Hoshizaki 73202 User Manual

Hoshizaki America, Inc.

Hoshizaki

Cubelet Icemaker/Dispenser

Models
DCM-270BAH(-OS)

F-A Control Board Models

“A Superior Degree

of Reliability”

www.hoshizaki.com

SERVICE MANUAL

Number: 73202
Issued: 5-6-2014
Revised: 7-2-2014

WARNING

Only qualied service technicians should install and service the icemaker. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the icemaker in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.

Hoshizaki provides this manual primarily to assist qualied service technicians in the service
and maintenance of the icemaker.

Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical Support
Department for assistance.

Phone: [phone]
Fax: [phone]

E-mail: [e-mail]

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number ________________________

• Serial Number ________________________

• Complete and detailed explanation of the problem.

2

IMPORTANT

This manual should be read carefully before the icemaker is serviced. Read
the warnings and guidelines contained in this booklet carefully as they provide
essential information for the continued safe use, service, and maintenance of the
icemaker. Retain this booklet for any further reference that may be necessary.

CONTENTS

Important Safety Information ................................................................................................. 5

I. Construction and Water Refrigeration Circuit Diagrams ..................................................... 7

A. Construction .................................................................................................................. 7

B. Water/Refrigeration Circuit Diagrams ............................................................................ 8

II. Sequence of Operation and Service Diagnosis ................................................................. 9

A. Sequence of Operation Flow Chart ............................................................................... 9

B. Service Diagnosis ....................................................................................................... 10

C. Control Board Check ................................................................................................... 14

D. Bin Control Check ....................................................................................................... 23

E. Float Switch Check and Cleaning ............................................................................... 24

F. Diagnostic Tables ......................................................................................................... 26

III. Controls and Adjustments ............................................................................................... 29

A. Control Board Layout .................................................................................................. 30

B. LED Lights and Audible Alarm Safeties ....................................................................... 32

C. Settings and Adjustments ............................................................................................ 33

1. Default Dip Switch Settings .................................................................................... 33

2. Bin Control Shutdown Delay (Infrared Sensor) (S1 dip switch 1, 2, 3) .................. 33

3. Drain Frequency Control (S1 dip switch 4) ............................................................ 33

4. Continuous Dispensing Timer (S1 dip switch 5 & 6) .............................................. 34

5. Bin Control Selector (S1 dip switch 7) ................................................................... 34

6. Bin Control Shutdown Delay (S1 dip switch 8) ...................................................... 34

7. Factory Use (S1 Dip Switch 9 & 10) ....................................................................... 34

D. Switches ...................................................................................................................... 35

IV. Removal and Replacement of Components ................................................................... 36

A. Service for Refrigerant Lines ....................................................................................... 36

1. Refrigerant Recovery ............................................................................................. 37

2. Brazing .................................................................................................................. 37

3. Evacuation and Recharge (R-404A) ...................................................................... 37

B. Important Notes for Component Replacement ............................................................ 38

C. Icemaking Unit ............................................................................................................ 40

1. Upper Bearing Wear Check .................................................................................. 40

2. Removal and Replacement of Extruding Head ...................................................... 41

3. Removal and Replacement of Auger ..................................................................... 41

4. Removal and Replacement of Evaporator ............................................................. 42

5. Removal and Replacement of Mechanical Seal and Lower Housing ................... 43

6. Removal and Replacement of Gear Motor ............................................................ 45

3

V. Maintenance .................................................................................................................... 46

VI. Preparing the Icemaker for Periods of Non-Use ............................................................. 47

VII. Disposal ......................................................................................................................... 48

VIII. Technical Information .................................................................................................... 49

A. Specication and Performance Data ........................................................................... 49

1. DCM-270BAH ........................................................................................................ 49

2. DCM-270BAH-OS ................................................................................................. 50

B. Wiring Diagrams .......................................................................................................... 51

1. DCM-270BAH(-OS) ............................................................................................... 51

2. DCM-270BAH(-OS) ............................................................................................... 52

4

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the

appliance or property.

IMPORTANT Indicates important information about the use and care of the

appliance.

WARNING

The appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.

To reduce the risk of death, electric shock, serious injury, or re, follow basic
precautions including the following:

• Only qualied service technicians should install and service the appliance.

• The appliance must be installed in accordance with applicable national, state, and
local codes and regulations.

• The appliance requires an independent power supply of proper capacity. See the
nameplate for electrical specications. Failure to use an independent power supply
of proper capacity can result in a tripped breaker, blown fuse, damage to existing
wiring, or component failure. This could lead to heat generation or re.

• THE APPLIANCE MUST BE GROUNDED: The appliance is equipped with a
NEMA5-15 three-prong grounding plug to reduce the risk of potential shock
hazards. It must be plugged into a properly grounded, independent 3-prong wall
outlet. If the outlet is a 2-prong outlet, it is your personal responsibility to have a
qualied electrician replace it with a properly grounded, independent 3-prong wall
outlet. Do not remove the ground prong from the power cord and do not use an
adapter plug. Failure to properly ground the appliance could result in death or serious
injury.

• Do not use an extension cord.

• To reduce the risk of electric shock, do not touch the control switch or plug with damp
hands. Make sure the control switch is in the "OFF" position before plugging in or
unplugging the appliance.

• Do not use an appliance with a damaged power cord. The power cord should not
be altered, jerked, bundled, weighed down, pinched, or tangled. Such actions could
result in electric shock or re. To unplug the appliance, be sure to pull the plug, not
the cord, and do not jerk the cord.

5

WARNING, continued

• Do not make any alterations to the appliance. Alterations could result in electric
shock, injury, re, or damage to the appliance.

• Do not place ngers or any other objects into the ice discharge opening.

• The appliance is not intended for use by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.

• Young children should be properly supervised around the appliance.

• Do not climb, stand, or hang on the appliance or appliance door or allow children or
animals to do so. Serious injury could occur or the appliance could be damaged.

• Do not use combustible spray or place volatile or ammable substances near the
appliance. They might catch re.

• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance
could cause harm to individuals or damage to the appliance.

NOTICE

• Follow the water supply, drain connection, and maintenance instructions carefully to
reduce the risk of costly water damage.

• In areas where water damage is a concern, install in a contained area with a oor
drain.

• Install the appliance in a location that stays above freezing. Normal operating
ambient temperature must be within 45°F to 100°F (7°C to 38°C).

• Do not leave the appliance on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the appliance for
these occasions, follow the instructions in "VI. Preparing the Appliance for Periods of
Non-Use."

• Do not place objects on top of the appliance.

• The storage bin is for ice use only. Do not store anything else in the storage bin.

6

I. Construction and Water Refrigeration Circuit Diagrams

A. Construction

DCM-270BAH

DCM-270BAH-OS

7

B. Water/Refrigeration Circuit Diagrams

DCM-270BAH(-OS)

Inlet Water Valve

Water
Supply

Reservoir

Overow

Water Level

Float
Switch

Evaporator

Bin

Bin Drain
Hose

Thermostatic
Expansion Valve

Evaporator Water
Supply Hose

Drier

Fan

Air-Cooled Condenser

Gear Motor

High-Pressure Switch

To Drain

Drain Valve

To Drain

Dispense Water Valve

Refrigeration Circuit

Water Circuit

Compressor

8

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1-beep alarm continues

WV energized

GM de-energized

When UFS closes,

alarm resets and

2. Ice Purge Cycle

Low Water Safety

90 sec. FT exceeded

starts.

1-beep alarm sounds

90 sec. PT starts

PT

90 seconds

terminates

exceeded

FT

1-beep alarm sounds

PT starts

UFS open

WV energized

Comp de-energized

FM de-energized

GM energized

Legend:

BC-bin control

Comp-compressor

DC-drain cycle

DT-drain timer

DV-drain valve

FM-fan motor

FT-ll timer (low water safety)

GM-gear motor

LFS-lower oat switch

PT-purge timer

UFS-upper oat switch

WV-inlet water valve

3. Freeze Cycle

DCM-270B_H(-OS)

1-in-1 drain cycle. DV energizes for 2 seconds every hour

"F-A" Control Board Sequence Flow Chart

4. 1-in-12 Drain Cycle - Although the factory default 1-in-1 drain cycle

is recommended, a 1-in-12 drain cycle is available. For 1-in-12 drain

cycle sequence, see "3. 1-in-12 Drain Cycle & Restart (optional)."

2. Ice Purge Cycle

To bypass, press the

Rell

(S1 Dip Switch 4).

Does not affect operation.

"SERVICE" button after

GM starts.

Maximum

90 seconds

5 minutes 5 sec.

LFS closed

UFS closed

UFS open

LFS open

Comp energized

FM energized

GM energized

FT terminates

WV de-energized

Comp energized

FM energized

FT starts (90 sec.)

WV energized

Comp energized

FM energized

GM energized

GM energized

GM energized

3. Icemaker Restart

2. Icemaker Off

1. Bin Full

to "2. Ice Purge Cycle" above

Ice level lowered

6 to 10 sec.

BC closed

(BC large balance plate disengaged)

All Components de-energized

to "1. Fill Cycle" above

4. Icemaker Restart

10-min. DT terminates

DV de-energized

1-in-12 DT reset

3. 10-Minute Drain

DV energized

GM de-energized

5 minutes

2. Ice Purge Cycle
Comp de-energized

FM de-energized

GM energized

LFS closed

UFS closed

FT terminates

WV de-energized

BC open

(BC large balance

Maximum

Power Switch "ON"

Control Switch in "ICE"

1. Startup

90 seconds

WV energized

FT starts (90 sec.)

"POWER OK" LED on

If Fill > 90 sec. FT

1-beep alarm sounds

WV energized

When UFS closes

alarm resets and

2. Ice Purge Cycle starts.

2. Bin Control

1. Fill Cycle

plate engaged)

Shutdown & Restart

1. DT Initiates DC

(S1 dip switch 4)

&Restart(optional)

3. 1-in-12 Drain Cycle

9

B. Service Diagnosis

WARNING

• The appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.

• Risk of electric shock. Use extreme caution and exercise safe electrical practices.

• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the appliance is serviced. Make sure that none have fallen
into the storage bin.

• Make sure all food zones in the appliance are clean after service. For cleaning
procedures, see the instruction manual or the maintenance label.

1. Ice Production Check

To check ice production, remove the front, top, and left side panels. Place a container
under the spout and dispense all ice from the icemaker. Note: The ice dispense switch
times out after 20 sec. Re-engage every 20 sec. until bin is empty. Move the control
switch and power switch to the "OFF" position. Remove the bin top cover. Pour warm
water over the remaining ice. After the ice is removed/melted, place the bin top cover
in its original position. Do not secure at this time. Remove the control box cover, then
move the control switch to the "ICE" position and the power switch to the "ON" position.
Once the gear motor starts, press the "SERVICE" button on the control board (located
in the control box). WARNING! Risk of electric shock. Care should be taken not to

touch live terminals. Lift the bin top cover and monitor the evaporator extruding head.
WARNING! Keep hands, hair, and loose clothing clear of the agitator rotating
inside of the storage bin. Once ice begins to ll the bin, start a 10 min. timer. After

10min., move the power switch to the "OFF" position. Place an empty container under
the spout and dispense all ice from the icemaker. Note: The ice dispense switch times
out after 20 sec. Re-engage every 20sec. until bin is empty. Move the power switch to
the "OFF" position. Weigh the ice to establish the batch weight (minus the weight of the
container). Multiply the batch weight by 144for the total production in 24 hr. Replace the
control box cover and bin top cover in their original positions and secure. Replace all
panels in their original positions and secure. Move the power switch to the "ON" position
to start the automatic icemaking process.

10

2. Diagnostic Procedure

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation, adequate
water pressure (10 to 113 PSIG), and proper voltage per unit nameplate.

Note: • When checking high voltage (115VAC), always choose a neutral (W) wire to

establish a good neutral connection.

• When checking low voltage (24VAC), always choose a neutral (LBU) wire.

• When checking control board DC voltage (5VDC), always place the red positive
test lead from the multimeter to CB K5 pin closest to CB K4 connector.
See "II.C. Control Board Check."

• To speed up the diagnostic process, the 5-min. ice purge cycle may be bypassed
by pressing the "SERVICE" button on the control board after the gear motor
starts. WARNING! Risk of electric shock. Care should be taken not to touch

live terminals.

1) Move the power switch to the "OFF" position, then disconnect the power cord from the
electrical outlet. Remove the front, top, and left side panels. Remove the control box
cover.

2) Reconnect the power cord into the electrical outlet, then move the power switch to the
"ON" position.

3) Move the control switch to the "DRAIN" position. CB "POWER OK" LED and "FLUSH"
(drain) LED turns on.
Diagnosis "POWER OK" LED: Check that CB "POWER OK" LED is on. If not, check
for 115VAC at control transformer brown (BR) wire to neutral (W). If 115VAC is not
present, check the power switch, power cord connection, and breaker. If 115VAC is
present, check control transformer continuity. Replace as needed. Next, check for
24VAC at control transformer red (R) wire to neutral (LBU). If 24VAC is not present,
check control transformer continuity. Replace as needed. If 24VAC is present, check
24VAC 1A fuse. If fuse is good, check for 24VAC at CB K8 #1 (W/R) to CB K8 #2 (LBU).
If 24VAC is present and "POWER OK" LED is off, replace CB.
Diagnosis DV: If DV does not energize, check for 24VAC at CB K2 #10 (W/DBU) to
neutral (LBU). If24VAC is not present, check control switch continuity. If open while in
the "DRAIN" position, replace control switch. If closed, check for 0VDC at control board
K9 #1 (W/BK) to K9 #2 (W/BK). If5VDC is present and control switch is closed, replace
CB. If 24VAC is present, check for restricted DV and DV solenoid continuity. Clean or
replace as needed.

3) After all of the water has drained, move control switch to the "ICE" position.

11

4) Fill Cycle – "WTRIN" LED is on. WV energizes. The 90-sec. low water safety timer
begins. LFS closes. Nothing occurs at this time. The reservoir continues to ll until
UFS closes, terminating the 90-sec. low water safety timer, starting the 30-min. freeze
timer, and de-energizing WV. Diagnosis: Check that "WTRIN" LED turns on and water
lls the reservoir. If not, check for water supply line shut-off valve closed, restricted
water lters, and restricted WV screen. Next, check for 24VAC at CB K2 #8 (W/BR)
to neutral(LBU). If 24VAC is not present, replace CB. If 24VAC is present, turn off the
power switch, disconnect the WV wires and check WV solenoid continuity. If open,
replace WV. Reconnect WV wires, move the power switch to the "ON" position, then
check that DV is not leaking by. Check that WV shuts off when UFS closes.
Note: Low Water Safety– If UFS remains open 90 sec. after WV energizes, a 1-beep

alarm sounds. This alarm resets automatically once UFS closes.

5) Ice Purge Cycle – "GM" LED is on. 5-sec. GM delay timer and 30-min. freeze timer
start. WV de-energizes and "WTRIN" LED turns off. Once the 5-sec. GM delay timer
terminates, GM and CDR energize. CDR cannot energize unless GM circuit is complete
(fuse, internal protector, and windings). Once CDR energizes, CB K9 #5 W/O and
CB K9 #6 W/O 5VDC circuit closes and 5-min. ice purge timer starts. See "II.C.3)c.
Compressor Delay Relay (5-min. Ice Purge Timer Circuit)." If CDR de-energizes, CB
K9#5 W/O and CB K9 #6 W/O circuit opens and an 8-beep alarm occurs. See "III.B.
LED Lights and Alarm Safeties." Note: To bypass ice purge cycle and go straight to
freeze cycle, press "SERVICE" button on CB during 5-sec. GM delay time.
Diagnosis CB: Check that UFS closed, WV LED turned off and WVde-energized.
IfUFS is closed, "WV" LED is off, and "GM" LED is off, replace CB. If "GM" LED is
on and GM is off, conrm 115VAC at CB K1 #2 (BR) to neutral(W). If115VAC is not
present, check for loose connection from power switch. If 115VAC is present, check for
115VAC at CB K1 #3 (BK) to neutral (W). If115VAC is not present, replace CB.
Diagnosis GM: If115VAC is present at CB K1 #2 (BR) to neutral(W), check GM fuse,
GM capacitor, GM windings, and GM coupling between auger and GM.
Diagnosis CDR: See "II.C.3)c. Compressor Delay Relay (5-min. Ice Purge Timer
Circuit)." Once 5-min. ice purge timer terminates, freeze cycle begins.

6) Freeze Cycle – "COMP" LED is on. 5-min. ice purge timer terminates or "SERVICE"
button pressed. "COMP" LED turns on. "GM" LED remains on. Comp and FM energize.
GM and CDR continue. Ice production begins 4 to 6 minutes after Comp energizes
depending on ambient and water conditions. Diagnosis Comp: Check that "COMP"
LED is on and that Comp energizes. If "COMP" LED is off, conrm 5-min. ice purge
timer has terminated. Check for 0VDC across CB K9 #3 (W/O) and CB K9 #5 (W/O).
If 5VDC is present, CDR contacts are open. Check for 115VAC at CDR #7 (O) to CDR
#8 (W). If115VAC is present, check CDR continuity between CDR #3 (W/O) and
CDR #5 (W/O). If open, replace CDR. If closed and"COMP" LED remains off, replace
CB. If"COMP" LED is on and Comp is off, check for 115VAC at each CB X1 brown
(BR) wire to neutral(W). If 115VAC is present on one and not the other, replace CB.
If115VAC is present on both, check Comp windings, start relay, and capacitors.
Note: If CDR de-energizes, CB K9 #5 W/O and CB K9 #6 W/O circuit opens, Comp
de-energizes and an 8-beep alarm occurs. See "III.B. LED Lights and Alarm Safeties."
Diagnosis FM: If FM does not energize, check FM capacitor, windings, and bearings.

12

7) Rell Cycle/Low Water Safety – As ice is produced, the water level in the reservoir
drops. UFS opens. Nothing occurs at this time. When LFS opens, WV energizes,
90-sec. low water safety timer (ll timer) starts. Comp, GM, CDR, and FM continue.
When UFS closes, WV de-energizes, 90-sec. low water safety timer (ll timer)
terminates and 30-min. freeze timer resets. If UFS remains open 90 sec. after WV
energizes (ll timer exceeded), a 90-sec. shutdown cycle starts. Comp and FM
de-energize and CB signals a 1-beep alarm every 5 sec. 90-sec. ice purge timer
starts. GM and CDR continue to clear ice from the evaporator. 90-sec. purge timer
terminates, GM and CDR de-energize. WV and 1-beep alarm continue until UFS closes.
Diagnosis– Check that "WTRIN" LED is on. If not, check LFS. See "II.E. Float Switch
Check and Cleaning." If LFS is open and "WTRIN" LED is off, replace CB. If "WTRIN"
LED is on, check that the reservoir lls. If not, check the water supply line, restricted
water lters, WV solenoid, restricted WV screen. If WV is energized and rell exceeds
90-sec. low water safety timer (ll timer), check DV leaking by or open UFS.
See "II.E.Float Switch Check and Cleaning."
Note: Each time UFS closes, 30-min. freeze timer starts. The 30-min. freeze timer resets

when UFS closes again. If UFS does not close again within 30 min., CB shuts
down the unit and sounds a 5-beep alarm every 5 sec. See "II.B. LED Lights and
Alarm Safeties."

10) Shutdown – Bin lls with ice activating BC microswitch. Within 10 sec. control
board shutsdown unit. Diagnosis: Check that BC large balance plate is activated
and not sticking. Check BC microswitch continuity. When BC large balance plate is
down (icemaking), BC microswitch is closed. When BC large balance plate is up BC
microswitch is open. If not, replace BC microswitch. If BC microswitch is open and
Comp, FM, and GM do not de-energize, replace CB. See "II.C. Control Board Check
Procedure."

Legend: BC–bin control; CB–control board; CDR–compressor delay relay;

Comp–compressor; CT–control transformer; DV–drain valve; FM–fan motor;
GM–gear motor; LFS–lower oat switch; UFS–upper oat switch; WV–inlet water

valve

13

C. Control Board Check

Before replacing a CB that does not show a visible defect and that you suspect is bad,
always conduct the following check procedure. This procedure will help you verify your
diagnosis. Before proceeding, check for proper voltage per appliance nameplate. Check
that the 24VAC 1A fuse and 115VAC 3A GM breaker are good.

• Check the S1 dip switch settings to assure that they are in the factory default position.
For factory default settings, see "III.C.1. Default Dip Switch Settings." S1 dip switch
7determines bin control application. WARNING! Do not adjust S1 dip switch 7 out

of the factory default position. This dip switch must be left in the factory default
position or the appliance will not operate correctly.

• When checking for 115VAC high-voltage (primary), always choose a 115VAC
neutral(W) to establish a good neutral connection.

• When checking for 24VAC low-voltage (secondary), always choose a 24VAC
neutral(LBU) to establish a good neutral connection. If the appliance is in alarm, see
"III.B. LED Lights and Audible Alarm Safeties."

• When checking for 5VDC, use CBred K4 connector pin closest to CB black
K3connector for DC ground (GND).

14

1) Startup-"POWER OK" LED on: Move control switch to "ICE" position, then move
power switch to "ON" position. "POWER OK" LED turns on. "POWER" LED remains
on unless power supply is interrupted. NOTICE!Appliance will not start unless the
safety switch is engaged. Diagnosis: Checkthat "POWER OK" LED is on. If not,
check for proper 115VAC supply voltage to CT (main breaker or fuse and power switch).
Next, check for proper 24VAC output from CT. Next, check that 1A fuse is good. Check
for 24VAC from CB K8connector pin #1 (W/R) to CB K8 connector pin #2(LBU).
If24VAC is present and "POWER OK" LED is off, replace CB.

2) 5VDC Output Checks: There are seven 5VDC circuits on the appliance.

a) 3 circuits at CB K9 connector: Control switch "DRAIN" position, high-pressure switch

(HPS), and compressor delay relay (CDR).

b) 2 circuits at CB K8 connector: Bincontrol (BC) and oat switch (FS upper and

lower).

c) 2 circuits at CB K7 connector: Ice dispense (push button, and OS sensor), and water

dispense (push button and OS sensor).

2a) 5VDC CB K9 Connector: See Fig. 1.

5VDC CB K9 Connector

Component Pin # (Wire Color)

Control Switch "DRAIN" Position #1 (W/BK) and #2 (W/BK)

High-Pressure Switch (HPS) #3 (Y) and #4 (Y)

Compressor Delay Relay (CDR)
(CDR relay terminals #3 W/O and #5 W/O)

#5 (W/O) and #6 (W/O)

Red positive test lead to
redK4 connector pin closest

to black K3 connector

Red Positive
Test Lead

Multimeter

5VDC

Black Negative
Test Lead

Control Board K9 Connector

Fig. 1

"DRAIN" Position on
Control Switch
(W/BK)

High-Pressure Switch (HPS) (Y)

Compressor Delay Relay (CDR)
CDR Terminals #3 (W/O) and #5 (W/O)

15

2a) 5VDC CB K9 Connector Continued:

a) Control Switch"DRAIN" Position

CB K9 connector pins #1 (W/BK) and #2 (W/BK):

• "ICE" Position: When the control switch is in the "ICE" position, CB K9 connector
pin#1and pin #2are open. 5VDC is present between CB K9 connector
pin #1(W/BK) and pin #2 (W/BK). If not, conrm 5VDC between pin#1 (W/BK) and
CBred K4 connector, pin closest to CBblack K3connector. If 5VDC is not present,
replace CB.

• "DRAIN" Position: When control switch is in the "DRAIN" position, CB K9 connector
pin #1 (W/BK) and pin#2(W/BK) are closed. 5VDC is present between both CB
K9connector pin #1(W/BK) and pin#2 (W/BK) to CBred K4connector, pin closest
to CB black K3 connector. If 5VDC is not present, replace CB.

b) High-Pressure Switch (HPS)

CB K9 connector pins #3 (Y) and #4 (Y): When HPS is closed, 5VDC is present
between both CB K9 connector pins #3(Y) and pin #4 (Y) to CB red K4 connector
pin closest to CB black K3 connector. If5VDC is not present on pin #3 (Y) or pin
#4(Y), replace CB. If 5VDC is present on CBK9connector pin #3 (Y) and not on CB
K9connector pin #4 (Y), HPS is most likely open. CB sounds a 3-beep alarm. Check
HPS continuity. If HPS is open and CB is not in alarm, replace CB.

c) Compressor Delay Relay (CDR)

CB K9 connector pins #5 (W/O) and #6(W/O): When CDR is de-energized (GM off),
CDRterminals #3 and #5 are open and 5VDC is present between CBK9connector
pin #5 (W/O) and CBK9connector pin #6(W/O). If5VDC is not present, check CDR
continuity between terminals #3 and #5. If open, replaceCB. When CDR is energized,
CDR terminals #3 and #5close and 0VDC is present between CB K9 connector pin
#5 (W/O) and pin #6(W/O). 5VDC is present between CB K9 connector pin #5 (W/O)
to CB red K4 connector pin closest to CB black K3connector and CB K9 connector
pin #6 (W/O) to CB red K4 connector pin closest to CB black K3connector. If GM is
energized and CDR terminals #3& #5 are open, an 8-beep alarm occurs. See "III.B.
LED Lights and Audible Alarm Safeties." If CDR terminals #3 and #5 are closed
and 0VDC is present between CB K9 connector pin #5 (W/O) and pin #6(W/O),
5-min. Comp delay timer starts. IfComp does not energize after 5-min. delay timer
terminates, replace CB.

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