Bard W12AAA, W12AAAA, W12AAAD, W12AAAK Installation Instructions Manual

INSTALLATION INSTRUCTIONS

WALL MOUNTED

P ACKAGE AIR CONDITIONERS

Model:

W12AAA

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

Since 1914....Moving ahead just as planned.

Manual: 2100-618
Supersedes: NEW
File: Tab 16
Date: 06-04-14

Page 1 of 21

CONTENTS

Getting Other Informations and Publications .........3

Wall Mount General Information

Air Conditioner Wall Mount Model Nomenclature
Shipping Damage
General
Duct Work
Filters
Fresh Air Intake
Condensate Drain

Installation Instructions

Wall Mounting Information
Mounting the Unit
Wiring – Main Power
Wiring – Low Voltage Wiring

Figures

Figure 1 Unit Dimensions ......................................5

Figure 2 Fresh Air Damper ....................................7

Figure 3 Mounting Instructions ..............................9

Figure 4 Wall Mounting Instructions ....................10

Figure 5 Wall Mounting Instructions ....................10

Figure 6 Common Wall Mounting Installations ....11

Figure 7 Low Voltage Wiring –
Basic A/C with Optional Electric Heat
No Economizer or Ventilation

Packages ..............................................13

Figure 8 Low Voltage Wiring –

A/C with Programmable Thermostat .....14

Figure 9 Low Voltage Wiring –
A/C with Non-Programmable

Thermostat ............................................15

Figure 10 Low Voltage Wiring –
1-Stage A/C with Optional Electric
Heat with ECONWM Style

Economizer ...........................................16

Figure 11 Fan Blade Setting Dimensions ..............20

.....................................................................6

.................................................................7

........................................................................7

.....................................................6

.........................................................7

.....................................................7

........................................8

......................................................8

...............................................12

...................................12

.....4

Start Up

Requirements: R-410A
Important Installer Note
Service Hints
High & Low Pressure Switch
Sequence of Operation
Compressor Control Module
Adjustments
Pressure Service Ports

Troubleshooting

Fan Blade Setting Dimension
Refrigerant Charge
Pressure Table
Optional Field Installed Accessories

Tables

Table 1 Electric Heat Table ..................................4

Table 2 Electrical Heat Specications ..................6

Table 3 Wall Thermostat ....................................12

Table 4 Thermostat Wire Size ...........................12

Table 5 Fan Blade Dimensions ..........................20

Table 6 Indoor Blower Performance ..................20

Table 7 Rated CFM and ESP Recommended

Airow Range ........................................20

Table 8 Maximum ESP of Operation

Electric Heat Only .................................20

Table 9 Pressure Table - Cooling .......................21

T able 10 Optional Accessories ............................21

...........................................................18

............................................................19

........................................................21

............................................17

...........................................18

...................................18

...........................................18

...................................18

...........................................19

.................................20

.................................................20

.......................21

Manual 2100-618
Page 2 of 21

GETTING OTHER INFORMATION and PUBLICATIONS

These publications can help you install the air

conditioner or heat pump. You can usually nd these

at your local library or purchase them directly from the
publisher. Be sure to consult current edition of each
standard.

National Electrical Code .......................ANSI/NFPA 70

Standard for the Installation of .......... ANSI/NFPA 90A

Air Conditioning and
Ventilating Systems

Standard for Warm Air Heating .........ANSI/NFPA 90B

and Air Conditioning Systems

Load Calculation for .......................... ACCA Manual J

Residential Winter and
Summer Air Conditioning

Duct Design for .................................ACCA Manual D

Residential Winter and
Summer Air Conditioning
and Equipment Selection

For more information, contact these
publishers:

ACCA Air Conditioning Contractors of America

1712 New Hampshire Avenue NW
Washington, DC 20009
Telephone: [phone]
Fax: [phone]

ANSI American National Standards Institute
11 West Street, 13th Floor

New York, NY 10036
Telephone: [phone]
Fax: [phone]

ASHRAE American Society of Heating, Refrigerating

1791 Tullie Circle, NE

Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]

NFPA National Fire Protection Association
Batterymarch Park

P.O. Box 9101
Quincy, MA 02269-9901
Telephone: [phone]
Fax: [phone]

and Air Conditioning Engineers, Inc.

Manual 2100-618
Page 3 of 21

WALL MOUNT GENERAL INFORMATION

AIR CONDITIONER WALL MOUNT MODEL NOMENCLATURE

W 12 A A A A 00 X X X X X J

MODEL

NUMBER

CAPACITY

12 - 1 Ton

AIR CONDITIONER

1 STAGE

REVISIONS

EFFICIENCY

A - 10 EER

VOLTS & PHASE

A - 230/208/60/1
D - 240/220/50/1
K - 115/60/1

KW

00 - No KW
02 - 2.2 KW
03 - 3.6 KW
05 - 5.0 KW
0Z - Circuit Breaker Only

CONTROL
MODULES

X - Standard Low Pressure Switch,
High Pressure Switch, Compressor
Control Module
E - X + Low Ambient Control
J - X + Low Ambient Control and
Alarm Relay

COIL OPTIONS

X - Standard Coils
1 - Phenolic Coated Evaporator
2 - Phenolic Coated Condenser
3 - Phenolic Coated Evaporator and
Condenser

OUTLET OPTIONS

X - Front

COLOR OPTIONS

X - Beige
1 - White
4 - Buckeye Gray
5 - Desert Brown
8 - Dark Bronze

FILTER OPTIONS

X - 1-Inch Throwaway
(Standard)
W - 1-Inch Washable
P - 2-Inch Pleated

VENTILATION OPTIONS

X - Barometric Fresh Air Damper (Standard)
B - Blank-off Plate
E - Economizer (Internal) - Fully Modulating with Exhaust
V - Commercial Ventilator - Motorized with Exhaust

TABLE 1

ELECTRIC HEAT TABLE

Models

KW

A

02 18.3 7,985
03 15.0 12,760 13.0 9,705 15.0 12,760 13.8 10,735
05 20.8 17,540 18.1 13,275

j With blower watts included

W12AAAA W12AAAK W12AAAD

240V 208V 120V 240V 220V

j

BTU

A

j

BTU

A

j

BTU

A

j

BTU

A

j

BTU

Manual 2100-618
Page 4 of 21

ENTRANCE

LOW VOLTAGE

ENTRANCE

ELECTRICAL

BUILT-IN RAIN

HOOD 2° PITCH

21.88

1.50

48.00

14.63

ACCESS

HEATER & FILTER

VENTILATION
AIR

CONDENSER AIRFLOW
IS BLOW THRU

19.72

19.72

3.88

31.06

20.43

ELECTRICAL
ENTRANCE

SHIPPING LOCATION

OPTIONAL

TOP RAIN FLASHING

DRAIN HOSE

10.00

5.00

30.13

17.00

5.00

32.00

22.25

25.750

2.50

MIS-3599

FRONT VIEW

BACK VIEW

RIGHT SIDE VIEW

FIGURE 1

UNIT DIMENSIONS

NOTE: Maintain a minimum of 20 inches clearance on right side to allow access to control panel and allow proper airow to outdoor

condenser coil. Allow 15 inches on left side.

Manual 2100-618
Page 5 of 21

TABLE 2

ELECTRICAL HEAT SPECIFICATIONS

SINGLE CIRCUIT

Rated Volts

Models

W12AAAA0Z

A03
A05

W12AAAK00

K02

W12AAAD00

D03

j Maximum size of the time delay fuse or HACR type circuit breaker for protection of eld wiring conductors.

Based on 75°C copper wire. All wiring must conform to NEC and all local codes.

These “Minimum Circuit Ampacity” values are to be used for sizing the eld power conductors. Refer to the National



Electrical Code (latest revision), article 310 for power conductor sizing.

CAUTION: When more than one eld power conductor circuit is run through one conduit, the conductors must be

derated. Pay special attention to note 8 of table 310 regarding Ampacity
conductors are in a raceway.

and

Phase

230/208-1

115-1

240/220-1

No. Field

Power

Circuits

1
1
1

1
1

1
1



Minimum

Circuit

Ampacity

9
20
27

17
26

9
20

j

Maximum

External Fuse

or Circuit

Breaker

15
20
30

30
30

15
20

Adjustment Factors when more than 3



Field Power

Wire Size

14
12
10

10
10

14
12

Ground

Wire Size

14
12
10

10
10

14
12



SHIPPING DAMAGE

Upon receipt of equipment, the carton should be checked
for external signs of shipping damage. If damage is
found, the receiving party must contact the last carrier
immediately, preferably in writing, requesting inspection
by the carrier’s agent.

GENERAL

The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians.

The refrigerant system is completely assembled and
charged. All internal wiring is complete.

The unit is designed for use with or without duct work.
Flanges are provided for attaching the supply and return
air ducts.

These instructions explain the recommended method to
install the air cooled self-contained unit and the electrical
wiring connections to the unit.

These instructions and any instructions packaged with
any separate equipment required to make up the entire
air conditioning system should be carefully read before
beginning the installation. Note particularly “Starting
Procedure” and any tags and/or labels attached to the
equipment.

While these instructions are intended as a general
recommended guide, they do not supersede any national
and/or local codes in any way. Authorities having
jurisdiction should be consulted before the installation
is made. See Page 3 for information on codes and
standards.

Size of unit for a proposed installation should be based
on heat loss/gain calculation made according to methods
of Air Conditioning Contractors of America (ACCA).
The air duct should be installed in accordance with the
Standards of the National Fire Protection Association
for the Installation of Air Conditioning and Ventilating
Systems of Other Than Residence Type, NFPA No.
90A, and Residence Type Warm Air Heating and Air
Conditioning Systems, NFPA No. 90B. Where local
regulations are at a variance with instructions, installer
should adhere to local codes.

Manual 2100-618
Page 6 of 21

DUCT WORK

FRESH AIR INTAKE

All duct work, supply and return must be properly sized

for the design air ow requirement of the equipment.

Air Conditioning Contractors of America (ACCA) is
an excellent guide to proper sizing. All duct work or
portions thereof not in the conditioned space should be
properly insulated in order to both conserve energy and
prevent condensation or moisture damage.

Refer to Table 8 for maximum static pressure available
for duct design.

Design the duct work according to methods given by
the Air Conditioning Contractors of America (ACCA).
When duct runs through unheated spaces, it should be
insulated with a minimum of one inch of insulation.
Use insulation with a vapor barrier on the outside of the
insulation. Flexible joints should be used to connect the
duct work to the equipment in order to keep the noise
transmission to a minimum.

Ducts through the walls must be insulated and all joints
taped or sealed to prevent air or moisture entering the
wall cavity.

Some installations may not require any return air duct.
It is recommended that on this type of installation that

a lter grille be located in the wall. Filters must be of
sufcient size to allow a maximum velocity of 400 FPM.

NOTE: If no return air duct is used, applicable

installation codes may limit this cabinet to
installation only in a single story structure.

All units are built with fresh air inlet slots punched in the
service panel.

If the unit is equipped with a fresh air damper assembly,
the assembly is shipped already attached to the unit. The
damper blade is locked in the closed position. To allow
the damper to operate, the maximum and minimum blade
position stops must be installed. See Figure 2.

All capacity, efciency and cost of operation information

as required for Department of Energy “Energyguide”
Fact Sheets is based upon the fresh air blank-off plate
in place and is recommended for maximum energy

efciency.

The blank-off plate is available upon request from the
factory and is installed in place of the fresh air damper
shipped with each unit.

CONDENSATE DRAIN

A plastic drain hose extends from the drain pan at the top
of the unit down to the unit base. There are openings in
the unit base for the drain hose to pass through. In the
event the drain hose is connected to a drain system of
some type, it must be an open or vented type system to
assure proper drainage.

FIGURE 2

FRESH AIR DAMPER

FILTERS

A one inch throwaway lter is supplied with each unit.
The lter slides into position making it easy to service.
This lter can be serviced from the outside by removing
the service door. A 2-inch pleated lter is also available
as an optional accessory. The internal lter brackets are
adjustable to accommodate the 2-inch lter by bending
the metal tabs holding the 1-inch lter down. There are
two tabs on each side of the lter.

Manual 2100-618
Page 7 of 21

INSTALLATION INSTRUCTIONS

WALL MOUNTING INFORMATION

1. These units are secured by wall mounting brackets
which secure the unit to the outside wall surface at
both sides.

2. On wood frame walls, the wall construction must be
strong and rigid enough to carry the weight of the
unit without transmitting any unit vibration.

3. Concrete block walls must be thoroughly inspected
to insure that they are capable of carrying the weight
of the installed unit.

MOUNTING THE UNIT

1. Two holes, for the supply and return air openings,
must be cut through the wall as shown in Figure 3.

2. Locate and mark lag bolt locations, if desired. See
Figure 3.

3. Hook top rain ashing under back bend of top. Top
rain ashing is shipped attached to the back of the

unit on the right side.

4. Position unit in opening and secure with 5/16 lag

bolts; use 7/8 inch diameter at washers on the lag

bolts.

5. Secure rain ashing to wall and caulk across entire

length of top. See Figure 3.

6. For additional mounting rigidity, the return air
and supply air frames or collars can be drilled
and screwed or welded to the structural wall itself
(depending upon wall construction). Be sure to
observe required clearance if combustible wall.

7. On side-by-side installations, maintain a minimum
of 20 inches clearance on right side to allow access

to control panel and allow proper airow to outdoor

coil. Additional clearance may be required to meet
local or national codes.

Manual 2100-618
Page 8 of 21

FIGURE 3

MOUNTING INSTRUCTIONS

2.500

19.719

19.719

7.031

17.000

17.0006.969

SEAL WITH BEAD OF CAULKING
ALONG ENTIRE LENGTH OF TOP.

TOP

WALL

7.031

5.000

10.000

5.000

RAIN FLASHING
SUPPLIED

FOAM AIR SEAL

WALL STRUCTURE

SUPPLY AIR DUCT

RETURN AIR
OPENING

WALL OPENING AND HOLE

LOCATION VIEW

NOTE:
IT IS RECOMMENDED THAT A BEAD OF SILI CONE
CAULKING BE PLACED BEHIND THE SIDE MOUNTI NG
FLANGES AND UNDER TOP FLASHING AT TIME OF
INSTALLATION.

MIS-3600

Manual 2100-618
Page 9 of 21

FIGURE 4

WALL MOUNTING INSTRUCTIONS

SEE FIGURE 3 - MOUNTING INSTRUCTIONS

FIGURE 5

WALL MOUNTING INSTRUCTIONS

SEE UNIT DIMENSIONS, FIGURE 1,
FOR ACTUAL DIMENSIONS

Manual 2100-618
Page 10 of 21

FIGURE 6

COMMON WALL MOUNTING INSTALLATIONS

Manual 2100-618
Page 11 of 21

WIRING – MAIN POWER

WIRING – LOW VOLTAGE WIRING

Refer to the unit rating plate for wire sizing information
and maximum fuse or “HACR” type circuit breaker size.
Each outdoor unit is marked with a “Minimum Circuit

Ampacity”. This means that the eld wiring used must

be sized to carry that amount of current. Depending
on the installed KW of electric heat, there may be two

eld power circuits required. If this is the case, the unit

serial plate will so indicate. All models are suitable
only for connection with copper wire. Each unit and/or
wiring diagram will be marked “Use Copper Conductors
Only”. These instructions must be adhered to. Refer to
the National Electrical Code (NEC) for complete current
carrying capacity data on the various insulation grades of
wiring material. All wiring must conform to NEC and all
local codes.

The electrical data lists fuse and wire sizes (75°C copper)
for all models, including the most commonly used heater

sizes. Also shown are the number of eld power circuits

required for the various models with heaters.
The unit rating plate lists a “Maximum Time Delay Relay

Fuse” of “HACR” type circuit breaker that is to be used
with the equipment. The correct size must be used for
proper circuit protection and also to assure that there
will be no nuisance tripping due to the momentary high
starting current of the compressor motor.

See Table 2 for electrical specications.

230/208, 1 phase equipment use dual primary voltage
transformers. All equipment leaves the factory wired on
240V tap. For 208V operation, reconnect from 240V to
208V tap. The acceptable operating voltage range for the
240 and 208V taps are:

Tap Range

240 253 - 216
208 220 - 187

NOTE: The voltage should be measured at the eld

power connection point in the unit and while the
unit is operating at full load (maximum amperage
operating condition).

An 18 gauge copper, color-coded thermostat cable is
recommended. The connection points are shown in this
Manual. See Table below.

TABLE 3

WALL THERMOSTAT

Part Number Predominate Features

8403-057

(TH3110D1040)

8403-058

(TH5220D1151)

8403-060

(1120-445)

1 stage Cool, 1 stage Heat
Electronic Non-Programmable
Auto or Manual changeover

2 stage Cool, 2 stage Heat
Electronic Non-Programmable
HP or Conventional
Auto or Manual changeover

3 stage Cool; 3 stage Heat
Programmable/
Non-Programmable Electronic
HP or Conventional
Auto or Manual changeover

Dehumidication Output

Manual 2100-618
Page 12 of 21

Transformer

VA

55 2.3

TABLE 4

THERMOSTAT WIRE SIZE

FLA Wire Gauge

20 gauge
18 gauge
16 gauge
14 gauge
12 gauge

Maximum

Distance

In Feet

45

60
100
160
250

Low Voltage Connection

These units use a 24-volt AC low voltage circuit. The “R” terminal is the hot terminal and the “C” terminal is grounded.
“G” terminal is the fan input.
“Y” terminal is the compressor input for cooling 1-Stage units only or 2-Stage units with ECONWM*
“Pink Wire” is 2nd Stage cooling 2-Stage units only with ECONWM*
“Y1” terminal is the 1st Stage compressor input for cooling 2-Stage units only — No ECONWM*
“Y2” terminal is the 2nd Stage compressor input for cooling 2-Stage units only — No ECONWM*
“W1” terminal is the 1st stage electric heat.
“W2” terminal is the 2nd stage heat (if equipped).
“A”, “E”, “F” terminals are the ventilation inputs. See Figures 8-10 for detailed diagrams.

NOTE: On models with “J” Control Module, Terminals 1, 2 and 3 are used for the alarm relay.

FIGURE 7

LOW VOLTAGE WIRING

BASIC A/C WITH OPTIONAL ELECTRIC HEAT

NO ECONOMIZER OR VENTILATION PACKAGES

Manual 2100-618
Page 13 of 21

4

8403-060
THERMOSTAT

FIGURE 8

LOW VOLTAGE WIRING

A/C WITH PROGRAMMABLE THERMOSTAT

LOW VOLTAGE WIRING

AC WITH PROGRAMMABLE THERMOSTAT

C

GR Y1 W2

W1/E

YO/D

Y2

LO/B

ELECTRONIC

A

PROGRAMABLE

UNIT 24V
TERMINAL BLOCK

RED

BLACK

2

1

3 4 5

3

C R G 1 2 3

Y W1 W2 Y1

Y2

1

CRV

BROWN/WHITE

OPTIONAL
VENT PACKAGE

REMOVE JUMPER FOR 2 STAGE ELECTRIC HEAT ON UNITS

1

WITH 15 OR MORE KW

YELLOW/RED

OPTIONAL 8403-067

6

CO2 CONTROLLER

FE

MIS-3597

2

A

Manual 2100-618
Page 14 of 21

DO NOT CONNECT "A" FROM 8403-060 IF OPTIONAL CO2

2

CONTROLLER IS USED

ADD JUMPER FROM "G" TO "E" ONLY IF OPTIONAL CO2 CONTROLLER IS INSTALLED

3

CHANGE MODEL CONFIGURATION FROM HEAT PUMP TO HEAT/COOL.

4

MUST BE CONFIGURED TO PROGRAMMABLE AND FAN SET TO PROGRAMMED
FAN FOR THE "A" OUTPUT TO FUNCTION DURING SCHEDULED OCCUPIED PERIODS.

MIS-3597

LOW VOLTAGE WIRING

AC WITH NON-PROGRAMMABLE THERMOSTAT

FIGURE 9

LOW VOLTAGE WIRING

A/C WITH NON-PROGRAMMABLE THERMOSTAT

8403-057

(TH3110D1040)

4

8403-058

(TH5220D1151)

UNIT 24V
TERMINAL BLOCK

RED

BLACK

Rc

2

Rc

R G Y

G Y

R

R G

CRV

C

C

2

C

W

O

W2 Y2

W

Y W1 W2 Y1 Y2

OPTIONAL
VENT PACKAGE

REMOVE JUMPERFOR 2 STAGEELECTRIC HEAT ON UNITS

1

WITH 15OR MORE KW

1 STAGE COOL

B

1 STAGE HEAT
THERMOSTAT

2 STAGE COOL
2 STAGE HEAT
THERMOSTAT

YELLOW/RED

1 2 3 E F

31

BROWN/WHITE

2

1

3 4 5 6

5

A

OPTIONAL 8403-067
CO2 CONTROLLER

FACTORY INSTALLED JUMPER

2

ADD JUMPER IFOPTIONAL CO2 CONTROLLER IS NOT USED,

3

VENT WILLRUN WHILE BLOWER IS ENERGIZED.DO NOT
INSTALL JUMPER IF OPTIONALCO2 CONTROLLER INSTALLED,
AND SEENOTE 6.

CHANGE "SYSTEMTYPE", SET UP FUNCTION 1, FROM 5 (2 HEAT/ 1 COOL HEATPUMP)

4

TO 6 (2HEAT/ 2 COOLCONVENTIONAL).

5

ADD JUMPERFROM "G" TO"E" ONLY IF
OPTIONAL CO2CONTROLLER IS I NSTALLED

MIS-3598

Manual 2100-618
Page 15 of 21

Low Voltage Wiring Diagram

4

8403-058

(TH5220D1151)

5

Thermostat

part #8403-060

LOW VOLTAGE WIRING

1-STAGE A/C WITH OPTIONAL ELECTRIC HEAT

WITH ECONWM STYLE ECONOMIZER

3

Y

C

R RC

G W2

Y2

Y2

YO/D

RGC

Y1

FIGURE 10

W

W1/E

W2

2

A

O/B

L

A/C UNIT

24V TERMINALS

C G R

BLACK

Economizer

Wiring Harness

Must be energized to enable minimum position. NOTE: Economizer Control Default Setting

2

is 10V (100%). Depending upon application may require setting to lower value.
Factory Jumper Installed.

3

Change "system type", set up function 1, from 5 (2 heat/ 1 cool heat pump)

4

to 6 (2 heat/ 2 cool conventional).
Change model configuration from heat pump to heat/cool, and must be configured for

5

economizer for YO/D output to be active as first stage cooling.

RED

Y

YELLOW

Y1

PURPLE

Y2

W1

PINK

BLUE

BROWN/WHITE

W2

3

2

1

EA

F

2

YELLOW/RED

Manual 2100-618
Page 16 of 21

MIS-3593

START UP

THESE UNITS REQUIRE R-410A
REFRIGERANT AND POL YOL
ESTER OIL.

GENERAL:

1. Use separate service equipment to avoid cross
contamination of oil and refrigerants.

2. Use recovery equipment rated for R-410A
refrigerant.

3. Use manifold gauges rated for R-410A (800 psi/250
psi low).

4. R-410A is a binary blend of HFC-32 and HFC-125.

5. R-410A is nearly azeotropic - similar to R-22 and
R-12. Although nearly azeotropic, charge with
liquid refrigerant.

6. R-410A operates at 40-70% higher pressure than
R-22, and systems designed for R-22 cannot
withstand this higher pressure.

7. R-410A has an ozone depletion potential of zero,
but must be reclaimed due to its global warming
potential.

8. R-410A compressors use Polyol Ester oil.

9. Polyol Ester oil is hygroscopic; it will rapidly absorb
moisture and strongly hold this moisture in the oil.

10. A liquid line dryer must be used - even a deep
vacuum will not separate moisture from the oil.

11. Limit atmospheric exposure to 15 minutes.

12. If compressor removal is necessary, always plug
compressor immediately after removal. Purge with
small amount of nitrogen when inserting plugs.

TOPPING OFF SYSTEM CHARGE

If a leak has occurred in the system, Bard Manufacturing
recommends reclaiming, evacuating (see criteria above),
and charging to the nameplate charge. If done correctly,
topping off the system charge can be done without
problems.

With R-410A, there are no signicant changes in the

refrigerant composition during multiple leaks and
recharges. R-410A refrigerant is close to being an
azeotropic blend (it behaves like a pure compound
or single component refrigerant). The remaining
refrigerant charge, in the system, may be used after leaks
have occurred and then “top-off” the charge by utilizing
the pressure charts on the inner control panel cover as a
guideline.

REMEMBER: When adding R-410A refrigerant, it must
come out of the charging cylinder/tank as a liquid to
avoid any fractionation, and to insure optimal system
performance. Refer to instructions for the cylinder that
is being utilized for proper method of liquid extraction.

WARNING

Failure to conform to these practices
could lead to damage, injury or death.

SAFETY PRACTICES:

1. Never mix R-410A with other refrigerants.

2. Use gloves and safety glasses, Polyol Ester oils can
be irritating to the skin, and liquid refrigerant will
freeze the skin.

3. Never use air and R-410A to leak check; the

mixture may become ammable.

4. Do not inhale R-410A – the vapor attacks the
nervous system, creating dizziness, loss of
coordination and slurred speech. Cardiac
irregularities, unconsciousness and ultimate death
can result from breathing this concentration.

5. Do not burn R-410A. This decomposition
produces hazardous vapors. Evacuate the area if
exposed.

6. Use only cylinders rated DOT4BA/4BW 400.

7. Never ll cylinders over 80% of total capacity.

8. Store cylinders in a cool area, out of direct
sunlight.

9. Never heat cylinders above 125°F.

10. Never trap liquid R-410A in manifold sets, gauge

lines or cylinders. R-410A expands signicantly at

warmer temperatures. Once a cylinder or line is full
of liquid, any further rise in temperature will
cause it to burst.

Manual 2100-618
Page 17 of 21

START UP

IMPORTANT INSTALLER NOTE

For improved start up performance, wash the indoor coil
with a dishwasher detergent.

SERVICE HINTS

1. Caution owner to maintain clean air lters at all

times. Also not to needlessly close off supply and

return air registers. This reduces airow through the

system which shortens equipment service life as well
as increasing operation costs.

2. The unit is equipped with a high pressure cut out
switch.

3. Check all power fuses or circuit breakers to be sure
they are the correct rating.

4. Periodic cleaning of the outdoor coil to permit full

and unrestricted airow circulation is essential.

HIGH and LOW PRESSURE SWITCH

The W12AAA models are supplied with a remote reset
high and low pressure switch. If tripped, this pressure
switch may be reset by turning the thermostat off then
back on again.

SEQUENCE OF OPERATION

HEATING – Circuit R-Y makes at thermostat pulling
in compressor contactor, starting the compressor
and outdoor motor. The G (indoor motor) circuit
is automatically completed on any call for cooling
operation or can be energized by manual fan switch
on subbase for constant air circulation. On a call for
heating, circuit R-W1 make at the thermostat pulling in
heat contact for the strip heat and blower operation.

COMPRESSOR CONTROL MODULE

The compressor control is an anti-short cycle/lockout
timer with high and low pressure switch monitoring and
alarm relay output.

During routine operation of the unit with no power
interruptions the compressor will operate on demand
with no delay.

High Pressure Switch and Lockout Sequence

If the high pressure switch opens, the compressor
contactor will de-energize immediately. The lockout
timer will go into a soft lockout and stay in soft lockout
until the high pressure switch closes and the delay on
break time has expired. If the high pressure switch opens
again in this same operating cycle the unit will go into
manual lockout condition and the alarm relay circuit
will energize. Recycling the wall thermostat resets the
manual lockout.

Low Pressure Switch, Bypass and Lockout
Sequence

If the low pressure switch opens for more than 120
seconds, the compressor contactor will de-energize
and go into a soft lockout. Regardless the state of the
low pressure switch, the contactor will reenergize after
the delay on make time delay has expired. If the low
pressure switch remains open, or opens again for longer
that 120 seconds, the unit will go into manual lockout
condition and the alarm relay circuit will energize.
Recycling the wall thermostat resets the manual lockout.

Alarm Relay Output

Alarm terminal is output connection for applications
where alarm relay is employed. This terminal is powered
whenever compressor is locked out due to HPC or LPC
sequences as described.

NOTE: Both high and low pressure switch controls

are inherently automatic reset devices. The
high pressure switch and low pressure switch

cut out and cut in settings are xed by specic

air conditioner or heat pump unit model. The
lockout features, both soft and manual, are a
function of the Compressor Control Module.

Adjustable Delay on Make and Break Timer

On initial power up or any time power is interrupted to
the unit the delay on make period begins, which will be
2 minutes plus 10% of the delay on break setting. When
the delay on make is complete and the high pressure
switch (and low pressure switch if employed) is closed,
the compressor contactor is energized. Upon shutdown
the delay on break time starts and prevents restart until
the delay on break and delay on make periods have
expired.

Manual 2100-618
Page 18 of 21

ADJUSTMENTS

PRESSURE SERVICE PORTS

Adjustable Delay on Make and Delay on Break
Timer

The potentiometer is used to select Delay on Break time
from 30 seconds to 5 minutes. Delay of Make (DOM)
timing on power up and after power interruptions is equal
to 2 minutes plus 10% of Delay of Break (DOB) setting:

0.5 minute (30 seconds) DOB = 123 second DOM

1.0 minute (60 seconds) DOB = 126 second DOM

2.0 minute (120 seconds) DOB = 132 second DOM

3.0 minute (180 seconds) DOB = 138 second DOM

4.0 minute (240 seconds) DOB = 144 second DOM

5.0 minute (300 seconds) DOB = 150 second DOM
During routine operation of the unit with no power

interruptions the compressor will operate on demand
with no delay.

Typical Settings for Dual Unit Installation:

Unit No. 1: DOB set at 2 minutes, and DOM is 132
seconds.

Unit No. 2: DOB set at 4 minutes, and DOM is 144
seconds.

High and low pressure service ports are installed on
all units so that the system operating pressures can be
observed. Pressure chart can be found later in the manual
covering all models. It is imperative to match the correct
pressure chart to the unit by model number.

Manual 2100-618
Page 19 of 21

TROUBLESHOOTING

FAN BLADE SETTING DIMENSIONS

Shown in Figure 7 is the correct fan blade setting
dimension for proper air delivery across the outdoor coil.

Any service work requiring removal or adjustment in
the fan and/or motor area will require that the dimension
below be checked and blade adjusted in or out on the
motor shaft accordingly.

FIGURE 11

FAN BLADE SETTING DIMENSION

AIRFLOW

"A"

MIS-1724

TABLE 6

INDOOR BLOWER PERFORMANCE

E.S.P.

in

H2O

.0
.1
.2
.3
.4

RECOMMENDED AIRFLOW RANGE

Model

W12AAA 400 .10 475 - 300

230V/115V-60Hz 240V-50Hz

Dry / Wet Dry / Wet

475 / 450
425 / 400
375 / 360
315 / 300
270 / 250

TABLE 7

RATED CFM AND ESP

Rated

CFM

Rated

ESP

W12AAA

395 / 375
355 / 330
310 / 300
260 / 250
225 / 210

Recommended

Airow Range

TABLE 5

FAN BLADE DIMENSION

Model Dimension A

W12AAA 2.25"

R-410A

REFRIGERANT CHARGE

This unit was charged at the factory with the quantity of
refrigerant listed on the serial plate. AHRI capacity and

efciency ratings were determined by testing with this

refrigerant charge quantity.
The following pressure tables show nominal pressures for

the units. Since many installation specic situations can

affect the pressure readings, this information should only

be used by certied technicians as a guide for evaluating

proper system performance. They shall not be used to
adjust charge. If charge is in doubt, reclaim, evacuate
and recharge the unit to the serial plate charge.

TABLE 8

MAXIMUM ESP OF OPERATION

ELECTRIC HEAT ONLY

Model ESP

W12AAAA00

A03
A05

W12AAAK00

K02

W12AAAD00

D03

Values shown are for units equipped with

STD 1" throwaway lters. Derate ESP
by .15 for 2" pleated lters.

.35
.35
.35

.35
.35

.35
.35

Manual 2100-618
Page 20 of 21

TABLE 9

PRESSURE TABLE

COOLING

Model

Return Air

Temperature

75 deg. DB

62 deg. WB

W12AAAA
W12AAAK

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

75 deg. DB

62 deg. WB

W12AAAD

80 deg. DB

67 deg. WB

85 deg. DB

72 deg. WB

Low Side Pressure +4 PSIG
High Side Pressure +10 PSIG

Air Temperature Entering Outdoor Coil °F

Pressure 75° 80° 85° 90° 95° 100° 105° 100° 115° 120°

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

Low Side

High Side

125
296

134
304

139
315

125
314

134
322

139
333

129
316

138
324

143
335

129
334

138
343

143
355

132
336

141
345

146
357

132
357

141
366

146
379

134
359

143
368

148
381

134
380

143
390

148
404

137
381

146
391

151
405

137
404

146
414

151
428

139
405

149
415

154
430

139
429

149
440

154
455

141
429

151
440

156
455

141
454

151
466

156
482

144
454

154
466

159
482

144
482

154
494

159
511

146
481

156
493

161
510

146
510

156
523

161
541

148
508

158
521

164
539

148
538

158
552

164
571

TABLE 10

OPTIONAL FIELD INSTALLED ACCESSORIES

Model Description

BOP-1A Blank Off Plate X
BFAD-1 Barometric Fresh Air Damper X
JIFM-1A Economizer with Exhaust X
CMA-28 Low Ambient Control X
CRVS-1A Commercial Ventilator - Spring Return X

W12AAA

Manual 2100-618
Page 21 of 21