REZNOR CP-AG7 Maxitrol Amplifier Replacement Kit Instruction Manual

REZNOR CP-AG7 Maxitrol Amplifier Replacement Kit

UNITS WITH ELECTRONIC MODULATION OPTION AG7, AG8, AG9, OR AG9H

• The replacement amplifier (see Figure 1) functions the same as the original, but when replacing an older amplifier, there is a difference in wire connections.

• Refer to the installation manual provided with the heater for important safety information.

• Ensure that all components listed in Table 1 are available before beginning installation.

Table 1. Amplifier Replacement Kit Components

Kit PN| Replaces (PN)| Option| Component| Component PN (Quantity)
262320| 48035, 48036, 260863| AG7, AG9, AG9H| Amplifier| 260863 (1)
Blue wire| 159289 (1)
Wire terminal| 142860 (9)
262321| 48037, 48038, 260864| AG8| Amplifier| 260864 (1)
Blue wire| 159289 (1)
Wire terminal| 142860 (9)

INSTALLATION

1. Turn OFF gas and electric power.

2. Open cabinet and mark and disconnect wires from amplifier being replaced. Remove amplifier.

3. Install replacement amplifier and secure using supplied screws.

4. Reconnect wires to replacement amplifier as follows:
   a. For units with amplifier PN 260863 or 260864, wire connections do not change.
   NOTE: The blue wire and the terminals in the kit are not used.

5. Reconnect wires as marked.

6. If installing amplifier PN 260863 on unit with option AG7, remove R55 resistor between T5 and T7.
   b. For units with amplifier PN 48035, 48036, 48037, or 48038, refer to instructions in Table 2.

Table 2. Replacement Amplifier Wiring Instructions

Option| Figure Reference| Step
AG7| Figure 2 , DETAIL A|

  1. Remove R55 resistor between T5 and T7.
  2. Connect wire terminal to each of nine wires and connect wires to replacement amplifier (PN 260863).
  3. Connect one end of new blue wire to T10 and other end to terminal block with blue wire from T9.  

AG8| Figure 2 , DETAIL B|

  1. If there are two orange wires connected to T3, cut and splice wires before connecting wire terminals.
  2. Connect wire terminal to each wire and connect to eight terminals on replacement amplifier (PN 260864).
  3. Connect one end of new blue wire to T10 and other end to terminal block with blue wire from T9.  

AG9, AG9H| Figure 2 , DETAIL C|

  1. If there are two orange wires connected to T3, cut and splice wires before connecting wire terminals.
  2. Connect wire terminal to each wire and connect to eight terminals on replacement amplifier (PN 260863).
  3. Connect one end of new blue wire to T10 and other end to terminal block with blue wire from T9.  

NOTE: Unused terminals are not shown in Figure 2.

DETAIL A|

Wiring for Option AG7 Original Amplifier

---|---

Wiring for Option AG7 Replacement Amplifier
When replacing 48035 or 48036, connect the new blue wire to T10 and connect the other end to the same terminal block as the blue wire from T9 is connected.

DETAIL B|

Wiring for Option AG8 Original Amplifier

Wiring for Option AG8 Replacement Amplifier

• When replacing 48037 or 48038, connect the new blue wire to T10 and connect the other end to the same terminal block as the blue wire from T9 is connected.
  ** Some models will have two orange wires that were connected to T3. If there are two wires to connect to T3, cut and splice the wires prior to connecting to the new amplifier. (Twist-on wire connector is field supplied.)

DETAIL C|

Wiring for Option AG9(H) Original Amplifier

Wiring for Option AG9(H) Replacement Amplifier

• When replacing 48035 or 48036, connect the new blue wire to T10 and connect the other end to the same terminal block as the blue wire from T9 is connected.
  ** Some models will have two orange wires that were connected to T3. If there are two wires to connect to T3, cut and splice the wires prior to connecting to the new amplifier. (Twist-on wire connector is field supplied.)

  5. Close cabinet.
  6. Turn ON electric power and gas.
  7. Check for proper operation.

NOTE: Keep this manual for future reference.

Customer Support

Specifications and illustrations subject to change without notice or incurring obligations.
Latest version of this manual is available at www.reznorhvac.com.
©2022 Nortek Global HVAC LLC, O’Fallon, MO. All rights reserved.
OPT-AG7,8,9,9H (01-22) 262319-A

References

• Reznor HVAC

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