Remington REM-05-240-GH Service manual

Service Manual – R410A Models
PTAC - PD Series (Electronic Controls)
Packaged Terminal Air Conditioners
Packaged Terminal Heat Pumps
PD-ServMan-E (2-10)
TECHNICAL SUPPORT
CONTACT INFORMATION
FRIEDRICH AIR CONDITIONING CO.
Post Office Box 1540 · San Antonio, Texas 78295-1540
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212
(210) 357-4400 · 1-800-541-6645 · FAX (210) 357-4490
www.friedrich.com
Printed in the U.S.A.
Table of Contents
Important Safety Information ...........................................2-4
Capillary Tube Systems/Check Valve ...........................23
Introduction .........................................................................4
Reversing Valve — Description/Operation ...................24
Unit Identification ................................................................5
Testing Coil ...................................................................24
Component Identification ....................................................6
Checking Reversing Valves .....................................24-25
Chassis Specifications ........................................................7
Reversing Valve
Touch Testing Heating/Cooling Cycle ..........................25
Performance Data ...............................................................8
Electrical Rating Tables .......................................................9
Power Cord Information ......................................................9
Remote Wall Thermostat / Low Voltage
Wire Connections .............................................................10
Procedure For Changing Reversing Valve ..............25-26
Compressor Checks .....................................................26
Locked Rotor Voltage Test ............................................26
Single Phase Connections ............................................26
Digital Control Features ...............................................11-12
Determine Locked Rotor Voltage ..................................26
Digital Control Operation ..................................................13
Locked Rotor Amperage Test ........................................26
Digital Control User Input Configuration ...........................14
Single Phase Running & Locked Rotor Amperage .......28
Optional Hand Held Remote Control Operation ...............15
Checking the Overload ............................................26-27
Digital Control Diagnostics & Test Mode ..........................15
External Overload .........................................................27
Electronic Control Error Code Diagnostics .......................16
Compressor Single Phase Resistance Test ..................27
Components Testing ....................................................17-18
Compressor Replacement .......................................28-29
Refrigeration System Sequence of Operation ..................19
Routine Maintenance ....................................................29
Sealed Refrigeration System Repairs ...............................20
Troubleshooting Charts ....................................................30-31
Refrigerant Charging .........................................................20
Wiring Diagram Index .............................................................32
Method Of Charging ..........................................................21
Wiring Diagrams for Cool with Electric Heat .........................33
Undercharged Refrigerant Systems .............................21-22
Wiring Diagrams for Heat Pump with Electric Heat ................34
Overcharged Refrigerant Systems ....................................22
Remote Thermostat Wiring Diagram ......................................35
Restricted Refrigerant Systems .........................................22
Technical Service Data ...........................................................36
1
IMPORTANT SAFETY INFORMATION
The information contained in this manual is intended for use by a qualified service technician who is familiar
with the safety procedures required for installation and repair, and who is equipped with the proper tools and
test instruments required to service this product.
Installation or repairs made by unqualified persons can result in subjecting the unqualified person making
such repairs as well as the persons being served by the equipment to hazards resulting in injury or electrical
shock which can be serious or even fatal.
Safety warnings have been placed throughout this manual to alert you to potential hazards that may be
encountered. If you install or perform service on equipment, it is your responsibility to read and obey these
warnings to guard against any bodily injury or property damage which may result to you or others.
Your safety and the safety of others are very important.
We have provided many important safety messages in this manual and on your appliance. Always read
and obey all safety messages.
This is a safety Alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol with the word “WARNING”
or “CAUTION”. These words mean:
WARNING
You can be killed or seriously injured if you do not follow instructions.
CAUTION
You can receive minor or moderate injury if you do not follow instructions.
All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury,
and tell you what will happen if the instructions are not followed.
NOTICE
2
A message to alert you of potential property damage will have the
word “NOTICE”. Potential property damage can occur if instructions
are not followed.
PERSONAL INJURY OR DEATH HAZARDS
ELECTRICAL HAZARDS:
•
Unplug and/or disconnect all electrical power to the unit before performing inspections, maintenance,
or service.
•
Make sure to follow proper lockout/tag out procedures.
•
Always work in the company of a qualified assistant if possible.
•
Capacitors, even when disconnected from the electrical power source, retain an electrical charge
potential capable of causing electric shock or electrocution.
•
Handle, discharge, and test capacitors according to safe, established, standards, and approved
procedures.
•
Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary to
test or troubleshoot equipment with the power on to the unit.
•
Do not spray or pour water on the return air grille, discharge air grille, evaporator coil, control panel,
and sleeve on the room side of the air conditioning unit while cleaning.
•
Electrical component malfunction caused by water could result in electric shock or other electrically
unsafe conditions when the power is restored and the unit is turned on, even after the exterior is dry.
•
Never operate the A/C unit with wet hands.
•
Use air conditioner on a single dedicated circuit within the specified amperage rating.
•
Use on a properly grounded outlet only.
•
Do not remove ground prong of plug.
•
Do not cut or modify the power supply cord.
•
Do not use extension cords with the unit.
•
Follow all safety precautions and use proper and adequate protective safety aids such as: gloves,
goggles, clothing, adequately insulated tools, and testing equipment etc.
•
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
REFRIGERATION SYSTEM HAZARDS:
•
Use approved standard refrigerant recovering procedures and equipment to relieve pressure before
opening system for repair.
•
Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor
to moderate injury.
•
Be extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s flame or hot
surfaces can cause serious burns.
•
Make sure to protect personal and surrounding property with fire proof materials.
•
Have a fire extinguisher at hand while using a torch.
•
Provide adequate ventilation to vent off toxic fumes, and work with a qualified assistant whenever
possible.
•
Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for
leaks, flushing etc.
3
•
Make sure to follow all safety precautions and to use proper protective safety aids such as: gloves,
safety glasses, clothing etc.
•
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
MECHANICAL HAZARDS:
•
Extreme care, proper judgment and all safety procedures must be followed when testing,
troubleshooting, handling, or working around unit with moving and/or rotating parts.
•
Be careful when, handling and working around exposed edges and corners of sleeve, chassis, and
other unit components especially the sharp fins of the indoor and outdoor coils.
•
Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.
•
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
PROPERTY DAMAGE HAZARDS
FIRE DAMAGE HAZARDS:
•
Read the Installation/Operation Manual for this air conditioning unit prior to operating.
•
Use air conditioner on a single dedicated circuit within the specified amperage rating.
•
Connect to a properly grounded outlet only.
•
Do not remove ground prong of plug.
•
Do not cut or modify the power supply cord.
•
Do not use extension cords with the unit.
•
Failure to follow these instructions can result in fire and minor to serious property damage.
WATER DAMAGE HAZARDS:
•
Improper installation maintenance, or servicing of the air conditioner unit, or not following the above
Safety Warnings can result in water damage to personal items or property.
•
Insure that the unit has a sufficient pitch to the outside to allow water to drain from the unit.
•
Do not drill holes in the bottom of the drain pan or the underside of the unit.
•
Failure to follow these instructions can result in result in damage to the unit and/or minor to serious
property damage.
INTRODUCTION
This service manual is designed to be used in conjunction with the installation manuals provided with each unit.
This service manual was written to assist the professional HVAC service technician to quickly and accurately
diagnose and repair any malfunctions of this product.
This manual, therefore, will deal with all subjects in a general nature. (i.e. All text will pertain to all models).
IMPORTANT: It will be necessary for you to accurately identify the unit you are
servicing, so you can be certain of a proper diagnosis and repair.
(See Unit Identification.)
4
UNIT IDENTIFICATION
Model Number Code
PD H 07 K 3
S E
A
Series
PD = P Series Digital PTAC
Engineering Digit
Design Series
System
E = Cooling with or
without electric heat
Options
H = Heat Pump with
Auxiliary Heat
S = Standard
Nominal Cooling Capacity
07 = 7000 BTUh
09 = 9000 BTUh
12 = 12000 BTUh
15 = 15000 BTUh
Nominal Heater Size
(@ 230V or 265V)
0 = No Heater
2 = 2.5KW
3 = 3.4KW
5 = 5.0KW
Voltage
K = 208/230V - 1Ph. - 60Hz.
R = 265V - 1Ph. - 60Hz.
PTAC Serial Number Identification Guide
SERIAL NUMBER
A
K
YEAR MANUFACTURED
LJ = 2009 AE = 2015
AK = 2010 AF = 2016
AA = 2011 AG = 2017
AB = 2012 AH = 2018
AC = 2013 AJ = 2019
AD = 2014
MONTH MANUFACTURED
A = Jan
D = Apr
G = Jul
B = Feb
E = May
H = Aug
C = Mar
F = Jun
J = Sep
A
M
00001
PRODUCTION RUN NUMBER
PRODUCT LINE
M = PTAC
K = Oct
L = Nov
M = Dec
5
Component Identification
Typical Unit Components and Dimensions
Wall Sleeve
Outdoor Louver
Filters
Chassis
Return Air Grille
Front Cover
PDXWS Wall Sleeve Dimensions:
16” H x 42” W x 13 3 4 ” D
Front Cover Dimensions:
16” H x 42” W x 7 1 2 ” D
Cut-Out Dimensions:
16 1 4” x 42 1 4 ”
ELECTRIC HEAT DATA
PDE/PDH07K
HEATER WATTS
VOLTAGE
HEATING BTUh
HEATING CURRENT (AMPS)
MINIMUM CIRCUIT AMPACITY
BRANCH CIRCUIT FUSE (AMPS)
2500/2050 3400/2780
230/208
8500/7000 11600/9500
11.4/10.4
15.3/13.9
14.1
19.0
15
20
PDE/PDH07R
2500
0 Kw
11600
13.2
16.4
20
0
0
0.0
15
265
8500
9.8
12.2
15
PDE/PDH09K
PDE09K0
3400
PDE/PDH09R
2500/2050 3400/2780 5000/4090
230/208
8500/7000 11600/9500 17000/13900
11.4/10.4
15.3/13.9
22.3/20.3
14.1
19
27.8
15
20
30
2500
8500
9.8
12.2
15
3400
265
11600
13.2
16.4
20
5000
17000
19.5
24.2
30
ELECTRIC HEAT DATA
PDE12K0
HEATER WATTS
0 Kw
VOLTAGE
HEATING BTUh
HEATING CURRENT (AMPS)
MINIMUM CIRCUIT AMPACITY
BRANCH CIRCUIT FUSE (AMPS)
6
0
0
0
15
PDE/PDH12K
2500/2050 3400/2780 5000/4090
230/208
8500/7000 11600/9500 17000/13900
11.4/10.4
15.3/13.9
22.3/20.3
14.1
19
27.8
15
20
30
PDE/PDH12R
2500
8500
9.8
12.2
15
3400
265
11600
13.2
16.4
20
PDE15K0
5000
0 Kw
17000
19.5
24.2
30
0
0
0
15
PDE/PDH15K
2500/2050 3400/2780 5000/4090
230/208
8500/7000 11600/9500 17000/13900
11.4/10.4
15.3/13.9
22.3/20.3
14.1
19
27.8
15
20
30
PDE/PDH15R
2500
8500
9.8
12.2
15
3400
265
11600
13.2
16.4
20
5000
17000
19.5
24.2
30
Chassis Specifications
PDE Series Air Conditioner with Electric Heat - Chassis Specifications
MODEL
PDE07K PDE07R PDE09K PDE09R
PDE12K
PDE12R
PDE15K
PDE15R
PERFORMANCE DATA:
7500/7300
11.6
1.7
7500
11.4
1.6
9000/8800
11.4
3.4
9000
11.0
3.3
11500/11300
10.2
2.9
11500
10.1
2.8
14500/14000
9.42/9.3
3.8
14000
9.3
3.8
230/208
3.3/3.4
13.0
2.9
265
2.9
15.0
2.6
230/208
3.6/3.9
19.8
3.7
265
3.3
16.8
3.2
230/208
5.5/5.8
27.0
5.0
265
4.6
23.0
4.0
230/208
7.0/7.4
32.0
6.3
265
6.4
27.0
5.6
220
200
60
245
200
60
220
200
60
210
200
60
325
260
70
315
260
70
310
280
70
340
280
70
DIMENSIONS
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
NET WEIGHT
105
125
42
PDH09R
PDH12K
PDH12R
PDH15K
PDH15R
COOLING BTUh
EER
DEHUMIDIFICATION (pints/hr)
ELECTRICAL DATA:
VOLTAGE (1 PHASE, 60 Hz)
CURRENT (AMPS)
AMPS L.R.
AMPS F.L.
AIRFLOW DATA:
INDOOR CFM, HIGH
INDOOR CFM, LOW
VENT CFM
PHYSICAL DATA:
SHIPPING WEIGHT
R-410A CHARGE (oz)
105
125
35
112
132
36
PDH Series Heat Pump - Chassis Specifications
MODEL
PDH07K PDH07R PDH09K
112
132
35
120
140
33
120
140
35
125
145
48
125
145
42
PERFORMANCE DATA:
7300/7300
11.1/11.1
6400/6200
625/606
3.0/3.0
1.3
7200
11.1
6300
615
3.0
1.3
8500/8300
10.8
8000
781
3.0
1.9
8500
10.5
7700
752
3.0
2.1
11500/11300
9.8
10500
1025
3.0
2.8
12000
9.7
10500
1025
3.0
2.9
14000/13800
9.2
12800
1250
3.0
3.6
14000
9.2
12800
1250
3.0
3.7
230/208
3.2/3.3
2.7/2.8
13.0
2.9
265
2.8
2.6
15.0
2.6
230/208
3.6/3.9
4.3/4.5
19.8
3.7
265
3.3
3.0
16.8
3.2
230/208
5.4/5.7
4.4/4.7
27.0
5.0
265
5.2
4.4
23.0
4.5
230/208
6.7/7.3
6.2/6.5
32.0
6.3
265
6.3
5.6
27.0
5.6
210
200
60
240
200
60
220
200
60
210
200
60
320
260
70
310
260
70
315
280
70
330
280
70
DIMENSIONS
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
16x42x13.5
NET WEIGHT
105
125
37
COOLING BTUh
EER
REVERSE HEATING BTUh
POWER (WATTS) HEAT
COP
DEHUMIDIFICATION (pints/hr)
ELECTRICAL DATA:
VOLTAGE (1 PHASE, 60 Hz)
CURRENT (AMPS)
REVERSE HEAT. Amps
AMPS L.R.
AMPS F.L.
AIRFLOW DATA:
INDOOR CFM, HIGH
INDOOR CFM, LOW
VENT CFM
PHYSICAL DATA:
SHIPPING WEIGHT
R-410A CHARGE (oz)
105
125
37
112
132
37
112
132
33
120
140
41
120
140
40
125
145
39
125
145
42
7
EXTENDED PERFORMANCE 230 208V
Extended Performance 208-230 Volt Models
PDE - EXTENDED COOLING PERFORMANCE
OUTDOOR DRY BULB TEMP. (DEGREES F AT 40% R.H.)
75
85
95
105
110
INDOOR WET BULB TEMP. (DEGREES F AT 80 F D.B.)
PDE07
PDE09
PDE12
PDE15
BTUh
WATTS
AMPS
SHR
BTUh
WATTS
AMPS
SHR
BTUh
WATTS
AMPS
SHR
BTUh
WATTS
AMPS
SHR
72
67
62
72
67
62
72
67
62
72
67
62
72
67
62
8820
8483
7853
8400
7920
7305
8070
7500
6638
7560
6713
5918
6728
5790
5115
528
536
542
575
581
588
647
647
647
699
699
701
763
763
766
2.7
2.7
2.8
2.9
3.0
3.0
3.3
3.30
3.3
3.6
3.6
3.6
3.9
3.9
3.9
0.53
0.72
0.96
0.54
0.74
0.98
0.54
0.77
0.99
0.55
0.81
0.99
0.58
0.87
0.99
10584
10179
9423
10080
9504
8766
9684
9000
7965
9072
8055
7101
8073
6948
6138
644
654
661
701
709
717
789
789
789
853
852
854
930
930
934
3.0
3.0
3.0
3.2
3.2
3.2
3.6
3.60
3.6
3.9
3.9
3.9
4.2
4.2
4.2
0.49
0.66
0.89
0.5
0.69
0.91
0.50
0.71
0.91
0.51
0.75
0.92
0.54
0.80
0.91
13524
13007
12144
11201 12374
11500
10178 11592
10293
9074
10316
8878
7843
920
934
944
1002
1012
1024
1127
1127
1127
1218
1217
1221
1329
1329
1334
4.6
4.6
4.6
4.9
4.9
5.0
5.5
5.50
5.5
5.9
5.9
5.9
6.5
6.5
6.5
0.49
0.66
0.89
0.50
0.69
0.91
0.50
0.71
0.91
0.51
0.75
0.92
0.54
0.8
0.91
16464
15834
14658 15680
14784
13636 15064
14000
12390 14112
12530
11046 12558
10808
9548
1228
1248
1261
1338
1351
1368
1505
1505
1505
1627
1625
1630
1774
1774
1782
5.8
5.8
5.9
6.2
6.3
6.3
7.0
7.00
7.0
7.5
7.5
7.6
8.2
8.2
8.2
0.47
0.63
0.85
0.48
0.66
0.87
0.48
0.68
0.87
0.49
0.72
0.88
0.51
0.77
0.87
12041 12880
RATING POINT
ARI 310/380
PDH - EXTENDED COOLING PERFORMANCE
OUTDOOR DRY BULB TEMP. (DEGREES F AT 40% R.H.)
75
85
95
105
110
INDOOR WET BULB TEMP. (DEGREES F AT 80 F D.B.)
PDH07
PDH09
PDH12
PDH15
BTUh
WATTS
AMPS
SHR
BTUh
WATTS
AMPS
SHR
BTUh
WATTS
AMPS
SHR
BTUh
WATTS
AMPS
SHR
72
67
62
72
67
62
72
8585
8256
7643
8176
7709
7110
7855
62
72
67
62
72
67
62
7300
6461
7358
6534
5760
6548
5636
4979
537
545
551
585
591
598
2.6
2.7
2.7
2.9
2.9
2.9
658
658
658
711
711
713
776
776
779
3.2
3.20
3.2
3.4
3.4
3.5
3.8
3.8
0.53
0.73
0.98
0.55
0.75
3.8
1.00
0.55
0.78
1.00
0.56
0.82
1.01
0.59
0.88
1.00
9996
9614
8900
9520
642
652
660
700
8976
8279
9146
8500
7523
8568
7608
6707
7625
6562
5797
707
715
787
787
787
851
850
852
928
928
3.0
3.0
3.0
932
3.2
3.2
3.2
3.6
3.60
3.6
3.9
3.9
3.9
4.2
4.2
0.50
0.68
0.91
4.2
0.51
0.71
0.93
0.51
0.73
0.94
0.53
0.77
0.94
0.55
0.82
0.93
13524
13007
12144
11201 12374
11500
957
972
983
1043
1053
1066
1173
1173
10178 11592
10293
9074
10316
8878
7843
1173
1268
1267
1270
1383
1383
4.5
4.5
4.5
4.8
4.8
4.9
5.4
1389
5.40
5.4
5.8
5.8
5.8
6.3
6.3
0.49
0.67
0.90
0.50
0.70
0.92
0.51
6.4
0.72
0.92
0.52
0.76
0.93
0.54
0.81
0.92
16464
15834
14658 15680
14784
13636 15064
14000
12390 14112
12530
1242
1262
1275
1353
1367
1383
1522
1522
1522
1645
1644
11046 12558
10808
9548
1648
1794
1794
5.5
5.6
5.6
6.0
6.0
6.0
6.7
6.7
6.7
7.2
1802
7.2
7.2
7.9
7.9
0.48
0.65
0.88
0.49
0.68
0.89
0.49
0.70
0.90
0.50
7.9
0.74
0.9
0.53
0.79
0.9
12041 12880
RATING POINT
ARI 310/380
EXTENDED HEATING PERFORMANCE
OUTDOOR DRY BULB TEMP. (DEGREES F)
PDH07
PDH09
PDH12
PDH15
8
BTUh
WATTS
AMPS
BTUh
WATTS
AMPS
BTUh
WATTS
AMPS
BTUh
WATTS
AMPS
37
5333
589
2.6
5930
701
3.8
7582
896
4.2
10134
1151
5.7
42
5628
600
2.8
6320
712
3.8
8372
931
4.3
10442
1166
5.8
47
6400
625
2.75
8000
781
3.9
10500
1025
4.7
12800
1250
6.3
RATING POINT
ARI 310/380
52
7009
635
2.9
8540
786
3.9
11067
1055
4.9
14003
1324
6.6
57
7741
671
3
9130
797
4
12006
1089
5.1
15341
1384
6.9
ELECTRICAL RATING TABLES
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. All electrical connections and
wiring MUST be installed by a qualified
electrician and conform to the National
Electrical Code and all local codes which
have jurisdiction. Failure to do so could result
in serious personal injury or death.
NOTE: Use Copper Conductors ONLY. Wire sizes
are per NEC, check local codes for overseas applications.
Table 1
WIRE SIZE
Use ONLY wiring size recommended for
single outlet branch circuit.
FUSE/CIRCUIT
BREAKER
Use ONLY type and size fuse or HACR
circuit breaker indicated on unit’s rating
plate. Proper current protection to the unit
is the responsibility of the owner. NOTE:
A time delay fuse is provided with 265V
units.
GROUNDING
Unit MUST be grounded from branch
circuit through service cord to unit, or
through separate ground wire provided
on permanently connected units. Be sure
that branch circuit or general purpose
outlet is grounded. The field supplied
outlet must match plug on service cord
and be within reach of service cord. Refer
to Table 1 for proper receptacle and fuse
type. Do NOT alter the service cord or
plug. Do NOT use an extension cord.
RECEPTACLE
The field supplied outlet must match plug
on service cord and be within reach of
service cord. Refer to Table 1 for proper
receptacle and fuse type. Do NOT alter
the service cord or plug. Do NOT use an
extension cord.
WIRE SIZING
Use recommended wire size given
in Table 2 and install a single branch
circuit. All wiring must comply with local
and national codes. NOTE: Use copper
conductors only.
250 V Receptacles and Fuse Types
15
AMPS
20*
30
RECEPTACLE
TIME-DELAY TYPE FUSE
(or HACR circuit breaker)
15
20
30
HACR – Heating, Air Conditioning, Refrigeration
* May be used for 15 Amp applications if fused for 15 Amp
NOTE: 265 volt units are hard wired.
Table 2
Recommended branch circuit wire sizes*
NAMEPLATE / MAXIMUM
CIRCUIT BREAKER SIZE
15
20
30
AWG WIRE SIZE**
14
12
10
AWG – American Wire Gauge
* Single circuit from main box
** Based on copper wire, single insulated conductor at 60°C
POWER CORD INFORMATION (230/208V MODELS ONLY)
All Friedrich 230/208V PTAC units are shipped from the
factory with a Leakage Current Detection Interrupter (LCDI)
equipped power cord. The LCDI device meets the UL and
NEC requirements for cord connected air conditioners
effective August 2004.
requires resetting the cause of the trip should be identified
prior to further use of the PTAC.
If the device fails to trip when tested or if the power supply cord
is damaged it must be replaced with a new supply cord obtained
from the product manufacturer, and must not be repaired.
To test your power supply cord:
1. Plug power supply cord into a grounded 3 prong outlet.
2. Press RESET.
3. Press TEST (listen for click; Reset button trips and pops
out).
4. Press and release RESET (listen for click; Reset button
latches and remains in). The power supply cord is ready for
operation.
NOTE: The LCDI device is not intended to be used as a
switch.
Once plugged in the unit will operate normally without the
need to reset the LCDI device. If the LCDI device trips and
9
REMOTE THERMOSTAT AND LOW VOLTAGE
CONTROL CONNECTIONS
Room Thermostats
Room thermostats are available from several different
manufacturers in a wide variety of styles. They range from
the very simple Bimetallic type to the complex electronic setback type. In all cases, no matter how simple or complex,
they are simply a switch (or series of switches) designed to
turn equipment (or components) “ON” or “OFF” at the desired
conditions.
An improperly operating, or poorly located room thermostat
can be the source of perceived equipment problems. A careful
check of the thermostat and wiring must be made then to
insure that it is not the source of problems.
Remote Thermostat
All Friedrich PD model PTAC units are factory configured to
be controlled by either the chassis mounted Smart Center
or a 24V single stage remote wall mounted thermostat. The
thermostat may be auto or manual changeover as long as the
control configuration matches that of the PTAC unit.
Manual Changeover Thermostat
For Heat Pump equipped units: A single stage, heat/cool
thermostat with a terminal for a reversing valve operation is
required. Terminal “B” should be continuously energized in the
heat mode and terminal “G” should be energized whenever
there is a call for heating or cooling. Typically, a single stage,
heat/cool thermostat designed for use with electric heat
systems will meet the above requirements.
To control the unit with a wall mounted thermostat follow
the steps below:
1) With the front cover removed locate the low voltage
terminal strip at the lower portion of the Smart Center.
2) Remove the jumper between the ‘GL’ and GH’
terminals.
3) The control is now configured for control by a wall
thermostat. The Smart Center will no longer control the
unit.
4) If desired the accessory escutcheon kit (PDXRT) is to
be used, install it over the existing control panel
Note: To revert back to the Smart Center control of the unit
replace the jumper wire between the ‘GL’ and ‘GH’ terminals
that was removed in step 1.
Remote Thermostat Control
Heat Pump with Electric Heat Operation
When there is a call for heat from the wall thermostat the
control board will receive signals on terminals W, B, GL or
GH. During compressor lock-out time, the electric heat will
turn on first. When the compressor lock-out time is up, the
compressor will turn on. If the outdoor coil temperature sensor
drops to 30° F or less for 2 consecutive minutes then the unit
will switch to electric heat.
10
Thereafter, the unit will switch back to heat pump heat if the
outdoor coil temperature sensor rises to 45’ F or greater.
Thermostat Connections
C = Common Ground
W = Call for Heating
Y = Call for Cooling
R = 24V Power from Unit
GL = Call for Low Fan
GH = Call for High Fan
B = Reversing Valve Energized in heating mode
(PDH Models Only)
*If only one G terminal is present on thermostat connect to
GL for low fan or to GH for high fan operation.
NOTE: It is the installer’s responsibility to ensure that all
control wiring connectiions are made in accordance with
the Friedrich installation instructions. Improper connection
of the thermostat control wiring and/or tampering with the
unit’s internal wiring can void the equipment warranty.
Questions concerning proper connections to the unit
should be directed to the factory: 210-357-4400.
Location
The thermostat should not be mounted where it may be
affected by drafts, discharge air from registers (hot or
cold), or heat radiated from the sun or appliances.
The thermostat should be located about 5 Ft. above the
floor in an area of average temperature, with good air
circulation. Close proximity to the return air grille is the
best choice.
Mercury bulb type thermostats MUST be level to control
temperature accurately to the desired set-point. Electronic
digital type thermostats SHOULD be level for aesthetics.
Thermostat Location
FRIEDRICH DIGITAL CONTROL FEATURES
The new Friedrich digital PTAC has state of the art features to improve guest comfort, indoor air quality and conserve
energy. Through the use of specifically designed control software for the PTAC industry Friedrich has accomplished
what other Manufacturer’s have only attempted – a quiet, dependable, affordable and easy to use PTAC.
Below is a list of standard features on every Friedrich PTAC and their benefit to the owner.
Digital Temperature
Readout
By digitally monitoring desired room temperature the room is controlled more precisely than conventional
systems. The large, easy to read LED display can show either set-point or actual room temperature as
selected by owner.
One-Touch
Operation
When the unit is powered off the unit can be returned directly to heating or cooling mode by pressing the
‘Heat’ or ‘Cool’ buttons without the confusing power up sequence of some controls. One-touch control
takes guess-work out of unit control delivering a more enjoyable experience and eliminating front-desk
calls.
Individual Mode and
Fan Control Buttons
By having separate control buttons and indicators for both fan and mode settings the Friedrich digital control eliminates the confusion of previous digital PTACs. The accurate temperature setting provides greater
guest comfort than other systems.
Quiet Start/Stop
Fan Delay
The fan start and stop delays prevent abrupt changes in room acoustics due to the compressor energizing
or stopping immediately. Upon call for cooling or heating the unit fan will run for five seconds prior to energizing the compressor. Also, the fan off delay allows for “free cooling” by utilizing the already cool indoor
coil to its maximum capacity by running for 30 seconds after the compressor.
Remote Thermostat
Operation
Some applications require the use of a wall mounted thermostat. All new Friedrich PTACs may be switched
from unit control to remote thermostat control easily without the need to order a special model or accessory kit.
Wireless Remote
Control Ready
Guests can adjust the temperature and mode of the unit through the use of an optional hand held wireless
remote, improving guest comfort and relaxation.
Internal Diagnostic
Program
The new Friedrich digital PTAC features a self diagnostic program that can alert maintenance to component failures or operating problems. The internal diagnostic program saves properties valuable time when
diagnosing running problems.
Service Error Code
Storage
The self diagnosis program will also store error codes in memory if certain conditions occur and correct
themselves such as extreme high or low operating conditions or activation of the room freeze protection
feature. Storing error codes can help properties determine if the unit faced obscure conditions or if an error
occurred and corrected itself.
Constant Comfort
Room Monitoring
The on-board processor monitors time between demand cycles (heat or cool) and will cycle the fan every
9 minutes to sample the room condition and determine if the desired conditions are met. This allows the
room to have similar benefi ts to a remote mounted stat without the complication or cost of a wall mounted
thermostat.
Electronic
Temperature
Limiting
By limiting the operating range the property can save energy by eliminating “max cool” or “max heat” situations common with older uncontrolled systems. The new electronic control allows owners to set operating
ranges for both heating and cooling independently of one another.
Room Freeze
Protection
When the PTAC senses that the indoor room temperature has fallen to 40°F the unit will cycle on high fan
and the electric strip heat to raise the room temperature to 46°F then cycle off again. This feature works
regardless of the mode selected and can be turned off. The control will also store the Room Freeze cycle
in the service code memory for retrieval at a later date. This feature ensures that unoccupied rooms do not
reach freezing levels where damage can occur to plumbing and fixtures.
Random
Compressor Restart
Multiple compressors starting at once can often cause electrical overloads and premature unit failure.
The random restart delay eliminates multiple units from starting at once following a power outage or initial
power up. The compressor delay will range from 180 to 240 seconds.
Digital Defrost
Thermostat
The new Friedrich PTAC uses a digital thermostat to accurately monitor the outdoor coil conditions to allow
the heat pump to run whenever conditions are correct. Running the PTAC in heat pump mode save energy
and reduces operating costs. The digital thermostat allows maximization of heat pump run time.
11
FRIEDRICH DIGITAL CONTROL FEATURES CONTINUED
12
Instant Heat
Heat Pump Mode
Heat pump models will automatically run the electric heater to quickly bring the room up to temperature
when initially energized, then return to heat pump mode. This ensures that the room is brought up to
temperature quickly without the usual delay associated with heat pump units.
Even Heat Monitoring
The digital control monitors indoor conditions to ensure that the room temperature is within five degrees
of the setpoint. If necessary the unit will cycle the electric heat to maintain the temperature. This feature
ensures guest comfort by delivering the heating benefits of an electric heater while maintaining the
efficiency benefits of a heat pump.
Fan Cycle Control
The owner may choose between fan cycling or fan continuous mode based on property preference. (Note:
Even heat monitoring and quiet start/stop fan delay only operate in fan cycle mode). Fan continuous
mode is used to keep constant airflow circulation in the room during all times the unit is ‘ON’. Fan cycle
will conserve energy by only operating the fan while the compressor or electric heater is operating.
Emergency Heat
Override
In the event of a compressor failure in heat pump mode the compressor may be locked out to provide
heat through the resistance heater. This feature ensures that even in the unlikely event of a compressor
failure the room temperature can be maintained until the compressor can be serviced.
Desk Control Ready
All Friedrich digital PTACs have low voltage terminals ready to connect a desk control energy management
system. Controlling the unit from a remote location like the front desk can reduce energy usage and
requires no additional accessories at the PTAC.
Indoor Coil Frost
Sensor
The frost sensor protects the compressor from damage in the event that airfl ow is reduced or low
outdoor temperatures cause the indoor coil to freeze. When the indoor coil reaches 30°F the compressor
is diabled and the fan continues to operate based on demand. Once the coil temperature returns to 45°F
the compressor returns to operation.
Ultra-Quiet Air System
The new Friedrich PD series units feature a indoor fan system design that reduces sound levels without
lowering airflow and preventing proper air circulation.
High Efficiency
The Friedrich PTAC benefits quality components and extensive development to ensure a quiet, efficient
and dependable unit.
Single Motor
Friedrich’s single-motor design allows for enhanced outdoor airflow and simplifies the unit design without
the need for redundant components.
Rotary Compressor
High efficiency rotary compressors are used on all Friedrich PTACs to maximize durability and
efficiency.
Auxiliary Fan Ready
The Friedrich PTAC features a 24V AC terminal for connection to an auxiliary fan that may be used to
transfer air to adjoining rooms. Auxiliary fans can provide conditioning to multiple rooms without the
requirement of multiple PTAC units.
Aluminum Endplates
All Friedrich PTACs are built with .04” endplates made from aluminum as opposed to steel. The endplates
are typically the most susceptible area for corrosion and aluminum is far more resistant to corrosion than
even coated steel.
Seacoast Protection
Optional Seacoast protection is available to protect the outdoor coil from harsh environments. The
Friedrich Seacoast process includes dipping the entire outdoor coil in a 7-step coating process that
provides superior protection to only coating the fins of the coil.
Top Mounted Antimicrobial Air Filters
All Friedrich PTAC return air filters feature an anti-microbial element that has proven to prevent mold
and bacterial growth in laboratory testing. PDXFT replacement filter kits feature the same anti-microbial
agent. All filters are washable and reusable and are easily accessed from the top of the unit without the
removal of the front cover.
Filtered Fresh Air
Intake
Friedrich PTAC units are capable of introducing up to 70 CFM of outside air into the conditioned space.
The outdoor air passes through a washable mesh fi lter to prevent debris from entering the airstream.
DIGITAL CONTROL OPERATION
Temperature Display
The Friedrich digital PTAC is shipped from the factory
to display the “Set Point” (desired room temperature) on the
LED readout.
The unit can be configured to display the room temperature
by simultaneously pressing the ‘Cool’ and ‘High Fan’ buttons
for three seconds. The display will show an ‘R’ for one second
to acknowledge the change. The unit will then display the “Set
Point” whenever the Temperature Up
or Temperature
Down
buttons are pressed, then switch back to display
actual room temperature.
To revert back to the factory setting displaying the “Set Point”
only, press the ‘Cool’ and ‘High Fan’ buttons simultaneously
for three seconds. The unit will display an ‘S’ for one second
to acknowledge the change.
Digital Control Panel
°F vs. °C Display
The unit is factory configured to display all temperatures in
degrees Fahrenheit (°F). To switch to degrees Celsius press
the ‘Fan Only’ and ‘Low Fan’ buttons simultaneously for three
seconds. The display will show a ‘C’ as acknowledgement of
the change.
To revert back to degrees Fahrenheit press the ‘Fan Only’
and ‘Low Fan’ buttons simultaneously for three seconds.
The display will show an ‘F’ as acknowledgement of the
change.
Cooling Mode
Pressing the ‘Cool’ button while the unit is in any mode,
including off, will put the unit into cooling mode. Adjust the
temperature readout to the desired room temperature and
the unit will cycle the compressor on and off to maintain a
comfortable room. The compressor will come on anytime that
the room temperature is 1.8°F above the desired temperature.
The fan operation is dependent on the fan mode selected,
either continuous or cycling.
Heating Mode
Pressing the ‘Heat’ button while the unit is in any mode,
including off, will put the unit into heating mode.
Heat Pump Models (PDH)
When the ‘Heat’ button is pressed initially the unit will energize
the electric resistance heat to quickly bring the room to the
set temperature. When the desired room temperature falls
1.8°F below the desired set temperature the unit will cycle
the compressor on and operate as a heat pump to maintain
the room temperature while running more efficiently than
resistance heat only models. If the room temperature should
fall more than 5°F from the set temperature the unit will run
the resistance heater. The fan operation is dependent on the
fan mode selected, either continuous or cycling. Dip switch 5
controls the fan mode, see “Dip Switch” setting elsewhere in
this manual.
When the outdoor coil temperature falls below 30°F for more
than 2 minutes the unit will operate the resistance heaters and
not the compressor. When the outdoor coil temperature reaches
45°F the compressor will be allowed to operate again.
Heat/Cool Models (PDE)
After pressing the ‘Heat’ button, adjust the temperature
readout to the desired room temperature and the unit will cycle
the resistance heat on and off to maintain a comfortable room.
The heater will come on anytime that the room temperature
is 1.8°F below the desired temperature. The fan operation is
dependent on the fan mode selected, either continuous or
cycling. Dip switch 5 controls the fan mode, see “Dip Switch”
setting elsewhere in the manual.
Emergency Heat Operation
In the event of a compressor failure in heat pump mode the
compressor may be locked out to provide heat through the
resistance heater. This feature ensures that even in the unlikely
event of a compressor failure the room temperature can be
maintained until the compressor can be serviced. Dip switch 7
controls the emergency heat setting, see “Dip Switch” setting
elsewhere in the manual.
Fan Mode
Fan Only
Pressing the ‘Fan Only’ button will run the fan to allow for
air circulation in the room without operating the compressor
or heater regardless of the room or set temperature. The fan
speed selection is made by pressing either the ‘High Fan’ or
‘Low Fan’ button.
Cycle/Continuous
The owner may choose between fan cycling or fan continuous
mode based on property preference. (Note: Even heat
monitoring and quiet start/stop fan delay only operate in fan
cycle mode). Fan continuous mode is used to keep constant
airflow circulation in the room during all times the unit is ‘ON’.
Fan cycle will conserve energy by only operating the fan while
the compressor or electric heater is operating. Dip switch 5
controls the fan mode, see “Dip Switch” setting elsewhere in
the manual.
13
DIGITAL CONTROL USER INPUT CONFIGURATION
The adjustable control dip switches are located at the lower left hand portion of the digital Smart Center. The inputs
are only visible and accessible with the front cover removed from the PTAC.
Dip Switch Setting
1) Electronic Temperature Limiting – Switches 1- 4
The digital control is set from the factory to allow a
temperature range between 60°F and 90°F in both heating
and cooling mode. Dip Switches 1-4 can be used to set high
and low limits for either heating or cooling or both.
From the factory all four switches are in the up ‘ON’ position. The
charts to the right show the available electronic limiting ranges.
Heating Range Switches 1 & 2
Dip
Switch
Temperature
Range
Low
High
1
2
60
90
On
On
60
87
Off
On
60
84
Off
Off
60
81
On
Off
2) Fan Cycle Control – Switch 5
All PTACs are shipped from the factory with Dip Switch 5 in the
‘OFF’ position to cycle the fan only when there is a demand for
the compressor or heater. As an option, the fan may be set to
‘continuous’ mode by switching Dip Switch 5 to ‘ON’ position
to run the fan continuously while the unit is powered on.
To ensure that the room temperature is maintained
evenly while in fan cycle mode the Even Temp Load
Anticipation feature is enabled. Quiet Fan Delay is also
enabled in fan cycle mode to lessen the acoustical change
between compressor start up and shut off by running the
fan for 5 seconds before each demand cycle, and 30
seconds after cooling or 15 seconds after heating cycles.
3) Room Freeze Protection – Switch 6
Units are shipped from the factory with the room freeze
protection disabled. Room Freeze Protection can be switched
on at the owner’s preference by moving Dip Switch 6 to ‘ON’.
This feature will monitor the indoor room conditions and in
the event that the room falls below 40°F the unit will cycle
on high fan with the electric heater. This occurs regardless
of mode.
Cooling Range Switches 3 & 4
Dip
Switch
Temperature
Range
Low
High
3
4
60
90
On
On
63
90
On
Off
66
90
Off
Off
69
90
Off
On
Factory Dip Switch Configuration
ON
DIP
1 2 3 4 5 6 7 8
4) Emergency Heat Override – Switch 7
In the unlikely event of a compressor failure a heat pump unit
may be switched to operate in only the electric heat mode
until repairs can be made. Moving Dip Switch 7 to ‘ON’.
Note: In order for the control to recognize “Dip” switch setting changes, the PTAC must be disconnected from
power supply when making any configuration changes.
14
Optional Hand Held Remote Control Operation
The electronic control can be configured to operate via an
optional hand held remote control for added convenience.
The PTAC control board comes shipped with all of the
necessary hardware to communicate to the PDXRC
remote control. In order to perate the unit with the remote
control, the remote control sensor must be enabled.
Simply press and hold the ‘Temp’
and
buttons
simultaneously for 3 seconds and the LED window will
display an “E” for confirmation that the remote is enabled.
To disable the feature press ‘Temp’
and
buttons
at the same time for 3 seconds. LED will display
an ‘0” as acknowledgement for 1 second.
The remote control is now ready for use. The temperature,
mode and fan speed control from the remote control will
operate the unite the same as the unit mounted controls.
NOTE: The hand held remote control cannot be
used in conjunction with a wall mounted thermostat.
Remote Control
Temperature
Warmer
Cooler
Cool
Power
Heat
Low
Fan
Fan
Only
High
Fan
Digital Control Diagnostics and Test Mode
Diagnostics
The Friedrich Smart Center continuously monitors
the PTAC unit operation and will store service codes if
certain conditions are witnessed. In some cases the unit
may take action and shut the unit off until conditions are
corrected.
To access the error code menu press the ‘Heat’ and
‘High Fan’ buttons simultaneously for three seconds. If
error codes are present they will be displayed. If multiple
codes exist you can toggle between messages using
the temp up
button. To clear all codes press the temp
down
button for three seconds while in the error code
mode. To exit without changing codes press the ‘Low Fan’
button.
Button Location with Optional PDXRT
Escutcheon Kit Installed
If the remote escutcheon kit is installed, the button locations to access the diagnostics and tests modes can be
located as shown below.
Cool
High fan
Heat
Power
Temp
Temp
Fan only
Low fan
15
Electronic Control Error Code Diagnostics
Error
Code
EF
02
03
04
05
06
Code Translation
Action Taken By Unit
Possible Cause
Error Free
None
Unit Operating Normally
Shut unit down. Flash error code.
When
An extreme low voltage condition exists <198V
voltage rises to adequate level normal unit
for 230V units and <239V for 265V units.
operation is restored.
Return air thermistor sensor open or
Leave unit running. Alternately flash error
short circuit
code and set point.
Indoor coil thermistor sensor open or
Leave unit running. Alternately flash
short circuit
error code and set point.
Leave unit running. Switch to Electric Heat
Outdoor coil thermistor sensor open
Mode (Heat Pump only). Alternately flash
or short circuit
error code and set point.
Outdoor coil Temperature > 175° F for
2 consecutive minutes. (Heat Pump
models only)
Shut unit down for 5 minutes, Alternately
flash error code and set point, then try again
2 times, if unit fails the 3rd time then shut
unit down and alternately flash error code
and set point.
Shut down Compressor, and continue fan
operation. Alternately flash error code and
set point until the indoor coil thermistor
reaches 45° F. Then, (after lockout time of
180 to 240 seconds expires), re-energize
the compressor .
Leave unit running. Store error code in
memory.
• Defective sensor
• Defective sensor
• Defective sensor
• Dirty coil
• Fan motor failure
• Restricted air flow
• Non-condensables in refrigeration sys
• Dirty filters
• Dirty coil
• Fan motor failure
• Restricted air flow
• Improper refrigerant charge
• Restriction in refrigerant circuit
07
Indoor coil temperature <30° F for 2
consecutive minutes.
08
Unit cycles (Heat or Cool demand) >
9 times per hour
09
Unit cycles (Heat or Cool demand) <
3 times per hour
10
Room Freeze Protection triggered
Leave unit running. Alternately flash error
code and set point.
11
No Signal to “GL or “GH” terminal
Shut unit down. Flash error code.
• Defective remote thermostat
• Defective thermostat wiring
12
Discharge air temperature >185° F
Shut down Compressor and/or Heater, and
energize high fan. Alternately flash error
code and set point. If condition repeats
three times in one hour, shut unit down.
• Restricted air flow
• Fan motor failure
13
Pressure switch jumper wire loose/missing
High Pressure switch open (If so equipped)
Shut unit down. Flash error code.
• Dirty coil
• Fan motor failure
• Restricted air flow
• Non-condensables in refrigeration system
14
Discharge air temperature sensor open or
shorted
Leave unit running. Alternately flash error
code and set point.
• Defective Sensor
Leave unit running. Store Error Code in
memory.
• Unit oversized
• Low load conditions
• Unit undersized
• High load conditions
• Room temperature fell below 40°F
Diagnostics
Test Mode
The Friedrich Smart Center continuously monitors
the PTAC unit operation and will store service codes if
certain conditions are witnessed. In some cases the unit
may take action and shut the unit off until conditions are
corrected.
For service and diagnostic use only, the built-in
timers and delays on the PTAC may be bypassed
by pressing the ‘Cool’ and ‘Low Fan’ buttons
simultaneously for three seconds while in any
mode to enter the test mode. CE will be displayed
when entering test mode, and OE will be displayed
when exiting. The test mode will automatically be
exited 30 minutes after entering it or by pressing
the ‘Cool’ and ‘Low Fan’ buttons simultaneously
for three seconds.
To access the error code menu press the ‘Heat’ and
‘High Fan’ buttons simultaneously for three seconds. If
error codes are present they will be displayed. If multiple
codes exist you can toggle between messages using
the temp
button. To clear all codes press the temp
button for three seconds while in the error code mode.
To exit without changing codes press the ‘Low Fan’ button.
EF = Error Free
16
• Inadequate power supply
• Defective breaker
• Blown fuse
Note:
To access the Test Mode while under remote wall
thermostat operation, remove thermostat’s wires
at the terminal block on the electronic control
board then connect a jumper wire between GL
and GH.
COMPONENTS TESTING
BLOWER / FAN MOTOR
A single phase permanent split capacitor motor is used to drive
the evaporator blower and condenser fan. A self-resetting
overload is located inside the motor to protect against high
temperature and high amperage conditions.
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
BLOWER / FAN MOTOR TEST
1. Make sure the motor has cooled down.
2. Disconnect the fan motor wires from the control board.
3. Test for continuity between the windings also, test to
ground.
4. If any winding is open or grounded replace the motor.
Capacitor Check with Capacitor Analyzer
The capacitor analyzer will show whether the capacitor
is “open” or “shorted.” It will tell whether the capacitor
is within its micro farads rating and it will show whether
the capacitor is operating at the proper power-factor
percentage. The instrument will automatically discharge
the capacitor when the test switch is released.
Capacitor Connections
The starting winding of a motor can be damaged by a
shorted and grounded running capacitor. This damage
usually can be avoided by proper connection of the running
capacitor terminals.
From the supply line on a typical 230 volt circuit, a 115 volt
potential exists from the “R” terminal to ground through a
possible short in the capacitor. However, from the “S” or start
terminal, a much higher potential, possibly as high as 400
volts, exists because of the counter EMF generated in the
start winding. Therefore, the possibility of capacitor failure
is much greater when the identified terminal is connected
to the “S” or start terminal. The identified terminal should
always be connected to the supply line, or “R” terminal,
never to the “S” terminal.
When connected properly, a shorted or grounded running
capacitor will result in a direct short to ground from the “R”
terminal and will blow the line fuse. The motor protector
will protect the main winding from excessive temperature.
CAPACITORS
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before servicing.
Discharge capacitor with a 20,000 Ohm 2 Watt
resistor before handling.
Failure to do so may result in personal injury,
or death.
Many motor capacitors are internally fused. Shorting the
terminals will blow the fuse, ruining the capacitor. A 20,000
ohm 2 watt resistor can be used to discharge capacitors
safely. Remove wires from capacitor and place resistor
across terminals. When checking a dual capacitor with
a capacitor analyzer or ohmmeter, both sides must be
tested.
17
COMPONENTS TESTING (Continued)
HEATER ELEMENTS AND LIMIT SWITCHES’
SPECIFICATIONS
All heat pumps and electric heat models are equipped
with a heating element and a limit switch (bimetal thermostat). The limit is in series with the element and will
interrupt the power at a designed temperature.
Should the blower motor fail, filter become clogged or airflow be restricted etc., the high limit switch will open and
interrupt the power to the heater before reaching an unsafe temperature condition.
TESTING THE HEATING ELEMENTS AND
LIMIT SWITCHES
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
Testing of the heating elements can be made with an
ohmmeter or continuity tester across the terminals after
the power wires have been removed. Test the limit switch
for continuity across its input and output terminals.Test
below the limit switch’s reset temperature.
18
DRAIN PAN VALVE
During the cooling mode of operation, condensate which
collects in the drain pan is picked up by the condenser fan
blade and sprayed onto the condenser coil. This assists
in cooling the refrigerant plus evaporating the water.
During the heating mode of operation, it is necessary that
water be removed to prevent it from freezing during cold
outside temperatures. This could cause the condenser
fan blade to freeze in the accumulated water and prevent
it from turning.
To provide a means of draining this water, a bellows type
drain valve is installed over a drain opening in the base
pan.
This valve is temperature sensitive and will open when
the outside temperature reaches 40°F. The valve will
close gradually as the temperature rises above 40°F to
fully close at 60°F.
Bellows Assembly
Drain Pan Valve
REFRIGERATION SEQUENCE OF OPERATION
A good understanding of the basic operation of the
refrigeration system is essential for the service technician.
Without this understanding, accurate troubleshooting of
refrigeration system problems will be more difficult and time
consuming, if not (in some cases) entirely impossible. The
refrigeration system uses four basic principles (laws) in its
operation they are as follows:
1. “Heat always flows from a warmer body to a cooler
body.”
2. “Heat must be added to or removed from a substance
before a change in state can occur”
3. “Flow is always from a higher pressure area to a lower
pressure area.”
4. “The temperature at which a liquid or gas changes state
is dependent upon the pressure.”
The refrigeration cycle begins at the compressor. Starting
the compressor creates a low pressure in the suction line
which draws refrigerant gas (vapor) into the compressor.
The compressor then “compresses” this refrigerant, raising
its pressure and its (heat intensity) temperature.
The refrigerant leaves the compressor through the discharge
Line as a hot High pressure gas (vapor). The refrigerant
enters the condenser coil where it gives up some of its
heat. The condenser fan moving air across the coil’s finned
surface facilitates the transfer of heat from the refrigerant to
the relatively cooler outdoor air.
The refrigerant leaves the condenser Coil through the liquid
line as a warm high pressure liquid. It next will pass through
the refrigerant drier (if so equipped). It is the function of the
drier to trap any moisture present in the system, contaminants,
and large particulate matter.
The liquid refrigerant next enters the metering device. The
metering device is a capillary tube. The purpose of the
metering device is to “meter” (i.e. control or measure) the
quantity of refrigerant entering the evaporator coil.
In the case of the capillary tube this is accomplished (by
design) through size (and length) of device, and the pressure
difference present across the device.
Since the evaporator coil is under a lower pressure (due to
the suction created by the compressor) than the liquid line,
the liquid refrigerant leaves the metering device entering the
evaporator coil. As it enters the evaporator coil, the larger
area and lower pressure allows the refrigerant to expand
and lower its temperature (heat intensity). This expansion is
often referred to as “boiling”. Since the unit’s blower is moving
indoor air across the finned surface of the evaporator coil,
the expanding refrigerant absorbs some of that heat. This
results in a lowering of the indoor air temperature, hence the
“cooling” effect.
The expansion and absorbing of heat cause the liquid
refrigerant to evaporate (i.e. change to a gas). Once the
refrigerant has been evaporated (changed to a gas), it is
heated even further by the air that continues to flow across
the evaporator coil.
When a sufficient quantity of heat has been removed from
the refrigerant gas (vapor), the refrigerant will “condense”
(i.e. change to a liquid). Once the refrigerant has been
condensed (changed) to a liquid it is cooled even further by
the air that continues to flow across the condenser coil.
The particular system design determines at exactly what
point (in the evaporator) the change of state (i.e. liquid to a
gas) takes place. In all cases, however, the refrigerant must
be totally evaporated (changed) to a gas before leaving the
evaporator coil.
The PTAC design determines at exactly what point (in
the condenser) the change of state (i.e. gas to a liquid)
takes place. In all cases, however, the refrigerant must be
totally condensed (changed) to a Liquid before leaving the
condenser coil.
The low pressure (suction) created by the compressor
causes the refrigerant to leave the evaporator through the
suction line as a cool low pressure vapor. The refrigerant then
returns to the compressor, where the cycle is repeated.
Suction
Line
Evaporator
Coil
Metering
Device
Refrigerant
Strainer
Discharge
Line
Condenser
Coil
Compressor
Refrigerant Drier Liquid
Line
19
R-410A SEALED REFRIGERATION SYSTEM REPAIRS
IMPORTANT
SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.
SEALED SYSTEM REPAIRS TO HEAT PUMP MODELS REQUIRE THE INSTALLATION OF A SUCTION LINE DRIER.
EQUIPMENT REQUIRED:
1. Voltmeter
9.
2. Ammeter
10. Low Pressure Gauge - (30 - 200 lbs.)
3. Ohmmeter
11. Vacuum Gauge - (0 - 1000 microns)
4. E.P.A. Approved Refrigerant Recovery System
5. Vacuum Pump (capable of 200 microns or less
vacuum.)
6. Acetylene Welder
12. Facilities for flowing nitrogen through refrigeration tubing
during all brazing processes.
EQUIPMENT MUST BE CAPABLE OF:
1. Recovering refrigerant to EPA required levels.
7. Electronic Halogen Leak Detector capable of detecting HFC (Hydrofluorocarbon) refrigerants.
8. Accurate refrigerant charge measuring device such
as:
a. Balance Scales - 1/2 oz. accuracy
b. Charging Board - 1/2 oz. accuracy
WARNING
RISK OF ELECTRIC SHOCK
Unplug and/or disconnect all electrical power
to the unit before performing inspections,
maintenances or service.
Failure to do so could result in electric shock,
serious injury or death.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
Refrigerant Charging
Proper refrigerant charge is essential to proper unit operation. Operating a unit with an improper refrigerant charge will
result in reduced performance (capacity) and/or efficiency.
Accordingly, the use of proper charging methods during servicing will insure that the unit is functioning as designed and
that its compressor will not be damaged.
20
High Pressure Gauge - (0 - 750 lbs.)
2. Evacuation from both the high side and low side of the
system simultaneously.
3. Introducing refrigerant charge into high side of the
system.
4. Accurately weighing the refrigerant charge introduced
into the system.
Too much refrigerant (overcharge) in the system is just as bad
(if not worse) than not enough refrigerant (undercharge). They
both can be the source of certain compressor failures if they
remain uncorrected for any period of time. Quite often, other
problems (such as low air flow across evaporator, etc.) are
misdiagnosed as refrigerant charge problems. The refrigerant
circuit diagnosis chart will assist you in properly diagnosing
these systems.
An overcharged unit will at times return liquid refrigerant
(slugging) back to the suction side of the compressor eventually
causing a mechanical failure within the compressor. This
mechanical failure can manifest itself as valve failure, bearing
failure, and/or other mechanical failure. The specific type of
failure will be influenced by the amount of liquid being returned,
and the length of time the slugging continues.
Not enough refrigerant (undercharge) on the other hand, will
cause the temperature of the suction gas to increase to the point
where it does not provide sufficient cooling for the compressor
motor. When this occurs, the motor winding temperature will
increase causing the motor to overheat and possibly cycle open
the compressor overload protector. Continued overheating of
the motor windings and/or cycling of the overload will eventually
lead to compressor motor or overload failure.
Method Of Charging / Repairs
The acceptable method for charging the RAC system is the
Weighed in Charge Method. The weighed in charge method is
applicable to all units. It is the preferred method to use, as it is
the most accurate.
The weighed in method should always be used whenever
a charge is removed from a unit such as for a leak repair,
compressor replacement, or when there is no refrigerant
charge left in the unit. To charge by this method, requires the
following steps:
1. Install a piercing valve to remove refrigerant from the
sealedsystem. (Piercing valve must be removed from the
system before recharging.)
2. Recover Refrigerant in accordance with EPA regulations.
WARNING
BURN HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with a torch.
Failure to follow these procedures could
result in moderate or serious injury.
3. Install a process tube to sealed system.
CAUTION
FREEZE HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with liquid refrigerant.
Failure to follow these procedures could
result in minor to moderate injury.
4. Make necessary repairs to system.
5. Evacuate system to 200 microns or less.
6. Weigh in refrigerant with the property quantity of R-410A
refrigerant.
7. Start unit, and verify performance.
WARNING
BURN HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with a torch.
Failure to follow these procedures could
result in moderate or serious injury.
8. Crimp the process tube and solder the end shut.
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
Extreme care must be used, if it becomes
necessary to work on equipment with power
applied.
Failure to do so could result in serious injury or
death.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
Undercharged Refrigerant Systems
An undercharged system will result in poor performance
(low pressures, etc.) in both the heating and cooling
cycle.
Whenever you service a unit with an undercharge of
refrigerant, always suspect a leak. The leak must be
repaired before charging the unit.
To check for an undercharged system, turn the unit on,
allow the compressor to run long enough to establish
working pressures in the system (15 to 20 minutes).
During the cooling cycle you can listen carefully at the exit
of the metering device into the evaporator; an intermittent
hissing and gurgling sound indicates a low refrigerant
charge. Intermittent frosting and thawing of the evaporator
is another indication of a low charge, however, frosting
and thawing can also be caused by insufficient air over
the evaporator.
Checks for an undercharged system can be made at
the compressor. If the compressor seems quieter than
normal, it is an indication of a low refrigerant charge.
A check of the amperage drawn by the compressor
motor should show a lower reading. (Check the Unit
Specification.)
21
After the unit has run 10 to 15 minutes, check the gauge
pressures. Gauges connected to system with an undercharge
will have low head pressures and substantially low suction
pressures.
Improper air flow over the evaporator coil may indicate
some of the same symptoms as an over charged system.
An overcharge can cause the compressor to fail, since it
would be “slugged” with liquid refrigerant.
The charge for any system is critical. When the compressor
is noisy, suspect an overcharge, when you are sure that the
air quantity over the evaporator coil is correct. Icing of the
evaporator will not be encountered because the refrigerant
will boil later if at all. Gauges connected to system will usually
have higher head pressure (depending upon amount of over
charge). Suction pressure should be slightly higher.
Overcharged Refrigerant Systems
Compressor amps will be near normal or higher.
Noncondensables can also cause these symptoms. To
confirm, remove some of the charge, if conditions improve,
system may be overcharged. If conditions don’t improve,
Noncondensables are indicated.
Whenever an overcharged system is indicated, always make
sure that the problem is not caused by air flow problems.
Restricted Refrigerant System
Troubleshooting a restricted refrigerant system can be
difficult. The following procedures are the more common
problems and solutions to these problems. There are two
types of refrigerant restrictions: Partial restrictions and
complete restrictions.
A partial restriction allows some of the refrigerant to
circulate through the system.
With a complete restriction there is no circulation of
refrigerant in the system.
Restricted refrigerant systems display the same symptoms
as a “low-charge condition.”
When the unit is shut off, the gauges may equalize very
slowly.
Gauges connected to a completely restricted system will
run in a deep vacuum. When the unit is shut off, the gauges
will not equalize at all.
A quick check for either condition begins at the evaporator.
With a partial restriction, there may be gurgling sounds
at the metering device entrance to the evaporator. The
evaporator in a partial restriction could be partially frosted
or have an ice ball close to the entrance of the metering
device. Frost may continue on the suction line back to the
compressor.
Often a partial restriction of any type can be found by feel,
as there is a temperature difference from one side of the
restriction to the other.
22
With a complete restriction, there will be no sound at the
metering device entrance. An amperage check of the
compressor with a partial restriction may show normal
current when compared to the unit specification.
With a complete restriction the current drawn may be
considerably less than normal, as the compressor is
running in a deep vacuum (no load.) Much of the area of
the condenser will be relatively cool since most or all of the
liquid refrigerant will be stored there.
The following conditions are based primarily on a system
in the cooling mode.
HERMETIC COMPONENTS CHECK
WARNING
WARNING
BURN HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with a torch.
CUT/SEVER HAZARD
Be careful with the sharp edges and corners.
Wear protective clothing and gloves, etc.
Failure to follow these procedures could
result in moderate or serious injury.
Failure to do so could result in serious injury.
METERING DEVICE
Capillary Tube Systems
All units are equipped with capillary tube metering
devices.
3.
Switch the unit to the heating mode and observe the
gauge readings after a few minutes running time. If
the system pressure is lower than normal, the heating
capillary is restricted.
4.
If the operating pressures are lower than normal in both
the heating and cooling mode, the cooling capillary is
restricted.
Checking for restricted capillary tubes.
1. Connect pressure gauges to unit.
2. Start the unit in the cooling mode. If after a few minutes
of operation the pressures are normal, the check valve
and the cooling capillary are not restricted.
CHECK VALVE
A unique two-way check valve is used on the reverse cycle
heat pumps. It is pressure operated and used to direct the
flow of refrigerant through a single filter drier and to the
proper capillary tube during either the heating or cooling
cycle.
One-way Check Valve
(Heat Pump Models)
NOTE: The slide (check) inside the valve is made of teflon.
Should it become necessary to replace the check valve,
place a wet cloth around the valve to prevent overheating
during the brazing operation.
CHECK VALVE OPERATION
In the cooling mode of operation, high pressure liquid enters
the check valve forcing the slide to close the opposite port
(liquid line) to the indoor coil. Refer to refrigerant flow chart.
This directs the refrigerant through the filter drier and cooling
capillary tube to the indoor coil.
In the heating mode of operation, high pressure refrigerant
enters the check valve from the opposite direction, closing
the port (liquid line) to the outdoor coil. The flow path of
the refrigerant is then through the filter drier and heating
capillary to the outdoor coil.
Failure of the slide in the check valve to seat properly in
either mode of operation will cause flooding of the cooling
coil. This is due to the refrigerant bypassing the heating or
cooling capillary tube and entering the liquid line.
COOLING MODE
In the cooling mode of operation, liquid refrigerant from
condenser (liquid line) enters the cooling check valve
forcing the heating check valve shut. The liquid refrigerant
is directed into the liquid dryer after which the refrigerant
is metered through cooling capillary tubes to evaporator.
(Note: liquid refrigerant will also be directed through the
heating capillary tubes in a continuous loop during the
cooling mode).
HEATING MODE
In the heating mode of operation, liquid refrigerant from
the indoor coil enters the heating check valve forcing the
cooling check valve shut. The liquid refrigerant is directed
into the liquid dryer after which the refrigerant is metered
through the heating capillary tubes to outdoor coils. (Note:
liquid refrigerant will also be directed through the cooling
capillary tubes in a continuous loop during the heating
mode).
23
REVERSING VALVE DESCRIPTION/OPERATION
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before servicing.
Failure to follow this warning could result in
serious injury or death.
of the system. The pilot section of the valve opens and
closes ports for the small capillary tubes to the main valve
to cause it to shift.
NOTE: System operating pressures must be near
normal before valve can shift.
The Reversing Valve controls the direction of refrigerant flow
to the indoor and outdoor coils. It consists of a pressureoperated, main valve and a pilot valve actuated by a solenoid
plunger. The solenoid is energized during the heating cycle
only. The reversing valves used in the PTAC system is a
2-position, 4-way valve.
The single tube on one side of the main valve body is the
high-pressure inlet to the valve from the compressor. The
center tube on the opposite side is connected to the low
pressure (suction) side of the system. The other two are
connected to the indoor and outdoor coils. Small capillary
tubes connect each end of the main valve cylinder to the “A”
and “B” ports of the pilot valve. A third capillary is a common
return line from these ports to the suction tube on the main
valve body. Four-way reversing valves also have a capillary
tube from the compressor discharge tube to the pilot valve.
The piston assembly in the main valve can only be shifted
by the pressure differential between the high and low sides
TESTING THE COIL
WARNING
ELECTRIC SHOCK HAZARD
Unplug and/or disconnect all electrical power
to the unit before performing inspections,
maintenances or service.
Failure to do so could result in electric shock,
serious injury or death.
The solenoid coil is an electromagnetic type coil mounted
on the reversing valve and is energized during the
operation of the compressor in the heating cycle.
1. Turn off high voltage electrical power to unit.
2. Unplug line voltage lead from reversing valve coil.
3. Check for electrical continuity through the coil. If you
do not have continuity replace the coil.
4. Check from each lead of coil to the copper liquid line
as it leaves the unit or the ground lug. There should
be no continuity between either of the coil leads
and ground; if there is, coil is grounded and must be
replaced.
5. If coil tests okay, reconnect the electrical leads.
6. Make sure coil has been assembled correctly.
24
NOTE: Do not start unit with solenoid coil removed from
valve, or do not remove coil after unit is in operation. This
will cause the coil to burn out.
CHECKING THE REVERSING VALVE
NOTE: You must have normal operating pressures before
the reversing valve can shift.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
Check the operation of the valve by starting the system
and switching the operation from “Cooling” to “Heating”
and then back to “Cooling”. Do not hammer on valve.
Occasionally, the reversing valve may stick in the heating
or cooling position or in the mid-position.
When sluggish or stuck in the mid-position, part of the
discharge gas from the compressor is directed back to the
suction side, resulting in excessively high suction pressure.
Touch Test in Heating/Cooling Cycle
WARNING
Should the valve fail to shift from coooling to heating,
block the air flow through the outdoor coil and allow the
discharge pressure to build in the system. Then switch the
system from heating to cooling.
BURN HAZARD
Certain unit components operate at
temperatures hot enough to cause burns.
Proper safety procedures must be followed,
and proper protective clothing must be
worn.
If the valve is stuck in the heating position, block the air
flow through the indoor coil and allow discharge pressure
to build in the system. Then switch the system from heating
to cooling.
Should the valve fail to shift in either position after increasing
the discharge pressure, replace the valve.
Dented or damaged valve body or capillary tubes can
prevent the main slide in the valve body from shifting.
If you determing this is the problem, replace the reversing
valve.
After all of the previous inspections and checks have been
made and determined correct, then perform the “Touch
Test” on the reversing valve.
Failure to follow these procedures could
result in minor to moderate injury.
The only definite indications that the slide is in the midposition is if all three tubes on the suction side of the valve
are hot after a few minutes of running time.
NOTE: A condition other than those illustrated above, and
on Page 31, indicate that the reversing valve is not shifting
properly. Both tubes shown as hot or cool must be the same
corresponding temperature.
Procedure For Changing Reversing Valve
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
NOTICE
FIRE HAZARD
The use of a torch requires extreme care and proper
judgment. Follow all safety recommended precautions
and protect surrounding areas with fire proof materials.
Have a fire extinguisher readily available. Failure to follow
this notice could result in moderate to serious property
damage.
Reversing Valve in Heating Mode
Reversing Valve in Cooling Mode
1.
Install Process Tubes. Recover refrigerant from sealed
system. PROPER HANDLING OF RECOVERED
REFRIGERANT ACCORDING TO EPA REGULATIONS
IS REQUIRED.
2.
Remove solenoid coil from reversing valve. If coil is to
be reused, protect from heat while changing valve.
3.
Unbraze all lines from reversing valve.
4.
Clean all excess braze from all tubing so that they will
slip into fittings on new valve.
5.
Remove solenoid coil from new valve.
25
6.
7.
Protect new valve body from heat while brazing with plastic
heat sink (Thermo Trap) or wrap valve body with wet
rag.
Fit all lines into new valve and braze lines into new
valve.
WARNING
EXPLOSION HAZARD
The use of nitrogen requires a pressure
regulator. Follow all safety procedures and
wear protective safety clothing etc.
Failure to follow proper safety procedures
could result in serious injury or death.
8.
9.
Pressurize sealed system with a combination of R-22
and nitrogen and check for leaks, using a suitable leak
detector. Recover refrigerant per EPA guidelines.
Once the sealed system is leak free, install solenoid coil
on new valve and charge the sealed system by weighing
in the proper amount and type of refrigerant as shown
on rating plate. Crimp the process tubes and solder the
ends shut. Do not leave Schrader or piercing valves in
the sealed system.
NOTE: When brazing a reversing valve into the system, it is
of extreme importance that the temperature of the valve does
not exceed 250°F at any time.
Wrap the reversing valve with a large rag saturated with
water. “Re-wet” the rag and thoroughly cool the valve after
each brazing operation of the four joints involved.
The wet rag around the reversing valve will eliminate
conduction of heat to the valve body when brazing the line
connection.
COMPRESSOR CHECKS
Determine L.R.V.
Start the compressor with the volt meter attached; then stop
the unit. Attempt to restart the compressor within a couple
of seconds and immediately read the voltage on the meter.
The compressor under these conditions will not start and will
usually kick out on overload within a few seconds since the
pressures in the system will not have had time to equalize.
Voltage should be at or above minimum voltage of 197 VAC,
as specified on the rating plate. If less than minimum, check
for cause of inadequate power supply; i.e., incorrect wire
size, loose electrical connections, etc.
Amperage (L.R.A.) Test
The running amperage of the compressor is the most important of these readings. A running amperage higher than that
indicated in the performance data indicates that a problem
exists mechanically or electrically.
Single Phase Running and L.R.A. Test
NOTE: Consult the specification and performance section
for running amperage. The L.R.A. can also be found on the
rating plate.
Select the proper amperage scale and clamp the meter
probe around the wire to the “C” terminal of the compressor.
Turn on the unit and read the running amperage on the meter. If the compressor does not start, the reading will indicate
the locked rotor amperage (L.R.A.).
Overloads
The compressor is equipped with an external overload which
senses both motor amperage and winding temperature. High
motor temperature or amperage heats the overload causing it
to open, breaking the common circuit within the compressor.
Heat generated within the compressor shell, usually due to
recycling of the motor, is slow to dissipate. It may take anywhere from a few minutes to several hours for the overload
to reset.
Checking the Overload
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or
death.
Locked Rotor Voltage (L.R.V.) Test
Locked rotor voltage (L.R.V.) is the actual voltage available
at the compressor under a stalled condition.
Single Phase Connections
Disconnect power from unit. Using a voltmeter, attach one
lead of the meter to the run “R” terminal on the compressor
and the other lead to the common “C” terminal of the compressor. Restore power to unit.
26
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment
with power applied.
Failure to do so could result in serious injury or
death.
WARNING
BURN HAZARD
Certain unit components operate at
temperatures hot enough to cause burns.
Proper safety procedures must be followed,
and proper protective clothing must be
worn.
In a single phase PSC compressor motor, the highest
value will be from the start to the run connections (“S” to
“R”). The next highest resistance is from the start to the
common connections (“S” to “C”). The lowest resistance
is from the run to common. (“C” to “R”) Before replacing a
compressor, check to be sure it is defective.
Failure to follow this warning could result
in moderate to serious injury.
External Overload
With power off, remove the leads from compressor terminals. If the compressor is hot, allow the overload to cool
before starting check. Using an ohmmeter, test continuity across the terminals of the external overload. If you
do not have continuity; this indicates that the overload is
open and must be replaced.
GROUND TEST
Use an ohmmeter set on its highest scale. Touch one
lead to the compressor body (clean point of contact as a
good connection is a must) and the other probe in turn
to each compressor terminal. If a reading is obtained the
compressor is grounded and must be replaced.
Check the complete electrical system to the compressor
and compressor internal electrical system, check to be
certain that compressor is not out on internal overload.
Single Phase Resistance Test
WARNING
Complete evaluation of the system must be made whenever
you suspect the compressor is defective. If the compressor
has been operating for sometime, a careful examination
must be made to determine why the compressor failed.
Many compressor failures are caused by the following
conditions:
1.
Improper air flow over the evaporator.
2.
Overcharged refrigerant system causing liquid to be
returned to the compressor.
3.
Restricted refrigerant system.
4.
Lack of lubrication.
Remove the leads from the compressor terminals and set
the ohmmeter on the lowest scale (R x 1).
5.
Liquid refrigerant returning to compressor causing oil
to be washed out of bearings.
Touch the leads of the ohmmeter from terminals common
to start (“C” to “S”). Next, touch the leads of the ohmmeter
from terminals common to run (“C” to “R”).
6.
Noncondensables such as air and moisture in
the system. Moisture is extremely destructive to a
refrigerant system.
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment
with power applied.
Failure to do so could result in serious injury or
death.
Add values “C” to “S” and “C” to “R” together and
check resistance from start to run terminals (“S” to “R”).
Resistance “S” to “R” should equal the total of “C” to “S”
and “C” to “R.”
27
COMPRESSOR REPLACEMENT
Recommended procedure for compressor
replacement
3.
After all refrigerant has been recovered, disconnect
suction and discharge lines from the compressor and
remove compressor. Be certain to have both suction
and discharge process tubes open to atmosphere.
4.
Carefully pour a small amount of oil from the suction
stub of the defective compressor into a clean
container.
5.
Using an acid test kit (one shot or conventional kit), test
the oil for acid content according to the instructions
with the kit.
6.
If any evidence of a burnout is found, no matter how
slight, the system will need to be cleaned up following
proper procedures.
7.
Install the replacement compressor.
WARNING
RISK OF ELECTRIC SHOCK
Unplug and/or disconnect all electrical power
to the unit before performing inspections,
maintenances or service.
Failure to do so could result in electric shock,
serious injury or death.
1.
Be certain to perform all necessary electrical and
refrigeration tests to be sure the compressor is
actually defective before replacing.
WARNING
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
EXPLOSION HAZARD
The use of nitrogen requires a pressure
regulator. Follow all safety procedures and
wear protective safety clothing etc.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
2.
Recover all refrigerant from the system though
the process tubes. PROPER HANDLING OF
RECOVERED REFRIGERANT ACCORDING TO
EPA REGULATIONS IS REQUIRED. Do not use
gauge manifold for this purpose if there has been
a burnout. You will contaminate your manifold and
hoses. Use a Schrader valve adapter and copper
tubing for burnout failures.
Failure to follow proper safety procedures
result in serious injury or death.
8. Pressurize with a combination of R-410A and nitrogen
and leak test all connections with leak detector capable of
detecting HFC (Hydrofluorocarbon) refrigerant. Recover
refrigerant/nitrogen mixture and repair any leaks found.
Repeat Step 8 to insure no more leaks are present.
9.
WARNING
CAUTION
HIGH TEMPERATURES
Extreme care, proper judgment and all safety
procedures must be followed when testing,
troubleshooting, handling or working around
unit while in operation with high temperature
components. Wear protective safety aids
such as: gloves, clothing etc.
Failure to do so could result in serious burn
injury.
NOTICE
FIRE HAZARD
The use of a torch requires extreme care and proper
judgment. Follow all safety recommended precautions
and protect surrounding areas with fire proof materials.
Have a fire extinguisher readily available. Failure to follow
this notice could result in moderate to serious property
damage.
28
Evacuate the system with a good vacuum pump capable
of a final vacuum of 200 microns or less. The system
should be evacuated through both liquid line and suction
line gauge ports. While the unit is being evacuated, seal
all openings on the defective compressor.
FREEZE HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with liquid refrigerant.
Failure to follow these procedures could
result in minor to moderate injury.
10.
Recharge the system with the correct amount of
refrigerant. The proper refrigerant charge will be
found on the unit rating plate. The use of an accurate
measuring device, such as a charging cylinder,
electronic scales or similar device is necessary.
NOTICE
NEVER, under any circumstances, charge a rotary
compressor through the LOW side. Doing so would
cause permanent damage to the new compressor.
SPECIAL PROCEDURE IN THE CASE OF MOTOR
COMPRESSOR BURNOUT
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
Failure to do so may result in personal injury,
or death.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
WARNING
EXPLOSION HAZARD
The use of nitrogen requires a pressure
regulator. Follow all safety procedures and
wear protective safety clothing etc.
Failure to follow proper safety procedures
result in serious injury or death.
1. Recover all refrigerant and oil from the system.
2. Remove compressor, capillary tube and filter drier
from the system.
3. Flush evaporator condenser and all connecting
tubing with dry nitrogen or equivalent. Use approved
flushing agent to remove all contamination from
system. Inspect suction and discharge line for
carbon deposits. Remove and clean if necessary.
Ensure all acid is neutralized.
4. Reassemble the system, including new drier strainer
and capillary tube.
5. Proceed with step 8-10 on previous page.
ROUTINE MAINTENANCE
WARNING
ELECTRICAL SHOCK HAZARD!
Turn off electrical power before service or
installation. All eletrical connections and wiring
MUST be installed by a qualified electrician
and conform to the National Code and all local
codes which have jurisdiction. Failure to do so
can result in property damage, personal injury
and/or death.
To ensure proper unit operation and life expectancy, the
following maintenance procedures should be performed
on a regular basis
1. Air Filter
To ensure proper unit operation, the air filters should
be cleaned at least monthly, and more frequently if
conditions warrant. The unit must be turned off before
the filters are cleaned.
To remove the air filters, grasp the top of the filter and lift
out of the front cabinet. Reverse the procedure to reinstall
the filters.
Clean the filters with a mild detergent in warm water, and
allow them to dry thoroughly before reinstalling.
2. Coils & Chassis
NOTE: Do not use a caustic coil cleaning agent on coils
or base pan. Use a biodegradable cleaning agent and
degreaser. The use of harsh cleaning materials may
lead to deterioration of the aluminum fins or the coil end
plates.
The indoor coil and outdoor coils and base pan should
be inspected periodically (annually or semi-annually)
and cleaned of all debris (lint, dirt, leaves, paper, etc.)
as necessary. Under extreme conditions, more frequent
cleaning may be required. Clean the coils and base
pan with a soft brush and compressed air or vacuum.
A pressure washer may also be used, however, you
must be careful not to bend the aluminum fin pack. Use
a sweeping up and down motion in the direction of the
vertical aluminum fin pack when pressure cleaning coils.
Note: It is extremely important to insure that none of the
electrical and/or electronic parts of the unit get wet. Be
sure to cover all electrical components to protect them
from water or spray.
3. Decorative Front
The decorative front and discharge air grille may be
cleaned with a mild soap or detergent. Do NOT use
solvents or hydrocarbon based cleaners such as
acetone, naphtha, gasoline, benzene, etc., to clean the
decorative front or air discharge grilles.
Use a damp (not wet) cloth when cleaning the control
area to prevent water from entering the unit, and possibly
damaging the electronic control
4. Fan Motor & Compressor
The fan motor & compressor and are permanently
lubricated, and require no additional lubrication.
5. Wall Sleeve
Inspect the inside of the wall sleeve and drain system
periodically (annually or semi-annually) and clean as
required. Under extreme conditions, more frequent
cleaning may be necessary. Clean both of these areas
with an antibacterial and antifungal cleaner. Rinse both
items thoroughly with water and ensure that the drain
outlets are operating properly.
29
TROUBLESHOOTING CHART - COOLING
REFRIGERANT SYSTEM DIAGNOSIS COOLING
PROBLEM
LOW SUCTION PRESSURE
PROBLEM
PROBLEM
PROBLEM
HIGH SUCTION PRESSURE
LOW HEAD PRESSURE
HIGH HEAD PRESSURE
High Load Conditions
Low Load Conditions
High Load Conditions
Low Load Conditions
Low Air Flow Across
Indoor Coil
High Air Flow Across
Indoor Coil
Refrigerant System
Restriction
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Undercharged
Overcharged
Moisture in System
Defective Compressor
Low Air Flow Across
Outdoor Coil
Reversing Valve not
Fully Seated
Undercharged System
Overcharged
Non-Condensables (air)
Defective Compressor
TROUBLESHOOTING CHART - HEATING
REFRIGERANT SYSTEM DIAGNOSIS HEATING
PROBLEM
LOW SUCTION PRESSURE
Low Air Flow Across
Outdoor Coil
HIGH SUCTION PRESSURE
Outdoor Ambient Too High
for Operation in Heating
PROBLEM
LOW HEAD PRESSURE
PROBLEM
HIGH HEAD PRESSURE
Refrigerant System
Restriction
Outdoor Ambient Too High
For Operation In Heating
Low Air Flow Across
Indoor Coil
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Reversing Valve not
Fully Seated
Undercharged
Overcharged
Undercharged
Overcharged
Defective Compressor
Non-Condensables (air)
in System
Moisture in System
30
PROBLEM
Defective Compressor
ELECTRICAL TROUBLESHOOTING CHART - HEAT PUMP
CAUTION
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
BURN HAZARD
Certain unit components operate at
temperatures hot enough to cause burns.
Extreme care must be used, if it becomes
necessary to work on equipment with power
applied.
Proper safety procedures must be followed,
and proper protective clothing must be
worn.
Failure to do so could result in serious injury
or death.
Failure to do so could result in minor to
moderate injury.
HEAT PUMP
SYSTEM COOLS WHEN
HEATING IS DESIRED.
Is Line Voltage
Present at the
Solenoid Valve?
NO
Is the Selector Switch
Set for Heat?
YES
Is the Solenoid Coil Good?
NO
Replace the Solenoid Coil
YES
Reversing Valve Stuck
Replace the Reversing Valve
31
WIRING DIAGRAM INDEX
Wiring Diagram
Page
PDE07
PDE07K2SE-A
PDE07K3SE-A
PDE07R2SE-A
PDE07R3SE-A
921-401-00
921-401-00
921-401-00
921-401-00
37
37
37
37
PDE09
PDE09K0SE-A
PDE09K2SE-A
PDE09K3SE-A
PDE09R2SE-A
PDE09R3SE-A
921-401-00
921-401-00
921-401-00
921-401-00
921-401-00
37
37
37
37
37
Model
32
PDE12
PDE12K0SE-A
PDE12K2SE-A
PDE12K3SE-A
PDE12K5SE-A
PDE12R2SE-A
PDE12R3SE-A
PDE12R5SE-A
921-401-00
921-401-00
921-401-00
921-401-00
921-401-00
921-401-00
921-401-00
37
37
37
37
37
37
37
PDE15
PDE15K0SE-A
PDE15K3SE-A
PDE15K5SE-A
PDE15R3SE-A
PDE15R5SE-A
921-401-00
921-401-00
921-401-00
921-401-00
921-401-00
37
37
37
37
37
Wiring Diagram
Page
PDH07
PDH07K2SE-A
PDH07K3SE-A
PDH07R2SE-A
PDH07R3SE-A
921-402-00
921-402-00
921-402-00
921-402-00
38
38
38
38
PDH09
PDH09K2SE-A
PDH09K3SE-A
PDH09R2SE-A
PDH09R3SE-A
921-402-00
921-402-00
921-402-00
921-402-00
38
38
38
38
PDH12
PDH12K2SE-A
PDH12K3SE-A
PDH12K5SE-A
PDH12R2SE-A
PDH12R3SE-A
PDH12R5SE-A
921-402-00
921-402-00
921-402-00
921-402-00
921-402-00
921-402-00
38
38
38
38
38
38
PDH15
PDH15K3SE-A
PDH15K5SE-A
PDH15R3SE-A
PDH15R5SE-A
921-402-00
921-402-00
921-402-00
921-402-00
38
38
38
38
Model
WIRING DIAGRAM
COOL WITH ELECTRIC HEAT
33
WIRING DIAGRAM
HEAT PUMP WITH ELECTRIC HEAT
34
REMOTE THERMOSTAT WIRING DIAGRAM
35
TECHNICAL SERVICE DATA
SERVICE DATA
Cooling¹
PDE07K*SE
PDE09K*SE
PDE12K*SE
PDE15K*SE
PDE07R*SE
PDE09R*SE
PDE12R*SE
PDE15R*SE
PDH07K*SE
PDH09K*SE
PDH12K*SE
PDH15K*SE
PDH07R*SE
PDH09R*SE
PDH12R*SE
PDH15R*SE
ELECTRICAL
RATINGS
INDOOR COIL
TEMPERATURE
ºF
Voltage
Amps
Supply Air
230/208
230/208
230/208
230/208
265
265
265
265
230/208
230/208
230/208
230/208
265
265
265
265
3.3
3.6
5.5
7.0
2.9
3.3
4.6
6.4
3.2
3.6
5.4
6.7
2.8
3.3
5.2
6.3
53
52
53
49
53
55
52
49
55
53
53
53
55
55
53
50
Temperature
Drop
27
28
27
31
27
25
28
31
25
27
27
27
25
25
27
30
OUTDOOR COIL
TEMPERATURE
ºF
Discharge Line
Temperature
ºF
Suction Line
Temperature
ºF
120
117
123
133
115
119
126
134
117
120
125
135
118
118
129
130
173
155
163
184
150
165
167
166
165
165
177
195
168
166
170
183
72
55
60
61
65
65
55
55
71
67
65
66
65
70
67
60
Super Heat Sub-Cooling
ºF
ºF
15
15
11
11
12
14
7
13
18
18
14
17
15
14
14
10
¹Test Conditions: 80º F, Room Air Temperature with 50% Relative Humidity, and 95º F, Outdoor Air Temperature with 40% Relative Humidity
*Denotes Heater KW - Number Varies
36
24
21
18
31
23
27
22
26
19
25
22
35
22
20
25
30
OPERATING
PRESSURES
Refrigerant
Charge
Suction Discharge
R-410A - Oz.
144
142
144
133
158
138
140
132
151
140
140
136
155
145
145
140
400
420
439
489
390
410
440
470
404
420
460
510
400
420
470
515
42.0
36.0
33.0
48.0
35.0
35.0
36.0
42.0
37.0
35.0
42.0
39.0
38.0
33.0
40.0
42.0
TECHNICAL SUPPORT
CONTACT INFORMATION
FRIEDRICH AIR CONDITIONING CO.
Post Office Box 1540 · San Antonio, Texas 78295-1540
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212
(210) 357-4400 · 1-800-541-6645 · FAX (210) 357-4490
www.friedrich.com
Printed in the U.S.A.
Printed in the U.S.A.
PD-ServMan-E (1-10)
FRIEDRICH AIR CONDITIONING CO.
Post Office Box 1540 · San Antonio, Texas 78295-1540
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212
(210) 357-4400 · FAX (210) 357-4490
www.friedrich.com
Printed in the U.S.A.
PD-ServMan-E (1-10)