Ameristar M4AC6 Assembly instructions

Installer’s Guide
April 2020
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating,
and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or
altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all pre-
cautions in the literature and on the tags, stickers, and labels that are attached to the equipment.
M4AC6018A1000A
M4AC6024A1000A
M4AC6030A1000A
M4AC6036A1000A
M4AC6042A1000A
M4AC6048A1000A
Note: “Graphics in this document are for representation only.
Actual model may differ in appearance.”
Split System Cooling
M4AC6
88-M4PW003-1B-EN

2 88-M4PW003-1B-EN
s
s
WARNING
This information is intended for use by individuals possessing
adequate backgrounds of electrical and mechanical experience.
Any attempt to repair a central air conditioning product may result in
personal injury and/or property damage. The manufacture or seller
cannot be responsible for the interpretation of this information, nor
can it assume any liability in connection with its use.
These units use R-410A refrigerant which operates at 50 to 70%
higher pressures than R-22. Use only R-410A approved service
equipment. Refrigerant cylinders are painted a “Rose” color to
indicate the type of refrigerant and may contain a “dip” tube to allow
for charging of liquid refrigerant into the system. All R-410A systems
use a POE oil that readily absorbs moisture from the atmosphere.
To limit this “hygroscopic” action, the system should remain sealed
whenever possible. If a system has been open to the atmosphere
for more than 4 hours, the compressor oil must be replaced. Never
break a vacuum with air and always change the driers when open-
ing the system for component replacement. For specific handling
concerns with R-410A and POE oil reference Retrofit Bulletins SS-
APG006-EN and APP-APG011-EN.
Extreme caution should be exercised when opening the
Liquid Line Service Valve. Turn counterclockwise until
the valve stem just touches the rolled edge. No torque is
required. Failure to follow this warning will result in abrupt
release of system charge and may result in personal injury
and /or property damage.
UNIT CONTAINS R-410A REFRIGERANT!
R-410A operating pressures exceed the limit of R-22. Proper ser-
vice equipment is required. Failure to use proper service tools may
result in equipment damage or personal injury.
USE ONLY R-410A REFRIGERANT AND APPROVED POE COM-
PRESSOR OIL.
s
s
WARNING
s
s
WARNING
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and troubleshooting of
this product, it may be necessary to work with live electrical
components. Failure to follow all electrical safety precau-
tions when exposed to live electrical components could
result in death or serious injury.
s
s
WARNING
The appliance is not to be used by persons (including
children) with reduced physical, sensory or mental capabili-
ties, or lack of experience and knowledge, unless they have
been given supervision or instruction.
s
s
WARNING
Children should be supervised to ensure that they do
not play with the appliance.
s
s
WARNING
If using existing refrigerant lines make certain that all
joints are brazed, not soldered.
CAUTION
Scroll compressor dome temperatures may be hot. Do
not touch the top of compressor; it may cause minor
to severe burning.
CAUTION
s
s
WARNING
IMPORTANT — This Document is customer property and is to
remain with this unit. Please return to service information pack
upon completion of work.
These instructions do not cover all variations in systems, nor
do they provide for every possible contingency to be met in
connection with the installation. Should further information
be desired, or should particular problems arise which are not
sufficiently covered for the purchaser’s purposes, the matter
should be referred to your installing dealer or local distributor.
Table of Contents
Section 1. Safety...........................................................................................................................................................2
Section 2. Unit Location Considerations.......................................................................................................................3
Section 3. Unit Preparation...........................................................................................................................................4
Section 4. Setting the Unit.............................................................................................................................................5
Section 5. Refrigerant Line Considerations...................................................................................................................5
Section 6. Refrigerant Line Routing...............................................................................................................................6
Section 7. Refrigerant Line Brazing...............................................................................................................................7
Section 8. Refrigerant Line Leak Check........................................................................................................................9
Section 9. Evacuation....................................................................................................................................................9
Section 10. Service Valves...........................................................................................................................................10
Section 11. Electrical - Low Voltage.............................................................................................................................10
Section 12. Electrical - High Voltage.............................................................................................................................12
Section 13. Start Up......................................................................................................................................................12
Section 14. System Charge Adjustment.......................................................................................................................13
Section 15. Checkout Procedures and Troubleshooting...............................................................................................17
Section 16. Refrigeration Circuits..................................................................................................................................21
ALL phases of this installation must comply with NATIONAL,
STATE AND LOCAL CODES
Section 1. Safety

88-M4PW003-1B-EN 3
D
H
W
50’
Max
Vertical
Change
Standard
Line Set
150’ Max
TOTAL Line Length
50’
Max
Vertical
Change
Table 2.1
Section 2. Unit Location Considerations
2.1 Unit Dimensions and Weight
2.2 Refrigerant Piping Limits
1. The maximum TOTAL length of refriger-
ant lines from outdoor to indoor unit should
NOT exceed 150 feet (including lift).
2. The maximum vertical change should not
exceed 50 feet.
3. Service valve connection diameters are
shown in Table 5.1.
Note: For other line lengths, Refer to Refriger-
ant Piping Application Guide, SS-APG006-EN
or Refrigerant Piping Software Program, 32-
3312-03 (or latest revision).
When mounting the outdoor unit on a roof, be
sure the roof will support the unit’s weight.
Properly selected isolation is recommended to
alleviate sound or vibration transmission to the
building structure.
Unit Dimensions and Weight
Models H x D x W (in) Weight* (lb)
M4AC6018A
29 x 30 x 33 161
M4AC6024A
29 x 30 x 33 162
M4AC6030A
42 x 30 x 37 184
M4AC6036A
37 x 34 x 37 212
M4AC6042A
45 x 34 x 37 272
M4AC6048A
45 x 34 x 37 272
* Weight values are estimated.

4 88-M4PW003-1B-EN
Min. 12” to
Shrubbery
Avoid Install
Near Bedrooms
Min 5’ Unrestricted
Access Panel
Min 3’
Unrestricted
2.3 Suggested Locations for Best Reliability
Ensure the top discharge area is unrestricted for
at least five (5) feet above the unit.
Three (3) feet clearance must be provided in
front of the control box (access panels) and any
other side requiring service.
Do not locate close to bedrooms as operational
sounds may be objectionable.
Min. 12” to
Shrubbery
Min. 12”
to Wall
Position the outdoor unit a minimum of 12” from
any wall or surrounding shrubbery to ensure
adequate airflow.
Outdoor unit location must be far enough away
from any structure to prevent excess roof runoff
water from pouring directly on the unit.
STEP 2 - To remove the unit from the pallet,
remove tabs by cutting with a sharp tool.
Section 3. Unit Preparation
3.1 Prepare The Unit For Installation
STEP 1 - Check for damage and report prompt-
ly to the carrier any damage found to the unit.
2.4 Coastal Considerations
If installed within one mile of salt water, including seacoasts and inland waterways, models without factory sup-
plied Seacoast Salt Shields require the addition of BAYSEAC001 (Seacoast Kit) at installation time.

88-M4PW003-1B-EN 5
Section 4. Setting the Unit
4.1 Pad Installation
When installing the unit on a support pad, such
as a concrete slab, consider the following:
• The pad should be at least 1” larger than the
unit on all sides.
• The pad must be separate from any structure.
• The pad must be level.
• The pad should be high enough above grade
to allow for drainage.
• The pad location must comply with National,
State, and Local codes.
Line Sizes Service Valve Connection Sizes
Model Vapor
Line
Liquid
Line
Vapor Line
Connection
Liquid Line
Connection
M4AC6018A 3/4 3/8 3/4 3/8
M4AC6024A 3/4 3/8 3/4 3/8
M4AC6030A 3/4 3/8 3/4 3/8
M4AC6036A 7/8 3/8 3/4 3/8
M4AC6042A 7/8 3/8 3/4 3/8
M4AC6048A 7/8 3/8 3/4 3/8
Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes
Table 5.1
Line Length
5.3 Required Refrigerant Line Length
5.2 Factory Charge
Determine required line length and lift. You will
need this later in STEP 2 of Section 14.
Total Line Length = __________ Ft.
Total Vertical Change (lift) = __________ Ft.
The outdoor condensing units are factory charged with the system charge required for the outdoor condensing
unit, ten (10) feet of tested connecting line, and the smallest rated indoor evaporative coil match. Always verify
proper system charge via subcooling (TXV/EEV) or superheat (xed orice) per the unit nameplate.

6 88-M4PW003-1B-EN
5.5 Reuse Existing Refrigerant Lines
For retrofit applications, where the existing
indoor evaporator coil and/or refrigerant lines
will be used, the following precautions should
be taken:
• Ensure that the indoor evaporator coil and
refrigerant lines are the correct size.
• Ensure that the refrigerant lines are free of
leaks, acid, and oil.
CAUTION
If using existing refrigerant lines make certain that
all joints are brazed, not soldered.
Section 6. Refrigerant Line Routing
6.1 Precautions
Important: Take precautions to prevent noise
within the building structure due to vibration
transmission from the refrigerant lines.
For Example:
• When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation type
hangers.
• Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings.
• Where the refrigerant lines run through a wall or sill, they should be insulated and isolated.
• Isolate the lines from all ductwork.
• Minimize the number of 90º turns.
Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.
Isolation From Joist/Rafter
Side View
8 Feet Maximum
Secure Vapor line from joists using isolators every 8 ft. Secure
Liquid Line directly to Vapor line using tape, wire, or other appro-
priate method every 8 ft.
Joist/Rafter
Isolator
Line Set
8 Feet Maximum
5.4 Refrigerant Line Insulation
Important: The Vapor Line must always be
insulated. DO NOT allow the Liquid Line and
Vapor Line to come in direct (metal to metal)
contact.
Vapor Line
Liquid Line
Insulation

88-M4PW003-1B-EN 7
Isolation In Wall Spaces
Side View
Wall
Isolator
Line Set
8 Feet Maximum
Secure Vapor Line using isolators every 8 ft. Secure Liquid Line
directly to Vapor Line using tape, wire, or other appropriate
method every 8 ft.
8 Feet Maximum
Isolation Through Wall DO NOT hang line sets from ductwork
Sealant
Insulation
Vapor Line
Wall
Ductwork
Isolator
Line Set
Section 7. Refrigerant Line Brazing
7.1 Braze The Refrigerant Lines
STEP 1 - Remove caps or plugs. Use a debur-
ing tool to debur the pipe ends. Clean both
internal and external surfaces of the tubing
using an emery cloth.

8 88-M4PW003-1B-EN
STEP 2 - Remove the pressure tap cap and
valve cores from both service valves.
STEP 3 - Purge the refrigerant lines and indoor
coil with dry nitrogen.
STEP 4 - Wrap a wet rag around the valve body
to avoid heat damage and continue the dry nitro-
gen purge.
Braze the refrigerant lines to the service valves.
For units shipped with a field-installed external
drier, check liquid line filter drier’s directional flow
arrow to confirm correct direction of refrigeration
flow (away from outdoor unit and toward evapo-
rator coil) as illustrated. Braze the filter drier to
the Liquid Line.
Continue the dry nitrogen purge. Do not remove
the wet rag until all brazing is completed.
Important: Remove the wet rag before stopping
the dry nitrogen purge.
Note: Install drier in Liquid Line.
NOTE:NOTE: Precautions should be taken to avoidPrecautions should be taken to avoid
heat damage to basepan during brazing. It isheat damage to basepan during brazing. It is
recommended to keep the flame directly off ofrecommended to keep the flame directly off of
the basepan.the basepan.
3-4” from valve

88-M4PW003-1B-EN 9
STEP 5 - Replace the pressure tap valve cores
after the service valves have cooled.
STEP 2 - Check for leaks by using a soapy solu-
tion or bubbles at each brazed location.
Remove nitrogren pressure and repair any leaks
before continuing.
Section 8. Refrigerant Line Leak Check
8.1 Check For Leaks
STEP 1 - Pressurize the refrigerant lines and
evaporator coil to 150 PSIG using dry nitrogen.
150 PSIG
Section 9. Evacuation
9.1 Evacuate the Refrigerant Lines and Indoor Coil
Important: Do not open the service valves until
the refrigerant lines and indoor coil leak check
and evacuation are complete.
STEP 1 - Evacuate until the micron gauge reads
no higher than 350 microns, then close off the
valve to the vacuum pump.
0350
Microns
ON OFF

10 88-M4PW003-1B-EN
STEP 2 - Observe the micron gauge. Evacuation
is complete if the micron gauge does not rise
above 500 microns in one (1) minute.
Once evacuation is complete blank off the
vacuum pump and micron gauge, and close the
valves on the manifold gauge set.
1 MIN.
Section 10. Service Valves
10.1 Open the Gas Service Valve
CAP
1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION
VALVE STEM
GAS LINE CONNECTION
UNIT SIDE
OF VALVE
PRESSURE TAP PORT
Important: Leak check and evacuation must be
completed before opening the service valves.
NOTE: Do not vent refrigerant gases into the
atmosphere
STEP 1 - Remove valve stem cap.
STEP 2 - Using an adjustable wrench, turn valve
stem 1/4 turn counterclockwise to the fully open
position.
STEP 3 - Replace the valve stem cap to prevent
leaks. Tighten finger tight plus an additional 1/6
turn.
10.1 Open the Liquid Service Valve
Important: Leak check and evacuation must be
completed before opening the service valves.
STEP 1 - Remove service valve cap.
STEP 2 - Fully insert 3/16” hex wrench into the
stem and back out counterclockwise until valve
stem just touches the rolled edge (approximately
five (5) turns.)
STEP 3 - Replace the valve cap to prevent
leaks. Tighten finger tight plus an additional 1/6
turn.
Cap
Rolled Edge to
Captivate Stem
Hex Headed
Valve System
Service Port
3/16” Hex Wrench
Unit Side
of Service
Valve
Extreme caution should be exercised when
opening the Liquid Line Service Valve. Turn
counterclockwise until the valve stem just
touches the rolled edge. No torque is required.
Failure to follow this warning will result in abrupt
release of system charge and may result in
personal injury and /or property damage.
s
s
WARNING
Section 11. Electrical - Low Voltage
11.1 Low Voltage Maximum Wire Length
Table 11.1 defines the maximum total length of
low voltage wiring from the outdoor unit, to the
indoor unit, and to the thermostat.
Table 11.1
24 VOLTS
WIRE SIZE MAX. WIRE LENGTH
18 AWG 150 Ft.
16 AWG 225 Ft.
14 AWG 300 Ft.

88-M4PW003-1B-EN 11
11.2 Low Voltage Hook-up Diagrams
With M4AC6
• Units with pigtails require wirenuts for connections. Cap all unused wires.
•
In AC systems for multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat.
** When using a BK enabled comfort control, cut BK jumper and bypass Y1 and Y2 at the air handle
r. Connect BK from comfort control to BK of
the air handler
Thermostat Air Handler Outdoor
Unit
R
G
B
W1
W2
B
Y
R
G
B/C
Y
W1
W2
Blue
24 VAC HOT
FAN
24 VAC
Common
SOV
COOL/HEAT
1st STAGE
HEATING
2nd STAGE
EMERGENCY
HEAT Pink
White
O
Y1
Y2
*
BK
WH/BLK
BK
WH/BLK
**
With Furnace With Variable Speed Furnace
• Units with pigtails require wirenuts for connections. Cap all unused wires.
•
In AC systems for multiple stages of heat, jumper W1 and W2 together if comfort control has only one stage of heat.
* If equipped with second stage heat
** When using a BK enabled comfort control, cut BK jumper and bypass Y and YLo at the furnace. Connect BK from comfort control
to
BK of the furnace
Thermostat Furnace Furnace
Outdoor
Unit
R
G
B
W1
W2
B
Y
R
G
B/C
W1
W2
24 VAC HOT
FAN
24 VAC
Common
COOL
HEATING
YY1 YY
Y
LO
Thermostat Outdoor
Unit
R
G
B
W1
W2
B
R
G
B/C
Y1
W1
W2
24 VAC HOT
FAN
24 VAC
Common
COOL
HEATING
O
BK
BK **
**
**

12 88-M4PW003-1B-EN
Section 12. Electrical - High Voltage
12.1 High Voltage Power Supply
The high voltage power supply must agree with
the equipment nameplate.
Power wiring must comply with national, state,
and local codes.
Follow instructions on unit wiring diagram located
on the inside of the control box cover and in the
Service Facts document included with the unit.
12.2 High Voltage Disconnect Switch
12.3 High Voltage Ground
Ground the outdoor unit per national, state, and
local code requirements.
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and
troubleshooting of this product, it may be nec-
essary to work with live electrical components.
Failure to follow all electrical safety precau-
tions when exposed to live electrical compo-
nents could result in death or serious injury.
s
s
WARNING
Install a separate disconnect switch at the
outdoor unit.
For high voltage connections, flexible electri-
cal conduit is recommended whenever vibra-
tion transmission may create a noise problem
within the structure.
Section 13. Start Up
13.1 System Start Up
STEP 2 - Set System Thermostat to OFF.
OFF
D
O
N
E
CANCEL
STEP 1 - Ensure Sections 7 through 12 have
been completed.

88-M4PW003-1B-EN 13
STEP 3 - Turn on disconnect(s) to apply power
to the indoor and outdoor units.
STEP 5 - Set system thermostat to ON.
ON
OFF
STEP 4 - Wait one (1) hour before starting the
unit if compressor crankcase heater acces-
sory is used and the Outdoor Ambient is below
70ºF. 60 MIN.
ON
D
O
N
E
CANCEL
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recommended*
method of charging above 55º F ambient outdoor tem-
perature.
*Weigh-In Method can be used for initial installation,
or system replacement when power is not available or
when the desired temperatures for the standard charging
method are outside normal bounds. See Section 14.3.
For best results the indoor temperature should be kept
between 70º F to 80º F.
Note: It is important to return in the spring or summer to
accurately charge the system in the cooling mode when
outdoor ambient temperature is above 55º F.
Section 14. System Charge Adjustment
14.1 Temperature Measurements
Indoor Temp
80º F
70º F
Outdoor Temp
55º F
120º F

14 88-M4PW003-1B-EN
LIFT
STEP 1 - Use the refrigerant line total length
and lift measurements from Section 5.3.
Total Line Length = __________ Ft.
Vertical Change (Lift) = __________ Ft.
14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)
Design Subcooling Value = __________º F Subcooling Correction = __________º F
(from nameplate or Service Facts)
Final Subcooling Value = __________º F
STEP 2 - Determine the nal subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.
018 Units
50 4°
40
30 1°
25 Use Design Subcooling 1°
15
10
0
20 30 40 50 60 70 80 90 100 110 120130 140 150
Add 1°
Add 1°
Add 1°
Add 2°
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
024 Units
50
1°
40
30
25
Use Design Subcooling
15
10
0
20 30 40 50 60 70 80 90 100 110 120130 140 150
Add 1°
Add 1°
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
Add 2°
REFRIGERANT LINE LIFT (FT)
030 Units
50
1°
40
30
25
Use Design Subcooling
15
1°
10
0
20 30 40 50 60 70 80 90 100 110 120130 140 150
Add 1°
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
Add 2°
Add 1°
036 Units
50
4°
40
30
25
Use Design Subcooling
15
1°
10
0
20 30 40 50 60 70 80 90 100 110 120130 140 150
Add 1°
Add 2°
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
Add 1°
048 Units
50
40
30
1°
25
Use Design Subcooling 1°
15
1°
10
0
20 30 40 50 60 70 80 90 100 110 120130 140 150
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
Add 1°
Add 1° Add 2°
50
40
30
25
Use Design Subcooling
15
10
0
20 30 40 50 60 70 80 90 100 110 120 130 140 150
Add 1°
Add 1°
Add 1°
Add 2°
Add 4°
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
042 Units

88-M4PW003-1B-EN 15
STEP 4 - Measure the liquid line temperature
and pressure at the outdoor unit’s service valve.
Measured Liquid Line Temp = __________ º F
Liquid Gage Pressure = __________ PSI
Final Subcooling Value = __________ º F
STEP 5 - Use the nal subcooling value, refriger-
ant temperature and pressure from STEP 4, to
determine the proper liquid gage pressure using
Table 14.2.
Example: Assume a 12º F Final Subcooling
value and liquid temp of 90º F.
1. Locate 12º F Final Subcooling in Table 14.2.
2. Locate the Liquid Temperarature (90º F) in
the left column.
3. The Liquid Gage Pressure should be ap-
proximately 327 PSI. (This is the shown as
the intersection of the Final Subcooling column
and the Liquid Temperature row.
Table 14.2
8910 11 12 13 14
179 182 185 188 191 195 198
195 198 201 204 208 211 215
211 215 218 222 225 229 232
229 232 236 240 243 247 251
247 251 255 259 263 267 271
267 271 275 279 283 287 291
287 291 296 300 304 309 313
309 313 318 322 327 331 336
331 336 341 346 351 355 360
355 360 365 370 376 381 386
381 386 391 396 402 407 413
407 413 418 424 429 435 441
435 441 446 452 458 464 470
464 470 476 482 488 495 501
495 501 507 514 520 527 533
R-410A REFRIGERANT CHARGING CHART
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
LIQUID
TEMP
(°F)
FINAL SUBCOOLING (°F)
LIQUID GAGE PRESSURE (PSI)
From Dwg. D154557P01 Rev. 3
107 °F
STEP 3 - Stabilize the system by operating for a
minimum of 20 minutes.
At startup, or whenever charge is removed or
added, the system must be operated for a mini-
mum of 20 minutes to stabilize before accurate
measurements can be made.
20 MIN.

16 88-M4PW003-1B-EN
STEP 6 - Adjust refrigerant level to attain
proper gage pressure.
Add refrigerant if the Liquid Gage Pressure
is lower than the chart value.
1. Connect gages to refrigerant bottle
and unit as illustrated.
2. Purge all hoses.
3. Open bottle.
4. Stop adding refrigerant when liquid
line temperature and Liquid Gage
Pressure matches the charging chart
Final Subcooling value.
Recover refrigerant if the Liquid Gage Pres-
sure is higher than the chart value.
20 MIN.
STEP 7 - Stabilize the system.
1. Wait 20 minutes for the system condi-
tion to stabilize between adjustments.
Note: When the Liquid Line Temperature and
Gage Pressure approximately match the chart,
the system is properly charged.
2. Remove gages.
3. Replace service port caps to prevent
leaks. Tighten nger tight plus an ad-
ditional 1/6 turn.
STEP 9 - Record System Information for refer-
ence.
Record system pressures and temperatures
after charging is complete.
Outdoor model number = _________________
Measured Outdoor Ambient = __________ º F
Measured Indoor Ambient = __________ º F
Measured Liquid Line Temp = __________ º F
Measured Suction Line Temp = __________ º F
Liquid Gage Pressure = __________ PSI
Suction Gage Pressure = __________ PSI
STEP 8 - Verify typical performance.
Refer to System Pressure Curves in the Service
Facts to verify typical performance.
(Example only - see Service Facts)
PRESSURE CURVES FOR 4TTX5049E1
4TXCD010CC3
Cooling @ 1400 CFM
LIQUID PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
SUCTIO
N PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB
TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1);
LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN .
EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
:LAUTCANOITCESRETNITA)3(
(4) LIQUID PRESSURE @ 1400 CFM IS 297 PSIG LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 1400 CFM IS 139 PSIG SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART
INTERCONNECTING LINES
GAS - 7/8 " O.D.
LIQUID - 3/8 " O.D.
DWG.NO. 4TTX5049E1
110
115
120
125
130
135
140
145
150
155
160
165
170
40 50 60 70 80 90 100 110 120
170
220
270
320
370
420
470
520
40 50 60 70 80 90 100 110 120
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.

88-M4PW003-1B-EN 17
Weigh-In Method can be used for the initial
installation, or anytime a system charge is being
replaced. Weigh-In Method can also be used
when power is not available to the equipment
site or operating conditions (indoor/outdoor
temperatures) are not in range to verify with the
subcooling charging method.
14.3 Weigh-In Method for Charging
Calculating Charge Using the Weigh-In Method
STEP 1 - Measure in feet the distance between the
outdoor unit and the indoor unit and record on Line 1.
Include the entire length of the line from the service
valve to the IDU.
STEP 2 - Enter the charge multiplier (0.6 oz/ft). Each
linear foot of interconnecting tubing requires the ad-
dition of 0.6 oz of refrigerant.
STEP 3 - Multiply the total length of refrigerant tubing
(Line 1) times the value on Step 2. Record the result
on Line 3 of the Worksheet.
STEP 4 - This is the amount of refrigerant to weigh-in
prior to opening the service valves.
1. Line length (ft) ______________
2. Charge multiplier x ____ 0.6 ______
3. Step 1 x Step 2 = _____________
4. Refrigerant = _____________
1. Leak check refrigerant lines. ....................................... [ ]
2. Properly insulate suction lines and ttings. .................. [ ]
3. Properly secure and isolate all refrigerant lines. .......... [ ]
4. Seal passages through masonry.
If mortar is used, prevent mortar from coming
into direct contact with copper tubing........................... [ ]
5. Verify that all electrical connections are tight. .............. [ ]
6. Observe outdoor fan during on cycle for clearance
and smooth operation................................................... [ ]
7. Be sure that indoor coil drain line drains freely. Pour water
Section 15. Checkout Procedures and Troubleshooting
15.1 Operational And Checkout Procedures
CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the following list:
Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance, all units
must be operated and charge adjustments made.
Important: Perform a final unit inspection to be sure that factory tubing has not shifted during shipment. Adjust tubing if nec-
essary so tubes do not rub against each other when the unit runs. Also be sure that wiring connections are tight and properly
secured.
into drain pan................................................................ [ ]
8. Be sure that supply registers and return grilles are open
and unobstructed.......................................................... [ ]
9. Be sure that a return air lter is installed. ..................... [ ]
10. Be sure that the correct airow setting is used.
(Indoor blower motor)................................................... [ ]
11. Operate complete system in each mode to
ensure safe operation................................................... [ ]

18 88-M4PW003-1B-EN
SYSTEM FAULTS
REFRIGERANT CIRCUIT
Head Pressure To o High
Head Pressure To o Low
Suction Pressure To o High
Suction Pressure To o Low
Liquid Refrig. Floodback (TXV/EEV)
Liquid Refrig. Floodback
(Cap. Tube)
I.D. Coil Frosting
Compressor Runs
Inadequate or No Cooling/Htg
ELECTRICAL
Compressor & O.D. Fan
Won’t Start
Compressor Will Not Start
But O.D. Fan Runs
O.D. Fan Won’t Start
Compressor Hums But Won’t Start
Compressor Cycles on IOL
I.D. Blower Won’t Start
DEFROST
Unit Won’t Initiate Defrost
Defrost Terminates on Time
Unit Icing Up
WHAT TO CHECK MODE
POWER SUPPLY
HIGH VOLTAGE WIRING
COMPRESSOR IOL
RUN CAPACITOR
START CAPACITOR
START RELAY
CONTACTOR CONTACTS
LOW VOLTAGE WIRING
CONTROL TRANSFORMER
THERMOSTAT
CONTACTOR COIL
LOW VOLTAGE FUSE
STUCK COMPRESSOR
INEFFICIENT COMP.
REF. UNDERCHARGE
REF. OVERCHARGE
EXCESSIVE EVAP. LOAD
NONCONDENSABLES
RES. O.D. AIRFLOW
O.D. AIR RECIRCULATION
TXV/EEV STUCK OPEN
SUPERHEAT
RES. I.D. AIRFLOW
REF. CIR. RESTRICTIONS
SOV LEAKING
SOV COIL DEFECTIVE
CHECK VALVE LEAKING
*
DEFROST RELAY DEF.
DEFROST CONTROL DEF.
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
P
P
P
P
S
S
S
S
P
P
P
P
S
S
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
S
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
S
S
S
S
S
S
S
P
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
P
P
S
S
S
S
S
S
S
S
S
S
S
S
P
P
P
P
P
P
S
S
S
S
S
S
S
S
S
S
S
P
P
S
S
S
S
S
S
S
S
P
P
P
P
P
P
P
S
S
PP
P
P
C - Cooling H - Heating P - Primary Causes S - Secondary Causes
*
- 3 Phase Only
15.2 Troubleshooting

88-M4PW003-1B-EN 19
Is contactor
engergized?
(contacts closed)
Compressor fails to start
Contactor check
YES
YES
YES YES
NO
NO
NO
NO NO
If applicable, is TDR
input voltage
present
Go To: Compressor won’t run
Check for 24 volts AC
across contactor coil
Is voltage
present at
contactor coil? Replace contactor
Check control
transformer and
control fuse
Is the control
transformer
and fuse good?
Jumper R to Y low
voltage terminals
at thermostat sub
base.
Does the
contactor
energize?
Replace the room
thermostat
Repair or replace
transformer or fuse.
Investigate cause for
failure (possible short in
field wiring)
Repair or replace
connecting wiring
NO
Check ID Low
voltage
transformer
YES
Wait 3 minutes and
check contactor
coil again
L2 L1
T2 T1
IN
OUT
L2 L1
T2 T1
Single Pole Contactor (MS)* Double Pole Contactor (MS)*
Contactor Coil
24 VAC
HIGH
VOLT -
IN
OUT
HIGH
VOLT -
TROUBLESHOOTING

20 88-M4PW003-1B-EN
Check for open IOL
(Internal Overload)
Check resistance of
C to S and C to R
Does the
resistance check
show an open
circuit from C to S
or C to R?
YESAllow compressor
time to cool and
re-test
NO
Check for open
windings.
YES
Does a resistance check
show an open circuit
between R and S?
Replace the
compressor
NO
Check for locked
rotor
Is voltage present
at C to S and C
to R with locked
rotor amps on C?
YES
Check Start-
Capacitor and
Relay (if present)
and Run Capacitor
Do the start
components and
run capacitor
check good?
YESReplace the
compressor
NO
Replace start
components and/
or run capacitor
NO
Check wiring to
compressor
C, S and R
Check for high
voltage to contactor
Is high voltage present
at T1 and T2 ?
YES
NO
Check power
supply from
disconnect and/or
breaker panel.
Compressor won’t run
Contactor is closed
TROUBLESHOOTING