41.7
54.2 / 62.5
72.2 / 83.3
90.3 / 104.2
79.6 / 86.6
102.2 / 112.6
124.8 / 138.6
147.3 / 164.7
90 / 90
110 / 125
125 / 150
150 / 175
90 / 90
110 / 125
125 / 150
150 / 175
060 208/230-1-60 26.3 150.0 1.7 8.9 2NP04501006
2NP04501506
2NP04502006
2NP04502506
7.5 / 10.0 *
11.3 / 15.0 *
15.0 / 20.0 *
18.8 / 25.0 *
36.1 / 41.7
54.2 / 62.5
72.2 / 83.3
90.3 / 104.2
88.5 / 95.4
111.1 / 121.5
133.6 / 147.5
156.2 / 173.6
100 / 110
125 / 125
150 / 150
175 / 175
100 / 110
125 / 125
150 / 150
175 / 175
030 208/230-3-60 11.6 60.0 1.0 4.8 2NH04501025
2NH04501525 7.5 / 10.0 * 11.3 / 15.0 * 20.8 / 24.1 31.3 / 36.1 44.7 / 48.7 57.7 / 63.7 45 / 50 60 / 70 45 / 50 60 / 70
036 208/230-3-60 12.9 77.0 1.0 6.9 2NH04501025
2NH04501525 7.5 / 10.0 * 11.3 / 15.0 * 20.8 / 24.1 31.3 / 36.1 48.7 / 52.7 61.7 / 67.8 60 / 60 70 / 80 60 / 60 70 / 80
042 208/230-3-60 15.3 88.0 1.1 6.9 2NP04501025
2NP04501525 7.5 / 10.0 * 11.3 / 15.0 * 20.8 / 24.1 31.3 / 36.1 51.8 / 55.8 64.9 / 70.9 50 / 60 70 / 70 50 / 60 70 / 70
048 208/230-3-60 16.0 120.0 1.2 6.9 2NP04501025
2NP04501525
2NP04502025
2NP04502525
7.5 / 10.0 *
11.3 / 15.0 *
15.0 / 20.0 *
18.8 / 25.0 *
20.8 / 24.1
31.3 / 36.1
41.7 / 48.1
52.1 / 60.1
51.1 / 55.1
64.1 / 70.2
77.2 / 85.2
90.2 / 100.2
60 / 60
70 / 80
80 / 90
100 / 100
60 / 60
70 / 80
80 / 90
100 / 100
060 208/230-3-60 17.6 120.0 1.7 8.9 2NP04501025
2NP04501525
2NP04502025
2NP04502525
7.5 / 10.0 *
11.3 / 15.0 *
15.0 / 20.0 *
18.8 / 25.0 *
20.8 / 24.1
31.3 / 36.1
41.7 / 48.1
52.1 / 60.1
63.0 / 67.0
77.1 / 83.1
91.1 / 99.1
105.1 / 115.2
70 / 70
80 / 90
100 / 100
110 / 125
70 / 70
80 / 90
100 / 100
110 / 125
030 460-3-60 5.0 31.0 0.5 2.4 2NH04501046
2NH04501546 10.0** 15.0** 12.0 18.0 32.6 41.1 35 45 35 45
036 460-3-60 5.7 35.0 0.5 3.5 2NH04501046
2NH04501546 10.0** 15.0** 12.0 18.0 37.4 45.9 45 50 45 50
042 460-3-60 7.1 39.0 0.6 3.5 2NP04501046
2NP04501546 10.0** 15.0** 12.0 18.0 42.1 50.7 50 60 50 60
048 460-3-60 8.3 60.0 0.6 3.5 2NP04501046
2NP04501546
2NP04502046
2NP04502546
10.0**
15.0**
20.0**
25.0**
12.0
18.0
24.1
30.1
47.5
56.0
64.5
71.4
60
70
80
80
60
70
80
80
060 460-3-60 9.6 70.0 0.9 4.5 2NP04501046
2NP04501546
2NP04502046
2NP04502546
10.0**
15.0**
20.0**
25.0**
12.0
18.0
24.1
30.1
55.4
64.0
72.5
81.0
70
80
90
100
70
80
90
100
Q = Dual element, time delay type.
R = Standard circuit breakers may be used in Canada and on applications
over 60 amps where the heaters are separately fused. *= KW listed is for 240 volts, use table on previous page for 208 or 230 volts.
**= KW listed is for 480 volts, use table on previous page for 460 volts.

Unitary Products Group 7
035-20188-000-A-0704
FIG. 2 - CLEARANCES
3'
MINIMUMCLEARANCEOF1"

ALLSIDESFORTHEFIRST3

'

OFDUCTFOR20&25kW.
ZEROINCHESTHEREAFTER

,

FORALLOTHERHEATERS,
ZEROINCHCLEARANCEALL

SIDESFORENTIRE LENGTH

OFDUCT.
FLEXIBLEDUCT
COLLAR
DESCRIPTION
RESISTANCE, IWG
CFM
500 600 700 800 900 1,000 1,100 1,200 1,300 1,400 1,500 1,600 1,700 1,800 1,900 2,000
Wet Indoor coil 0.01 0.01 0.01 0.02 0.01 0.02 0.03 0.04 0.04 0.03 0.04 0.04 0.05 0.05 0.06 0.07
Economizer 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.07 0.08 0.08
Filter/Frame Kit 0.01 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.03 0.03 0.04 0.05 0.05 0.06 0.06 0.07
Electric Heat 0.02 0.03 0.03 0.03 0.04 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.01 0.11 0.11 0.12
NOTE: 1. Deduct these resistance values from the available external static pressure shown in the respective Blower Performance Table.
2. The pressure thru the economizer is greater for 100% outdoor air then for 100% return air. If the resistance of the return air duct system is less then 0.25 IWG, the unit will deliver
less CFM during full economizer operation.
CLEARANCES (Minimum)
Front 12"
Back 0"
Left Side (Filter Access) 24"
Right Side 24"
Below Unit0"
Above Unit36" (For Condenser Air Discharge)
Q Units may be installed on combustible floors made from wood or class A,
B or C roof covering material.
R Units must be installed outdoors. Overhanging structures or shrubs
should not obstruct outdoor air discharge outlet.
NOTE: FOR UNITS APPLIED WITH A ROOF
CURB,THE MINIMUMCLEARANCEMAYBE
REDUCED FROM 1 INCH TO 1/2 INCH BE-
TWEEN COMBUSTIBLE ROOF CURB MA-
TERIAL AND THE SUPPLY DUCT.
TABLE 7 - ADDITIONAL STATIC PRESSURE RESISTANCE
Q
All units are factory set to TB2-A. Above data includes allowances for a dry indoor coil and no filters. For additional pressure drops, refer to the “Additional Static Pressure Resistance” table.
 
     
    
    

             
           
             
           
            
              
         
            
           
         
         
              
           
           
          
TABLE 6 - SIDE AND BOTTOM SUPPLY AIR BLOWER PERFORMANCE (208/230/460 VOLT
Q
)

8 Unitary Products Group
035-20188-000-A-0704
FIG. 4 - DIMENSIONS
OUTDOOR
COIL
15 4
BACK
SIDE RETURN
AIR OPENING
SIDE SUPPLY
AIR OPENING
BOTTOM RETURN
AIR OPENING
15
"

&
!&
!
!&
!

&
'$
!&

!"

!"

!"
!

15
"

"

BOTTOM SUPPLY
AIR OPENING
!&
!
!"
"%
"
LOW VOLTAGE CONN.
%&
“ DIA. KNOCKOUT
HIGH VOLTAGE CONN.

!!
" DIA. KNOCKOUT
FRONT
ELECTRICAL/FILTER
SERVICE ACCESS
COMPARTMENT PANEL
(OVERALL)
(OVERALL)
"




All dimensions are in inches. They are
subject to change without notice. Certified
dimensions will be provided upon request.
UNIT CONDENSATE
CONNECTION
!"
“ NPTI
(TRAP REQUIRED)
"'
&
(OVERALL)
SIDE SUPPLY
AIR OPENING
SIDE RETURN
AIR OPENING
COMPRESSOR
SERVICE ACCESS
COMPARTMENT PANEL
"
%
"
"
%
"
HIGH VOLTAGE CONN.

!$"
" DIA. KNOCKOUT
HIGH VOLTAGE CONN.
%&
" DIA. KNOCKOUT
&
"
&
"
REFRIGERANT
CONNECTIONS
“A” UNIT SIZE DIMENSION
“A”
024 - 036 33-1/2
042 - 060 41-1/2
CONDENSATE
DRAIN
!"
“ NPTI
LOW VOLTAGE CONN.
%&
“ DIA. KNOCKOUT
HIGH VOLTAGE
CONN.

!!
“ x
%&
" DIA.
KNOCKOUT
FRONT
6

"!

"

$
!"

Anti-short Cycle Timer
Thisunit hasananti-shortcycle timer builtintothe defrostcon-
trol.Thistimerwillnotpermit the compressor to startwithin five
minutesafter thecompletionofthe lastcycleorpowerinterrup-
tion. To bypass the anti-short cycle feature, short the “TEST”
pins together for 2 seconds.
The following sequences of operation are based on using a
standard single-stage heat pump thermostat.
COOLING OPERATION
1. When the fan switch on the thermostat is in the “ON” posi-
tion,the 24 voltsat“G” will bringontheindoorblowermotor
at the cooling airflow. When the fan switch on the thermo-
stat is in the “AUTO” position, the blower operates only
when there is a call for cooling by the thermostat.
2. On a call for cooling, the thermostat sends 24 volts to “Y”
and “O” on the fan control and defrost control boards. The
reversing valve solenoid is energized, and after the anti-
short cycle period is complete contactor coil M1 is ener-
gized.Powerissuppliedtothecompressorandoutdoorfan
motor, andthereversingvalveswitchedtothecoolingposi-
tion.Whenthefanswitchonthethermostatisinthe“AUTO”
positiontheindoorblowermotor is energized at the cooling
airflow.
3. When the demand for cooling has been satisfied, the 24
volt “Y” signal is removed, and the M1 contactor is de-
energized. When the fan switch on the thermostat is in the
“ON” position, the indoor blower motor continues to run. If
the fan switch is in the “AUTO” position. the indoor motor
ramps down over a 30-second period.
HEATING OPERATION
1. When the fan switch on the thermostat is in the “ON” posi-
tion,the24voltsat “G” brings on the indoor blower motor at
theheatingflow.Whenthefanswitchonthethermostatisin
the “AUTO” position, the blower operates when there is a
call for heating by the thermostat.
2. Onacallforheating,thethermostatsends24voltsto“Y”on
the fan control board. After the anti-short cycle period is
complete, the 24 volt signal energizes contactor coil M1
and power is supplied to the compressor and outdoor fan
motor. The reversing valve remains in the heating position.
Whenthe fan switchon the thermostatis inthe “AUTO”po-
sition,theindoorblowerisenergizedattheheatingairflow.
3. For units equipped with supplementary electric heat, when
the heat pump cannot meet the demand, the thermostat
“W” sends 24 volts to “W2” on the fan control board. This
signalalso is sentthrough the defrost control terminals “W”
and “W6” and back to the fan control “W1”. The 24 volt sig-
nal energizes all stages of electric heat.
4 When the heating demand is satisfied, the electric heat is
de-energized when the 24 volt “W” signal is removed, and
the M1 contactor is de-energized when the 24 volt “Y” sig-
nal is removed. When the fan switch on the thermostat is in
the“ON”position,theindoorblowercontinuestorun.When
the fan switch is in the “AUTO” position, the indoor blower
motor ramps down over a 15-second period.
Please refer to Tables 8 and 9 for more information.
Defrost Operation
The demand defrost control implements a temperature differ-
ential (”delta-T”) demand defrost algorithm. The heat pump is
allowedto operate in theheatingmodeuntilthe combination of
outdoor ambient and outdoor coil temperatures indicate that
defrostingisnecessary.Whencoiltemperatureisbelowtheini-
tiate point for the ambient temperature continuously for 4-1/2
minutes, the heat pump is put into a defrost cycle. This 4-1/2
minutetimer eliminates unnecessary defrostcycles caused by
refrigeration surges such as those that occur at the start of a
heating cycle.
Atimed inhibit feature prevents the system from responding to
a call for defrost less than 20 minutes after the initiation of the
previous defrost. After the 20 minute inhibit time has expired,
temperatureconditions must call fordefrostcontinuouslyfor4-
1/2minutesbeforeadefrostcycleisinitiated.Atemperaturein-
hibit feature prohibits defrost if the coil temperature is above
40°F.
A forced-defrost feature puts the system into a defrost period
every 6 hours and 4 minutes to recirculate lubricants, unless
the coil temperature is above 40°F. All defrost timing occurs
only while the compressor is on.
During the defrost mode, the defrost control will provide a 24
volt signal from terminal “W1/66” to the fan control terminal
“W1”.Thissignalwillenergizeelectricheatstage1,iftheunitis
so equipped.
For trouble shooting purposes, the defrost cycle can be manu-
ally initiated by shorting the “TEST” pins together for 5 sec-
onds.Defrostwillterminatenormallyduringthe“TEST”mode.
Heat Pump Safety Switch Operation
The unit is equipped with a safety package. The refrigeration
system will be protected against high or low refrigerant pres-
sure. If either of these safety switches opens, the unit will be
shutofffor the5minuteanti-shortcycle time.Oncethishas ex-
pired, a six hour elapsed run timer begins. If a second opening
of a safety switch occurs during this six hour period, the com-
pressor will be locked out.
Resetting the lockout function is accomplished by;
1. Removing power from the control's thermostat 1st stage
(Y)inputforatimenottoexceed5seconds(ON-OFF-ON).
2. Removing power from “R” for more than 2 seconds.
3. Shortingthe“TEST”pinstogetherformorethan2seconds.
Electric Heat Limit Switch Operation
Thelimit switchrespondstoover temperatureconditionsinthe
airduct.Opening of the device resultsin dropping power tothe
relays. The control logic will also respond by turning off the re-
lays. After four limit cycle trips the unit goes into a 1 hour soft
lockout period. If during this period the control “sees” another
limitcycle, the unit willgointoahardlockout condition. Once in
a hard lockout state, the fan is locked on and the heaters are
disabled. Only a power cycle will clear this state.
During the soft lockout period, the fan responds to thermostat
input but the heaters are enabled. This is to sense a failed
heater relay. The limit cycle count is reset at the start of a heat
request. If the limit remains open for period of 80 seconds or
more, the control is immediately put into a hard lockout condi-
tion. Only a power cycle will clear this state.
Unitary Products Group 9
035-20188-000-A-0704 SEQUENCE OF OPERATION
SECURE OWNER'S APPROVAL:When the system is
functioning properly, secure the owner's approval. Show him
the location of all disconnect switches and the thermostat.
Teachhimhow to startand stop theunit and how to adjusttem-
perature settings within the limitations of the system.

10 Unitary Products Group
035-20188-000-A-0704
SIGNAL STATE BOARD FUNCTION
“G” ON FAN INSTANT ON
OFF FAN INSTANT OFF
“G” & “Y” & “O” ON FAN INSTANT ON
COMPRESSOR AND OUTDOOR FAN INSTANT ON (AFTER ANTI-SHORT CYCLE DELAY)
REVERSING VALVE ENERGIZED
SYSTEM OPERATES IN COOLING
OFF COMPRESSOR AND OUTDOOR FAN INSTANT OFF
FAN 60 SEC. DELAY OFF
“G” & “Y” ON FAN INSTANT ON
COMPRESSOR AND OUTDOOR FAN INSTANT ON (AFTER ANTI-SHORT CYCLE DELAY)
SYSTEM OPERATES IN HEATING
OFF COMPRESSOR AND OUTDOOR FAN INSTANT OFF
FAN 60 SEC. DELAY OFF
“G” & “W”
ON FAN INSTANT ON
HEATER BANK 1 ELEC. HEAT INSTANT ON
HEATER BANK 2 ELEC. HEAT 10 SEC. DELAY ON
HEATER BANK 3 ELEC. HEAT 20 SEC. DELAY ON
OFF HEATER BANK 3 ELEC. HEAT INSTANT OFF
HEATER BANK 2 ELEC. HEAT

SEC. DELAY OFF
HEATER BANK 1 ELEC. HEAT 1 SEC. DELAY OFF
FAN 10 SEC. DELAY OFF
“G” & “Y” & “W”
ON
FAN INSTANT ON
COMPRESSOR AND OUTDOOR FAN INSTANT ON
SYSTEM OPERATES IN HEATING
HEATER BANK 1 ELEC. HEAT INSTANT ON
HEATER BANK 2 ELEC. HEAT 10 SEC. DELAY ON
HEATER BANK 3 ELEC. HEAT 20 SEC. DELAY ON
OFF
COMPRESSOR AND OUTDOOR FAN INSTANT OFF
HEATER BANK 3 ELEC. HEAT INSTANT OFF
HEATER BANK 2 ELEC. HEAT

SEC. DELAY OFF
HEATER BANK 1 ELEC. HEAT 1 SEC. DELAY OFF
FAN 60 SEC. DELAY OFF
“W”
ON FAN INSTANT ON
HEATER BANK 1 ELEC. HEAT INSTANT ON
HEATER BANK 2 ELEC. HEAT 10 SEC. DELAY ON
HEATER BANK 3 ELEC. HEAT 20 SEC. DELAY ON
OFF HEATER BANK 3 ELEC. HEAT INSTANT OFF
HEATER BANK 2 ELEC. HEAT

SEC. DELAY OFF
HEATER BANK 1 ELEC. HEAT 1 SEC. DELAY OFF
FAN 10 SEC. DELAY OFF
TABLE 8 - THERMOSTAT SIGNALS (SINGLE PHASE UNITS)

Unitary Products Group 11
035-20188-000-A-0704
TABLE 9 - THERMOSTAT SIGNALS (THREE PHASE UNITS)
SIGNAL STATE BOARD FUNCTION
“G” ON FAN INSTANT ON
OFF FAN INSTANT OFF
“G” & “Y” & “O” ON FAN INSTANT ON
COMPRESSOR AND OUTDOOR FAN INSTANT ON (AFTER ANTI-SHORT CYCLE DELAY)
REVERSING VALVE ENERGIZED
SYSTEM OPERATES IN COOLING
OFF COMPRESSOR AND OUTDOOR FAN INSTANT OFF
FAN 60 SEC. DELAY OFF
“G” & “Y” ON FAN INSTANT ON
COMPRESSOR AND OUTDOOR FAN INSTANT ON (AFTER ANTI-SHORT CYCLE DELAY)
SYSTEM OPERATES IN HEATING
OFF COMPRESSOR AND OUTDOOR FAN INSTANT OFF
FAN 60 SEC. DELAY OFF
“G” & “W”
ON FAN INSTANT ON HEATER BANK 1, 2 & 3 ELEC. HEAT INSTANT ON
HEATER BANK 4, 5 & 6 ELEC. HEAT 10 SEC. DELAY ON
OFF HEATER BANK 4, 5 & 6 ELEC. HEAT INSTANT OFF HEATER BANK 1, 2 & 3 ELEC. HEAT

SEC. DELAY OFF
FAN 10 SEC. DELAY OFF
“G” & “Y” & “W”
ON
FAN INSTANT ON
COMPRESSOR AND OUTDOOR FAN INSTANT ON
SYSTEM OPERATES IN HEATING
HEATER BANK 1, 2 & 3 ELEC. HEAT INSTANT ON
HEATER BANK 4, 5 & 6 ELEC. HEAT 10 SEC. DELAY ON
OFF COMPRESSOR AND OUTDOOR FAN INSTANT OFF
HEATER BANK 4, 5 & 6 ELEC. HEAT INSTANT OFF
HEATER BANK 1, 2 & 3 ELEC. HEAT

SEC. DELAY OFF
FAN 60 SEC. DELAY OFF
“W”
ON FAN INSTANT ON HEATER BANK 1, 2 & 3 ELEC. HEAT INSTANT ON
HEATER BANK 4, 5 & 6 ELEC. HEAT 10 SEC. DELAY ON
OFF HEATER BANK 4, 5 & 6 ELEC. HEAT INSTANT OFF HEATER BANK 1, 2 & 3 ELEC. HEAT

SEC. DELAY OFF
FAN 10 SEC. DELAY OFF

12 Unitary Products Group
035-20188-000-A-0704
TROUBLESHOOTING
WARNING:Troubleshooting of components necessarily re-
quires opening the electrical control box with the
power connected to the unit. Use extreme care
when working with live circuit! Check the unit
nameplateforthecorrect rangebeforemakingany
connections with line terminals.
CAUTION: The wire number or color and terminal designa-
tions referred to may vary. Check the wiring label
inside the control box access panel for the correct
wiring.
CAUTION: If the variable speed motor found in the BAUZ
models operates erratically, check the fan control
boardfor the presenceof a break-offtab. Remove
tab if present.
OUTDOORCOIL-Dirtshouldnotbeallowedtoaccumulateon
theoutdoorcoilsurfaceorotherpartsintheaircircuit.Cleaning
should be as often as necessary to keep the coil clean. Use a
brush, vacuum cleaner attachment, or other suitable means. If
waterisusedtocleanthecoil, besurethat thepowerto theunit
is shut off prior to cleaning.
CAUTION: Exercise care when cleaning the coil so that the
coil fins are not damaged.
Donotpermitthehotcondenserairdischargetobe
obstructed by overhanging structures or shrubs.
NORMAL MAINTENANCE
WARNING:Prior to any of the following maintenance proce-
dures, shut off all power to the unit, to avoid per-
sonal injury.
Periodic maintenance consists of changing or cleaning filters
and general cleaning of the outdoor coil.
FILTERS- Inspectonceamonth. Replace Disposableorclean
Permanent Type as necessary. DO NOT replace Permanent
Type with Disposable.
MOTORS - Indoor and outdoor fan motors are permanently lu-
bricated and require no maintenance.
MAINTENANCE

Unitary Products Group 13
035-20188-000-A-0704
FIG. 5 - TYPICAL WIRING DIAGRAM BUZ MODELS- 208/230-1-60 POWER SUPPLY

14 Unitary Products Group
035-20188-000-A-0704
FIG. 6 - TYPICAL WIRING DIAGRAM BUZ - 208/230-3-60 POWER SUPPLY

Unitary Products Group 15
035-20188-000-A-0704
FIG. 7 - TYPICAL WIRING DIAGRAM BUZ - 460-3-60 POWER SUPPLY

Unitary Products Group
5005 York Drive, Norman, Oklahoma 73069
Subject to change without notice. Printed in U.S.A.
Copyright ©by York International Corporation 2004. All Rights Reserved. Supersedes: Nothing 035-20188-000-A-0704
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#     %53 6  %53   ! "   !   %53
'         
6    !   "     !+      
   
FIG. 8 - R-410A QUICK REFERENCE GUIDE