Part Number: R8001L8001 (Model: R8001 Series Aquastat Relay)
Alternate P/N: N/A (Direct Replacement for Honeywell R8001L Series Aquastats)
Brand: Honeywell (Building Technologies & Controls Division)
Product Category: Aquastat Relay (Temperature Sensing & Control Relay)
Product Series: Honeywell R8001 Series (Hydronic Heating System Controls)
Core Application: Specifically designed for temperature control and monitoring in hydronic heating systems, including boilers, water heaters, and radiant heating systems. It functions as a combination of temperature sensor, control relay, and safety switch, ensuring precise water temperature regulation and system protection. Widely applied in residential, commercial, and light industrial buildings.
Core Features: Built-in temperature sensing element; adjustable setpoint and differential; multiple relay contacts for control and alarm functions; compact design for panel or wall mounting; rugged construction for long-term reliability; compatibility with standard hydronic system components.
2. Electrical Specifications
Supply Voltage: 120V AC, 60Hz (nominal); voltage tolerance: ±10% (108V AC ~ 132V AC); power consumption: ≤5VA (typical operating condition).
Relay Contacts: 2 SPDT (Single Pole Double Throw) relay contacts; contact rating: 10A at 120/240V AC (resistive load), 5A at 120/240V AC (inductive load); contact material: Silver cadmium oxide for low contact resistance and long life.
Temperature Sensing: Built-in immersion temperature probe; sensor type: Bimetallic element; temperature range: 100°F ~ 240°F (38°C ~ 116°C); setpoint adjustment: Manual adjustment via front-mounted dial; differential adjustment: 5°F ~ 30°F (3°C ~ 17°C) adjustable.
Control Logic: High-temperature cutout (HTCO) function; automatic reset after temperature drops below set differential; normally open/normally closed contact configuration selectable via wiring.
Protection Functions: Over-temperature protection (fixed cutout at 240°F / 116°C); contact bounce suppression; overload protection for relay coils; surge protection up to 2500V AC (transient voltage).
Response Time: Temperature response time: ≤30 seconds (for 10°F / 6°C temperature change); relay contact response time: ≤100ms.
Insulation Resistance: ≥100MΩ at 500V DC (between contacts and ground); isolation voltage: 1500V AC (1 minute) between live parts and enclosure.
