Alto-Shaam HSM-24/5S User manual

alto-shaam.com
Service Manual
Heated Shelf
Merchandiser
HSM-24/5S
HSM-36/5S
HSM-48/5S
HSM-24/3S-CT
HSM-36/3S-CT
MN-39054
REV.01
4/17
EN

Manufacturer’s Information
Copyright © Copyright 4/17 by Alto-Shaam, Inc.
All rights reserved.
This manual or any portion thereof may not be reproduced or used in any
manner whatsoever without the express written permission of Alto-Shaam, Inc.
Trademarks All trademarks referenced in this documentation are the property of their
respective owners.
Manufacturer Alto-Shaam, Inc.
P.O. Box 450
W164 N9221 Water Street
Menomonee Falls, WI 53052
Original instructions The content in this manual is written in American English.
User profile The servicer of this appliance must be a qualified and trained Alto-Shaam service
partner.

FORWARD
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
3
ORWARD
Alto-Shaam 24/7 Emergency Repair Service
Call Call 800-558-8744 to reach our twenty-four hour emergency service call center
for immediate access to local authorized service agencies outside standard
business hours. The emergency service access is provided exclusively for
Alto-Shaam equipment and is available throughout the United States through
Alto-Shaam’s toll free number.
Availability Emergency service access is available seven days a week, including holidays.

FORWARD
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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TABLE OF CONTENTS
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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T
ABLE
OF
C
ONTENTS
Manufacturer’s Information . . . . . . . . . . . . . . . . . . . . . . . . 2
Forward 3
Alto-Shaam 24/7 Emergency Repair Service . . . . . . . . . . . . . . . 3
Table of Contents 5
Safety 7
The Meaning of Signal Words . . . . . . . . . . . . . . . . . . . . . . . 7
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Operation 11
Operating the Merchandiser. . . . . . . . . . . . . . . . . . . . . . . . 11
Components 12
Component Identification . . . . . . . . . . . . . . . . . . . . . . . . . 12
HSM-CT Component Access Panels . . . . . . . . . . . . . . . . . . . . 14
HSM-5S Component Access Panels . . . . . . . . . . . . . . . . . . . . 15
HSM—Electrical Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 16
HSM Electrical Assembly Cont.. . . . . . . . . . . . . . . . . . . . . . . 17
Temperature Controller . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Heating Pads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Theory 20
HSM-24/5S (208-240V, 230V) . . . . . . . . . . . . . . . . . . . . . . . . 20
HSM-36/5S (208-240V, 230V) . . . . . . . . . . . . . . . . . . . . . . . . 22
HSM-48/5S (208-240V, 230V) . . . . . . . . . . . . . . . . . . . . . . . . 24
HSM-24/3S-CT (120V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
HSM-24/3S-CT (208-240V, 230V) . . . . . . . . . . . . . . . . . . . . . . 28
HSM-36/3S-CT (208-240V, 230V) . . . . . . . . . . . . . . . . . . . . . . 30
Schematics 32
HSM-24/5S (208-240V, 230V) . . . . . . . . . . . . . . . . . . . . . . . . 32
HSM-36/5S, HSM-48/5S (208-240V, 230V). . . . . . . . . . . . . . . . . 33
HSM-24/3S-CT (120V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
HSM-24/3S-CT (208-240V, 230V) . . . . . . . . . . . . . . . . . . . . . . 35
HSM-36/3S-CT (208-240V, 230V) . . . . . . . . . . . . . . . . . . . . . . 36
Troubleshooting 37
No Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
One Shelf Not Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
All Lights, or one Bank of Lights, will not Illuminate . . . . . . . . . . 39
Fans Will Not Turn On. . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Assembly/Disassembly 41
Replacing the Shelf Heating Element . . . . . . . . . . . . . . . . . . . 41

TABLE OF CONTENTS
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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SAFETY
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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AFETY
The Meaning of Signal Words
Technical content produced by Alto-Shaam contains signal words where needed.
These signal words must be obeyed to reduce the risk of death, personal injury,
or equipment damage. The meaning of these signal words is explained below.
DANGER
Danger indicates a hazardous situation which, if not avoided, will
result in serious injury or death.
WARNING
Warning indicates a hazardous situation which, if not avoided,
could result in serious injury or death.
CAUTION
Caution indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
NOTICE
Notice indicates a situation which, if not avoided, could result
in property damage.
Note indicates additional information that is important to a concept
or procedure.

SAFETY
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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Safety Precautions
Before you begin Read and understand all instructions in this manual.
▪The merchandiser is intended to hold pre-packaged food for human
consumption. No other use for this merchandiser is authorized by the
manufacturer or its agents and is therefore considered dangerous.
▪The merchandiser is intended for use in commercial establishments where all
operators are familiar with the purpose, limitations, and associated hazards of
this merchandiser. Operating instructions and warnings must be read and
understood by all operators and users. Alto-Shaam recommends regular staff
training to avoid the risk of accident or damage to the merchandiser. Operators
must also receive regular safety instructions.
Usage precautions Follow these precautions when using the appliance:
▪To prevent serious injury, death or property damage, the merchandiser should
be inspected and serviced at least every twelve (12) months by an authorized
service partner or trained technician.
▪Only allow an authorized service partner or trained technician to service or to
repair the merchandiser. Installation or repairs that are not performed by an
authorized service partner or trained technician, or the use of non-factory
authorized parts will void the warranty and relieve Alto-Shaam of all liability.
▪When working on this merchandiser, observe precautions in the manual, on tags,
on labels attached to or shipped with the merchandiser, and other safety
precautions that may apply.
▪If the merchandiser is installed on casters, freedom of movement of the
merchandiser must be restricted so that utility connections (electricity) cannot be
damaged when the merchandiser is moved before moving. If the merchandiser
is moved, make sure all utility connections are disconnected. When returning the
merchandiser to its original position, make sure that retention devices and utility
connections are connected.
▪Only use the merchandiser when it is stationary. Unload the merchandiser
before moving it. Merchandises on casters can tip over when being moved over
an uneven floor or threshold and cause serious injury. Always apply caster brakes
on the mobile merchandiser when it is not being moved.

SAFETY
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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Electrical usage An identification tag is permanently mounted on the cabinet. Permanent wiring
or electrical outlets for this merchandiser must be installed by a licensed
electrician in accordance with local, country, or national codes.
This merchandiser must be connected to a dedicated circuit: (see below)
▪HSM-48: 30 Amp circuit
▪HSM-36: 20 Amp circuit
▪HSM-24: 20 Amp circuit
Cord and plug models ▪In the event of an emergency, always position the merchandiser so the power
supply cord is easily accessible.
▪Plug the unit into a properly grounded receptacle only. Arcing will occur when
connecting or disconnecting the unit unless all controls are in the OFF position.
Hard wired model: Hard wired models must be equipped with a country certified external allpole
disconnection switch with sufficient contact separation.
If a power cord is used for the connection of the product, an oil resistant cord like
H05RN or H07RN equivalent must be used.
NOTICE
Where local codes and CE regulatory requirements apply,
appliances must be connected to an electrical circuit that is
protected by an external GFCI outlet.
CAUTION
Power source must match the voltage identified on appliance
rating tag. The rating tag provides essential technical
information required for an appliance installation, maintenance
or repairs. Do not remove, damage or modify the rating tag.
WARNING
To prevent serious injury, death, or property damage:
All electrical connections must be made by qualified and trained
service technician in accordance with applicable electrical codes.
This appliance must be adequately grounded in accordance with
local electrical codes or, in the absence of local codes, with the
current edition of the National Electrical Code ANSI/NFPA No. 70.
In Canada, all electrical connections are to be made in
accordance with CSA C22.1, Canadian Electrical Code Part 1 or
local codes.
CE-approved appliances include an equipotential-bonding
terminal marked with the symbol shown on the left. Provisions
for earthing are to be made in accordance with IEC:2010 60335-1
section 27 or local codes.

SAFETY
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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Electrical
specifications
WARNING
Electric shock hazard:
This appliance may be equipped with a three-pronged
(grounding) plug for your protection against shock hazard and
should be plugged directly into a properly grounded three-
prong receptacle.
Do not cut or remove the grounding prong from this plug.
Removing the grounding prong may result in serious injury,
death or property damage.
Electrical
VPhHzAkW
HSM-48/5S
HSM-36/5S
HSM-24/5S
HSM-36/3S-CT
HSM-24/3S-CT
160208–240 19.0–21.9 4.0–5.3
230 1 50/60 20.0 4.6
1208–240 60 14.4–16.7 3.0– 4.0
230 1 50/60 15.0 3.5
1208–240 60 10.8–12.5 2.3– 3.0
230 1 50/60 11.5 2.9
160208–240 8.8–9.2 1.9–2.5
230 1 50/60 9.0 2.1
120 1 60 15.0 1.8
1208–240 60 6.5–7.5 1.4–1.8
230 1 50/60 7.0 1.8
Dedicated
Circuit Breaker
30
30
20
20
20
20
20
20
20
20
20
Plug Configuration
cord, no plug
cord, no plug
cord, no plug
CEE 7/7
NEMA
20A - 250V
CEE 7/7
NEMA
20A - 250V
5-20P
20A - 125V
6-20P
20A - 250V
6-20P
6-20P
NEMA
NEMA
HDC-PHD-000525

OPERATION
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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PERATION
Operating the Merchandiser
Control Panel
Door Handle
Control Panel
Door Latch
1. Make sure the merchandiser is connected to the
appropriate power source.
2. Locate the power switch below the top canopy of the left
side of the merchandiser.
3. Press the power switch to the ON (l) position.
4. Turn the control panel door latch.
5. Pull the door open.
5. Turn the temperature contol knob(s) to the desired
Power Switch
Indicator
light
Temperature
control knob
HDC-TS-000533
number-- 1 is low temperature, 10 is high temperature.

COMPONENTS
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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COMPONENTS
Component Identification
HDC-PHD-000538
HSM-48/5S HSM-24/5S
HSM-36/3S-CT HSM-24/3S-CT

COMPONENTS
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(RTD) Temperature sensor, 1000 ohm
LED lights, non-polarized terminals
LED light bar, Polarity specific wiring
Positive wire (+) denoted by the white stripe.
3-inch box fan, impedance protected
Airflow direction specific.
HDC-PHD-000579

COMPONENTS
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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HSM-CT Component Access Panels
Rear Service Panel
Control Panel
ON/OFF Switch
RTD
Temperature
Sensor HDC-PHD-000542

COMPONENTS
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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HSM-5S Component Access Panels
ON/OFF Switch
Control Panel
Top Service Panel
Rear Service Panel
HDC-PHD-000546
RTD
Temperature
Sensor

COMPONENTS
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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HSM—Electrical Assembly
Terminal
Blocks
ABCDE
HDC-PHD-000567
HSM-24/5S, HSM-36/5S, HSM-48/5S
C D E
L2/NFans
Fan
Fuse
Heating Pad
White Wire
HSM 24
208-240V
230V
Heating Pads L1 GND DC
DC
Fuses DC+ DC+ DC-
Lights

COMPONENTS
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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HSM Electrical Assembly Cont.
HSM-24/3S-CT Electrical Assembly
Terminal
Blocks
Terminal
Blocks
HSM-36/3S-CT Electrical Assembly
HDC-PHD-000550
MAIN
TERMINAL BLOCK
MAIN
TERMINAL
BLOCK
TB1
TB2
TB3 TB4
TB7 TB8 TB9 TB13TB12TB11
TB10 FB
1
FB
2
TB1
TB2
TB3
TB4
TB7 TB8 TB9 TB13TB12TB11
TB10 FB
1
FB
2
A B C
A B C

COMPONENTS
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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Temperature Controller
HDC-PHD-000571
GND
Indicator
light
Temperature
control knob

COMPONENTS
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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Heating Pads
WH
EL-36461 120 & 240 Volt, 550 Watts HSM-24
Blk
Blk
Blk
EL-37091 240 Volt, 750 Watts HSM-36
Blk
Blk
EL-37134 240 Volt, 1000 Watts HSM-48
Blk
HDC-PHD-000577
BLK
BLK
BLKBLK
BLK
BLK
Wire
WH to either BLK
BLK to BLK
Ohm
52
105
Wire
BLK to BLK
Ohm
77
Wire
BLK to BLK
Ohm
58

THEORY
Heated Shelf Merchandiser ?Service Manual ?MN-39054 ?Rev 1 ?4/17
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HEORY
HSM-24/5S (208-240V, 230V)
Electrical power is supplied into the unit to the main terminal block, the
contactor and the ON/OFF switch. When the ON/OFF switch is selected to the ON
position, line voltage is supplied to the A1 and A2 terminals of the contactor. The
contactor activates and supplies power to L1 and L2/N terminal blocks, the fans,
and the 12 VDC power supply.
12 VDC is supplied to fuses FB1 and FB2 from the power supply. The DC+ and DC-
terminal blocks are the connection points for the lights.
Line voltage is supplied to the L1, L2/N, and COM terminals of the temperature
controller from the L1 and L2/N terminal blocks. The RTD temperature sensor
provides a resistance signal into the temperature controller corresponding to
surface temperature of the shelf it is mounted to. The temperature controller
monitors the requested temperature from the temperature control knob setting
and the shelf temperature from the RTD temperature sensor. When a call for
heat is made, the temperature controller closes the NO contacts of the relay. L1
voltage is supplied to the terminal block and then to one of the black wires of the
heating pad. The other black wire from the heating pad is connected to the L2/N
terminal block. The white wire from the heating pad is connected to the terminal
block with no other connection. The two coils in the heating pad are connected in
series. The indicator light illuminates signaling the call for heat from the
temperature controller.
When the shelf has reached the requested temperature, the temperature
controller opens the NO contacts of the relay. L1 voltage is no longer supplied to
the heating pad. The indicator light goes out.