R7999A1005 Fuel Air Controller by Honeywell
Product Introduction
The R7999A1005 belongs to Honeywell’s ControLinks series. This fuel air controller is specifically built to operate the ML7999 universal parallel positioning actuators. You can create modulation profiles with 7 to 24 points. Therefore, burner tuning becomes fast and accurate. Additionally, the device includes a remote reset input. This feature allows automated or offsite recovery without manual intervention. Furthermore, the unit operates in extreme ambient conditions from -40°F to 140°F. Consequently, it suits both indoor boiler rooms and outdoor enclosures.
Technical Specifications
Fuel-Air Profile Capabilities
The R7999A1005 supports independent fuel and air profiles. You can also add flue gas recirculation (FGR) profiles. Specifically, two independent fuel profiles are available with or without FGR. Each profile uses between 7 and 24 points. As a result, you achieve precise combustion tuning across the entire firing range.
Actuator Control and Behavior
This controller defines programmable actuator behaviors during purge and standby. Moreover, it includes independent lightoff and minimum modulation positions. The nonselected fuel actuator also has programmable behavior. Additionally, the automated actuator endpoint seeking process saves setup time. Therefore, installation and calibration become more efficient.
Inputs and Outputs
A multipurpose communications port allows PC or laptop connection for fast burner setup. The auto/manual input gives operators flexible control. Furthermore, the manual mode firing rate input enables direct modulation adjustments. The remote reset input accepts external signals to clear faults.
Safety and Protection Features
Integrated boiler shock protection algorithms are included. For instance, water temperature low fire hold prevents thermal shock. Stack temperature low fire hold adds another safety layer. Similarly, FGR and low fire hold protect the system during startup. You can also select FGR hold based on stack temperature. Additionally, the maximum modulation limit capability prevents overfiring. The R7999A1005 meets UL, FM, CSA, and CE approvals. It also complies with CSD-1 and NFPA standards.
Mechanical and Environmental Parameters
Power Requirements
The R7999A1005 operates on 100-120VAC at 50/60 Hz. Two global models cover worldwide applications. Consequently, wiring is straightforward in standard boiler rooms.
Ambient Conditions
This fuel air controller functions in -40°F to 140°F ambient temperatures. It also withstands 90% RH maximum non-condensing humidity. Therefore, you can install it in harsh industrial environments without concern.
Physical Design
The controller uses a pluggable design. It connects directly to a wiring subbase. This feature simplifies replacement and maintenance. Moreover, the field-configurable device adapts to various system requirements.
Frequently Asked Questions (FAQ)
1. Which actuators work with the R7999A1005?
The R7999A1005 is designed to control Honeywell ML7999 universal parallel positioning actuators exclusively.
2. How many profile points does this controller support?
You can configure between 7 and 24 points per fuel-air or FGR profile.
3. Can I use the remote reset input with a PLC?
Yes. The remote reset input accepts external dry contact signals from a PLC or push button.
4. What happens if the ambient temperature exceeds 140°F?
Operation above 140°F may cause unreliable performance. Install the controller in a ventilated enclosure.
5. Do I need a PC to program the R7999A1005?
A PC or laptop is strongly recommended for fast setup. However, some basic parameters can be configured manually.
