Reznor Maxitrol Amplifier Replacement Kit Installation
For Indirect-Fired Duct Furnaces - Units with Electronic Modulation Option AG7, AG8, AG9, or AG9H
Brand: Reznor
Model Series: AG7, AG8, AG9, AG9H
Kit Part Numbers: 262320, 262321
Revision: OPT-AG7,8,9,9H (01-22)
Supersedes: CP-AG7/8/9 Amplifier Kits (01-16) PN262319R3
Introduction
This document provides instructions for installing the Maxitrol Amplifier Replacement Kit for Reznor indirect-fired duct furnaces equipped with electronic modulation options AG7, AG8, AG9, or AG9H. The replacement amplifier functions identically to the original. Note that wire connections may differ when replacing an older amplifier.
Image Description: Figure 1 shows a Maxitrol amplifier module, a rectangular electronic component with branding.
Safety and Preparation
Refer to the installation manual provided with the heater for important safety information.
Ensure 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 Procedure
- Turn OFF gas and electric power.
- Open cabinet and mark and disconnect wires from the amplifier being replaced. Remove the amplifier.
- Install the replacement amplifier and secure using supplied screws.
- Reconnect wires to the replacement amplifier as follows:
- 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.
- Reconnect wires as marked.
- If installing amplifier PN 260863 on unit with option AG7, remove R55 resistor between T5 and T7.
- For units with amplifier PN 48035, 48036, 48037, or 48038, refer to instructions in Table 2.
- 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.
- Close cabinet.
- Turn ON electric power and gas.
- Check for proper operation.
Table 2: Replacement Amplifier Wiring Instructions
| Option | Figure Reference | Step |
|---|---|---|
| AG7 | Figure 2, DETAIL A |
|
| AG8 | Figure 2, DETAIL B |
|
| AG9, AG9H | Figure 2, DETAIL C |
|
Figure 2: Replacement Amplifier Wiring Diagrams Description
The following describes the wiring connections shown in Figure 2, distinguishing between original and replacement amplifiers for each option.
Detail A: Wiring for Option AG7
Original Amplifier (Models A1010B P/N 48035, A1011B P/N 48036): Depicts terminal connections (T1, T2, T3, T4, T5, T7, T8, T9, T10, T11) with associated wires (BL, BK, BR, W, G, PR, R). Includes a "TEMPERATURE SETTING DIAL" indicator.
Replacement Amplifier (Model A1010U P/N 260863): Shows similar terminal layout. Key instructions:
- A new blue wire from the kit is used.
- When replacing models 48035 or 48036, connect this new blue wire to terminal T10.
- Connect the other end of this new blue wire to the same terminal block where the blue wire from T9 is connected.
- Important: Remove the R55 resistor located between terminals T5 and T7.
Detail B: Wiring for Option AG8
Original Amplifier (Models A1010F P/N 48037, A1011F P/N 48038): Depicts terminal connections (T1, T2, T3, T4, T9, T10, T11, T14) with associated wires (BL, R, BK, BR, W, PR). Includes a "TEMPERATURE SETTING DIAL" indicator.
Replacement Amplifier (Model AD1010U P/N 260864): Shows similar terminal layout. Key instructions:
- A new blue wire from the kit is used.
- When replacing models 48037 or 48038, connect this new blue wire to terminal T10.
- Connect the other end of this new blue wire to the same terminal block where the blue wire from T9 is connected.
- Note for specific models: If two orange wires were connected to T3 on the original amplifier, cut and splice these wires before connecting them to the new amplifier. A twist-on wire connector is supplied in the field.
Detail C: Wiring for Option AG9(H)
Original Amplifier (Models A1010B P/N 48035, A1011B P/N 48036): Depicts terminal connections identical to the AG7 original amplifier.
Replacement Amplifier (Model A1010U P/N 260863): Depicts terminal connections identical to the AG7 replacement amplifier. Key instructions:
- A new blue wire from the kit is used.
- When replacing models 48035 or 48036, connect this new blue wire to terminal T10.
- Connect the other end of this new blue wire to the same terminal block where the blue wire from T9 is connected.
- Note for specific models: If two orange wires were connected to T3 on the original amplifier, cut and splice these wires before connecting them to the new amplifier. A twist-on wire connector is supplied in the field.
Final Steps
- Close cabinet.
- Turn ON electric power and gas.
- Check for proper operation.
Notes and Disclaimer
Keep this manual for future reference.
Specifications and illustrations are subject to change without notice or incurring obligations. The latest version of this manual is available at www.reznorhvac.com.
©2022 Nortek Global HVAC LLC, O'Fallon, MO. All rights reserved.
