Middleby Marshall Thermostat KIT P N 36939 User Manual

®
A MIDDLEBY COMPANY  
Digital Temperature Controller  
(KIT P/N 36939)  
Installation, Programming  
and Troubleshooting  
Instructions  
HEAT ON  
SET PT  
500 F  
ACTUAL  
TEMP  
SP LOCK  
OVER TEMP  
Kit Contents  
Description  
On/Off-PID Digital Temperature Controller w/brackets  
Installation, Programming, and Troubleshooting Instructions  
Operators Instructions  
Qty  
1
1
Part Number  
36056  
36622  
1
36940  
Middleby Marshall Inc. • 1400 Toastmaster Drive • Elgin, IL 60120 • (847) 741-3300 • FAX (847) 741-4406  
Middleby Corporation 24 Hour Service Hotline 1-800-238-8444  
©1997 Middleby Marshall Inc.  
Part # 36622  
P 9/97, Rev. B  
 
Unpacking  
The Digital Temperature Controller was checked before leaving the factory. Inspect the shipping container  
carefully for evidence of improper handling during shipment. In case of damage, make an immediate claim  
to the parts distributor from whom the unit was purchased. If the Digital Temperature Controller was shipped to  
you, notify the carrier without delay and file a claim.  
The installation process consists of:  
• Disconnecting the existing wiring and and removing the existing Temperature Controller.  
• Mechanically installing the replacement Digital Temperature Controller.  
• Making the appropriate electrical connections.  
When the installation is completed, check the Digital Temperature Controller for the desired oven operation. Also,  
demonstrate the use of the Digital Temperature Controller for the owner (operator) and leave a copy of the Operating  
Instructions (PN 36940).  
Disconnecting Existing Wires / Mechanical Installation  
The following provides mechanical installation instructions for the Digital Temperature Controller.  
WARNING  
To avoid electrical shock hazard, shut OFF all  
electrical power to the oven at the disconnect  
switch or circuit breaker before installing the  
Digital Temperature Controller.  
To remove the Existing Temperature Controller and to install the latest Digital Temperature Controller, proceed as fol-  
lows:  
Replacing an Analog Temperature Controller with the latest Digital Controller  
Step  
1.  
Procedure  
Disconnect all associated wiring from the terminals located on the rear of the Temperature Controller.  
Disconnect and retain any jumper wires. Be sure to tag the ends of controller wires with the number  
terminal they connect to. These old numbers will be used later to match them with the new Digital  
control terminal numbers as referenced in Table 1.  
2.  
3.  
Unscrew the two bracket screws and remove the bracket securing the control to the oven. Slide the  
bracket away from the controller. Remove the controller by pulling it out through the front of the panel.  
Go to “Installing the Digital Controller” on next page.  
Replacing any Digital Temperature Controller with the latest Digital Controller  
Step  
1.  
Procedure  
When converting a Digital Temperature Controller, PN 28071-0027, PN 28071-0028, PN 30871, or PN  
36021, to the latest digital controller, tag the wires and replace wire for wire since the terminal connec-  
tions are exactly the same. If replacing an existing 360EWB temperature controller, PN 32571, be sure  
to tag the mA output terminal wires for proper cross reference to the new controller as called out in  
step 4 under “Electrical Connections”.  
2.  
Remove the two clip style brackets on the top and bottom of the control. Remove the controller by  
pulling it out through the front of the panel. See Figure 1.  
2
 
Installing the Digital Controller  
Step  
1.  
Procedure  
Insert the Digital Temperature Controller into the same panel slot making sure the face of the controller  
is upright with the display on top and the push buttons on the bottom.  
2..  
3..  
Identify the two rectangular holes on top and bottom of the control case. Attach the two panel mounting  
brackets with the clips of the brackets and the heads of the screws pointing towards the rear of the new  
controller into these rectangular holes. See Figure 1.  
Tighten both screws evenly against the back side of control panel until the controller seats securely.  
SIDE VIEW  
Electrical Connections  
All electrical connections on the Digital Temperature Controller are made on two terminal strips located on the rear of the  
controller case. The existing oven wires are connected to the new terminal positions indicated in the analog to digital ter-  
minal cross reference in Figure 2.  
Proceed as follows to make electrical connections:  
1.  
2.  
Use Figure 2 and Table 1 to identify the electrical connections. Also refer to step 4 if installing the latest  
Temperature Controller for the Modulating Configuration used in a 360EWB oven.  
If you are replacing an Analog Controller, refer to the discontinued Analog Temperature Controller terminal num-  
bers which are shown in brackets ([ ]) next to the matching Digital Controller terminal. NOTE: All wires,  
including jumpers, will be reused from the existing temperature controller (analog or digital) with the new  
replacement digital temperature controller. CAUTION: DO NOT USE TERMINALS 15 & 16 ON THE “DIGITAL”  
TEMPERATURE CONTROLLER OR DAMAGE TO THE CONTROL WILL RESULT!  
3.  
If you are replacing an existing Digital Temperature Controller with the latest Digital Temperature Controller, PN  
36056, then simply ignore the bracketed terminal numbers which pertain to the Analog Controllers only and  
reconnect the same wires.  
4.  
If you are replacing a Modulating Digital Temperature Controller, PN 32571, with the latest digital tempera-  
ture control, PN 36056, be aware that the mA output terminals of the Temperature Controller, which feed the  
Amplifier Board, change from 4 & 5 to 15 & 16. See Figure 3.  
3
 
Table 1 - Terminal Cross Reference  
TERMINAL ON  
NEW MODULE:  
TERMINAL ON  
OLD MODULE:  
500  
DESCRIPTION OF TERMINAL  
1
2
5
+ T/C  
- T/C  
8
7
5
500  
Input to Temperature  
Control Relay  
Remove  
From  
Remove  
From  
Connect  
To  
Connect  
To  
6
Output to High Flame  
Solenoid or Heater  
Contactors  
4
[13]  
[14]  
[15]  
8
9
[1]  
[2]  
Not used on  
certain model  
gas and electric  
ovens.  
7
6
5
4
10  
L2  
L1  
G
Neutral  
Power  
Ground  
L2  
L1  
11  
12  
13  
14  
15  
16  
NO CONNECTION  
}
[16]  
[5]  
Standard On/Off output  
terminals for all models  
except 360EWB.  
13  
Input to Cool-Down  
Relay  
9
}
[6]  
NO CONNECTION  
}
}
[L2]  
[L1]  
[G]  
L2  
L1  
14  
Output from Cool-Down  
Relay  
10  
11  
12  
P.I.D. Output used only  
when the temperature controller  
is programmed for a model  
360EWB with the modulating  
gas control system.  
15  
Input to High-Limit  
Relay  
16  
Output from High-Limit  
Relay  
Figure 2 - Analog to Digital Terminal  
N/A  
Modulating Valve Output  
Terminals (360EWB ONLY)  
15  
16  
Cross Reference  
4-20 Milliamp Connection  
Output From Terminals 15 &16  
Move wires  
at terminals  
4 & 5 to 15 & 16  
for the model  
360EWB only  
8
9
10  
11  
12  
13  
14  
15  
7
6
0-24 VDC  
4-20 milliamps  
5
+
6
5
4
3
4
-
L2  
L1  
G
Purple  
+
- 16  
2
1
Purple/White  
24V AC  
Input  
Temperature Controller  
Amplifier Board  
Modulating Valve  
PN 36056  
(Kit PN 36939)  
Figure 3 - Modulating Control Circuit  
4
 
5.  
Check to be sure the oven’s thermocouple is the latest version flange mount style verses the obsolete version.  
See Figure 4 below.  
Flange  
Current Thermocouple  
cable  
PS360 (6.00”)  
PS200 (13.38”)  
Clip  
Obsolete Thermocouple  
Figure 4 - Current & Obsolete  
Thermocouple Comparison.  
The obsolete thermocouple is not compatible with the latest temperature controller, p/n 36056, and must be  
replaced with the latest thermocouple, kit p/n 33984 (300 Series ovens), and kit p/n 33985 (200 Series ovens).  
The obsolete thermocouples leads are grounded to the protective sheathing which causes an error signal with  
the latest controller’s thermocouple circuit.  
6.  
After becoming familiar with the various electrical connections pertaining to the specific model oven and its  
temperature controller, refer to table 2 for specific wiring instructions for all wires and any jumpers to be  
reinstalled.  
NOTES:  
________________________________________________________________________________  
________________________________________________________________________________  
________________________________________________________________________________  
________________________________________________________________________________  
________________________________________________________________________________  
________________________________________________________________________________  
________________________________________________________________________________  
5
 
NOTE  
Be sure to replace any jumper wire specified  
in the wiring diagram.  
Table 2 - Wiring Configurations  
Oven Model Number  
Related Figure  
PS200 Gas Oven, 208-240V, 50/60Hz, 1 Ph, 3W...............................................................Figure 5  
PS200 Gas Oven, 200V, 50/60Hz,1 Ph, 2W (Export Only)................................................Figure 5  
PS200 Gas Oven, 208V, 50/60Hz,1 Ph, 2W (Export Only)................................................Figure 5  
PS200 Gas Oven, 220-240V, 50/60Hz, 1 Ph, 2W (Export Only)........................................Figure 5  
PS200 Electric Oven, 208-240V, 50/60Hz 3Ph, 4W  
(for models built before December 1996)..................................................Figure 8  
(for models built in December 1996 and later)..........................................Figure 9  
PS200 Electric Oven, 380V, 50/60Hz, 3Ph, 4W (Export Only)  
(for models built before December 1996)...................................................Figure 8  
(for models built in December 1996 and later)...........................................Figure 9  
PS200 Electric Oven, 400-416V, 50/60Hz, 3Ph, 4W (Export Only)  
(for models built before December 1996)..................................................Figure 8  
(for models built in December 1996 and later)..........................................Figure 9  
PS250 Gas and Electric Ovens with early style..................................................................Figure 7  
Analog Controller Part Number 28071-0009  
PS250 Gas and Electric Ovens with later style...................................................................Figure 6  
Analog Controller Part Number 28071 -0012  
PS300/304/350 (All Gas and Electric Ovens are the same)................................................Figure 6  
PS310/314/360, 360WB Gas Oven, 208-240V, 50/60Hz,1Ph, 3W......................................Figure 5  
PS310/314/360, 360WB Gas Oven, 208-240V, 50/60Hz,1 Ph, 2W (Export Only)..............Figure 5  
PS310/314/360, 360WB Gas Oven, 190-380V, 50/60Hz,1Ph, 2W (Export Only)...............Figure 5  
PS310/314/360, Electric Oven, 200-220V, 50/60Hz, 3Ph, 3W (Export Only)......................Figure 6  
PS310/314/360, Electric Oven, 208-240V, 50/60Hz, 3Ph, 4W.............................................Figure 6  
(with Single Phase Blower Motors)  
(with 3 Phase Blower Motors)....................................................................Figure 6  
PS310/314/360, Electric Oven, 240V, 50/60Hz, 3Ph, 3W....................................................Figure 6  
PS310/314/360, Electric Oven, 380V, 50/60Hz, 3Ph, 3W (Export Only).............................Figure 5  
PS310/314/360, Electric Oven, 480V, 50/60Hz, 3Ph, 3W....................................................Figure 5  
PS310/314/360, Electric Oven, 400-440V, 50/60Hz, 3Ph, 3W (Export Only)......................Figure 5  
PS360WB-70 Gas Oven, 208-240V, 50/60HZ, 1Ph, 3W......................................................Figure 10  
PS360EWB Gas Oven, 208-240V, 50/60HZ, 1Ph, 3W.........................................................Figure 11  
PS570 Gas Oven, All Units.................................................................................................. Figure 9  
PS200 Gas CE Oven, All Units.............................................................................................Figure 12  
PS200 Electric CE Oven, All Units....................................................................................... Figure 13  
PS360/360WB Gas CE Oven, All Units................................................................................Figure 12  
PS360/360WB Electric CE Oven, All Units...........................................................................Figure 13  
6
 
Figure 5 - Wiring Diagram Showing Electrical Connections  
(Refer to Table 2)  
Figure 6 - Wiring Diagram Showing Electrical Connections  
(Refer to Table 2)  
Figure 7 - Wiring Diagram Showing Electrical Connections  
(Refer to Table 2)  
Figure 8 - Wiring Diagram Showing Electrical Connections  
(Refer to Table 2)  
Figure 9 - Wiring Diagram Showing Electrical Connections  
(Refer to Table 2)  
Figure 10 - Wiring Diagram Showing Electrical Connections  
(Refer to Table 2)  
7
 
Purple  
Purple/White  
Figure 11 - Wiring Diagram Showing Electrical Connections  
(Refer to Table 2)  
Figure 12 - Wiring Diagram Showing Electrical Connections  
(Refer to Table 2)  
Figure 13  
Programming  
After the Digital Temperature Control has been properly installed and wired, it is ready to be programmed for either the  
standard on/off cycling gas solenoid/electric heating system, or the modulating gas valve system. Then, as requested by  
the customer, the controller can be set for set lock configuration, F or C operation, and the display type. This function is  
to be done by the authorized technician. See Figure14 Service Instructions for details. NOTE: The temperature con-  
troller is pre-programmed for On/Off operation, open set lock, and set point display.  
Once the Digital Temperature Control has been service programmed, it then can be operator programmed for set point.  
See Figure 15 Operator Instructions for details.  
Be sure to thoroughly go over the Operator Instructions with the customer to be sure they are familiar with the new con-  
trol. Leave the spare copy of the Operator Instructions, PN 36940, with the customer for their future reference.  
A copy is enclosed with the new temperature control.  
8
 
Digital Temperature Controller  
PN 36056  
Service instructions  
Push the lock key and the service key together to reach SP LOK,  
Indicator flashing  
+
then use the service key to step through the other functions listed  
below.  
Indicator not flashing  
LOCK SERVICE  
Use the arrow keys to change the function settings.  
KEY  
KEY  
Factory settings are as shown below.  
HEAT ON  
SET PT  
HEAT ON  
SET PT  
ACTUAL  
TEMP  
HEAT ON  
SET PT  
HEAT ON  
g
E  
SET = set point display  
ACT = actual temperature  
display.  
68F  
5  
no  
SET PT  
ACTUAL  
TEMP  
d E F  
ACTUAL  
TEMP  
ACTUAL  
TEMP  
SP LOCK  
OVER TEMP  
SP LOCK  
OVER TEMP  
SP LOCK  
SP LOCK  
OVER TEMP  
OVER TEMP  
This function will record the  
highest ambient temperature of  
the temperature controller;  
68ºF/20ºC is the original  
reading.  
NO = set point  
F = degrees Fahrenheit  
C = degrees Celsius  
unlocked  
YES = set point  
locked  
If the “On/Of” setting is chosen, the  
“LyES” display will be bypassed.  
This display allows programming the controller for either the  
standard ON/OFF mode or the PID (360EWB models) mode for  
the modulating gas control system.  
or  
HEAT ON  
y
n F P d  
O O  
0
SET PT  
ACTUAL  
TEMP  
L E S  
b
SP LOCK  
OVER TEMP  
Confirms that the Pid  
(Modulating) setting  
has been locked in if  
the Pid setting was  
chosen.  
Push the lock key and the display key to  
1)  
2)  
+
enable the programming function of the  
“OnOF or “Pid” temperature control  
system.  
This display is the BIAS (actual  
temperature) adjustment scale  
which is Factory set at zero.  
The Factory must be consulted  
for any adjustments to the  
BIAS.  
LOCK  
KEY  
DISPLAY  
KEY  
OnOF = standard on/off temperature cycling system (gas & electric)  
PiD = modulating temperature proportioning system  
(gas 360 EWB only)  
Figure 14 - Service Instructions  
 
Digital Temperature Controller  
P/N 36056 Operators Instructions  
HEAT ON:  
Controller calling for heat when lit. High  
flame on. Once the oven reaches  
temperature the LED will cycle on and  
off.  
DISPLAY:  
Temperature displayed in  
degrees Fahrenheit or Celsius  
SP LOCK:  
HEAT ON  
SET PT  
N/A to operator  
250 F  
OVER TEMP  
250 F  
ACTUAL  
TEMP  
SET PT: Lit when controller is  
displaying set point temperature.  
OVER TEMP:  
Over Temperature condition when lit.  
On above 650ºF(343ºC)  
SP LOCK  
ACTUAL TEMP: Lit when control is  
displaying actual oven temperature  
TEMPERATURE KEY:  
Use to view actual oven  
temperature  
SERVICE KEY:  
Service use only  
UNLOCK KEY:  
Used in conjunction with SET POINT  
KEY to unlock SET POINT for 60  
seconds.  
SET POINT KEY:  
Used in conjunction with  
UNLOCK KEY to unlock SET  
POINT for 60 seconds.  
UP and DOWN arrow keys:  
Used to change the set point.  
If SET POINT will not change  
and lower display flashes then  
see below  
+
Press UNLOCK & SET POINT  
keys simultaneously to unlock  
set point, UP & DOWN keys will  
now function for 60 seconds.  
Figure 15 - Operators Instructions  
 
Diagnostic Error Messages  
The controller runs background tests during normal operation. If a problem with the background tests occurs, an error  
message is shown (flashing) in the Display. These are called Diagnostic Error Messages (Table 3).  
Table 3 - Diagnostic Error Messages  
Corrective Action  
Display  
rPLC  
Flashes on the display  
alternately with  
1. Turn Blower Switch OFF for 2  
minutes, then Turn Blower Switch  
ON.  
temperature indicating  
that the controller’s  
internal diagnostics test  
has failed.  
2. Replace the controller if the  
problem does not clear after repeating  
action 1 above three times.  
rSET  
1. Turn Blower Switch OFF for 2  
minutes, then Turn Blower Switch  
ON.  
Oven temperature has  
not reached at least  
200˚F(93˚C) within 15  
minutes of operation;  
2. If problem does not clear, call  
the Middleby Cooking Systems  
Group (MCSG) for assistance.  
usually a result of the  
burner not lighting.  
1. Check that the thermocouple is  
connected to terminals 7 & 8 of the  
temperature controller.  
2. If connections are good, then check  
the continuity of the thermocouple at  
room temperature. The resistance  
reading should be in the 9 - 20 Ohm  
range. Remove & replace an open  
thermocouple.  
OPEn  
Caused by an  
open circuit in the  
thermocouple circuit.  
3. If the thermocouple checks good,  
call MCSG for assistance.  
1. Check the polarity of the  
thermocouple leads; terminal 7 (-)  
RED wire & terminal 8 (+) WHITE  
wire.  
r TC  
Reverse polarity of the  
thermocouple leads.  
2. If polarity connections are  
correct replace thermocouple.  
Middleby Marshall Inc. • 1400 Toastmaster Drive • Elgin, IL 60120 • (847) 741-3300 • FAX (847) 741-4406  
Middleby Corporation 24 Hour Service Hotline 1-800-238-8444  
©1997 Middleby Marshall Inc.  
Page 11 of 11  
Part # 36622  
P 9/97, Rev. B  
 

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