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AM3 Dishwasher installation and operation manual
Hobart Food Equipment Co., Ltd.
FORM 743423-2E
TABLE OF CONTENTS
GENERAL……………………………………………………………1
INSTALLATION……………………………………………………2
Location……………………………………………………………………………2
Convert from straight-through to corner operation………………………3
Electrical connections……………………………………………………………4
Plumbing connections……………………………………………………………6
OPERATION………………………………………………………7
Controls……………………………………………………………………………7
Preparation…………………………………………………………………………7
Dishwashing………………………………………………………………………8
MAINTENANCE……………………………………………………9
MACHINE CLEANING……………………………………………9
TROUBLESHOOTING……………………………………………10
Appendix 1: Circuit Diagram
Appendix 2: Electrical Wiring Connection Layout
Appendix3: Installation guide
Appendix4: Control board chart
AM3 Dishwasher Installation & Operation Manual
Installation, Operation, and Maintenance of
AM3 DISHWASHERS SAVE THESE INSTRUCTIONS
GENERAL
The AM3 dishwashers are semi-automatic rack-type machines. Three doors open at the same time to allow the rack to be pushed in or out. After filling, an automatic wash and rinse cycle begins when the door is lowered.
Dish table heights may be specified at time of order for 800mm (31.5 inches) or 860mm (33.875 inches).
Electric booster heat options (7kW or 14kW) include an open vented booster tank supplied with a solenoid valve, line strainer, rinse pump and type “A” air gap. Low water protection is provided in the boosters. No booster versions are also available for connection to external heating.
1
AM3 Dishwasher Installation & operation Manual
INSTALLATION Before installing, check the electrical service to be sure it agrees with the electrical specifications on the data plate located on the right side of machines.
Immediately after unpacking, check for possible shipping damage. If the dishwasher is found to be damaged, save the packaging material and contact the carrier or supplier within 15 days of delivery.
LOCATION
Place the dishwasher in its operating location. Before finalizing the location, make sure that consideration has been given for the electrical conduit, water supply, drain connection, gas booster location (if applicable), tabling, chemical feeder replenishment (if applicable), daily cleaning, maintenance and adequate clearance for opening the doors (Fig. 1).
E BETWEEN WALL AND MACHINE IS AT LEAST 100 MM
H TABLE
DRAIN
FILL HOSE
WALL
WALL
THE SPAC
DIS
Fig12
AM3 Dishwasher Installation & Operation Manual
The dishwasher must be level before any connections are made. Turn the leveling feet as required to level the machine and adjust to the desired height.
Dish table should be turned down and fitted into the dishwasher (Fig.2). Use a suitable sealer between table and tank lip to prevent leakage.
A hood or vent may be required in order to meet local codes. The ventilation volume should be more than 2.8m3/min t (supplied by others).
TO PREVENTAGE
CONVERT FROM ST
For corner operation, guide on the side and
STRAIGHT-TH
in case of using hood or ven
SEALLEAK
DISH TABLE
Fig. 2
RAIGHT-THROUGH TO CORNER OPERATION
remove the rack guide and baffle (Fig.3) from the front, assemble the rack use screws to re-install the baffle in the front.
ROUGH CORNER
RE-INSTALL BAFFLE HERE
RACK GUIDE
Fig. 3
3
AM3 Dishwasher Installation & operation Manual
ELECTRICAL CONNECTIONS WARNING:ELECTRICAL AND GROUNDING CONNECTIONS MUST COMPLY WITH
APPLICABLE PORTIONS OF THE NATIONAL ELECTRICAL CODE AND/OR OTHER LOCAL CODES.
WARNING: DISCONNECT THE ELECTRICAL POWER SUPPLY AND PLACE A TAG AT THE DISCONNECT SWITCH INDICATING THAT YOU ARE WORKING ON THE CIRCUIT.
Refer to the electrical diagram on the inside of side panel. Connect the electrical supply wires with different colors to terminal block (Fig. 4).
No Booste
Min. CircuAmpacity / M
Protective De
Volts / Hz / Ph
AMPS 100/50/1 60
100/60/1 60
220/50/1 25
220/60/1 25
240/50/1 25
200/50/3 15
200/60/3 15
220/60/3 15
380/60/3 15
380~415/50/3 15
RPS1
RPS2
DPS1
DPS2
2FU1FU
3FU L1L3N L2
Fig. 4
Electrical Data
r 7KW Electrical Booster
14KW Electrical Booster
it ax. vice
Min. Circuit Ampacity / Max.
Protective Device
Min. Circuit Ampacity / Max.
Protective Device
AMPS AMPS
30 50
30 50
40 60 25 40
25 40
4
AM3 Dishwasher Installation & Operation Manual
CHECK ROTATION (Three-Phase Machines Only) Three phase motors must rotate in the direction of the arrow on the pump housing (counterclockwise). If the rotation is incorrect, DISCONNECT ELECTRICAL POWER SUPPLY and interchange any two of the incoming power supply leads. Re-energize the dishwasher and verify correct rotation.
Warning: The rotation of motors must be checked again before the first operation. In-correct rotation could cause improperly operation of dishwasher and damage of wash pump even in short period of time.
Power Supply for Detergent Dispenser and/or Rinse/Sanitizer Feeder (by others)
Terminals DPS1 and DPS2 in the control box allow connection of a detergent dispenser (by others). RPS1 and RPS2 terminals allow connection of a rinse/sanitizer feeder (by others) with maximum current of 3 Amps (Fig. 4). DPS1-DPS2 is powered during the wash cycle; RPS1-RPS2 is powered during the rinse cycle. Refer to the electrical diagram on the inside of side panel.
Note 1: All connecting wires must accommodate the movement of the control box as it slides out for service.
Note 2:All wires must be 600 volts insulation cable; do not use normal low voltage cable.
Cycle Timing Data
Whole Cycle(s) 60 90 120
Wash(s) 44/47 74/77 104/107
Dwell(s) 4 4 4
Rinse(s) 12/9 12/9 12/9
5
AM3 Dishwasher Installation & operation Manual
PLUMBING CONNECTIONS WARNING: PLUMBING CONNECTIONS MUST COMPLY WITH APPLICABLE SANITARY, SAFETY, AND PLUMBING CODES.
WATER SUPPLY Connect the water pipe to the incoming water supply (3/4” NPT internal threads)
With 7KW ElecWith 14KW Elec
Note: In caseinstalled (by reducer mus
DRAIN
Connect the 11/4” NPrequired by code, it sminute).
RINSE AGENT CON
Remove front panepoints. Two connprovided. One is locaand allows rinse agAnother is located upump outlet and allopipe. Select a suitarequirement. Use aconnect rinse agent (Fig. 5).
INCOMING WATER SUPPLY REQUIREMENTS TEMPERATURE PRESSURE (Dynamic) 0C 0F KPa kg/cm2
trical Booster 50~60 122~140 29.4~490 0.3~5 trical Booster 10~60 50~140 29.4~490 0.3~5
of line dynamic pressure is less than 0.3kg/cm2,a booster-pump must be others); in case of line static pressure is more than 5kg/cm2,a pressure t be installed (by others).
T drain connector under the wash tank to a suitable drain. If a grease trap is hould have a minimum flow capacity of 95.5 liters per minute (21 gallons per
NECTION
l to locate rinse agent connection ecting points for rinse agent are ted at the upper right side of booster ent to inject into the booster tank. nder the booster tank near the rinse ws rinse agent to inject into the rinse ble point according to the chemical spanner to loosen the plug and pipe with a suitable sealing material
G1/8" INTRERNALTHREADS
G1/8" INTERNALTHREADS
Fig. 5
6
AM3 Dishwasher Installation & Operation Manual
OPERATION
CONTROLS
Power Switch (below )
“Faucet” – power is on
“O” – power is off
Power Indicator (above )
Light on – machine power is on
Light off – machine power is off
Cycle Selector (below )
“I” – 60s wash cycle
“II” – 90s wash cycle
Working Indicator (above )
Light on – machine is working
Light off – wash cycle is finished
Temperature Display the left display indicates wash water temperature
the right display indicates rinse water temperature
Automatic Start closing the doors will automatically start a timed cycle or filling cycle.
Drain lift the standpipe to drain the wash tank
W
R
65
50
4045
5560
7085
70
6065
7580
90I
II O
Recommended Operating Temperatures
ash Water 60 – 65oC(140 – 149oF)
o o
inse Water 8 2 – 90 C(181 – 194 F)7
AM3 Dishwasher Installation & operation Manual
PREPARATION
Place the strainer basket in its proper location in the corner of the wash tank and insert the stand drain pipe (Fig. 6)
Close the doors.
Turn the power switch on, the machine will fill automatically.
Open the door and make sure the wash tank is full of water after fill cycle is complete. Scatter the initial amount of detergent on the strainer basket. Replenish as needed. If an automatic detergent dispenser has been installed, follow supplier’s instruction.
Strainer BasketDrain Pipe
Fig. 6
Close the door and the wash and rinse cycle will begin automatically.
Wait for the wash and rinse tank thermometer to reach the proper temperature.
DISHWASHING
Scrape the dishes to remove large particles of food and debris.
Select suitable 60 or 90 second wash cycle according to dish size and food soil.
Stack the dishes in a rack. Do not stack dishes one on top of another as water must have free access to all sides of every dish. Stand plates and dishes up edgewise in a peg-type rack. Cups, glasses and bowls should be inverted in an open-type or compartment type rack (Fig. 7). Silverware and other small pieces may be scattered loosely over the bottom of a flat bottom rack or in a basket type rack.
Fig. 7
After filling a rack, open the doors, slide the rack into the dishwasher, and close the doors. The wash and rinse cycle will begin when the doors are closed.
When the wash and rinse cycle is finished, open the doors and remove the rack of clean dishes. Continue by sliding in the next rack of dishes and close the doors.
If you want to add a dish after the wash cycle has started, before opening the doors, turn off the power switch and wait 10 seconds to allow the wash arm to stop rotation to avoid hot water splashing out on the operators.
8
AM3 Dishwasher Installation & Operation Manual
CLEANING
It is recommended that the machine be thoroughly cleaned at the end of each working shift or at least daily.
The procedures of machine cleaning as follow: 1 Turn of the power switch 2 Open the doors 3 Clean off the dish table into the dishwasher 4 Drain the machine by pulling out the drain stand pipe 5 Remove and empty the strainer basket and pump intake screen. Wash and rinse them
thoroughly. 6 Thoroughly clean and flush the dishwasher interior 7 Replace intake screen and strainer basket 8 Leave the doors open to allow the interior to dry 9 Check the wash and rinse arms rotate freely and are free of any obstructions 10 Check rinse nozzles to make sure they are free of any lime or obstruction
MAINTENANCE
WARNING: DISCONNECT ELECTRICAL POWER SUPPLY AND PLACE A TAG AT THE DISCONNECT SWITCH INDICATING THAT THE CIRCUIT IS BEING WORKED ON BEFORE BEGINNING ANY MAINTENANCE PRECEDURE.
WASHARMS
Upper and lower wash and rinse arms should turn freely and continue turning for a few seconds after being whirled by hand. To check arms, DISCONNECT ELECTRICAL POWER SUPPLY, rotate arms, and remove any obstructions causing improper operation.
Fig.8
Knurled Disk
Rinse Arm
Wash Arm
If the strainer basket or pump intake screen is not properly in place, obstructions (such as food particles or bones) may clog the wash arm nozzles. The wash arms are easily removed for cleaning.
To remove the wash and rinse arms, unscrew the knurled disk between the rinse and wash arms and take them out (Fig. 8).
NOTE: 1 It is not necessary to remove the spacer located on
the lower wash arm shaft. 2 During upper wash and rinse arms removal, be careful not to drop these arms. 3 Upper and lower wash arms and rinse arms are interchangeable.
9
AM3 Dishwasher Installation & operation Manual
TROUBLESHOOTING This section may help you avoid a service call. However, if a symptom persists after the possible causes have been checked, please contact HOBART local service departments.
SYMPTOM POSSIBLE CAUSES/SUGGESTED ACTIONS
No machine operation
1 Open doors and hold for 2 seconds, close it again 2 Blown fuse or tripped circuit breaker at power supply 3 Blown fuse FU3 at control circuit
Long wash cycle
1 Water temperature in booster is too low, fill water temperature is too low.
2 Water in booster is below high level sensor; please examine line strainer and solenoid valve.
Dishes not clean
1 Wash pump rotating in wrong direction. 2 Insufficient wash water due to drain obstruction preventing proper
drain closing. 3 Insufficient water circulation due to obstruction at pump intake screen.
Disconnect power supply, drain wash tank and check. 4 Incorrect water temperature. Insufficient warm-up time. Check circuit
breaker, thermostat and heater. 5 Incorrect detergent dispensing. Contact your detergent
representative. 6 Excessive mineral deposits through wash and rinse system. Deliming
may be necessary.
Spotting silverware, glasses, and dishes
1 Improperly loaded racks. 2 Incorrect rinse water temperature. 3 Loss of water pressure due to pump obstruction. 4 Excessively hardness of water. 5 Incorrect detergent for water type. 6 Incorrect rinse additive for water type. 7 Incorrect concentration of detergent, rinse additive and/or sanitizer.
Inadequate rinse
1 Dirty line strainer causing reduced water flow. Turn off water supply, disconnect water supply pipe and solenoid valve, withdraw and clean screen. Reassemble.
Leaking valve
1 Foreign material preventing proper valve operation. Note: a critical period is soon after installation when pipe compound or metal shavings may lodge at the valve seat. Shut off supply line. Unscrew and lift bonnet from valve body. Clean valve and reassemble
2 If a solenoid valve is malfunctioning, it is recommended that you contact Service
No or slow fill
1 Dirty line strainer causing reduced water flow. Turn off water supply, disconnect water supply pipe and solenoid valve, withdraw and clean screen. Reassemble
2 Low supply line pressure
10
AM3 Dishwasher Installation & Operation Manual
11
SERVICE Contact your local Hobart-authorized service office for any repairs or adjustments needed on this equipment.
INC
OM
ING
WA
TE
R:C
on
ne
ctw
ate
rlin
eto
the
su
pp
lied
wa
ter
ho
se
on
the
ba
ck
ofth
em
ach
ine
.
2.1
Th
eH
ob
art
su
pp
lied
inco
min
gw
ate
rh
ose
is1
.5m
lon
g,G
3/4
"
inte
rna
lth
rea
ds.
2.2
Flo
win
gw
ate
rp
ressu
reshoukd
be
0.3
-5.0
kg/c
m2.
2.3
Inco
min
gw
ate
rte
mp
era
ture
sh
ou
db
e1
0-6
0C
.
No
te:W
ate
rp
ressu
reo
uts
ide
the
ab
ove
ran
ge
will
resu
ltin
ine
ffe
ctive
rin
se
resu
lts.
PO
WE
R:M
ake
ele
ctr
ica
lco
nn
ectio
nto
the
ma
ch
ine
with
the
Ho
ba
rtsu
pp
lied
co
rdlo
ca
ted
atth
eba
ck
ofth
em
ach
ine
.
3.1
Co
nfirm
tha
tm
ach
ine
ele
ctr
ica
lsp
ecific
atio
na
rerig
htfo
rth
e
insta
llatio
nlo
ca
tio
n.
3.2
Ye
llow
/gre
en
wir
es
are
Gro
un
d,th
eb
lue
wir
ein
Na
nd
the
oth
er
wire
sa
reL
.
No
te:
Ele
ctr
ica
la
nd
gro
un
dco
nn
ectio
ns
mu
st
co
mp
lyw
ith
all
na
tio
na
la
nd
loca
lco
de
s.
CH
EC
KR
OT
AT
ION
OF
WA
SH
PU
MP
:
4.1
Ve
rify
co
un
terc
lockw
ise
rota
tio
no
fp
um
pa
fte
re
lectr
ica
l
co
nn
ectio
nis
co
mp
lete
d.
4.2
Ifro
tatio
nis
inco
rre
ctd
isco
nn
ectp
ow
er
su
pp
lya
nd
inte
rch
an
ge
an
ytw
ole
ad
s.
4.3
Re-e
nerg
ize
the
machin
ea
nd
verify
counte
rclo
ckw
ise
pum
p
rota
tio
n.
RIN
SE
AG
EN
TD
ISP
EN
SE
RC
ON
NE
CT
ION
:(u
su
ally
co
nn
ecte
db
ych
em
ica
lco
mp
an
y)
5.1
Co
nn
ectto
eith
er
po
int(1
)o
rp
oin
t(2
).
5.2
Co
nn
ectio
ns
po
ints
are
G1
/8"
inte
rna
lth
rea
ds.
CO
NN
EC
TR
INS
EA
GE
NT
AN
DD
ET
ER
GE
NG
PO
WE
RS
UP
PL
Y:
(usu
ally
co
nn
ecte
db
ych
em
ica
l
com
pany)
6.1
Slid
eo
utco
ntr
olb
ox
an
dre
mo
ve
co
ve
r.
6.2
Co
nn
ectd
ete
rge
ntd
isp
en
ser
wires
tote
rmin
als
DS
P1
and
DS
P2
.T
he
se
term
ina
lsa
rep
ow
ere
dd
urin
gth
ew
ash
cycle
an
dsu
pp
lya
ma
xim
um
cu
rre
nto
f3
am
ps.
6.3
Co
nn
ectrin
se
ag
en
td
isp
en
se
sw
ire
sto
term
ina
lsR
PS
1
an
dR
PS
2.T
he
se
term
ina
lsa
rep
ow
ere
dd
uri
ng
the
rin
se
cycle
an
dsu
pp
lya
ma
xim
um
cu
rre
nto
f3
am
ps.
No
te:
De
terg
en
ta
nd
rin
se
ag
en
td
isp
en
se
rsca
no
nly
be
co
nn
ecte
dto
the
term
ina
lslis
ted
ab
ove
.
DR
AIN
:C
on
ne
ctd
rain
toth
eG
1-1
/4"
exte
rna
l
thre
ad
dra
ino
pe
nin
go
nth
eb
ott
om
of
the
ma
ch
ine
.
TH
ISC
AR
DIS
AB
RIE
FS
TE
P-B
YS
TE
PG
UID
EF
OR
INS
TA
LL
ING
HO
BA
RT
MO
DE
LA
M3
.
FO
RM
OR
EIN
FO
RM
AT
ION
PL
EA
SE
RE
FE
RT
OT
HE
AM
3O
PE
RA
TO
RM
AN
UA
LIN
CL
UD
ED
WIT
HY
OU
RM
AC
HIN
EO
R
CO
NT
AC
TY
OU
RLO
CA
LH
OB
AR
TS
ER
VIC
EO
FF
ICE
,D
EA
LE
RO
RS
ER
VIC
EA
GE
NT
.
1
2 3 4
5 6
AM
3D
ish
wa
sh
er
Ins
tall
ati
on
Gu
ide
7
DIS
HT
AB
LE
S:
Dis
hta
ble
ed
ge
sh
ou
ldtu
rnd
ow
n
into
the
dis
hw
ash
er.
Dis
hta
ble
dim
en
sio
ns
are
de
taile
do
nth
ep
rod
uctb
roch
ure
an
din
the
op
era
tor
ma
nu
al.
Use
asu
ita
ble
se
ale
rb
etw
ee
n
tab
les
an
dta
nk
top
reve
ntle
aka
ge
.
F-74
3441
E
AM
3 C
ON
TRO
L B
OA
RD
CH
AR
T
Desc
riptio
n Ind
icatio
n Po
wer
Light
mean
s elec
tricity
turn
ed on
60
sec.
Light
mean
s 60 s
ec. w
orkin
g cyc
le se
lected
90
sec.
Light
mean
s 90 s
ec. w
orkin
g cyc
le se
lected
12
0 sec
. Lig
ht me
ans 1
20 se
c. wo
rking
cycle
selec
ted
Door
switc
h Lig
ht me
ans d
oor c
losed
Ta
nk lo
w lev
el Lig
ht me
ans w
ater in
tank
abov
e low
leve
l sen
sor
Tank
high
leve
l Lig
ht me
ans w
ater in
tank
abov
e high
leve
l sen
sor
Boos
ter te
mper
ature
Lig
ht me
ans w
ater t
empe
ratur
e in b
ooste
r too
low
Boos
ter lo
w lev
el Lig
ht me
ans w
ater in
boos
ter ab
ove l
ow le
vel s
enso
r Bo
oster
high
leve
l Lig
ht me
ans w
ater in
boos
ter ab
ove h
igh le
vel s
enso
r W
ash p
ump
Light
mean
s was
h pum
p run
ning
Rins
e Pum
p Lig
ht me
ans r
inse p
ump r
unnin
g Fil
l Lig
ht me
ans f
ill va
lve op
en
Tank
heate
r Lig
ht me
ans w
ater le
vel a
bove
low
water
sens
or
Boos
ter he
ater
Light
mean
s wate
r leve
l abo
ve lo
w wa
ter se
nsor
Ind
icator
Lig
ht me
ans w
ash i
n pro
gres
s
OSw
itch
1 O O
Switc
h 2
O
60' LN
100~
220V
DC
5V
- ++-0'
60'
Rin
sepu
mp
J503
Was
hpu
mp
J502
J504Fill
J505
Tank
heat
er
J506
Boo
ster
heat
er
J501
Indi
cato
r
Boo
ster
tem
pera
ture
120'
90'
Pow
er
90'
120'
off
on
21
J107
Boo
ster
hi
gh le
vel
J106
Boo
ster
low
leve
l
J102
low
leve
lhi
gh le
vel
J103
Tank
J105
Tank
J101
Doo
r sw
ith
Pin
switc
h
Stat
e of
indi
cato
rs
Fill c
ycle
Was
h cyc
le Dw
ell cy
cle
Rins
e cyc
le Re
set
ON
ON
ON
ON
ON
Only
and m
ust o
ne of
the t
hree
indic
ator is
ON
ON
ON
ON
ON
ON/O
FF
OFF
ON
ONON
ONON
/OFF
OFF
ON
ON/O
FFON
/OFF
ON/O
FFON
/OFF
ON
ON/O
FF
OFF
OFF
ON/O
FF
ONOF
F
ON
ONON
ONON
OFF
OFF
ONON
ONOF
FON
OFF
ON
OFF
OFF
OFF
ONOF
F
OF
FOF
FON
OFF
ON
ONOF
F
OFF
OFF
OFF
OFF
ON
ONON
ONON
/OFF
ONOF
F
ON
ONON
ONFla
sh
ON
ON
ON
OFF
NO
TE:
This
cha
rt is
for
the
use
of
HO
BA
RT
serv
ice
tech
nici
ans
and
serv
ice
agen
ts.
Con
tact
yo
ur
loca
l H
OB
AR
T-au
thor
ized
serv
ice
offic
e fo
r an
y re
pairs
or
adju
stm
ents
need
ed o
n th
is e
quip
men
t.
Pin
switc
h fu
nctio
ns
N
12
sec
. rin
se ti
me
FF
9 se
c. ri
nse
time
N
Ther
mo-
stop
feat
ure
is O
N
FF
Ther
mo-
stop
feat
ure
is O
FF