Honeywell 7800 Series Manual page 7

120934 (3/4 INCH NPT)
FRONT SECTION OF
MOUNTING FLANGE
SCREW ONTO
SIGHT PIPE
SLOT (3)
FLANGE
SCREWS (3)
COVER
ROTATE DETECTOR
THIS WAY WHEN MOUNTING
M17948A
Fig. 5. Mounting CR7890 Integrated Burner Control.
Application
Line voltage wires
Ground Type
Earth Ground (CR7890)
NOTCH IN FACEPLATE
BACK SECTION OF
MOUNTING FLANGE
FACEPLATE
CAPTIVE COVER SCREW (4)
ROTATE
DETECTOR
THIS WAY TO
SEPARATE
MOUNTING
FLANGE
R
W E
P O
O T
P I L
E
A M
F L
I N
T
M A
S E
M
A R
R E
A L
REMOVABLE
FACEPLATE
FACEPLATE
SCREW (4)
Table 1. Recommended Wire Sizes and Part Numbers.
Recommended Wire Size
14, 16, or 18 AWG copper conductor, 600 volt insulation
wire.
Table 2. Recommended Grounding Practices.
1. Used to provide a connection between the CR7890 and the control panel of the
equipment. Earth ground must be capable of conducting enough current to blow
the 20A fast-blow fuse (or breaker) in the event of an internal short.
2. Use wide straps or brackets to provide minimum length, maximum surface area
ground conductors. If a leadwire is required, use 14 AWG copper wire.
3. Make sure that mechanically tightened joints along the ground path are free of
nonconductive coatings and protected against corrosion on mating surfaces.
CR7890B 7800 SERIES INTEGRATED BURNER CONTROL
Wiring
WARNING
Electrical Shock Hazard.
Can cause serious injury, death or property
damage.
Disconnect the power supply before wiring.
1. For proper wiring and sequence chart, refer to Fig. 7.
2. Disconnect the power supply from the main disconnect
before beginning installation to prevent electrical shock
and equipment damage. More than one disconnect can
be required.
3. All wiring must comply with all applicable electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC, Class 1 (Line Voltage)
wiring.
4. Use recommended wire routing of leadwires:
a. Do not run high voltage ignition transformer wires
with wires supplying the CR7890.
5. For recommended wire size and type, see Table 1.
6. For recommended grounding practices, see Table 2.
7. For high temperature installations, use
moisture-resistant 14 AWG wire selected for a
temperature rating above the maximum operating
temperature.
8. Refer to Fig. 9 through 16 for wiring connections.
9. Be sure loads do not exceed the terminal ratings. Refer
to the label on the CR7890 or to the terminal ratings in
Table 3.
Recommended Practice
7
Recommended Part Numbers
TTW60C, THW75C, THHN90C.
65-0259—1