American Standard allegiance 16 User guide

Application Guide
ALG16-APG01-EN
American Standard Allegiance and Heritage 16
Two stage cooling units and heat pumps
Low Outdoor Operating Temperature
Unit Mounting
Minimum Clearances
Refrigerant Piping Limitations
American Standard Allegiance / Heritage 16

Pg. 2
The purpose of this bulletin is to provide cumulative application criteria as related to the
American Standard Allegiance / Heritage16
cooling units and heat pumps.
This bulletin discusses:
I. Off Season Cooling Operation
II. Unit Mounting
III. Minimum Operating Clearances
IV. Refrigerant Piping Limitations
ISSUED BY:
Product Training and Application Department
American Standard
Tyler, Texas

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Section I - Off Season Cooling Operation
The American Standard Allegiance / Heritage 16 may be operated in the cooling mode to
45oF as shipped from the factory. These units shall only be matched with variable speed air
handling units or variable speed furnace / coil combinations. The coils have factory supplied
non - bleed TXV’s.
Please refer to the accessory table below when determining if the unit will operate at the
specified conditions as well as required accessories.
Evaporator Defrost Control Kits (EDC)
AY28X079 - Cooling only
AY28X084 - Heat pumps
Compressor Crankcase Heater Kit - BAYCCHT
Compressor Hard Start Kits - BAYKSKT
Windshields
Windshields may be required, please refer to page 14 of this document for information
reagarding the installation of wind barriers.
ERUTAREPMETDO@SEIROSSECCADERIUQER
ledoM54
0
F04/03
0
F0
0
F
61ecnaigellA deppihSsA /tratsdraH/CDE
retaeHpmuSrosserpmoC
toN
devorppA
61egatireH deppihSsA /tratSdraH/CDE
retaeHpmuSrosserpmoC
toN
devorppA
Unit Model Required Required Unit Model Required Required
CCHT Hard Start Kit CCHT Hard Start Kit
4A7A6024A BAYCCHT301 BAYKSKT260 4A6H6024A Factory BAYKSKT260
Installed
4A7A6036A BAYCCHT301 BAYKSKT260 4A6H6036A Factory BAYKSKT260
Installed
4A7A6048A BAYCCHT301 BAYKSKT260 4A6H6048A Factory BAYKSKT260
Installed
4A7A6060A Factory Factory 4A6H6060A Factory Factory
Installed Installed Installed Installed

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Typical wiring when using the evaporator defrost control (EDC) for operation
Cooling Split System and AY28X079 Evaporator Defrost Control
R
Y1
Y2
G
W
W2
B
(R)
(O)
(BK)
(Y)
(G)
(W1)
(W2)
(W3)
(B)
Y low (not used)
R
Y 2
Y 1
G
W1
X2
B
O
EDR-1
EDC
EDR
(R)
(O)
(Y)
(BK)
(G)
(W1)
(W2)
(W3)
(B)
Y low (not used)
EDC
Heat Pump Split System and AY28X084 Evaporator Defrost Control
4A7A6 4TEE-E Thermostat
4TEE-E
Red
Yellow / Red
Yellow
X2
Blue
Orange
Thermostat
4A6H6
Note: Remove factory installed jumper between R and BK at the fan control board. Connect R to O on the terminal strip These terminals on the AHU / Gas furnace must be jumpered together.
Please refer to the equipment’s installation manual for complete control wiring.
Red
Yellow /
Black
Yellow /
Red
Blue

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SECTION II - Unit Mounting
This section describes appropriate methods for mounting and securing the Allegiance /
Heritage 16, however, if these units are to be mounted in a region where high winds are an
issue, please refer to the American Standard BAYECMT001 extreme conditions mounting
kit installation instructions publication Number #18-HE44D1-* (* latest version ). The
BAYECMT001 is not suitable for seizmic restraint; please refer to local professionals who
specialize in seizmic restraint.
When mounting or securing American Standard 1 - 6 ton condensing units and heat pumps
please observe the following:
1. Anytime the unit is to be supported from the edge, the supporting material shall
extend a minimum of two inches under the perimeter of the unit’s base.
2. The mounting hole locations are molded in the basepan, however, they must be
drilled.
a) Hole locations are identified on page 6.
b) Hole diameter is 5/16”.
3. Washers should be placed in between the fastener head and the basepan.
4. American Standard recommends supporting the center of the unit.
5. Base 4 pans have four mounting holes.
Refer to the dimension tables for actual unit size.
Please refer to the following illustrations for dimensions and general information.
Drawing for illustration purposes only.

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BASE PAN MOUNTING HOLE LOCATIONS
( location only, holes must be drilled )
support must extend 2” from the basepan perimeter
If supporting the base pan from the perimeter, the support must extend under the base pan at least 2”.
American Standard recommends supporting the middle of the base pan with a cross member.
support center of unit
Drill 4 places
Drill 4 places
support must extend 2” from the basepan perimeter
support center of unit
BASE 4
BASE 3

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Section III - Minimum Operating Clearances
This section discusses applying a condensing unit / heat pump in installations where there
are space constraints.
These concerns must be addressed:
1. System Operation - Adequate airflow must be provided to the condensing unit / heat
pump in order to enable appropriate heat transfer. If this is accomplished, head
pressure will remain within an effective operating range.
2. System Serviceability - Proper space must be allowed for the HVAC service techni-
cian to properly maintain the condensing unit / heat pump. Furthermore, space must
be allowed for major component change out in the event of a failure. Working space
is determined by the National Electric Code.
3. Space Maintenance - Appropriate area must be allowed in order to maintain the
ground area where the units are positioned to prohibit debris from collecting on the
panels, thus further providing unobstructed airflow to the condensing unit.
4. State, Local Codes, and National Codes shall prevail. Check with the local jurisdic-
tion before installation to assure compliance.
Numerous projects require reduced clearances between outdoor units and adjacent
walls, fences and other units. The obstruction in question is usually one of the following:
1. One or more walls of an adjacent building.
2. Fences or barriers provided to reduce sound transmission or visually screen the
equipment.
3. Other outdoor units in a multi-unit installation.
4. Overhangs
5. A combination of the above.
The prime considerations involved in establishing minimum clearances are:
1. Adequate airflow to the outdoor coil with minimum recirculation.
2. Service access to the equipment.
3. Compliance with the National Electric Code and other applicable codes.
4. Design temperature - Design temperatures greater than 105°F require additional
consideration.
I. In order to assure that adequate airflow reaches the Allegiance/Heritage 16 condensing
unit, size free air passages at 300 feet per minute (FPM) maximum velocity. See con-
densing unit airflow performance on page 16 of this document; or, for the most current
information, consult the unit’s product data manual.
II. The importance of providing sufficient access for maintenance and service to equip-
ment cannot be overemphasized. The HVAC service technician’s job may be performed
with greater ease and at lower cost if adequate space is allowed.
III. Knowledge of the National Electric Code and other applicable codes for the job site
location is a necessity in order to satisfy local inspectors. These codes are in place for
service as well as safety.
IV. Be sure to read all provisions and footnotes contained in this document. When ambient
temperatures exceed 105°F, more space may be required for minimum operating clear-
ances.

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1. Installation of a single Allegiance / Heritage 16 condensing unit / heat pump in a
corner with unrestricted top clearance.
A) For locations where the design ambient temperature is below 105°F:
1) 1’ clearance on 2 sides - If shrubbery is to be placed by the unit’s other side, then
allow 1’ minimum clearance from the unit.
2) Service access side minimum 3’. Consult Local, State, and National Electric
Codes for minimum service clearance.
B) For locations where the design ambient temperature exceeds 105°F:
1) 1.5’ clearance on 2 walls. - If shrubbery is to be placed by the unit other side,
then allow 1’ minimum clearance from the unit.
2) Service access side minimum 3’.
C) If unit is located in such a way that service panel is facing the wall:
1) NEC requires minimum 3’ between the unit and the wall.
a) This space may be increased to 3.5’. Consult the National Electric Code for
more information regarding minimum clearances for working spaces.
2. Installation of two or more Allegiance / Heritage 16 units where two adjacent walls
form a corner and unrestricted top clearance.
A) For locations where the design ambient temperature is below 105°F:
1) Corner unit shall have1.5’ clearance from side wall and 1’ clearance from back
wall.
2) 1’ clearance in between units, unless service panels face each other. ( if service
panels face each other, this clearance may be increased to 4’ per NEC)
B) For locations where the design ambient temperature exceeds 105°F:
1) 2’ clearance from both walls.
2) 2’ clearance in between units, unless service panels face each other. ( if service
panels face each other, this clearance may be increased to 4’ per NEC).
C) If unit’s are located in such a way that the service panels are facing the wall:
1) NEC requires minimum 3’ between the unit and the wall
a) This space may be increased to 3.5’. Consult the most current edition of the
National Electric Code for more information regarding minimum clearances
for working spaces.
SERVICE ACCESS PANEL SIDE 3’ minimum clearance
Service Panel
-1.0’-
min
-1.0’-
min
–1.0’–
min
–1.5’–
min
—1.0’—
min
—1.0’—
min
-1.0’-
min
3.0’ min 5’ minimum unrestricted top
clearance shall be provided.
5’ minimum unrestricted top
clearance shall be provided.
–1.0’–
min
–1.0’–
min

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3. Single Allegiance / Heritage 16 condensing unit / heat pump in a fenced corner
with unrestricted top clearance.
A) For locations where the design ambient temperature is below 105°F:
1) 1’ clearance from both walls.
2) 1’ fence clearance - openings shall be provided to allow free air passage to unit
(Free air passage shall be sized @ 300 FPM Velocity).
3) Service access shall be 3’ minimum.
B) For locations where the design ambient temperature exceeds 105°F:
1) 1.5’ clearance from both walls.
2) Service access shall be 3’ minimum.
3) 1.5’ clearance from fence-openings shall be provided to allow free air passage to
unit (Free air passage shall be sized @ a maximum of 300 FPM Velocity).
C) If unit is located in such a way that service panel is facing the wall:
1) NEC requires minimum 3’ between the unit and the wall.
a) This space may be increased to 3.5’. Consult the National Electric Code for
more information regarding minimum clearances for working spaces.
*Service Panel
*Service Panel
—1.0’—
min
—1.0’—
min
—1.0’—
min
—1.0’—
min
1234
1
23
4
1234
1234
1
23
4
1234
12
12
12
12
12
12
12
12
1234
1234
12345
12345
12
12
12
12
12
12
12
12
12
12
—1.0’—
min
—3.0’—
min —1.0’—
min
—3.0’—
min
123
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
123
SIngle Unit - Solid Fence
Solid Fence: Fence height not to exceed top of unit. Provide openings in fence that will allow maximum 300 FPM air velocity.
These openings shall be located at the lower portion of the fence. If acceptable, the lower portion of the fence may be cut to
provide open bottom clearance provided that debris, grass and vegetation will not obstruct air passageway.
* If removable panels are used and acceptable to local inspection agency, the clearance to the removable
panel may be reduced to 2’.
123456
123456
opening size @
300 FPM
maximum velocity
5’ minimum top clearance required.
Unit shall be positioned where not affected
by water run off from roof.

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123
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1
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1
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1
2
3
1
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3
1
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123
Multiple Units Solid Fence
* If removable panels are used and acceptable to local inspection agency, the clearance to the removable panel may
be reduced to 2’.
123456
123456
1234567
1234567
opening size @
300 FPM
maximum velocity
SERVICE ACCESS PANEL SIDE*
—1.5’—
min
—1.5’—
min
—1.5’—
min
—1.5’—
min
—1.5’—
min
—1.5’—
min
4. Installation of two or more Allegiance / Heritage 16 units where two adjacent walls
form a fenced corner with unobstructed top clearance.
A) For locations where the design ambient temperature is below 105°F:
1) Corner unit shall have1.5’ clearance from one wall and 1’ clearance from the
other wall.
2) 1.5’ clearance in between units.
3) NEC requires 3’clearance for service. This may be reduced to 2’ if removable
panels are used.
4) Free air passage shall be cut in order to allow maximum 300 FPM air velocity.
B) For locations where the design ambient temperature exceeds 105°F:
1) Corner unit shall have 2’ clearance from one wall and 1.5’ clearance from the
other wall.
2) 2’ clearance in between units.
3) NEC requires 3’ clearance for service. This may be reduced to 2.5’ if removable
panels are used.
C) If unit’s are located in such a way that the service panels are facing the wall:
1) NEC requires minimum 3’ between the unit and the wall.
a) This space may be increased to 3.5’. Consult the most current edition of the
National Electric Code for more information regarding minimum clearances
for working spaces.
Solid Fence: Fence height not to exceed top of unit. Provide openings in fence that will allow maximum 300 FPM air velocity. These
openings shall be located at the lower portion of the fence. If acceptable, the lower portion of the fence may be cut to provide open bottom
clearance provided that debris, grass and vegetation will not obstruct air passageway.
*For best performance, it is recommended to not construct cover over the unit’s in this type of multiple unit application.
—3.0’—
min
—3.0’—
min
—3.0’—
min
—1.5’—
min
12345
12345
12345
12345
1234
1234
12
12
12
12
12
12
12
12
12
5’ minimum top clearance required.*
Unit shall be positioned where not affected by water run off from roof.