PART NO. 37-7750001
1922
emerson.com/white-rodgers
Ignitor Adapter Harness (use to connect
new nitride ignitor with old carbide
furnace connector)
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL
INJURY AND/OR PROPERTY DAMAGE.
PARTS INCLUDED
• 1 – 789A-751A1 Hot Surface Ignitor
• 1 – Ignitor Mounting Bracket
• 2 – ½” Sheet Metal Mounting Screws
• 1 – Ignitor Adapter Harness
• 1 – Installation Instructions
DESCRIPTION
The 789A-751KT2 is an aftermarket direct
replacement Hot Surface Ignitor Kit. This kit can be
utilized to replace a Silicon Carbide Ignitor (Carrier
model LH33ZS001 or valid cross reference) with
Silicon Nitride on 40” Carrier/ICP Brand mid-
efficiency furnaces.
SPECIFICATIONS
Rated Voltage:
120 volts + 10%, -15%, 50/60 Hz.
Cold Resistance:
20 to 100 ohms
Current:
0.4 to 1.2 amps at 120 ± 1.0 volts
Time to 1796 °F (980 °C):
8 seconds maximum at 102 ± 1.0 volts
Ignitor Life:
100,000 cycles at 120 volts under typical
conditions
Agency:
CSA Certified
Note: Internal wires to ignitor connections to withstand
operational temperature of 482 °F (250 °C)
789A-751A1 Hot Surface Ignitor
789A-751KT2
OEM Direct Replacement 120V
Hot Surface Ignitor
INSTALLATION INSTRUCTIONS
Ignitor mounting bracket
Emerson and White-Rodgers are
trademarks of Emerson Electric Co.
©2019 Emerson Electric Co.
All rights reserved.
emerson.com/white-rodgers
INSTALLATION
NOTE: Install all wiring according to local and national electrical codes and ordinances
1. Disconnect electrical power.
2. Disconnect wires from gas valve, flame sensor and
hot surface ignitor.
3. Locate old ignitor and remove the screw that
secures old ignitor mounting bracket to the burner
assembly.
a. Note: some applications may require the
burner assembly to be removed first.
b. Take note of location of old ignitor.
4. Remove old ignitor mounting bracket from burner
assembly.
5. Attach new ignitor to new ignitor mounting bracket,
screwing into the ignitor bracket hole (Fig. 1 & 2)
using one of two screws provided.
a. See Fig. 3 for correct assembly orientation.
6. Install new ignitor and mounting bracket assembly
in same location as noted in 3b.
7. Secure new ignitor mounting bracket to the burner
assembly by placing the remaining screw through
the correct ignitor mounting bracket hole (Fig. 2).
a. The use of hole #1 or hole #2 will depend on
burner assembly
i. See Fig. 5 for correct location of ignitor
blade on flame side
8. Verify ignitor is in the correct position (see Fig. 5
and 6).
9. Re-attach burner assembly if necessary.
10. Use adapter harness to connect new nitride ignitor
to furnace control board harness.
Ignitor
bracket
hole
Fig. 1: New
ignitor –
789A-751A1
Ignitor
mounting
bracket
hole #1
Ignitor
mounting
bracket
hole #2
Ignitor bracket
hole
Fig. 2: New ignitor
mounting bracket
Fig. 3: New
ignitor and
mounting
bracket
assembly
Fig. 4: New ignitor and mounting
bracket installed into burner
assembly
Bottom burner
support
Ignitor mounting bracket
789A-751A1
Ignitor
Fig. 6: Gas-side view of ignitor in correct position
Burner #3
Burner #2
Burner #1
Ignitor mounting
bracket
Bottom
burner
support
Top burner
support
Fig. 5: Flame-side view of ignitor in correct position
TECHNICAL SUPPORT: 1-888-725-9797