PS870 Series
Gas
Domestic
ENGLISH
P/N59157
August 4, 2006
PS870 Series Gas Ovens
Model:
• PS870G Gas
Combinations:
• SingleOven
• DoubleOven(Two-Stack)
• TripleOven(Three-Stack)
OWNER'S OPERATING AND
INSTALLATION MANUAL
for domestic and standard export ovens
©2006 Middleby Marshall Inc.
is a registered trademark of Middleby Marshall, Inc. All rights reserved.
Middleby Cooking Systems Group • 1400 Toastmaster Drive • Elgin, IL 60120 • (847)741-3300 • FAX (847)741-4406
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Model No.
Modéle No.
Serial No.
Serié No.
Installation Date
Date d'installation
MIDDLEBY MARSHALL
NO QUIBBLE LIMITED WARRANTY
(U.S.A. ONLY)
MIDDLEBY MARSHALL INC.
OVEN LIMITED WARRANTY
(Non U.S.A.)
The Seller warrants equipment manufactured by it to be free from
defects in material and workmanship for which it is responsible. The
Seller’s obligation under this warranty shall be limited to replacing
or repairing, at Seller’s option, without charge, F.O.B. Seller’s
factory, any part found to be defective and any labor and material
expense incurred by Seller in repairing or replacing such part. Such
warranty is limited to a period of one year from date of original
installationor15monthsfromdateofshipmentfromSeller’sfactory,
whichever is earlier, provided that terms of payment have been fully
met. All labor shall be performed during regular working hours.
Overtime premium will be charged to the Buyer.
MIDDLEBY MARSHALL, HEREINAFTER REFERREDTO AS
“THE SELLER”,WARRANTS EQUIPMENT MANUFACTURED
BY IT TO BE FREE FROM DEFECTS IN MATERIAL AND
WORKMANSHIP FOR WHICH IT IS RESPONSIBLE. THE
SELLER’S OBLIGATION UNDERTHISWARRANTY SHALL
BE LIMITEDTO REPLACING OR REPAIRING, AT SELLER’S
OPTION, WITHOUT CHARGE, ANY PART FOUND TO BE
DEFECTIVE AND ANY LABOR AND MATERIAL EXPENSE
INCURRED BY SELLER IN REPAIRING OR REPLACING
SUCH PART. SUCH WARRANTY SHALL BE LIMITED TO
THE ORIGINAL PURCHASER ONLY AND SHALL BE EFFEC-
TIVE FOR A PERIOD OF ONEYEAR FROM DATE OF ORIGI-
NAL INSTALLATION, OR 18 MONTHS FROM DATE OF PUR-
CHASE,WHICHEVER IS EARLIER, PROVIDEDTHATTERMS
OF PAYMENT HAVE BEEN FULLY MET.
This warranty is not valid unless equipment is installed,
started, and demonstrated under the supervision of a fac-
tory-authorized installer.
Normal maintenance functions, including lubrication, adjustment of
airflow, thermostats, door mechanisms, microswitches, burners
and pilot burners, and replacement of light bulbs, fuses and
indicating lights, are not covered by warranty.
This warranty is valid only if the equipment is installed, started,
and demonstrated under the supervision of a factory-autho-
rized installer.
Any repairs or replacements of defective parts shall be performed
by Seller’s authorized service personnel. Seller shall not be
responsible for any costs incurred if the work is performed by other
than Seller’s authorized service personnel.
Normal maintenance functions, including lubrication, cleaning,
or customer abuse, are not covered by this no quibble war-
ranty.
When returning any part under warranty, the part must be intact and
complete, without evidence of misuse or abuse, freight prepaid.
Seller shall be responsible only for repairs or replacements of
defective parts performed by Seller’s authorized service per-
sonnel. Authorized service agencies are located in principal
cities throughout the contiguous United States, Alaska, and
Hawaii. This warranty is valid in the 50 United States and is void
elsewhere unless the product is purchased through Middleby
International with warranty included.
Seller shall not be liable for consequential damages of any kind
which occur during the course of installation of equipment, or which
result from the use or misuse by Buyer, its employees or others of
the equipment supplied hereunder, and Buyer’s sole and exclusive
remedy against Seller for any breach of the foregoing warranty or
otherwise shall be for the repair or replacement of the equipment
or parts thereof affected by such breach.
The foregoing warranty is exclusive and in lieu of all other
warranties, expressed or implied. There are no implied
warranties of merchantability or of fitness for a particular
purpose.
The foregoing warranty shall be valid and binding upon Seller if and
only if Buyer loads, operates and maintains the equipment supplied
hereunder in accordance with the instruction manual provided to
Buyer. Seller does not guarantee the process of manufacture by
Buyer or the quality of product to be produced by the equipment
supplied hereunder and Seller shall not be liable for any prospective
or lost profits of Buyer.
The foregoing shall be Seller’s sole and exclusive obligation
and Buyer’s sole and exclusive remedy for any action, includ-
ing breach of contract or negligence. In no event shall Seller be
liable for a sum in excess of the purchase price of the item.
Seller shall not be liable for any prospective or lost profits of
Buyer.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF
ALL OTHER EXPRESS AND IMPLIED WARRANTIES WHATSO-
EVER. SPECIFICALLY THERE ARE NO IMPLIED WARRANTIES
OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR
PURPOSE.
This warranty is effective on Middleby Marshall equip-
ment sold on, or after, February 15, 1995.
The foregoing shall be Seller’s sole and exclusive obligation and
Buyer’s sole and exclusive remedy for any action, whether in
breach of contract or negligence. In no event shall seller be liable
for a sum in excess of the purchase price of the item.
© 2003 - Middleby Marshall, A Middleby Company.
The Middleby Marshall logo is a registered trademark of Middleby Marshall, A Middleby Company.
Middleby Marshall Inc. • 1400Toastmaster Drive • Elgin, Illinois 60120-9272 U.S.A.• (847) 741-3300 • FAX:(847) 741 4406
3
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Table of Contents
Page
Page
SECTION 1
IV. ASSEMBLY ...................................................................... 9
A. Base Pad, Legs, Casters, and Stacking .................. 9
B. Restraint Cable Installation ...................................... 9
C. Conveyor Installation ................................................ 9
D. Standoff Installation ................................................ 10
V. FINAL ASSEMBLY ....................................................... 11
VI. ELECTRICAL SUPPLY ............................................... 11
Connection .................................................................. 12
VII. GAS SUPPLY ............................................................. 12
A. Gas Utility Rough-In Recommendations ............... 12
B. Connection ............................................................... 13
C. Gas Conversion ....................................................... 13
D. Propane Conversion ............................................... 13
DESCRIPTION .................................................................... 5
I. OVEN USES .................................................................... 5
II. OVEN COMPONENTS .................................................... 5
A. Conveyor Motor Drive .............................................. 5
B. Crumb Pans ............................................................... 5
C. Conveyor End Stop and Rear Stop .......................... 5
D. Conveyor End Stop and Rear Stop .......................... 5
E. Conveyor .................................................................... 5
F. End Plugs .................................................................... 5
G. Eyebrows ................................................................... 5
H.Window ....................................................................... 5
I. Machinery Compartment Access Panel ................... 5
J. Serial Plate ................................................................. 5
K. Control Panel ............................................................. 5
L. Gas Burner ................................................................. 5
M. Blowers ...................................................................... 5
N. Air Fingers ................................................................. 5
SECTION 3
OPERATION ........................................................................ 14
I. LOCATION AND DESCRIPTION OF CONTROLS ....... 14
II. NORMAL OPERATION, STEP-BY-STEP ..................... 15
A. Main Screen ............................................................. 15
A. Daily Startup Procedure ......................................... 16
B. Daily Shutdown Procedure ..................................... 16
III. QUICK REFERENCE: TROUBLESHOOTING ......... 17
IV. SCREEN ALERTS ................................................... 17
III. OVENSPECIFICATIONS ................................................. 5
A. Dimensions ................................................................ 5
B. General Specifications............................................. 5
C. Electrical Specifications for PS870 Gas Ovens ..... 6
D. Gas Orifice and Pressure Specifications
for PS870 Gas Ovens .............................................. 6
SECTION 4
MAINTENANCE .................................................................. 18
I. MAINTENANCE - DAILY .............................................. 18
II. MAINTENANCE - MONTHLY ....................................... 19
III. MAINTENANCE - EVERY 3 MONTHS ........................ 20
IV. MAINTENANCE - EVERY 6 MONTHS ....................... 21
V. KEY SPARE PARTS KIT ............................................. 22
SECTION 2
INSTALLATION .................................................................. 6
I. BASE PAD KIT ............................................................... 7
II. INSTALLATIONKIT ........................................................ 8
III.VENTILATIONSYSTEM ................................................. 8
A. Requirements ............................................................ 8
B. Recommendations .................................................... 8
C. Other Ventilation Concerns ...................................... 8
SECTION 5
ELECTRICAL WIRING DIAGRAM ...................................... 23
I. WIRING DIAGRAM, 870 GAS OVEN, 208/240V,
50/60 Hz, 1 Ph ............................................................... 23
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ITEM QTY
P/N
DESCRIPTION
1
2
3
1
1
1
55028
55027
59026
STOP,BACKSIDECONVEXT
STOP,SIDEENDCONVEXT
OWNER'SOPERATING&
INSTALLATION MANUAL
4
5
1
1
1
1
1
1
1
2
2
42612
33120-0056
22450-0130
59155
KIT,SUPPLEMENTSVCAGENCYLIST
PIPE,BLK 1-1/4" X 54"
6
BAG,POLY4MIL9"X12"W/MINI-GRIP
BUSHING,HEYCOSB1500-18
Reflector
7
8
59099
9
59098
Bracket, Reflector
10
11
12
59226
WLDMT, Bracket Reflector
Spacer, 1.5" Dia X 1.125" H
SCR, MS HH 10-32 X 1-1/4 18-8
48522
19A15144
8
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9
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D. STANDOFF INSTALLATION
1 Place screw, P/N 19A15144, through counter-bored hole in
standoff, P/N 48522, and screw into weld nut on rear shroud.
2. Repeat procedure for both sides.
10
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Mount the new reflector bracket to the provided holes on the
front right-hand side of the oven. The reflector should be
positioned just above the conveyor belt.
Using an assistant, hold both back cover switches in the
closed position. This will allow power to the photo-eye, and it
will provide a red beam for aiming. Loosen one of the screws
holding the photo detector gimbal tight, allowing it to be
reaimed at the reflector. The beam should hit exactly in the
center of the reflector, then tighten the screw back down.
Note: This is MUCH easier in reduced light.
Replace all covers.
CONVEYOR BELT REVERSAL
Conveyor belt reversal consists of four steps:
1. Physically reversing the conveyor belt.
2. Moving the lower thermocouple.
3. Resetting direction jumper on the conveyor control board.
4. Switching the photo detector.
REVERSING THE CONVEYOR BELT
Remove the conveyor from the oven and find the master link
location. Remove master links and remove the belt from the
conveyor frame. Reassemble the belt back onto the frame (in
the reverse direction) and reinstall the master links. Replace
the conveyor assembly in the oven.
MOVING THE LOWER THERMOCOUPLE
The lower thermocouple needs to be moved from the lower
outer most hole to the opposite side lower outer most hole.
The thermocouple electrical connection needs to be moved
as well. Insert the thermocouple (TC2) into the thermocouple
hole left open by the removal of the coverplate. Secure the
thermocouple (TC2 and rename TC3) with the two (2) 6-32
screws that were removed previously. Secure the coverplate
with the two (2) 6-32 screws over the hole where the thermo-
couple (TC2) was removed.
RESETTING DIRECTION JUMPER
LocateJumperP1ontheconveyorcontrolboard. Movejumper
from terminals 1 and 2, and replace onto terminals 2 and 3.
Incoming electrical power lines are fed through the strain-
relief fitting, shown in Figure 2-12. The electrical supply
connections are made inside the electrical junction box. The
power lines then connect to the oven circuits through safety
switches located inside the machinery compartment and
each blower motor compartment. These switches interrupt
electrical power to the oven when the Machinery Compart-
ment Access Panel is opened, OR when either of the blower
or rear shrouds is removed.
SWITCHING PHOTO DETECTOR
Removebothrearfanbeltcovers, thenremovethemotorcover
assembly from both sides of the oven. The photo eye is located
on the front side of the left motor bracket. Disconnect the three
connecting wires, noting which color wires assemble to the
associated wires on the photo-detector. Remove the entire
photo detector bracket. Replace the assembly to the right-
hand side of the unit, mirroring the way it was assembled on
the left. Reconnect the detector wiring in the same order it was
on the left.
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Connection
Refer to the wiring diagram inside the machinery compart-
ment of the oven to determine the correct connections for the
electrical supply lines. Connect the supply as indicated on the
wiring diagram.
CAUTION
The terms of the oven's warranty require all start-ups, conver-
sions and service work to be performed by a Middleby Marshall
Authorized Service Agent.
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D. PS870 Propane conversion
Four items have to be changed, to change the oven to LP:
1. Adjust internal burner air shutters.
2. Replace main Orifices
3. Replace (and adjust) the spring in the main valve (see LP kit)
4. Adjust modulating valve bypass settings.
Disconnect the manifold unions closest to the main burner,
and remove the manifold assemblies (four screws each).
Remove the addition four screws holding the burner cores and
slide out each burner core (leaving the ignition and sense
wires connected). Adjust the internal air shutters fully open,
and replace the cores.
Replace the main orifices on the manifold assemblies with the
LP units, and replace the manifold assemblies. Reconnect the
unions. Replace the valve spring with the LP spring, and adjust
the downstream pressure to get 7″ WC.
Adjust the bypass screws in the side of each modulating valve
toapproximately1/6turnfromfullyclosed.Ifthissettingistoolow,
the burners will shut off when trying to modulate. If it is too open,
the unit will tend to gradually raise up in temperature at standby.
Certain safety code requirements exist for the installation of
gas ovens; refer to the beginning of Section 2 for a list of the
installation standards. In addition, because a the oven is
equipped with casters, the gas line connection shall be made
with a connector that complies with the Standard for Connec-
tors for Movable Gas Appliances, ANSI Z21.69 (in U.S.A.), as
well as a quick-disconnect device that complies with the
Standard for Quick-Disconnect Devices for Use With Gas Fuel,
ANSI Z21.41 (in U.S.A.).
Figure 2-14 - Gas Burner/Blower Motor and Piping Assembly
Burner/BlowerMotor
GasBurner
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SECTION3-OPERATION
C. Temperature Control Display
E. Message Bar
Increase
Decrease
A. Main On/Off Button
B. Conveyor Time Setting
D.TEMPSet
Right
Left
LOCATION AND DESCRIPTION OF CONTROLS
C. Temperature Control/Display
A. Main On/Off Button
Displays the set point of both right and left sides of the
oven.
Turnsallovenfunctionsonoroff.Iftheovenisbelowtheset
point, it will rise to the set point and turn the conveyor on.
Ifitisturnedoffandtheovenisabove200°F, theblowers
will remain on until the oven drops below 200° F.
D. TEMP Set
Pressingonthe“TEMP”buttonshowsindividualdisplays
andcombinedadjustments.
B. Conveyor Time Setting
Adjusts and displays the conveyor bake time. Dual belt
ovens have two displays, single units have one.
E. Message Bar
Indicatesvariousmessagespertainingtocurrentoven
conditions.
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NORMAL OPERATION - STEP-BY-STEP-
2. Push the “ON/OFF” button to start the oven. The
A. Main Screen
controller will display the screen, as shown in
Figure 3-3.
1. Whentheunithasbeen“OFF”formorethan1minute
the controller will display the screen saver, as shown
in Figure 3-1. To start operation, push the “Enter/
Reset” button. The controller will display the “OFF”
screen, as shown in Figure 3-2.
ON/OFFbutton
Figure 3-3 Main Screen ON
Figure 3-1 Screen Saver
3. Tochangethetemperature,pushthe“TEMP”button.
The controller will display the screen, shown in
Figure 3-4. To change the left temperature, push the
“←”arrowbutton.Thenpusheitherthe“↑”arrowor“↓”
arrow buttons to increase or decrease temperatures
respectively. To change the right temperature, push
the“→”arrowbutton.Thenpusheitherthe“↑”arrowor
“↓” arrow buttons to increase or decrease tempera-
turesaccordingly.Whenthepropertemperaturesare
entered,pushthe“Enter/Reset”button.Thecontroller
will now show the display shown in Figure 3-3.
Figure 3-2 Main Screen OFF
TEMPSetbutton
Figure 3-4 Temperature Screen
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4. To change the conveyor belt speed, push the “TIME”
button.Thecontrollerwilldisplaythescreen,shownin
Figure3-5.Tochangetheminutesetting,pushthe“←”
arrow button. Then push either the “↑” arrow or “↓”
arrowbuttonstoincreaseordecreasethetimeaccord-
ingly. To change the second setting, push the “→”
arrow button. Then push either the “↑” arrow or “↓”
arrowbuttonstoincreaseordecreasethetimeaccord-
ingly. When the proper times are entered, push the
“ENTER/RESET”button.Thecontrollerwillnowshow
the display shown in Figure 3-3.
C. Daily Shutdown Procedure
1. Makecertaintherearenoproductsleftontheconveyor
in the oven.
2. Press the “ON/OFF” button to turn the oven off.
3. Open the window to allow the oven to cool faster.
4. Aftertheovenhascooledandtheblowershaveturnedoff,
the circuit breaker/fused disconnect may be turned off.
Quick Reference – Touch Screen Controller
A. Main Screen
1. ON/OFF button - Used to turn oven On and Off.
2. TIME - See Separate Instructions.
3. TEMP - See Separate Instructions.
Message Bar
Energy Level Indicators
4. Energylevelindicators-Indicatorstoeithersideofthe
screen indicate the energy input to that side of the
oven.
5. Messagebar-Indicatesvariousmessagespertaining
to current oven conditions.
B. Oven Temperature/Set Point/Indicator Screen
1. Right actual temperature - Indicates current average
temperature of the right side of the oven.
2. Left actual temperature - Indicates current average
temperature of the left side of the oven.
3. Set point temperature - Pressing on this value allows
the user to adjust the set point of the oven.
4. Exit - Returns to the main screen.
C. Energy Modes
ON/OFFbutton
TEMPbutton
TIMEbutton
Energy Mode One - This mode is automatic, and starts
(bake time +1 minute) after the last product has entered
theoven.Inthismode,themainovenblowerswilllowerto
1500RPM,whiletheovenmaintainstemperatureandbelt
speed.
Figure 3-5 Belt Speed Screen
B. Daily Startup Procedure
1. Check that the circuit breaker/fused disconnect is in
theOnposition.Checkthatthewindowisclosed.The
touch panel display should be lit.
2. Adjust the conveyor to the desired bake time.
3. Press the temperature button to display right and left
hand oven settings. Set temperatures as desired.
4. Press the “ON” button to activate the oven. The
conveyor will not run, until the oven temperature has
reached the set points.
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III. QUICK REFERENCE: TROUBLESHOOTING
SYMPTOM
PROBLEM
SOLUTION
Oven will not
turn On.
No electrical power
•
Check that the circuit breaker/fused disconnect is on. Make
sure the emergenct stop button is on.
Oven will not
heat.
No gas pressure
•
•
Make sure main gas is on.
Burner did not light
Turn oven off, and restart. If it still does not light, call for
service.
Oven is operating, but
little or no air is coming
from the fingers.
Air fingers may be as-
sembled incorrectly after
cleaning.
•
•
•
Turn oven off, and allow to cool. Reassemble fingers
correctly.
Conveyor will not move.
Oven is not up to operating
temperature.
Allow oven to preheat.
Conveyor may be jammed.
Turn oven off, and allow to cool. Check conveyor for block-
age.
IV. SCREEN ALERTS
SYMPTOM
PROBLEM
SOLUTION
Battery Symbol in the
lower right hand corner
The internal battery needs
to be replaced to retain
energy mode timings.
•
A qualified service technician should accomplish this.
High Control Compart-
ment Temperature
Clean and replace the
front fan filters.
•
•
Failure to do this will eventually shut down the oven due to
excessive temperature.
Main Blower problem or
Combustion Blower
problem.
The computer has
detected a problem with
either the main, or burner
blowers.
This should be corrected by a qualified service technician.
Control Over Temp
Front belt jammed
Front filters are clogged
Front belt has stopped
•
Clean or replace filters.
•
•
Remove obstruction, and restart oven.
If no obstruction, call service.
Rear Belt jammed
High Temp Error
Rear belt has stopped
•
•
Remove obstruction, and restart oven.
If no obstruction, call service.
Thermocouple or
PLC malfunction
•
Call service
Belt off-Oven not
in temperature
Normal operation until
Oven reaches operating
temperature
Energy Saving Mode 1
Normal operation
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E. Blower Belts
1. To gain access to each blower belt compartment remove
the four screws shown in Figure 4-8. Then, lift the rear
shroud off its hangers.
If access to the blower motors is required, remove the
three mounting screws (two on the front of each shroud
and one on the rear). Then, lift the end shroud straight up
and off its hangers.
2. Check each blower belt for cracking or excessive wear.
3. Check for amount of belt deflection in the center of the belt,
1/2″ deflection is acceptable, see Figure 4-9.
4. If necessary, replace belt.
IV. MAINTENANCE - EVERY 6 MONTHS
A. Check that the oven is cool and the power is disconnected
as described in the warning at the beginning of this Section.
B. For gas ovens, clean and inspect the burner nozzel and
electrode assembly.
C. Check (and clean, if necessary) the oven venting system.
D. Check the conveyor drive shaft bushings and spacers.
Replace the components if they are worn.
Figure 4-9 - Belt Deflection
21
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ITEM QTY.
P/N
DESCRIPTION
1
1
1
1
2
1
1
2
2
1
2
1
1
2
2
1
2
1
1
1
1
59081
58678
58679
59168
M9608
59337
M9616
57288
57141
50610
54727
M9887
41647
31651
33983
32108
59109
58668
58669
59112
DIGITALDISPLAY,PROGRAMMED
MOTOR,CONVEYORDRIVE
CONVEYORCONTROLBOARD
INVERTER,PROGRAMMED
POWERSUPPLY
2
3
4
5
6
KIT,THERMOCOUPLE (6THERMOCOUPLES)
FAN,COOLING
7
8
MOTOR,BLOWER
9A
9B
10
11
12
13
14
15
16
17
18
19
AIRSWITCH BURNER/BLOWER MOTOR
AIRSWITCH MAIN BLOWER
IGNITION MODULE
ASSEMBLY, BURNER BLOWER/MOTOR
VALVE, MODULATING GAS, 1/2"
AMPLIFIER,MODULATINGVALVE
HIGHLIMITCONTROLMODULE,240V
TRANSFORMER,240Vp:24Vs
PLC MODULE,PROGRAMMED
THERMOCOUPLE MODULE
CURRENT MODULE
PHOTOCELL
1
2
3
4
5
10
15
16, 17, 18
19
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Wiring Diagrams (electrical schematics)
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