Blodgett Mark V Installation and operating manual

MARK V SERIES
CONVECTION OVEN
SERVICE AND REPAIR MANUAL
BLODGETT OVEN COMPANY
www.blodgett.com
44 Lakeside Avenue, Burlington, Vermont 05401 U A Telephone (802) 658Ć6600 Fax: (802)864Ć0183
PN 33144 Rev F (7/02)
E 2002 - G. . Blodgett Corporation All rights reserved.
Duplication of the information in this manual is prohibited without the consent of the Blodgett ervice Department.

TABLE OF CONTENTS
i
1. INTRODUCTION
Oven pecifications 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. OPERATION
equence of Operations 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cook Only - 18459 Rev D 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CE Approved Cook Only - 33339 Rev C 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cook and Hold - 18791 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
olid tate Digital - 30070 Rev B 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CE Approved olid tate Digital - 33345 Rev C 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Delay with Pulse Plus - 18466 Rev D 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Humidaire - 1846 Rev M 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellihold and Intelliplus - 22027 Rev A 2-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellitouch - 19361 Rev A 2-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blodgett IQ Control - 33078 Rev A 2-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. CALIBRATION AND ADJUSTMENT
Doors 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Blower witch 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
olid tate Manual 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
olid tate Digital Control 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellihold and Intelliplus Controls 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellitouch Control 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellitouch II Control 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blodgett IQ Control 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blodgett IQ2T Control Factory Level Programming 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IQ VVCĆ208 Control 3-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Resistance vs Heating Elements 3-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Resistance vs Temperature 3-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. TROUBLESHOOTING
Heat ystem 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Error Codes 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellitouch 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intellihold and Intelliplus 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blodgett IQ Control 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TABLE OF CONTENTS
ii
5. PARTS REPLACEMENT
Door Assembly 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Arm upport Assembly 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Window Assembly 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compartment Liner Bottom 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Motor and Blower Assembly 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Wheel 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Motor 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Components 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb and Capillary Thermostat 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Components Located in the Control Module 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door witch 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INTRODUCTION
CHAPTER 1

MARK V
1-1
OVEN SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
In tallation within the U.S. and Canada
ingle phase models require a 60 Hz,
208/240VAC, 3 wire service consisting of L1, L2
and ground. Three phase models require a 60 Hz,
208/240/440/480, 4 wire service consisting of L1,
L2, L3 and ground. Wiring from the power source
to any of the single phase units must be a minimum
of #6 AWG copper stranded wire. Wiring from the
power source to the 208/240 three phase units
must be a minimum of #8 AWG copper stranded
wire. Wiring from the power source to the 440/480
three phase units must be a minimum of #12 AWG
copper stranded wire.
General Export In tallation
ingle phase models require a 50 Hz,
220/240VAC, 3 wire service consisting of L1, L2
and ground. Three phase models require a 50 Hz,
415/240 or 380/220 VAC, 5 wire service consisting
of L1, L2, L3, neutral and ground. Use 90_C wire
and size according to local codes.
CE approved in tallation
ingle phase models require a 50 Hz, 230VAC 3
wire service consisting of L1, neutral and ground.
Three phase models require a 50 Hz, 400/230VAC,
5 wire service consisting of L1, L2, L3, neutral and
ground. Use 90_C wire and size according to local
codes.
ELECTRICAL SPECIFICATIONS (per ection)
KW Hz Volt Pha e Amp Electrical Connection
(ii i )
L1 L2 L3 N (minimum ize)
U.S. and Canadian in tallation
11.0 60 208 1 51 - 51 - 6 AWG
11.0 60 208 3 31 29 29 - 8 AWG
11.0 60 220Ć240 1 44 - 44 - 6 AWG
11.0 60 220Ć240 3 26 24 24 - 8 AWG
11.0 60 440 3 15 14 14 - 12 AWG
11.0 60 480 3 14 13 13 - 12 AWG
General Export in tallation
11.0 50 208 3 18 18 18 4 ize per local code
11.0 50 220Ć240 1 48 - - 48 ize per local code
11.0 50 220/380 3 18 16 16 2 ize per local code
11.0 50 240/415 3 18 14 14 4 ize per local code
11.0 50 230/400 3 18 15 15 3 ize per local code
CE in tallation
11.0 50 400 3N 18 15 15 3 ize per local code

OPERATION
CHAPTER 2

MARK V
2-1
SEQUENCE OF OPERATIONS
NOTE: The following ins ruc ions represen he mos common con rollers. For ques ions regarding o her
op ions call he Blodge Service Depar men a (800)331Ć5842.
COOK ONLY - 18459 REV D
Component Reference
NOTE: Refer o FIGURE 1 page 2-2 for compoĆ
nen loca ions.
1. MODE ELECTOR WITCH
2. COOK TIMER
3. DOOR WITCH
4. TEMPERATURE CONTROL BOARD
5. AXIAL FAN
6. CONV ECTION FAN MOTOR
7. TEMPERATURE PROBE
8. OLID TATE POTENTIOMETER
9. CENTRIFUGAL WITCH
10. COOK LIGHT
11. ELEMENT CONTACTOR
12. HEATING ELEMENT
13. 50 WATT LAMP
14. LIGHT WITCH
15. TIMER MOTOR
16. BUZZER
Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to terminal #1 of the
cook timer (2), one side of the door switch (3),
terminal #8 of the temperature control board
(4) and the axial fan (5).
2. If the doors are closed the door switch (3)
should also be closed sending power to termiĆ
nal #6 of the temperature control board (4)
and to the convection fan motor (6).
NOTE: This mo or has a buil in cen rifugal
swi ch (9) ha closes when he mo or
reaches full speed. If found faul y do
no bypass, he whole mo or should be
replaced.
3. On a call for heat from the temperature control
circuit, a circuit is completed between termiĆ
nals #6 and #7 of the temperature control
board (4).
NOTE: The empera ure con rol circui conĆ
sis s of he empera ure probe (7), he
empera ure con rol board (4) and he
solid s a e po en iome er (8).
Power is sent out of terminal #7 to one side of
the centrifugal switch (9). If the convection fan
motor (6) is at full speed the centrifugal switch
(9) closes sending power to the cook light (10)
and one side of the element contactor (11).
When the contactor closes the heating eleĆ
ments (12) power up.
4. The 50 watt lamps (13) only receive power when
the light switch (14) is activated. These lamps
are 115 volt and are wired in series parallel.
5. When the cook timer (2) is set for a time a cirĆ
cuit is made between terminals #1 and #2
powering up the timer motor (15). At the expiĆ
ration of the set time the switch in the cook timĆ
er (2) toggles from 1-2 to 1-4 powering up
the buzzer (16).
NOTE: Pu he imer in he home posi ion o siĆ
lence he buzzer.
NOTE: Turn he mode selec or swi ch o cool
down o bypass he door microswi ch. This
allows he convec ion fan mo or o opera e
even when he doors are open.
NOTE: This oven may be conver ed from single o
hree phase, however, con ac ors mus be
changed due o he difference in amp
draw. Reference de ail inse in FIGURE 1.
NOTE: The resis ive values for he probes used in
his oven have descending empera ure
coefficien s. As he empera ure increases
he resis ive values decrease.
NOTE: Reference page 4-2 of he Troubleshoo Ć
ing sec ion for he resis ive values of he
hea ing elemen s. The reading should be
aken in a cold s a e.

OPERATION
2-2
1
2
3
4
15 16
9
8
7
14
6
12
13
5
10
11
FIGURE 1

MARK V
2-3
CE APPROVED COOK ONLY - 33339 REV C
Component Reference
NOTE: Refer o FIGURE 2 page 2-4 for compoĆ
nen loca ions.
1. MODE ELECTOR WITCH
2. COOK TIMER
3. DOOR WITCH
4. TEMPERATURE CONTROL BOARD
5. AXIAL FAN
6. CONVECTION FAN MOTOR
7. TEMPERATURE PROBE
8. OLID TATE POTENTIOMETER
9. CENTRIFUGAL WITCH
10. HIGH LIMIT WITCH
11. ELEMENT CONTACTOR
12. COOK LIGHT
13. HEATING ELEMENT
14. 50 WATT LAMP
15. LIGHT WITCH
16. TIMER MOTOR
17. BUZZER
Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to terminal #1 of the
cook timer (2), one side of the door switch (3),
terminal #8 of the temperature control board
(4) and the axial fan (5).
2. If the doors are closed the door switch (3)
should also be closed sending power to termiĆ
nal #6 of the temperature control board (4)
and to the convection fan motor (6).
NOTE: This mo or has a buil in cen rifugal
swi ch (9) ha closes when he mo or
reaches full speed. If found faul y do
no bypass, he whole mo or should be
replaced.
3. On a call for heat from the temperature control
circuit, a circuit is completed between termiĆ
nals #6 and #7 of the temperature control
board (4).
NOTE: The empera ure con rol circui conĆ
sis s of he empera ure probe (7), he
empera ure con rol board (4) and he
solid s a e po en iome er (8).
Power is sent out of terminal #7 to one side of
the centrifugal switch (9). If the convection fan
motor (6) is at full speed the centrifugal switch
(9) closes sending power to one side of a high
limit switch (10), if the high limit is closed then
power will be sent to one side of the contactor
(11) and an indicator light (12). When the conĆ
tactor closes the heating elements (12) power
up.
4. The 50 watt lamps (13) only receive power when
the light switch (14) is activated.
5. When the cook timer (2) is set for a time a cirĆ
cuit is made between terminals #1 and #2
powering up the timer motor (15). At the expiĆ
ration of the set time the switch in the cook timĆ
er (2) toggles from 1-2 to 1-4 powering up
the buzzer (16).
NOTE: Pu he imer in he home posi ion o siĆ
lence he buzzer.
NOTE: Turn he mode selec or swi ch o cool
down o bypass he door microswi ch. This
allows he convec ion fan mo or o opera e
even when he doors are open.
NOTE: This oven may be conver ed from single o
hree phase, however, con ac ors mus be
changed due o he difference in amp
draw. Reference de ail inse in FIGURE 2.
NOTE: Reference page 4-2 of he Troubleshoo Ć
ing sec ion for he resis ive values of he
hea ing elemen s. The reading should be
aken in a cold s a e.

OPERATION
2-4
1
15
3
6
14
4
2
17
11
12
10
9
5
13
7
8
FIGURE 2

MARK V
2-5
COOK AND HOLD - 18791
Component Reference
NOTE: Refer o FIGURE 3 page 2-7 for compoĆ
nen loca ions.
1. MODE ELECTOR WITCH
2. COOK TIMER
3. COOK TEMPERATURE CONTROL BOARD
4. HOLD TEMPERATURE CONTROL BOARD
5. AXIAL FAN
6. DPDT RELAY COIL
7. DOOR WITCH
8. CONV ECTION FAN MOTOR
9. TEMPERATURE PROBE
10. OLID TATE POTENTIOMETER
11. CENTRIFUGAL WITCH
12. COOK LIGHT
13. ELEMENT CONTACTOR
14. HEATING ELEMENT
15. TIMER MOTOR
16. BUZZER
17. COOK AND HOLD TIMER
18. COOK AND HOLD LIGHT
19. TEMPERATURE PROBE
20. OLID TATE POTENTIOMETER
21. 50 WATT LAMP
22. LIGHT WITCH
Cook Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to terminal #1 of the
cook timer (2), terminals #6 and #8 of the cook
temperature control board (3), terminal #8 of
the hold temperature control board (4) and the
axial fan (5). Power is also applied to the N.C.
set of contacts in a DPDT relay (6).
NOTE: The coil of his relay will only be ac iĆ
va ed when he hold imer is se .
2. If the doors are closed the door switch (7)
should also be closed sending power to termiĆ
nal #3 of the mode selector switch (1). The
mode selector switch should already be made
between terminals #3 and N completing the
circuit to the convection fan motor (8).
NOTE: This mo or has a buil in cen rifugal
swi ch (11) ha closes when he mo or
reaches full speed. If found faul y do
no bypass, he whole mo or should be
replaced.
3. On a call for heat from the cook temperature
control system a circuit is completed between
terminals #6 and #7 of the temperature conĆ
trol board (3).
NOTE: The empera ure con rol sys em conĆ
sis s of he empera ure probe (9), he
empera ure con rol board (3) and he
solid s a e po en iome er (10)
Power is sent out of terminal #7 to the N.C. terĆ
minal of the DPDT relay (6). This relay should
be made between the N.C. terminal and the
common terminal sending power to one side
of the centrifugal switch (11). If the convection
fan motor (8) is at full speed the centrifugal
switch (11) closes sending power to the cook
light (12) and one side of the element contactor
(13). When the contactor closes the heating
elements (14) power up.
4. When the cook timer (2) is set for a time a cirĆ
cuit is made between terminals #1 and #2
powering up the timer motor (15). At the expiĆ
ration of the set time the switch in the cook timĆ
er (15) toggles from 1-2 to 1-4 powering up
the buzzer (16).
NOTE: Pu he imer in he home posi ion o siĆ
lence he buzzer.
5. The 50 watt lamps (21) only receive power when
the light switch (22) is activated. These lamps
are 115 volt and are wired in series parallel.
Cook and Hold Operation
1. Turn the mode selector switch (1) to the cook
and hold position. Power goes to terminal #1
of the cook and hold timer (17). When the cook
and hold timer is set power goes to terminal #6
of the hold temperature controller (4), the coil
of the DPDT relay (6) and the cook and hold
light (18). When the DPDT relay powers up the
switches in the relay toggle from the N.C. to the
N.O. position.
2. On a call for heat from the hold temperature
control system, a circuit is completed beween
terminals #6 and #7 of the hold temperature
control board (4).

OPERATION
2-6
NOTE: The hold empera ure con rol sys em
consis s of he empera ure probe (19),
he hold empera ure con rol board (4)
and he solid s a e po en iome er (20).
Power goes to the N.O. terminals of the DPDT
relay (6). Circuits should be made between the
N.O. and common terminals of the DPDT relay
(6) allowing power to run to the convection fan
motor (8) and one side of the centrifugal switch
(11). If the convection fan motor (8) is at full
speed the centrifugal switch (11) closes sending
power to the cook light (12) and one side of the
element contactor (13). When the contactor
closes the heating elements (14) power up.
NOTE: In cook and hold mode only, he conĆ
vec ion fan cycles on and off wi h he
hold hermos a sys em.
3. The 50 watt lamps (21) only receive power when
the light switch (22) is activated. These lamps
are 115 volt and are wired in series parallel.
NOTE: The po en iome er and probes for cook
and cook & hold are iden ical. The cook
and cook & hold empera ure boards are
NOT in erchangeable.
NOTE: Turn he mode selec or swi ch o cool
down o bypass he door microswi ch. This
allows he convec ion fan mo or o opera e
even when he doors are open.
NOTE: This oven may be conver ed from single o
hree phase, however, con ac ors mus be
changed due o he difference in amp
draw. Reference de ail inse in FIGURE 3.
NOTE: The resis ive values for he probes used in
his oven have descending empera ure
coefficien s. As he empera ure increases
he resis ive values decrease.
NOTE: Reference page 4-2 of he Troubleshoo Ć
ing sec ion for he reis ive values of he
hea ing elemen s. The reading should be
aken in a cold s a e.

MARK V
2-7
1
17
216
15
3
9
6
10 19
4
5
6
18
20
12
13
11
81
7
21
14
22
FIGURE 3

OPERATION
2-8
SOLID STATE DIGITAL - 30070 REV B
Component Reference
NOTE: Refer o FIGURE 4 page 2-9 for compoĆ
nen loca ions.
1. MODE ELECTOR WITCH
2. DOOR WITCH
3. TIME AND TEMPERATURE CONTROLLER
4. AXIAL FAN
5. CENTRIFUGAL WITCH
6. CONVECTION FAN MOTOR
7. HOT AIR ELEMENT CONTACTOR
8. HEATING ELEMENT
9. TRAN FORMER
10. 50 WATT LAMP
11. LIGHT WITCH
Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to one terminal of the
door switch (2), terminal J8 of the temperature
controller (3), and the axial fan (4). The main
blower fan starts. If a temperature is proĆ
grammed into the controller, the power goes
from J9 to the centrifugal switch (5) in the conĆ
vection fan motor (6).
2. If the doors are closed, the door switch (2)
should also be closed, sending power to the
common terminal of the time and temperature
controller (3). The relay on this controller
should be closed since a temperature has
been programmed into the controller. A circuit
is made between common and N.O. sending
power to, and starting the convection fan moĆ
tor (6).
NOTE: The relay in he ime and empera ure
con roller is no field repairable. If
diagnosed as defec ive, he en ire
board mus be replaced.
3. When the convection fan motor (6) reaches full
speed the centrifugal switch (5) closes sendĆ
ing power to the coil of the hot air element conĆ
tactor (7). When the contactor closes power is
sent to the heating elements (8).
4. The 50 watt lamps (10) only receive power when
the light switch (11) is activated. These lamps
are 115 volt and are wired in series parallel.
NOTE: Turn he mode selec or swi ch o cool
down o bypass he door microswi ch. This
allows he convec ion fan mo or o opera e
even when he doors are open.
NOTE: This oven may be conver ed from single o
hree phase, however, con ac ors mus be
changed due o he difference in amp
draw. Reference de ail inse in FIGURE 4.
NOTE: The resis ive values for he probes used in
his oven have descending empera ure
coefficien s. As he empera ure increases
he resis ive values decrease.
NOTE: Reference page 4-2 of he Troubleshoo Ć
ing sec ion for he reis ive values of he
hea ing elemen s. The reading should be
aken in a cold s a e.

MARK V
2-9
1
11
2
3
4
5
6
7
10
8
8
8
8
8
8
99
FIGURE 4

OPERATION
2-10
CE APPROVED SOLID STATE DIGITAL - 33345 REV C
Component Reference
NOTE: Refer o FIGURE 5 page 2-11 for compoĆ
nen loca ions.
1. MODE ELECTOR WITCH
2. DOOR WITCH
3. TIME AND TEMPERATURE CONTROLLER
4. AXIAL FAN
5. CENTRIFUGAL WITCH
6. CONVECTION FAN MOTOR
7. HIGH LIMIT WITCH
8. HOT AIR ELEMENT CONTACTOR
9. HEATING ELEMENT
10. 50 WATT LAMP
11. LIGHT WITCH
Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to one terminal of the
door switch (2), terminal J8 of the temperature
controller (3), and the axial fan (4). The main
blower fan starts. If a temperature is proĆ
grammed into the controller, the power goes
from J9 to the centrifugal switch (5) in the conĆ
vection fan motor (6).
2. If the doors are closed, the door switch (2)
should also be closed, sending power to the
common terminal of the time and temperature
controller (3). The relay on this controller should
be closed since a temperature has been proĆ
grammed into the controller. A circuit is made
between common and N.O. sending power to,
and starting the convection fan motor (6).
NOTE: The relay in he ime and empera ure
con roller is no field repairable. If
diagnosed as defec ive, he en ire
board mus be replaced.
3. When the convection fan motor (6) reaches full
speed the centrifugal switch (5) closes sending
power to the high limit (7). If the high limit is
closed, power goes to the coil of the hot air eleĆ
ment contactor (8). When the contactor closes
power is sent to the heating elements (9).
4. The 50 watt lamps (10) only receive power when
the light switch (11) is activated.
NOTE: Turn he mode selec or swi ch o cool
down o bypass he door microswi ch. This
allows he convec ion fan mo or o opera e
even when he doors are open.
NOTE: The resis ive values for he probes used in
his oven have descending empera ure
coefficien s. As he empera ure increases
he resis ive values decrease.

MARK V
2-11
1
2
4
5
7
3
10
6
11
9
8
FIGURE 5

OPERATION
2-12
FAN DELAY WITH PULSE PLUS - 18466 REV D
Component Reference
NOTE: Refer o FIGURE 6 page 2-13 for compoĆ
nen loca ions.
1. MODE ELECTOR WITCH
2. COOLING FAN
3. TEMPERATURE CONTROLLER
4. 10 MINUTE FAN DELAY TIMER
5. 30 MINUTE COOK TIMER
6. DOOR WITCH
7. PDT BLOWER WITCH
8. CONVECTION FAN MOTOR
9. TEMPERATURE PROBE
10. POTENTIOMETER
11. HOT AIR ELEMENT CONTACTOR
12. COOK LIGHT
13. HOT AIR ELEMENT
14. REPEAT HOT PUL E TIMER
15. TPDT RELAY
16. FAN ON LIGHT
17. FAN OFF LIGHT
18. 50 WATT LAMP
19. LIGHT WITCH
Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to the cooling fan (2), terĆ
minal #8 of the temperature controller (3), and
terminal #1 of the ten minute fan delay timer (4).
2. If the ten minute fan delay timer is in the timed
out position a switch is made between terminals
#1 and #4 sending power to terminal #1 of the
thirty minute cook timer (5). Power is also sent
to one side of the door switch (6). If the doors are
closed the door switch should also be closed
sending power to terminal #6 of the temperature
control board (3) and the common terminal of a
PDT blower switch (7). The speed of the conĆ
vection fan motor (8) is dependant on the posiĆ
tion of the PDT blower switch.
3. On a call for heat from the cook temperature
control system a circuit is completed between
terminals #6 and #7 of the temperature conĆ
trol board (3).
NOTE: The empera ure con rol sys em conĆ
sis s of he empera ure probe (9), he
empera ure con rol board (3) and he
solid s a e po en iome er (10)
Power is sent out of terminal #7 to one coil of
the hot air element contactor (11) and the cook
light (12). When the contactor is energized the
hot air element (13) powers up.
4. To enable the pulse plus feature, the ten minĆ
ute fan delay timer (4) must be set to a time. A
switch is then made between terminals #1 and
#2 sending power to terminal #2 of a repeat
shot pulse timer (14).
NOTE: By se ing he en minu e fan delay imer
(4) power is in errup ed o he hir y minĆ
u e cook imer (5) making i inopera ive.
The repeat shot pulse timer cycles a TPDT relay
(15) interrupting the circuit to the convection fan
motor (8). The convection fan motor cycles on
and off for approximately thirty second intervals
for the duration of the time set on the ten minute
fan delay timer (4). The fan on light (16) illumiĆ
nates whenever the TPDT relay closes. The fan
off light (17) illuminates whenever the ten minute
fan delay timer is set for a time.
5. The 50 watt lamps (18) only receive power when
the light switch (19) is activated. These lamps
are 115 volt and are wired in series parallel.
NOTE: Turn he mode selec or swi ch o cool
down o bypass he door microswi ch. This
allows he convec ion fan mo or o opera e
even when he doors are open.
NOTE: This oven may be conver ed from single o
hree phase, however, con ac ors mus be
changed due o he difference in amp
draw. Reference de ail inse in FIGURE 6.
NOTE: The resis ive values for he probes used in
his oven have descending empera ure
coefficien s. As he empera ure increases
he resis ive values decrease.

MARK V
2-13
1
19
7
9
3
14
4
65
15 16
17 11
12
10
2
8
13
18
13
FIGURE 6

OPERATION
2-14
HUMIDAIRE - 1846 REV M
Component Reference
NOTE: Refer o FIGURE 7 page 2-16 for compoĆ
nen loca ions.
1. MODE ELECTOR WITCH
2. COOK TIMER
3. DOOR WITCH
4. TEMPERATURE CONTROL BOARD
5. PDT BLOWER WITCH
6. INGLE HOT TIMER
7. P T THERMAL WITCH
8. TEMPERATURE PROBE
9. POTENTIOMETER
10. COOK LIGHT
11. ELEMENT CONTACTOR
12. HEATING ELEMENT
13. 50 WATT LAMP
14. LIGHT WITCH
15. TIMER MOTOR
16. BUZZER
17. TEAM DURATION POTENTIOMETER
18. TEAM CYCLE TART WITCH
19. WATER OLENOID VALVE
20. TEAM LIGHT
21. CONVECTION FAN
22. AXIAL COOLING FAN
Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to terminal #1 of the
cook timer (2), one side of the door switch (3),
terminal #8 of the temperature control board
(4) and the axial cooling fan (22)
2. If the doors are closed the door switch (3) should
also be closed sending power to terminal #6 of
the temperature control board (4), the PDT blowĆ
er switch (5), terminal #1 of a single shot timer (6),
and one side of a P T thermal switch (7).
3. On a call for heat from the temperature control
circuit a circuit is completed between terminals
#6 and #7 of the temperature control board (4).
NOTE: The empera ure con rol circui conĆ
sis s of he empera ure probe (8), he
empera ure con rol board (4) and he
solid s a e po en iome er (9).
Power is sent out of terminal #7 sending power
to the cook light (10) and one side of the eleĆ
ment contactor (11). When the contactor
closes the heating elements (12) power up.
4. The 50 watt lamps (13) only receive power when
the light switch (14) is activated. These lamps
are 115 volt and are wired in series parallel.
5. When the cook timer (2) is set for a time a cirĆ
cuit is made between terminals #1 and #2
powering up the timer motor (15). At the expiĆ
ration of the set time the switch in the cook timĆ
er (2) toggles from 1-2 to 1-4 powering up
the buzzer (16).
NOTE: Pu he imer in he home posi ion o siĆ
lence he buzzer.
6. If the oven is above 212_F (100_C) as sensed by
the thermal switch (7) the switch closes sending
power to the steam cycle start switch (18).
NOTE: The hermal swi ch is loca ed in he
rear of he oven. The face of he hermal
swi ch is in con ac wi h he oven liner.
The swi ch oggles closed if he oven
empera ure exceeds 212_F (100_C).
NOTE: The s eam cycle s ar swi ch is a moĆ
men ary swi ch loca ed on he fron
con rol panel.
When the steam duration potentiometer (17) is
set and the steam cycle start switch (18) is
pressed the single shot timer (6) is activated for
the duration of time on the steam duration poĆ
tentiometer. This allows the water solenoid
valve (19) to open spraying atomized water
onto the blower wheel. The steam light (20) is
illuminated during the humidaire cycle.
7. The convection fan (21) receives power from
the PDT blower switch (5). This switch deterĆ
mines hi and lo speed.
NOTE: Turn he mode selec or swi ch o cool
down o bypass he door microswi ch. This
allows he convec ion fan mo or o opera e
even when he doors are open.
NOTE: This oven may be conver ed from single o
hree phase, however, con ac ors mus be
changed due o he difference in amp
draw. Reference de ail inse in FIGURE 7.