Daikin GYEQ20AN User manual

Heat Recovery R-410A 50 Hz
GYEQ20/30AN
SiAUY361411EA
Service
Manual
Gas Heat Pump
Air Conditioner

SiAUY361411EA
iTable of Contents
Gas Heat Pump
Air Conditioner
Heat Recovery
R-410A 50 Hz
ED Reference
For items below, please refer to Engineering Data.
1. Introduction ............................................................................................ iv
1.1 Safety Precautions ...................................................................................v
Part 1 General Information ........................................................... 1
1. Model Names ..........................................................................................2
1.1 Indoor Units ..............................................................................................2
1.2 Outdoor Units ...........................................................................................3
1.3 BS Units ...................................................................................................3
1.4 Air Treatment Equipment .........................................................................3
2. External Appearance...............................................................................4
2.1 Indoor Units ..............................................................................................4
2.2 Outdoor Units ...........................................................................................5
2.3 BS Units ...................................................................................................5
2.4 Air Treatment Equipment .........................................................................5
3. Capacity Range.......................................................................................6
3.1 Combination Ratio....................................................................................6
3.2 Indoor Unit Connection Capacity..............................................................6
3.3 Heat Recovery Operation.........................................................................6
Part 2 Device Overview ................................................................ 7
1. Model Naming .........................................................................................8
2. Unit Specifications...................................................................................9
3. External Diagrams.................................................................................10
4. Structural Diagrams ..............................................................................12
5. System Diagrams..................................................................................14
5.1 Refrigerant System Diagrams ................................................................14
5.2 Cooling Water, Intake Air, Fuel and Engine Oil System Diagram ..........23
No. Item ED No. Page
1 Specification – Indoor Unit EDAU361403 16-17, 32-33, 48-49, 76-77, 94, 108-109, 126-128,
146-147, 166-168, 194, 206, 220-221, 234-237,
256
2 Specification – Outdoor Unit EDAU361402 40
3 Piping Diagram EDAU361402 44
4 Accessories EDAU361402 56

SiAUY361411EA
Table of Contents ii
6. Sensor Mounting Positions ...................................................................25
6.1 Sensors Installed on the Engine.............................................................25
6.2 Sensors Installed in the System .............................................................26
7. Electrical Wiring Diagrams ....................................................................27
8. Installation Work Manual.......................................................................28
9. Wiring Manual .......................................................................................57
10.Test Run Manual...................................................................................67
Part 3 Control and Functionality ................................................ 89
1. Control Overview...................................................................................90
1.1 System Control Overview.......................................................................90
1.2 Startup Sequences.................................................................................93
1.3 Actuators ................................................................................................95
1.4 Setting Up and Rewiring the Outdoor Unit .............................................96
2. Outdoor Unit Control .............................................................................98
3. Actuator Control ..................................................................................103
3.1 Electric Motor Operated Valve Control.................................................103
3.2 Pump Control .......................................................................................107
3.3 Fan Control...........................................................................................107
3.4 Heater Control ......................................................................................107
3.5 Starter Control ......................................................................................107
3.6 Compressor Clutch Control ..................................................................107
3.7 Ignition Timing Control .........................................................................108
Part 4 Troubleshooting ............................................................. 109
1. Troubleshooting the Outdoor Unit .......................................................110
1.1 Error Codes ..........................................................................................110
1.2 How to Use the Checker on PCB .........................................................113
1.3 RUN Mode............................................................................................115
1.4 STOP Mode..........................................................................................121
1.5 Main Operations in Servicing ...............................................................125
2. Flow Charts for Troubleshooting .........................................................128
2.1 Problems without Error Codes .............................................................128
2.2 Problems with Error Codes ..................................................................131
Part 5 Parts Inspection ............................................................. 169
1. Inspecting the Outdoor Unit ................................................................170
1.1 Safety Precautions for Inspecting or Servicing the Outdoor Unit .........170
1.2 Inspecting the Starter System ..............................................................171
1.3 Inspecting the Fuel Control System .....................................................173
1.4 Inspecting the Mixer System ................................................................174
1.5 Inspecting the Ignition System .............................................................176
1.6 Inspecting the Regulator ......................................................................179
1.7 Inspecting the Valve Clearance............................................................179
1.8 Inspecting the Compression Pressure .................................................180
1.9 Inspecting the Belt................................................................................180
1.10 Inspecting the Air Cleaner ....................................................................181
1.11 Inspecting the Breather Hose...............................................................181
1.12 Inspecting the Engine Oil Level............................................................182

SiAUY361411EA
iii Table of Contents
1.13 Inspecting Refrigerating Machine Oil and Refrigerant..........................183
1.14 Inspecting the Cooling Water Filter ......................................................184
1.15 Checking the Cooling Water System for Water Leaks .........................184
1.16 Inspecting the Cooling Water Level......................................................185
1.17 Inspecting the Water Motor-operated Valve.........................................185
1.18 Inspecting the Thermostat....................................................................186
1.19 Inspecting the Cooling Water Concentration........................................187
1.20 Inspecting the Oil Pressure Switch.......................................................187
1.21 Inspecting the Cooling Water Temperature Sensor .............................187
1.22 Inspecting the Exhaust Temperature Sensor .......................................188
1.23 Inspecting the Compressor ..................................................................189
1.24 Inspecting the Compressor Clutch .......................................................190
1.25 Inspecting the Solenoid Valves ............................................................191
1.26 Inspecting the Outdoor Fan Motor........................................................192
1.27 Inspecting the Refrigerant Amount.......................................................193
1.28 Inspecting the Check Valve..................................................................194
1.29 Inspecting the Electronic Expansion Valve ..........................................195
1.30 Checking Stop Valve Operation ...........................................................196
1.31 Inspecting the Four-way Valve .............................................................197
1.32 Inspecting the SC Coil..........................................................................197
1.33 Inspecting the Refrigerant System Sensors .........................................198
1.34 Inspecting the Outdoor Unit's Circuit Boards and
Power Supply System ..........................................................................200
1.35 Inspecting the Communication Cables.................................................200
1.36 Inspecting the Heaters .........................................................................201
Part 6 Replacement of Parts .................................................... 202
1. Precautions to Take before Replacement...........................................203
1.1 Safety Precautions ...............................................................................203
1.2 Safety Precautions for Replacement....................................................203
2. Replacement of Primary Parts ............................................................204
2.1 Replacing the Engine ...........................................................................204
2.2 Replacing the Compressor...................................................................206
2.3 Replacing the Compressor Heater .......................................................209
2.4 Charging the Refrigerating Machine Oil ...............................................209
2.5 Charging the Refrigerant ......................................................................210
2.6 Removing the Control Box ...................................................................210
Part 7 Maintenance / Service Data ........................................... 211
1. Maintenance........................................................................................212
1.1 Periodic Inspection Items, Quantities,
and Standard Values for the Outdoor Unit ...........................................212
1.2 Periodic Inspection Procedure for the Outdoor Unit.............................213
2. Servicing Data.....................................................................................225
2.1 Resistance/Temperature Characteristics of Various Sensors..............225
2.2 Pressure/Voltage Characteristics of Pressure Sensors .......................226
2.3 Pressure/Saturation Temperature Conversion Chart for
Outdoor Unit Pressure Sensors ...........................................................227
2.4 Tightening Torque Table ......................................................................228
2.5 Standard Operation Data (Reference Values) .....................................230

SiAUY361411EA Introduction
iv
1. Introduction
This service manual covers the GYEQ20AN and GYEQ30AN outdoor unit models of the
Yanmar Gas Heat Pump system, and the indoor units that can be connected to these models.
The following safety alert symbols are used throughout this service manual to highlight safety
precautions so that you can safely perform maintenance and servicing tasks in accordance with
the instructions contained in the manual:
: This safety alert symbol appears with particularly important instructions. Make sure
you follow the instructions.
This manual uses the following icons to highlight safety precautions you must follow to prevent
accidents that may occur while inspecting or repairing the unit as well as to ensure safety after
you have completed the tasks:
Warning Indicates that there is a possibility that a fatal accident or serious injury
may result from failure to take sufficient safety precautions.
Caution Provides instructions for safe handling or indicates that there is a
possibility that an injury or a serious breakage of the product may
result from failure to take sufficient safety precautions.
Icon Title Description
Prohibited Indicates a prohibited action.
Mandatory Indicates a mandatory action.
Connect to
ground Instructs you to make a ground connection without fail.
Caution:
Electric shock!
Indicates that you may possibly get an electric shock under certain
situations.
Caution:
High temperature!
Indicates that you may possibly get burned or otherwise injured
due to high temperatures under certain situations.
Caution:
Rotating parts!
Indicates that removing a guard or protector for a rotating part
(such as a motor or a fan) could possibly result in an injury.

Introduction SiAUY361411EA
v
1.1 Safety Precautions
Safety precautions
Safety precautions to take before and during inspection or repair
Warning Before you perform disassembly and assembly, be sure to turn OFF the main power switch.
Take extreme care not to touch the charging unit during work;
otherwise you may get an electric shock, possibly resulting in a
fatal accident or serious injury.
While the power is being supplied, some electrical parts are
charged with high voltages from 200 V to 300 V. Inadvertently
touching such high-voltage parts could result in a possibly fatal
electric shock.
When accessing the electrical system (for example, to locate
faulty parts), take sufficient care not to inadvertently touch the
charging unit. Also, be sure to disconnect the main power
connector from the outlet before replacing parts.
If refrigerant gas is leaking, pinpoint and permanently fix the
leaking spot, rather than merely charging the refrigerant.
After fixing the leaks, charge the refrigerant and then recheck for
any leaks.
If you cannot pinpoint the leaking spot and thus cannot continue
the repair work, recover the refrigerant and then close the
servicing valve.
Failure to recover the refrigerant could cause the refrigerant gas
to leak into the air-conditioned room.
The refrigerant itself is harmless but can cause the generation of
toxic gas when it is exposed to high temperatures associated with
a fan, heater, stove, burner, or the like.
When working in high places, be sure to use a helmet and/or
lifeline in case you topple or fall; otherwise, you could face a
greater risk of a fatal accident or serious injury.
When you repair parts contained in a compartment (particularly
the engine room) inside a unit such as an outdoor unit with the
unit's panels removed, be sure to wear protective gloves and
other clothing to prevent injuries that may occur as the result of
inadvertently touching protrusions or edges inside the unit and
follow the specified procedure.
Caution If you have to repair parts with the power ON, be sure to attach a
protective cover before turning ON the power.
Working without a protective cover attached could possibly result
in an electric shock or injury.
When accessing a compressor to check for or repair faulty parts,
never touch the compressor with bare hands while it is operating
or when it has just stopped; otherwise, you could get burned.
When installing a fan, properly tighten the fan screw.
If poorly tightened, the fan may come off while operating, possibly
resulting in an injury.
Do not work in an improper position when you carry or move a
heavy object.
Working in an improper position could result in an acute low back
pain or an injury due to dropping of a heavy object.
When repairing parts, use tools that suit your purpose.
Using inappropriate tools could result in an injury.
During repair work, take sufficient care to keep away people other
than service engineers, because unexpected dangers may be
present.

SiAUY361411EA Introduction
vi
Safety precautions to take after inspection or repair
Warning Upon completion of repair work, check the insulation with a mega ohmmeter (insulation resistance tester) to make sure that the
insulation resistance is 2 MΩor higher. If the insulation resistance
is lower than 2 MΩ, an electric shock or fire may possibly result;
therefore, inspect electrical parts, lead wires, and other related
parts and replace any faulty parts.
During repair work, check lead wires, connector terminals, power
cords, main power connector, and other related parts for
contamination or deterioration.
Replace any flawed or deteriorated parts, which may possibly
cause an electric shock or fire.
When any lead wire is found disconnected, reconnect the lead
wire properly, for example, by using a nylon connector or by
twisting and then soldering the conductors.
Poor connections may possibly result in an electric shock or
injury.
Check the main power connector for accumulated dust and
shakiness, and plug it in properly. Using the main power
connector with dust accumulated on it or without plugging it in
properly could result in an electric shock or fire.
The product must be securely installed on a solid surface that can
fully bear the product's weight and vibration during operation.
Never install the product (indoor or outdoor unit) either on a
surface that cannot bear the product's weight and vibration during
operation or in an unstable way; otherwise, the product may fall,
possibly resulting in a fatal accident or serious injury.
Never modify the product in any way.
Modifying the product could result in an electric shock,
overheating, or fire.
When relocating the unit, securely install it on a surface that can
bear its weight.
Never install the unit either on a surface that cannot bear the
product's weight and vibration during operation or in an unstable
way; otherwise, the unit may fall, possibly resulting in an injury.
Use specified cables for wiring between outdoor and indoor units.
The cables should be perfectly connected to the appropriate
connectors and fastened tightly so that the terminal connectors
will not be exposed to external forces via the cables.
Using cables without properly connecting and fastening them
could result in overheating or fire.
The cables between outdoor and indoor units must be organized
so that the terminal covers will not rise. The terminal covers must
be properly attached.
Using the cables without properly attaching the covers could
result in an electric shock, overheating, or fire at the terminal
connections.
The power cord must not be modified and must be replaced if
broken. Also, the power cord must not be combined with an
extension cord or share the same outlet as other electrical
appliances via a power strip or the like because doing so could
result in an electric shock or fire. The power cord must not be
loaded with something heavy, heated, or pulled because doing so
could result in breakage.
If refrigerant gas is leaking, pinpoint and permanently fix the
leaking spot, rather than merely charging the refrigerant. After
fixing the leaks, charge the refrigerant and then recheck for any
leaks. If you cannot pinpoint the leaking spot and thus cannot
continue the repair work, perform pump down operation and then
close the servicing valve. Failure to recover the refrigerant could
cause the refrigerant gas to leak into the air-conditioned room.
The refrigerant itself is harmless but can cause the generation of
toxic gas when it is exposed to high temperatures associated with
a fan, heater, stove, burner, or the like.

Introduction SiAUY361411EA
vii
Safety precautions to take after inspection or repair
Caution Any parts you use for repair must be listed on the servicing parts
table specific to the model.
Using unlisted parts could result in a recurring fault or fire.
Inspect ground connections and rework them as needed.
An improper ground connection could result in an electric shock.
Replace the installation base and mounting frames if they are
found deteriorated due to corrosion or some other reason.
Otherwise, the unit may fall, possibly resulting in an injury.
Never fill any refrigerants other than R-410A refrigerant.
This machine has been designed and manufactured as a
specialized unit for R-410A refrigerant.
If a different type of refrigerant other than R-410A refrigerant is
used, a mechanical fault, malfunction and failure may result,
which could cause a serious safety hazard.
The filled refrigerant type is described on the machine nameplate.

SiAUY361411EA Introduction
viii
List of safety warning plates/labels
■Types of warning/caution labels and plate
⑤ Warning label (High voltage)
① Warning label (High temperature)
やけどの恐れあり。高温部に触れないこと
Don’t touch the high-temperature part
ঐሞඩຨພ!ข႙ۂࡴၫؠࠍ
② Caution label (Stepping on parts)
③ Warning label (Rotating parts)
けが の 恐れあり。回転部に触れないこと
Don’t touch the rotor
ঐሞඩ།ພ!ข႙ۂᅢᎡؠ
④ Caution plate (Outdoor unit)
023331-02EN00
感電の恐れあり。高電圧部に触れないこと
Don’t touch the high-voltage part
ঐሞඩۂݢ!ข႙ۂࡴݢᅼؠၤ
けが の 恐れあり。上に乗らないこと
Danger.Don't step on.
ঐሞඩ།ພ!ᇋ኷ຢಅةྑ
（注）
保守サ−ビスなどに必要なスペース
は据付要領書を参照のこと
可燃物からの離隔距離
(cm)
ガス機器防火性能評定品
財団法人 日本ガス機器検査協会
ご 注 意
類の回収が必要です。
は室外機内部に貼付されたシールに記載され
フロン類の種類及び数量は、製品銘板あるい（3）
ています。
フロン回収・破壊法
第一種特定製品
（1）
この製品には冷媒として、ＨＦＣが使われて
フロン類をみだりに大気中に放出することは
います。
禁じられています。
（2）この製品を廃棄・整備する場合には、フロン
 1. 本体に表示してあるガス種以外の燃料ガスは使用しないでください。
 2. ガス管接続には指定の強化ガスホース（または液化石油ガス継手金具付き低圧ガス
ホース）を使用してください。
 3. 冷媒配管接続後、気密試験を行ない漏れのないことを確認してください。
 4. D種接地工事を行ってください。感電の恐れがあります。※1
 5. カバー類は絶対開けないでください。回転体に接触したり、巻き込まれる恐れがあ
り危険です。
 6. 吹出口のファンカバーを絶対に取外さないでください。ファンが露出して危険です。
 7. 排気ガスは周囲に悪影響の無い場所で大気開放してください。排水枡、溝等への排
出は中毒の恐れがあります。
 8. 排気ドレンは室内機ドレン配管と一緒にしないでください。そして大気開放された
場所に排出してください。排気ガスが室内に入り危険です。
 9. 排気ドレンは雑排水溝等の適切な排水溝まで配管して排出してください。コンクリ
ート表面を汚したり、シート防水を損傷する恐れがあります。
10. 運転中異常な振動や音があるときは、ただちに運転を停止し、自分で修理せずに、
お買い求めの販売店に連絡ください。
11. 排気出口より白い煙が出ることがありますが、これは異常ではありません。
12. 長期間ご使用にならない場合は、万一のガス漏れ防止のためガス元栓を閉じておい
てください。ただし、元電源は切らないでください。
６０以上
（前面）
（上面）
１５以上
１５以上
１以上
１以上
排気口
R410A

Introduction SiAUY361411EA
ix
Attached locations of safety warning plates/labels
026946-00X
026947-00X
∗Although the actual appearance is slightly different to the figure above, the location
of the safety labels is the same.
∗Although the actual appearance is slightly different to the figure above, the location
of the safety labels is the same.
12
3
4
12
33
4
Outside of outdoor unit
Indicated location of
the model name
the model name
Indicated location of
023332-01EN01
• GYEQ20AN
• GYEQ30AN
The model name is displayed at locations where the following label is attached:
Indicated location of the model name