TurboChef HhB Comparison Outline page 3

Service Differences
Detailed servicing instructions are provided in the HhB and
HhB 2 service manuals.
Notable Part Location Changes
The smart card reader, high-limit thermostat, rack motor,
and fuses were relocated for easier serviceability and/or more
efficient oven operation/installation (Figures 4-12).
Multiple Fuse Configurations
The fuses on the original HhB oven were located on the back
panel. The HhB 2 oven fuses are located on a fuse block
behind the right-side panel and can be field-configured for
single or multiphase operation. See Figures 7 and 8, below.
Figure 7: Original HhB Fuse Location
Figure 8: HhB 2 Fuse Location
Fuses in positions 2
and 4 for single
phase operation.
Note: Fuses are
moved to positions 3
and 4 for multiphase
Wye, and to positions
1 and 2 for multi-
phase Delta.
Power cord
HhB/HhB 2 Comparison Outline
Door Hinges
The hinges on the original HhB oven were secured to the
oven door, allowing for door removal during deep cleaning.
The hinges on the HhB 2 oven are secured to the oven
frame, and the right-side hinge actuates the door switch for
improved reliability. See Figures 9 and 10, below.
Door Switch
The door switch on the original HhB oven was either a
magnet or plunger-style switch, depending on the date of
manufacture. The original HhB switch (regardless of type)
was actuated by the door itself. The door switch on the HhB
2 is a paddle-style switch that is actuated by the right-side
hinge, improving the detection of the door position. See
Figure 10, below.
Hooks into frame
Figure 9: Original HhB Hinge
Figure 10: HhB 2 Hinge and Switch
Paddle-style switch
Switch actuated
by hinge
Hinge assembly
DOC-1201 (A) / Page 3 of 5