Friedrich DH30 User manual

MODELS:
DH30
DH40
DH50
DeHumSrv (03/02)

CONTENTS
INTRODUCTION
PREFACE
SAFETY PRECAUTIONS ........................................................................................................... 4
FEATURES ................................................................................................................................. 4
DIMENSIONS ............................................................................................................................. 4
SPECIFICATIONS ...................................................................................................................... 5
CONTROL .................................................................................................................................. 6
HOW TO OPERATE DEHUMIDIFIER ........................................................................................ 6
HOW DOES THE DEHUMIDIFIER WORK? ............................................................................... 6
LOCATION FOR THE DEHUMIDIFIER ...................................................................................... 6
MICROSWITCH .......................................................................................................................... 7
AUTO DEFROST ........................................................................................................................ 7
HUMIDITY CONTROLLER ......................................................................................................... 7
DRIER ........................................................................................................................................ 7
CIRCUIT DIAGRAM .............................................................................. 8
DISASSEMBLY INSTRUCTIONS
MECHANICAL PARTS ............................................................................................................... 10
BUCKET AND AIR FILTER ......................................................................................................... 10
FRONT GRILLE .......................................................................................................................... 10
CABINET AND CONTROL BOX ................................................................................................. 10
CONTROL PARTS ..................................................................................................................... 11
ROTARY, SWITCH /SWITCH ASSEMBLY, ROTARY /PWB (PCB) ASSEMBLY,
DISPLAY /PWB (PCB) ASSEMBLY, MAIN ................................................................................ 11
CAPACITOR ............................................................................................................................... 11
SENSOR ASSEMBLY ................................................................................................................ 11
MICRO SWITCH ASSEMBLY ..................................................................................................... 11
POWER CORD ASSEMBLY ....................................................................................................... 11
FAN AND MOTOR ...................................................................................................................... 12
SHROUD AND BARRIER ........................................................................................................... 12
REFRIGERATING CYCLE ......................................................................................................... 13
CONDENSER, EVAPORATOR AND CAPILLARY TUBE (HEAT EXCHANGE ASSEMBLY) ..... 13
P.T.C. OR OVERLOAD PROTECTOR (O.L.P.) FOR RECIPROCATING COMPRESSOR ........ 13
ROTARY COMPRESSOR .......................................................................................................... 13
HOW TO REPLACE REFRIGERATION SYSTEM ...................................................................... 14
TROUBLESHOOTING GUIDE ............................................................. 16
EXPLODED VIEW - INTRODUCTION .................................................. 19
REPLACEMENT PARTS LIST ............................................................. 21

INTRODUCTION
This service manual was written to assist the professional service technician to quickly and accurately
diagnose and repair any malfunctions of this product. This manual, therefore, will deal with all sub-
jects in a general nature. (i.e. All text will pertain to all models).
IMPORTANT:
It will be necessary for you to accurately identify the Model you are servicing, so you can be
certain of a proper diagnosis and repair. (See Unit Identification.)
The information contained in this manual is intended for use by a qualified service technician
who is familiar with the safety procedures required to repair, and who is equipped with the proper
tools and test instruments.
Repairs made by unqualified persons can result in hazards subjecting them to the risk of injury or
electrical shock which can be serious or even fatal not only to them, but also to anyone being
served by the equipment.
If you perform service on equipment, you must assume responsibility for any bodily injury or
property damage which may result to you or others. Friedrich Air Conditioning Company will not
be responsible for any injury or property damage arising from improper service, and/or service
procedures.

PREFACE
This Service Manual provides various service information, containing the mechanical and electrical parts etc. This dehu-
midifier was manufactured and assembled under the strict quality control system. The refrigerant is charged at the factory.
Be sure to read the safety precaution prior to servicing the unit.
SAFETY PRECAUTIONS
• Disconnect the power supply before servicing or replacing any component.
• Do not cut off the grounding prong or alter the plug in any manner under any circumstances.
FEATURES
Quiet
High efficiency
Adjustable humidistat
Automatic defrost
Automatic shut-off
Bucket-full indicator light
Easy roll casters
Large capacity, removable bucket.
Washable air filter
2 fan speeds
Drain hose connection.
DIMENSIONS (in/mm)
12 5/8"(320)
S
cO
0
17 1/2" (445)
13 3/8" (340)
k,J _
r---t__.
ol

SPECIFICATIONS
-__-_ MODELS
ITEMS ___
CAPACITY (Pint/Day)
POWER SUPPLY (Phase, V, Hz)
REFRIGERANT
REFRIGERANT CHARGE, oz(g)
THERMISTOR
HUMIDITY SENSOR
P.T.C.
ASSEMBLY
PROTECTOR
AMPERE
MAXIMUM VOLTAGE
CAPACITOR
SWITCH, ROTARY
MOTOR ASSEMBLY, SINGLE
SWITCH ASSEMBLY, MICRO
IWITHOUT BUCKET
OUTSIDE
DIMENSIONS
W x H x D, n. (mm) WITH BUCKET
NET WEIGHT, Lbs (Kg)
DH3011B
30
DH4010E
4O
1{], 115V, 60Hz
R134a R22
4.76(135) 5.11 (145) 7.05(200)
OPEN : 28.4°F(-2°C +_0.5)
CLOSE : 53.6°F(12°C_+0.5)
CONTROL RANGE : 20% - 80% RH
NORMAL SETTING : 40% RH
7A
300V
• OVERLOAD PROTECTOR FOR COMPRESSOR
• INTERNAL PROTECTOR(FUSE) FOR MOTOR
251JF,270VAC
6A/125VAC, 12A/250VAC
Shaded polo motor, 65W/1A j., Thermal cutoff : 266°F/130°C
16A/125VAC, 8A/250VAC
12 5/8 x 20 7/8 x 13 3/8 (320 x 530 x 340)
12 5/8 x 20 7/8 x 17 1/2 (320 x 530 x 445)
<215) k 38(17.2) !39(17.7147 Ll
-_ NOTE : Specifications are subject to minor change without notice for further improvement.
DH5010E
50

CONTROL
O
Off Max
Auto Shut-Off
• Glows when the bucket is ready to be emptied, or when
the bucket is removed or not replaced in the proper
position.
• The Water Level Control Switch shuts the dehumidifier off
when the bucket is full, removed, or not replaced in the
proper position.
Humidity Control
When first using the dehumidifier, we recommended
that you run the unit with the humidistat control set to
MAX for the first three or four days until excess moisture
and dampness odors are gone. After that you can
select the humidistat position that will best suit local
conditions. The dehumidifier can control from 20% to
80% relative humidity. (See Figure 3.)
MAX isthe highest setting.
When excess moisture and dampness odors are gone,
adjust the control to a lower setting. Use the
dehumidifier as long as excess moisture is present.
Fan Speed
The fan control adjusts the fan speed. Set the fan
control to HIGHfor maximum moisture removal. When
the humidity has been reduced and quiet operation is
preferred, set the fan control to LOW.
HOW TO OPERATE DEHUMIDIFIER
HOW DOES THE DEHUMIDIFIER WORK?
Moist, humid air is drawn over a cold refrigerated dehumidi-
fying coil. Moisture in the air condenses on this coiland
drains into a bucket (or through the bucket into a hose and
drain).
Dry, clean air is drawn over the condenser where it is
actually heated several degrees and discharged out the
front grille into the room.
It is normal for the surrounding air to become slightly
warmer as the dehumidifier operates.
This warming effect further reduces the relative humidity of
the surrounding air.
LOCATION FOR THE DEHUMIDIFIER
Allow at least 12 inches of space on all sides of the unitfor
good air circulation.
The dehumidifier must be operated in an enclosed area to
be most effective. Close all doors, windows and other
outside openings to the room.
Place the dehumidifier in a location that does not restrict air
flow into the rear coil or out the front grille.
A dehumidifier operating in a basement will have little or no
effect in drying an adjacent enclosed storage area, such as
a closet, unless there is adequate air circulation throughout
of the area.
Ai? ut
Motor
Figure 1
Fan Condenser Evaporator
_ jJ
Air In
I "Drain
Compressor Connection
Side View
Figure 2 Air In
Air Out
J
J

MICROSWlTCH
The microswitch assembly, which is located on the barrier inside the unit, automatically turns the dehumidifier off when the
bucket is full. (NOTE: the Auto Shut-Off light will illuminate to indicate the bucket should be emptied). When the bucket is
reinstalled, the unit will resume dehumidification.
AUTO DEFROST
When frost builds up on the cooling coils, the compressor wilt cycle off until the frost melts. The fan will continues to run.
NOTE: This unit is designed to be operated at temperatures above 65°F (18°C). If the dehumidifier is operated in
low temperature conditions where the temperature and humidity of the room are low, frost can form on the evapo-
rator coil and cause the unit to short cycle.
HUMIDITY CONTROL
The humidistat automatically maintains the relative humidity
in the room.
For MORE humidification, turn the dial towards MAX.
For LESS dehumidification, turn the dial towards OFF.
When the relative humidity in the room INCREASES to the
selected level, the dehumidifier STARTS automatically.
When the relative humidity DECREASES to the selected
level, the dehumidifier wilt stop automatically.
NOTE: The relative humidity levels shown in Figure 3 are
approximate values.
42%
421/_R,H_ 40"/o
50 Yo /J35% ,0%
70%°/'--;/ I I _,' /I 2o5°/o
OffS DEA1 DIAL _'Ma/v _ x.
Figure 3
DRIER
Adryer is used to trap noncendensables in the sealed
system.
NOTE: The drier must be replaced any time a sealed
system repair is performed. The drier must be installed
at the inlet of the capillary tubes.
_ Drier
Figure 4

DISASSEMBLY INSTRUCTIONS
BUCKET AND AIR FILTER
1. Turn the Humidity Control off.
2. Disconnect the power supply.
3. Remove the bucket. (See Figure 5.)
4. Flex the filter at the lower right corner and take it
off. (See Figure 5.)
Disconnect Power Supply
Figure 5
FRONT GRILLE
1. Remove the two screws at the bottom of the front
grille.
2. While pressing in on both sides of front grille, pull
the grille out from the bottom and upward. (See
Figure 6.)
Push
Figure 6
CABINET AND CONTROL BOX
1. Remove the bucket, air filter and front grille
according to the procedure above.
2. Remove the two screws that hold Control box.
(See Figure 7.)
3. Remove the nine screws shown in Figure 7.
4. Liftthe Cabinet from the base. (See Figure 8.)
5. Remove the screw that connects the ground wire
on the inside ofcontrol box.
6Remove the screw that holds the control box, and
unhook the controlbox from the shroud. (See
Figure 8.)
%
Figure 7 Figure 8

CONTROL PARTS
ROTARY, SWITCH /SWITCH ASSEMBLY,
ROTARY /PWB (PCB) ASSEMBLY,
DISPLAY /PWB (PCB), ASSEMBLY, MAIN
1. Remove the screw in the front and upper side of the
control box and then unfold the two sides of the
control box.
2. Disconnect the housing and all the leads to the
rotary switch, switch assembly rotary and PWB
(PCB) assembly, DISPLAY from PWB (PCB)
ASSEMBLY, MAIN.
3. Remove the two screws which hold the rotary
switch.
4. Remove the nut which fastens the switch assembly,
rotary.
5. Pull the PWB (PCB) ASSEMBLY, DISPLAY out.
6. Remove the screw which fastens the PWB (PCB)
ASSEMBLY, and pull it out from the two rectangular
holes in control box.
CAPACITOR
1. Remove the screw that fastens capacitor. (See
Figure 9.)
2. Disconnect all leads from capacitor then remove
them from the control box.
Figure 9
Figure 10
SENSOR ASSEMBLY
1. Disconnect the sensor housing assembly. (See
Figure 9.)
2. Remove the screw which fastens the humidity
sensor. (See Figure 10.)
Figure 11
I
Figure 12

FAN AND MOTOR
1. Remove the fan mounting nut and remove the fan.
2. Remove the two screws (upper left and right) that fasten the condenser.
3. Carefully lift the condenser coil and rotate it about 45 degree clockwise. (See Figure 13.)
4. Remove the three screws that secure the fan motor and ground wire. (See Figure 1
5. Remove the motor.
/
!
Figure 13 Figure 14
SHROUD AND BARRIER
1. Recover the refrigerant from the system using approved EPA equipment and procedures.
2. Unbraze the discharge and suction tubes connected compressor.
3. Remove the two screws that fasten the condenser.
4. Remove the three screws that secure the shroud on the back and sides, and move the shroud upward from the barrier.
5. Remove the two screws that secure the barrier to the base pan.
6. Pull the barrier backward then remove it from the base.
Figure 15
10

REMOVING THE CONDENSER,
EVAPORATOR AND CAPILLARY TUBE
(HEAT EXCHANGE ASSEMBLY)
1. Remove the insulation on the condenser assembly.
2. Pierce the pinch-off tube to recover the refrigerant
according to EPA requirements.
3. After recovering the refrigerant completely, remove
the two screws between the shroud and condenser.
(See Figure 16.)
4. Lift and turn the condenser 45 degree clockwise.
5. Unbraze the two tubes of the evaporator and
condenser.
6. Remove the condenser from the shroud. (See Figure 17.)
7. Unbraze the capillary tube at both condenser and
evaporator. (See Figure 18.)
8. Remove the four screws between the condenser and
evaporator. (See Figure 18.)
Figure 18
P.T.C. OR OVERLOAD PROTECTOR
(O.L.P.) FOR RECIPROCATING
COMPRESSOR
Figure 16 Figure 17
1. Remove the cabinet.
2. Remove the screw which fastens the terminal cover.
3. Disconnect the lead wire from the overload protector
or P.T.C. assembly.
4. Remove the overload protector (O.L.P) or P.T.C.
assembly. (See Figure 19.)
ROTARY COMPRESSOR
1. Remove the cabinet. (See Page 19).
2. Remove the refrigerant by using arefrigerant
Recovery System.
3. Unbraze the suction and discharge tubes at the
compressor connections.
4. Remove the compressormounting bolts. (See Figure29.)
5. Remove the compressor. (See Figure 20.)
Figure 19
Reciprocating Compressor Models
Figure 20
Rotary Compressor Models
11

HOW TO REPLACE THE
REFRIGERATION SYSTEM
1. Recover the refrigerant in accordance with EPA
requirements.
2. Remove the desired component, and unbraze the pinch-
off tubes.
3. Solder the service valves onto the pinch-off tube ports,
leaving the valves open.
4. Solder the pinch-off tubes to the service valves.
5. The valve must be closed and left in place for any
subsequent procedures.
6. Evacuate as follows.
1) Connect the vacuum pump, as illustrated in Figure
21A.
2) Start the vacuum pump, slowly open manifold
valves A and B two full turns counterclockwise,
and leave the valves open. The vacuum pump is
now pulling through valves A and B up to valve C
by means of the manifold and entire system.
To keep the oil from foaming and being drawn into the
vacuum pump, just crack valves A and B for a few
minutes, then slowly open two full turns
counterclockwise.
3) Operate the vacuum pump until 600 microns of
vacuum is obtained (20 to 30 minutes). Close
valves A and B, and observe the vacuum gauge
for a few minutes. A rise in pressure indicates a
possible leak, or moisture remaining in the system.
With valves A and B closed, stop the vacuum
pump.
4) Remove the hose from the vacuum pump and
place it on the charging cylinder. (See Figure 21B.)
Open valve C. Discharge the line at the manifold
connection.
5) The system is now ready for final charging.
7. Recharge as follows :
1) Sealed systems are charged from the high-side. If
the total charge cannot be put in the high-side, the
balance should be introduced thorough the suction
line access valve which you installed as the
system was opened.
2) Connect the charging cylinder as shown in Figure
21B. With valve C open, disconnect the hose at
the manifold connection.
3) Open valve A and allow the proper charge to enter
the system. Valve B should remain closed.
4) If more charge is required and the high-side will
not take it. Close valve A.
5) With the unit running, open valve B and add the
balance of the charge.
a. Do not add the liquid refrigerant to the low-side.
b. Watch the low-side gauge; allow pressure to
rise to 30 lbs.
c. Turn offvalve B and allow pressure to drop.
d. Repeat steps B and C until the balance of the
charge is in the system.
6) When satisfied that the unit is operating correctly,
use the pinch-off tool with the unit still running and
clamp on the pinch-offtube. Using a tube cutter,
cut the pinch-off tube about two inches from the
pinch-off tool. Use sil-fos solder, and solder the
pinch-off tube closed. Turn the unit off and allow it
to set for a while, and then test for leakage.
* CAUTION: Check the refrigerant type
before charging the system.
12

Equipment needed: Vacuum pump, charging cylinder, manifold gauge, brazing equipment; pinch-off tool capable of
making a vapor-proof seal, leak detector, tubing cutter; hand tools to remove components, and service valve.
EVAPORATOR ASSEMBLY
(LOW PRESSURE SIDE)
CONDENSER ASSEMBLY
(HIGH PRESSURE SIDE)
COMPOUNDGAUGE
MANIFOLD,
GAUGE
=.
I
EVAPORATOR ASSEMBLY
(LOW PRESSURE SIDE)
CONDENSER ASSEMBLY I
(HIGH PRESSURE SIDE)
COMPOUNDGAUGE
MANIFOLD.
GAUGE
1
I
|
1
EXTERNAL
VACUUM PUMP
Figure 21A - Pulling Vacuum
k
I
I
mm=
LOW HI
Figure 22B - Charging
13

TROUBLESHOOTING GUIDE.
Dehumidifier does not dry
the air as itshould.
_.[T ifier is unplugged. ,._ Make sure lhe dehumidifier's plug is I
...._!'edehumi'd_........................... PU2he._J_c°m.p.!e!tlYt_nt° !he °ut!et: .............!
_The fuse is blown/circuil _ Check the house fuse/circuit breaker 1
b!eake[ s t[pped. ...... _ - I box and replace the fuse or reset [
.................................thebreaker.:....................................I
_,] replace Pr.°.pe.r!Y
J Bucket is not in the proper _ Make sure the slots on both sides of
_/ position and light is on. _ - Ithe bucket are positioned correctly.
_-_ Check wiring Replace wiring,
I ........_ The control may not be set high _ Turn the Humidity Control knob to a
/ 1, r
_Room is toe low, _ Moisture removal is best at higher
temperature room temperatures.
Lower room temperatures will reduce
the moisture removal rate.
This unit is designed to be operated
at temperatures above 65 'F(18°C)
--I w
Airflo is r tri ted. Make sure there are no curtains,
...............................................................................blinds or furniture blocking the front
or back of the dehumidifier.
_ Doors and windows may _ Check that all doors, windows and
n°_.be c!°sed2!gh!'Y: Ii " I othe[openings,oa[esocu:o!y c!tsed:
Ineffec!t ve de!ur,,n!di.lyi,ng Check for refrigerant leaks. H Repair leak.
1_.{ Clean the air filter.Is the filter dirty? .........................................................................................
i_1 Check: if the unit is securely _ Set and use the dehumidifier at a
'_°!'S2................................................................._°£iti°fftd:................................................I - Ittu[_,•[[tt:=_t=?d'_X1!,.£'ff£,_:
14

CAUSE
No power
Poor plug contact at cutlet.
Bucket is full.
Humidity control is at Off position
Wire disconnect or loose
CONDITION
1. Dehumidifier does net start. (Both
compressor and fan motor do not
operate.)
Capacitor
(Discharge capacitor beforetesting.)
2. Motorrunsbutcompressordoesnot
run. Voltage (115V _+10%)
Wiring
REMEDY
Check powersupply at outlet.
Correct if none.
Installplug properly or replace it.
If Auto Shut Offlights, empty the bucket
and replace properly.
Turn the humidity control switch toward
Max.
Connect wire. Refer to wiring diagram for
terminal identification. Repairor replace
loose terminal.
Testcapacitor,
Replace if not within ±10% of
manufacturer's rating. Replace if shorted,
open, or damaged.
Itmust be between 103.5V and 126,5V, If
not within limits, call an electrician
Check the wire connections: If loose,
repair or replace the terminal. If the wires
are disconnected, referto wiring diagram
tar identification, and replace the wires.
Check the wire connections; If not
according to the wiring diagram, correct
the connections.
Rotary switch Check for continuity, refer to the wiring
diagram for terminal identification. Replace
the switch if the circuit is open.
Defrost control
Capacitor
(Discharge capacitor before servicing.)
The Defrost Control senses frost build-up
on the evaporator coil and automatically
shuts off the compressor, The fan .
continues to ran,drawing air across the
coil, and meltingthe frost. When the coil is
defrosted, the compressor automatically
restarts, anddehumidifying resumes.
Check the capacitor,
Replace if not within _+10%of
manufacturer's rating. Replace if shorted,
open, or damaged.
Compressor Check the compressor for open circuit or
ground. If openor grounded, replace the
compressor.
Overload protector (O.L.P.) Check the compressor O.L.P. if exlernally
mounted. Replace if open. (If the
compressor temperature is high, remove
O.L,P., cool, and retest.)
I Defrost control is defective.
Low relativehumidity
Poor air circulation
3. Does not defrost control. Check defrost control, replace it.
4. Insufficient dehumidificalion Turn dehumidifier oft.
Movedehumidifier toobtain free and
unobstructed aircirculation.
Coils clogged with dust and dirt. Cleanevaporatorand!orcondenserassemb(y
Air filter is dirty. Clean it,
Motor is not operating. CheckMotor,repairor replace it.
15

CONDITION CAUSE
5, Noisyoperating Fan
6, Water drips
7. Compressor cycles on ovedoad
protector. (O.LP)
Tube hitsframe.
Fan blade bits frame
Internalcompressor nobse.
Loose set screws
Worn bearings of MotorAssembly
]-he bucket is not installedproperly.
Connection may be loose.
Leak in bucket
Water drips when bucket removed for
emptying,
Bucketoverflows.
High or low line voltage. (115V _+10%)
Poor air circulaiJon
Coils clogged with duct and dirt.
Motor
Bad P.T.C. assembly (if assembled)
Short circuit or ground in electrical circuit
Unit pressures not equalized
Capacitor
Wiring
Refrigeration system
Stuck compressor
Overload protector (O.L.P.)
REMEDY
Ifcracked, out of balance, or partially
missing,replace it
Adjust tubing routine carefully.
Check Motor Mount. If loose, tighten it.
Replacecompressor.
Tighten them.
]f knocking sounds continue when running
or loose, replace the motor. If the motor
hums or noise appears to be internal while
running, replace motor assembly.
The bucket should be properly positioned
on the hangers ofthe drain pan.
Check connection and repair.
Replace bucket.
Before removhngbucket, the unit should
be turned off.
Check microswitch and float.
Check line voltage. Itmust be between
103.5Vand 126.5V volts,
If intermittent provide newsupply.
Move dehumidifier forfree and
unobstructed airflew.
Clean the coils,
If not running, determine the cause
Replaceif required.
Check P.T,C., Repair.
Check electricalcircuit. Repair.
Allow 3 to 5 minutes for pressure to
equalize before starting the compressor.
Testthe capacitor.
Check the terminals. Ifloose, repair or
replace.
Checkthe system for a restriction.
Checkcompressor, replace compressor
Check O.L.P,.if e×ternaily mounted,
Replaceifopen. tit the compressor
temperature is high, remove the O.LP.,
cool, and retest.)
16

CIRCUIT DIAGRAM
• MODEL: DH30
•MODEL: DH40/DH50
f
SWITCH
ROTARY MAIN PCB
WH{BL) (N1
O.L.P FUSE 250VT2A
BK(BR)(L}
o HUMIDITY
CONTROL
13 S,'W
BUCKET
FULL
BUCKET
CN-BEN S#,N HUiVl_DITY
THERMISTOR 1
WIRING DIAGRAM
17

5. EXPLODED VIEW - INTRODUCTION
• MODEL: DH30
I
I
I
=.= 18

• MODEL: DH40
19

• MODEL: DH50
I
I
20