SAMSUNG KFH28PV20K_KLM.GR017.1.16 Service Manual

PACKAGED AIR CONDITIONER

INDOOR UNIT	OUTDOOR UNIT
KFH28PV2	KRH28PV2

SERVICE Manual

AIR CONDITIONER		CONTENTS
1.		Precautions
2.		Product Specifications
3.		Operating Instructions and
		Installation
4.		Disassembly and Reassembly
5.		Troubleshooting
6.		Exploded Views and Parts List
7.		Block Diagrams
8.		PCB Diagrams
9.		Wiring Diagrams
10.		Schematic Diagrams

©Samsung Electronics Co., Ltd. MAR. 1999. Printed in Korea.

Code No. DB81-00071A(1)

1. Precautions

1)Turn off the the power.

Be sure to turn off the power before attempting to repair the unit such as the disassembly of the unit.

2)Be careful of electric shock

When checking the circuit with the power connected in unavoidable circumstances, take special care not to touch the live parts. There is a danger of electric shock.

3)Use of appropriate parts

Be sure to use the genuine parts of the relevant model when it is necessary to replace parts. (Replace parts instead of repairing with regard to the malfunctioning of electric contact areas. Never attempt to modify the unit. It is extremely dangerous for the consumer to attempt to repair the unit on his(her) own.)

4)Use of proper tools

Use appropriate tools for repair, and use measuring equipment after accurate calibration. Using worn tools may result in problems, including poor contact and poor connection.

5)Avoid damage to electric wire or electric cord.

Check the electric cord or electric wire for any damage during repair.

Be sure to replace it if damaged.

6)Avoid intermediate connection of the electric cord.

Never attempt to make an intermediate connection by cutting the middle area of the electric cord or make a connection to the power receptacle as it is very dangerous, causing problems or fire.

7)Checking of insulation

Be sure to check the insulation resistance after completion of the assembly work.

(Check whether the insulation resistance of the electric wire and grounding terminal is over 30MΩ by using the insulation resistance tester, and then connect the power source.)

8)Checking of grounding

Check the grounding condition, and perform repair if poorly grounded.

9)Checking of installation condition

Check the installation condition of the unit, and perform repair if there is any defective area.

If the unit remains in an unstable installing condition, install it at a new site.

10)Be careful of children

As the repair of the unit involves a lot of dangerous elements, do not allow children to approach nearby during repair work.

Cleaning

Turn off the sub power switch separately installed.

No connection with the power receptacle

Upon completion of the repair, clean the air conditioner and surrounding area, and

inform the customer of completion of the repair.

1-1

M E M O

1-2

2. Product Specifications

2-1 Table

							Model		KFH28PV2
Item
Size	Indoor unit				Unit		Width x Height x Depth	mm	500 x 1835 x 330
					Packed		Width x Height x Depth	mm	574 x 1945 x 409
	Outdoor unit				Unit		Width x Height x Depth	mm	880 x 790 x 310
					Packed		Width x Height x Depth	mm	1023 x 851 x 413
	Piping				Packed		Width x Height x Depth	mm	640 x 130 x 640
Weight	Indoor unit				Unit			kg	42
					Packed			kg	49
	Outdoor unit				Unit			kg	67
					Packed			kg	75
	Piping				Packed			kg	12
Electric	1. Cooling capacity/Heating Capacity							BTU/h	25,800 / 29,800
characteristics	2. Power consumption(Cooling/Heating)							W	2,700 / 2.900
	3. Current consuption(Cooling/Heating)							A	12.5 / 13.5
	5. Noise				Indoor unit		Turbo	dB	50 / 48
	(Cooling/						High	dB	48
	Heating)						Medium	dB	45
							Low	dB	43
					Outdoor unit			dB	59
Indoor unit	1. Evaporator						Construction	Row x Step	3 x 26
							Fin		WAVE 1.4
							Capillary tube		ø1.3 x L x 4
	2. Blower motor						No. of polarities		6P
							Capacitor		450VAC 4.5µF
							RPM	Turbo	750
								High	650
								Medium	600
								Low	550
	3. Blower						Type		SIROCCO
	4. Motor swing								220V/3W
	5. Fuse							V/A	250V 3.15A
Outdoor unit	1. Condenser						Construction	Row x Step	2 x 30
							Fin		WAVE 1.7
	2. Refrigerant volume						R-22	g	2,500
	3. Compressor						Maker		COPELAND
							Model		ZR34K3-PFJ
							Type		SCROLL
							Capacitor		450VAC 50µF
							OLP		-
	4. Fan motor						No. of polarities		6P
							Capacitor		450VAC 4.0µF
							RPM		840
	5. Fan						Type		PROPELLER
	6. Service v/v						High pressure side		3/8 inch
							Low pressure side		5/8 inch

2-1

2-2 Dimensions

unit : mm

Indoor Unit

Outdoor Unit

330

2-2

3. Operating Instructions and Installation

3-1 Operating Instructions

3-1-1 Control System Chart

Operation			Main switch operation		Auto, Cool, Dry, Fan, Heat operation
			Remote control operation		Turbo, Mild, Auto, Cool, Dry, Fan, Heat, Timer operation

Operation selector mode		Auto mode

Cool mode

Dry mode

Fan mode

Heat mode

In this mode, operation mode(COOL, HEAT) is selected automatically by room temperature of initial operation

Chaos output step fan motor control (Cooling:NATURAL, Heating:AUTO)

Indoor temperature control according to the set temperature.

Decide the dry cycle by the difference in room temperature and set temperature.

Operation of the indoor fan motor only.

Indoor temperature control according to the set temperature

Fan speed selector mode			Manual 3-step		High, Medium, Low
			Natural		Automatic decision of High, Medium, and Low step by chaos operation.
			Auto		Automatic decision of High, Medium, and Low step by chaos operation.

Airflow selector mode			Right and left turn
			UP and Down Turn
Timer operation mode			ON time
			OFF time
Convenience function			Turbo opertion
			Mild operation
			Q.timer
Self-diagnosis function			“E1”
			“E2”
			“E5”
			“E6”

Only use by remote control.

Continuously operating compressor & powerful operating fan motor(30 minutes). In case of heating operation, prevention against cold wind function is given priority before turbo operation. (Cooling:TURBO, Heating:HIGH)

Set off after opertion for one hour in medium mode, and two hours in low mode.

Reserve function which is off after on time of 30 minutes, 1,2,3, and 5 hours.

Displayed at the time of indoor temperature sensor open or short.

Displayed when the panel shutter opening/closing is not sensed.

Displayed at the time of EVAP. Sensor open or short. (Heating mode)

Displayed at the time of COND. Sensor open or short. (Heating mode)

3-1

Operating Instructions and Installation

	VFD display function			Selection of operation mode		Auto, Cool, Dry, Fan Heat Display
				Selection of fan speed		Auto, natural, high, medium, and low fan speed Display
				Current temperature		Temperature display
				Fan speed diagram		Turbo, high, medium, and low airflow Display
				Timer function		Timer Display
				Convenience function		Timer, turbo lamp, mild Dispaly
				Airflow function		Up/Down, Left/Right Display
				Others		CHECK Display, Operation Display, Defrost Display

3-2

Operating Instructions and Installation

3-1-2 Main Controller Function

3-1-2(a) Auto Operation

1. In this mode, operation mode(COOL, HEAT) is selected automatically by the room temperature of initial operation.

Room Temp.	Operation Type
Tr ³ 21˚C + DT	Cool operation (Set Temp.:24˚C + DT)
Tr < 21˚C + DT	Heat operation (Set Temp.:22˚C + DT)

DT=-1˚C, -2˚C, 0˚C, +1˚C, +2˚C

DT is controlled by setting temperature TEMP. SET Key of remote controller.

2. In Auto mode, the optimum fan speed is selected automatically and cannot be changed. · Set the "Auto" for heating.

· Set the "NATURAL" for cooling.

3-1-2(b) Cool Operation

1.The compressor is automatically turned on/off by the difference between the current temperature and desired temperature.

2.By selecting the fan speed , the operation of "low", "medium", "high", "natural", "auto" mode is selected.

3.The compressor is turned on/off by the change of the current temperature.

•The compressor is turned off when the current temperature is equal to the desired temperature.

•The compressor is turned on when the current temperature is +1˚C of the desired temperature.

4.Desired temperature setting range : 18˚C ~ 30˚C it can be changed by the unit of 1˚C.

5.Three minutes delay operation of the compressor.

ON						• Three minutes delay setting condition
OFF				1			After power reset
							On again after compressor off
	2

Three minutes delay

3-1-2(c) Heat Operation

1.The compressor is automatically turned on/off by the difference between the current temperature and desired temperature.

2.By selecting the fan speed , the operation of "low", "medium", "high", "auto" mode is selected.

3.The compressor is turned on/off by the change of the current temperature.

•The compressor is turned off when the current temperature is +1˚C of the desired temperature.

•The compressor is turned on when the current temperature is -1˚C of the desired temperature.

4.Desired temperature setting range : 16˚C ~ 30˚C it can be changed by the unit of 1˚C.

5.Delay operation of the compressor.

•Delay setting condition

ON							1		After power reset or shut down
OFF									compressor by control the desired
									temperature:3minutes.
									After deice:40sec.
			40sec-3minutes.			2
						3			After shut down compressor or 4-way
									valve:1/2minutes

3-3

Operating Instructions and Installation

3-1-2(d) Turbo Operation

Indoor fan speed

Compressor control

set fan speed	turbo fan speed(high speed)
	set fan speed
(note)	opertion mode of (note)area
	Time,(t)

start of turbo	end of turbo
operation	operation

Operating condition

1.The turbo operation is available only in auto, cool, mild and heat mode.

2.The turbo operation is performed for 30 minutes when the turbo button is pressed. (including three minutes delay time)

3.Control of the indoor fan motor and compressor during turbo operation •Indoor fan motor = Heating High

Cooling Turbo(fan speed one step higher than “high”) •Compressor : continued on regardless of room temperature.

4.After an elapse of 30 minutes from the start of turbo operaiton, the turbo operation is ended, and the unit returns to the previous mode.

5.When you press the turbo key again during the turbo operation, the turbo operation mode is canceled, and the unit returns to the previous mode.

3-1-2(e) Fan Speed Auto

1. Cooling operation

	Desired temperature +5
	Desired temperature +4	Desired temperature +4˚C
	High speed area
	Desired temperature +3
	Medium speed area
	Desired temperature +2	Desired temperature +2˚C
	Medium speed area
	Desired temperature +1
	Low speed area	• The indoor fan motor speed is
	Low speed area
		automatically controlled
	Desired temperature +0
		according to the difference
		between the indoor temperature
	2. Heating operation	and the desired temperature.

Desired temperature +1˚C

Desired temperature +0˚C

Desired temperature -1˚C

Desired temperature -2˚C

Low speed area
Medium speed area	Desired temperature -1˚C
High speed area	Desired temperature -3˚C

3-4

Operating Instructions and Installation

3-1-2(f)

Dry Operation

Room temperature[˚C]

Ts+4

A - MODE

A - MODE

B - MODE

Ts+3

Ts+2

B - MODE

C - MODE

Ts+1

C - MODE

Temperature down

Temperature up

Ts=desired temperature

1. On/off time by dry operation mode

Compressor

Operating mode

A - MODE

B - MODE

C - MODE

ON time

6 min.

5 min

3 min.

OFF time

4 min

5 min.

6 min.

•The indoor fan motor operation is fixed at a Low Speed

2.The dry operation mode is determined depending upon the difference between the indoor temperature (Ta) and desired temperature (Ts).

3.The unit is operated with the compressor on, and an indoor fan motor at a Low Speed for an initial six minutes (including a three-minute delay) after setting up the dry operation mode.

3-5

Operating Instructions and Installation

3-1-3 Key Types and Functions

3-1-3(a) Panel Key Types and Functions

KEY NAME	KEY OPERATING FUNCTION	KEY TYPE
	Start and end of operation	TACT
ON/OFF	- ON one time = operation start, ON again = operation end
	- No continued operation
	Change of the operation mode	TACT
Mode selection	-Each time the button is pressed (ON), the mode is changed in the following order ;
	"COOL → DRY → FAN → HEAT → AUTO → COOL" (standard = AUTO)
	-No continued operation
	Setting of the indoor fan motor speed.	TACT
Fan speed	-Eacn time the button is pressed (ON), the mode is changed in the following order;
selection	COOL:"LOW → MEDIUM → HIGH → NATURAL → AUTO → LOW" (standard = AUTO)
	HEAT:"LOW → MEDIUM → HIGH → AUTO → LOW" (standard = AUTO)
	Increase the desired temperature display.	JOG SHUTTLE
Temperature	-When turning the jog dial clock-wise, it displays the desired temperature and	DIAL
	holding the jog dial continuously, the desired temperature is increased by the unit of 1˚C
setting (up)
	(COOL:18˚C → 30˚C, HEAT:16˚C → 30˚C)
	-One short, and continued operation.
	Decrease the desired temperature display.	JOG SHUTTLE
Temperature	-When turning the jog dial counter clock-wise, it displays the desired temperature and	DIAL
setting	holding the jog dial continuously, the desired temperature is decreased by the unit of 1˚C
(down)	(COOL:30°C → 18°C, HEAT:30°C → 16°C)
	-One short, and continued operation.

3-6

Operating Instructions and Installation

3-1-3(b) V.F. Display Operating Spec

DISPLAY

OPERATING SPEC

• When the compressor is activated (outdoor power relay on) : ON

• When the compressor is stopped (outdoor power relay off) :OFF

OPERATING

• During the defrost operation : ON

DEFROST

• The defrost operation ended : OFF

HEAT

COOL

•

Display the selected "operation selection mode"

AUTO, COOL, DRY, FAN, HEAT

DRY

AUTO

FAN

TEMP.

˚C

•

When the ON/OFF is ON, the indoor temperature is displayed.

SET TEMP.

•

When changing the desired temperature, the indoor room temperature is displayed

after displaying the desired for 5 senconds

CHECK

• The trouble is occured by self - diagnosis funtion :ON

• The troubleshooting is completed : OFF

TIMER

• During reservation : ON

• Reservation ended or canceled : OFF

• Display the selected "fan speed selection mode"

LOW, MEDIUM, HIGH, NATURAL, AUTO

AUTO

NATURAL

•

Display operation of the indoor fan motor

LOW, MEDIUM, HIGH, TURBO

• During turbo operation : ON

TURBO

• Turbo operation ended or canceled : OFF

• During mild operation : ON

MILD

• Mild operation ended or canceled : OFF

AIR

• When [the right and left turn] is on by the remote control, it displays

SWING

AIR

•

When [the up and down turn] is on by the remote control, it displays

SWING

3-7

3-2 Installationn

3-2-1 Selection of Installation Place

3-2-1(a) Indoor Unit

•Install the unit at a place close to the wall facing the outside as it is necessary to perform piping connection with the outdoor unit.

-It is effective to install the unit at a window side to ensure uniform distribution of indoor temperature.

•Install the unit at a place where there is no obstacle against the wind around the air inlet and air outlet.

•Install the unit horizontally at a stable, rigid place.

(When installing the unit at a place subjected to vibration, noise may occur.)

•Avoid a place near the door which is frequented by people.

•Avoid a place subject to direct sunlight.

3-2-1(b) Outdoor Unit

•place free from the risk of combustible gas leakage.

•place which can bear the weight of the unit.

•place which can bear the fixing strength of the outdoor unit.

•Avoid a place subject to oil(including machine oil).

•Avoid a saline place

•Avoid a place subject to sulfide gas(hot spring zone).

(When installing the unit at such special environmental conditions, it may cause machine trouble. When it is unavoidable to use such places. It requires special maintenance.)

•A place where the discharge air and noise of the outdoor unit do not disturb the neighborhood.

(Take special care not to cause any inconvenience to your neighbors when installing the unit on the borderline with your neighborhood.)

•A place where strong wind does not head against the air outlet of the outdoor unit.

(If a strong wind heads directly against the air outlet at the time of cool operation, a safety device can be operated.)

•Do not install the outdoor unit at an unstable place such as outer wall of an apartment or building.

The outdoor unit may fall down, causing severe personal or property damage or loss.

•If there is any unavoidable reason to install the unit at such a place, take the following measures against the wind;

1.When installing the unit at a roadside concentrated with buildings, install it parallel with the road.

2.Install the unit so that the air outlet faces toward the wall at a place such as rooftop, which may be subjected to strong wind.

Top view

•Good method for using space more efficiency.

Side view

Above 50cm

Above 100cm

Wall	Strong wind
	Roof top

* Be sure to install the outdoor unit with consideration of service space.

	Above 10cm		Above 50cm
	Above 50cm		Space for pip-
			ing and wiring
	Space for piping
		Above 10cm	Above 30cm
	and wiring
	Above 10cm
	The air inlet faces toward the wall.	The air outlet faces toward the wall.

3-8

Operating Instructions and Installation

3-2-2 Electrical Work

The electrical work should be performed by a specialist qualified for the work.

•Use the single phase power supply, and be sure to install the sub power distributing board for exclusive use with the unit(separately purchased by the user).

•Avoid octopus-type wiring as it can cause a drop in voltage, thus resulting in poor performance of the automatic control circuit.

•Be sure to install the earth leakage circuit breaker (separately purchased by the user).

•Be sure to connect the grounding wire.

Electric power spec					Connecting wire & PCB fuse spec
		SPEC					TYPE	SPEC
	Power	Single phase 220V-240V~, 50Hz				Power cable	H07RN-F	3G 2.5mm2	450-750V~
	Sub switch	30 A				Connecting wire	H07RN-F	5G 1.0mm2	450-750V~
	Fuse	30 A					H05RN-F	2G 0.75mm2	300-500V~
	Electric wire Below 20m	3.5 mm2				Sensor cable	H05RN-F	2G 0.75mm2	300-500V~
	Allowable voltage	198V ~ 264V				PCB fuse	50T	250V~, 3.5A
							F2L	250V~, 2A
Indoor and Outdoor Connection Wiring

•When connecting the connecting wire between the indoor and outdoor unit, be sure to align the terminal block number with the connecting wire number.

•When the connecting wire is not properly connected, it may cause trouble.

Be careful not to allow connecting wires and power lines to get in contact with service valve or the pipe without an insulator.

Color of connecting wire	Model name	No.	1	2	3	4	5
	KRH28PV2		BRN	SKY	Thin BRN	BLK	Thin SKY

Outdoor side

Terminal plate

Cable clamp

Cover control

Electric

panel board

Cable cover

Holder cable

Base control

Terminal block

Earth

1.Connect the connecting wire to the terminal block and connect the earth wire to the bracket earth.

2.Close the cover control.

3.As following the figure, firmly fix connecting wire with the holder cable.

A	Wire of sensor
B	Earth
C	Power cable

Electrical Wiring

1.Connect it to the terminal board N and L for power supply to the outdoor unit.

In so doing, peel off the end of the power cord by about 5mm, and press the cord to the ring terminal for hooking.

2.Perform the power grounding using the screw for exclusive use with the outdoor unit.

3-9

Operating Instructions and Installation

3-2-3 Installation Method

3-2-3(a) Indoor Unit

This unit is greater in height compared to its width, and thus it may fall down.

Therefore, be sure to fix the unit to the wall and floor surfaces securely to prevent the unit from falling down.

Fixing to the wall

•Fix the unit using the fixing holders separately supplied.

•Select a direction (right or left) according to a place of being installed.

•The fixing holder “B” was decided on a direction (front or rear) according to a condition of being installed.

1.Fix the fixing holder “B” using the screw at a rear side groove.

2.Put the fixing holder “A” on the fixing holder “B”, then fix holders using the nut, washer and bolt to direction you want.

3.Fix the fixing holder “A” to the wall.

3-2-3(b) Outdoor Unit

When using the anchor bolt

1.Fix the unit on a flat, rigid floor using the anchor bolt.

(Anchor bolt : M10 x 4 points - separately purchased)

When using the leg holder of the outdoor unit

1.Insert the foot holder (4EA, optional).

2.Remove the nut fastened to the leg holder, and then insert the leg holder into the hole of the outdoor unit leg.

3.Fix the unit securely with the nut.

Anchor bolt fixing dimensions

Unit:mm

A

B

660 335

Nut

Outdoor unit leg

Leg holder

Foot holder

3-10

Operating Instructions and Installation

3-2-3(c) Installation Procedures

1 Open the inlet grille, and remove the flare nut.

2.Bend the connection pipe to an appropriate length using the spring bender depending upon the installation place.

-Allowable pipe length : Maximum 25m

-Allowable pipe drop distance : Maximum 15m

-Make no more than ten bending points on the pipe

•When the pipe length is in excess of the standard pipe length of 5m, add the refrigerant

(R-22) of 50g for each additional 1m.

Caution

•If the pipe is lengthened, the performance of the unit is degraded, and the service life is shortened. Therefore, the pipe length should be as short as possible (less then 15m).

3.Install the high pressure pipe to the heat exchanger liquid pipe, and the low pressure pipe to the heat exchanger gas pipe respectively using the flare nut, taking care not to cause any leakage of refrigerant.

4.Be sure to insulate the pipe with appropriate insulation material.

5.Insert the drain hose into the drain pipe, and connect them by tying them to the cable tie to prevent any water leakage.

6.After completion of the installation, check the connecting area for any gas leakage.

7.Wind a finish tape when the wiring of the refrigerant pipe, the unit, and the drain piping are completed.

	Outdoor unit
Indoor unit	checking area
checking area

3-11

Operating Instructions and Installation

3-2-3(d) Connection of refrigerant pipe

Flare Processing

1. Cut the pipe using the pipe cutter.

Oblique

Roughness

Burr

2. Insert the flare nut into the pipe, and then perform the flare processing.

Outer Diameter	A
ø 6.35 mm	1.3
ø 9.52 mm	1.8
ø 15.8 mm	2.0

Pipe Bending

		1.	Perform bending of the pipe using the bender which has
	Spring
			a specified bending radius.
		2.	Be sure to take full care to perform bending of the pipe
			successfully at one time. Bending and unbending the pipe
			more than twice makes the bending work increasingly
			difficult.
	3.		You may use the spring inserted into the gas pipe instead
			of the bender to bend the pipe.
	4.		When you bend the pipe using the spring, hold the pipe
			with both hands to prevent any distortion, and secure a
			minimum bending radius of more than 100mm.

Tightening of Connection Parts

•Align the center of the connection piping, and tighten the flare nut by turning it with hand. Then tighten it again using the spanner in the direction as shown in the figure.

Outer Diameter	Tightening Torque	Final Torque	Remarks
ø 6.35mm	160 kg • cm	200kg • cm
ø 9.52mm	400 kg • cm	450 kg • cm
ø 15.8mm	700 kg • cm	750 kg • cm

3-12