SC Series
Signal Conditioners
For use with Selectra Modulating Valves
Maxitrol’s track mounted signal conditioners and M/MR valves can be configured for direct or indirect fired gas applications. They may be field installed on existing equipment or specified for new equipment.
| Model | Input |
| SC11‑A | 4–20 mA input |
| SC11‑V | 0–10 VDC input |
| SC11‑B | 4–20 mA or 0–10 VDC input (Replaces SC10-A6S2, SC10-V6S2, SC10-B6S1) |
| SC11‑S | 4–20 mA or 0–10 VDC input with Adjustable Low Fire Start Timer |
| SC25S | 4–20 mA or 0–10 VDC input with Min and Max Discharge Air Temp Limits and Adjustable Low Fire Start Timer Option (Replaces SC20C-B6S2) |
| SC30 | 0–10 VDC input for Indirect Fired Gas Applications using 2‑Speed Inducers and 2‑Stage Gas Valves |
| SC30-SM2 | 0–10, 2–10 VDC or 0–20, 4–20 mA |
| D‑SC1 | 0–5, 1–5, 0–10 VDC or 1–20, 4–20 mA |
For use with Selectra Modulating Valves
Maxitrol’s track mounted signal conditioners and M/MR valves can be configured for direct or indirect fired gas applications. They may be field installed on existing equipment or specified for new equipment.
| Model | Input |
| SC11‑A | 4–20 mA input |
| SC11‑V | 0–10 VDC input |
| SC11‑B | 4–20 mA or 0–10 VDC input (Replaces SC10-A6S2, SC10-V6S2, SC10-B6S1) |
| SC11‑S | 4–20 mA or 0–10 VDC input with Adjustable Low Fire Start Timer |
| SC25S | 4–20 mA or 0–10 VDC input with Min and Max Discharge Air Temp Limits and Adjustable Low Fire Start Timer Option (Replaces SC20C-B6S2) |
| SC30 | 0–10 VDC input for Indirect Fired Gas Applications using 2‑Speed Inducers and 2‑Stage Gas Valves |
| SC30-SM2 | 0–10, 2–10 VDC or 0–20, 4–20 mA |
| D‑SC1 | 0–5, 1–5, 0–10 VDC or 1–20, 4–20 mA |
For use with EXA Modulating Valves
The SC40 Series signal conditioner, used with the E42H, E52H, and E62H Series modulating gas valves, is designed to modulate atmospheric indirect fired heaters with a 2‑speed inducer. Most applications are able to achieve approximately a 5:1 turndown. The system is easily integrated into existing heater designs. The system’s reliability and simplicity greatly reduce the engineering time required to bring a high turndown modulating heater to market.
The SC40-SM2 Series signal conditioner, used with the E42, E52, E62 Series modulating gas valves, is designed to modulate atmospheric indirect fired heaters that have a sectioned gas manifold and 2‑speed inducer. The sectioned — or split — manifold design operators as two independent manifolds sharing a single 2‑speed inducer. One manifold section is fully modulating, and the other section operates as a 2‑stage. Typical applications achieve a turndown of approximately 10:1.
| Model | Input |
| SC40 | 0–10, 2–10 VDC or 0–20, 4–20 mA |
| SC40-SM2 | 0–10, 2–10 VDC or 0–20, 4–20 mA |
For use with EXA Modulating Valves
The SC40 Series signal conditioner, used with the E42H, E52H, and E62H Series modulating gas valves, is designed to modulate atmospheric indirect fired heaters with a 2‑speed inducer. Most applications are able to achieve approximately a 5:1 turndown. The system is easily integrated into existing heater designs. The system’s reliability and simplicity greatly reduce the engineering time required to bring a high turndown modulating heater to market.
The SC40-SM2 Series signal conditioner, used with the E42, E52, E62 Series modulating gas valves, is designed to modulate atmospheric indirect fired heaters that have a sectioned gas manifold and 2‑speed inducer. The sectioned — or split — manifold design operators as two independent manifolds sharing a single 2‑speed inducer. One manifold section is fully modulating, and the other section operates as a 2‑stage. Typical applications achieve a turndown of approximately 10:1.
| Model | Input |
| SC40 | 0–10, 2–10 VDC or 0–20, 4–20 mA |
| SC40-SM2 | 0–10, 2–10 VDC or 0–20, 4–20 mA |
| Title | Description | Version | Download |
|---|---|---|---|
| SC11 Signal Conditioners | Installation Instructions; For direct or indirect fired applications. Drives multiple Selectra valves simultaneously. | 🇺🇸 SC11_OEM_MS_EN_11.2017 | DownloadPreview |
| SC11 & SC25S Signal Conditioner | Installation Instructions; Analog signal conditioners convert selectable 0-10 VDC or 4-20 mA control signal to an output level capable of driving one or more Selectra valves. | 🇺🇸 SC11S_25S_MS_EN_11.2017 | DownloadPreview |
| SC30 Signal Conditioner | Installation Instrucitons; Converts a selectable 0-10 VDC to a 0-20 VDC signal capable of driving a Selectra valve. | 🇺🇸 SC30_MS_EN_09.2012 | DownloadPreview |
| SC30-SM2 Signal Conditioner | Installation Instructions; Used with M420, M520, M620 on atmospheric indirect fired heaters w/sectioned manifold & 2-speed inducer. | 🇺🇸 SC30-SM2_MS_EN_12.2020 | DownloadPreview |
| SC40 Series Signal Conditioner | Installation Instructions; Used with E42H, E52H, E62H series modulating valves. Designed for modulate atmospheric indirect fired heaters with 2-speed inducer. | 🇺🇸 SC40_MS_EN_12.2020 | DownloadPreview |
| SC40-SM2 Series Signal Conditioner | Installation Instructions; Used with E42, E52, E62 Series modulating vavles. Designed to modulate atmospheric indirect fired heaters with sectioned manifold & 2-speed inducer. | 🇺🇸 SC40_SM2_MS_EN_10.2020 | DownloadPreview |