The Belimo ZONE215N-35+ZONE120NC is a 1/2 in. NPT, 2-way on/off zone valve assembly: the ZONE215N-35 forged brass valve (Cv 3.5, 30 psi close-off, ANSI Class III 0.1% leakage) with the ZONE120NC normally closed spring return actuator for AC 120 V supply. The actuator draws 6.5 W in operation and connects by 6" wire leads.
Typically used on fan coil units, baseboards or other hydronic applications where fail-safe operation on 2-wire control is required, in hydronic systems with variable or constant flow. Designed to fit in compact areas where on/off control is required using 24 VAC or 120 VAC.
Specifications per Belimo ZONE215N-35 technical data sheet rev 2023-01-10; ZONE215N-35+ZONE120NC assembly data sheet rev 2022-01-12. Reviewed 2026-10-09.
Best For
- Fan coil units and baseboards
- Hydronic applications that need fail-safe operation on 2-wire control
- Variable or constant flow hydronic systems
- Chilled or hot water, up to 50% glycol, 32 to 212°F
- 2-wire thermostat on/off control at AC 120 V
Warranty
Belimo covers the valve and the ZONE120NC actuator with a 2-year warranty.
Key Features
2-way on/off zone valve
Cv 3.5, on/off flow characteristic, ANSI Class III 0.1% leakage.
30 psi close-off
Close-off pressure 30 psi with a 300 psi body pressure rating.
Spring return, normally closed
The ZONE120NC is a normally closed (NC) spring return actuator: 6.5 W in operation, transformer sizing 7 VA, 90° angle of rotation.
Manual override
Hand lever manual override with integrated mechanical position indication.
AC 120 V, 6" wire leads
AC 120 V 50/60 Hz supply, 6" wire leads; meets cULus requirements without an electrical ground connection.
Forged brass body
Forged brass valve body with 1/2" NPT female ends, stainless steel stem and EPDM seat.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
Valve: Belimo ZONE215N-35
| Valve size | 1/2" [DN 15] |
| Flow pattern | 2-way |
| Flow characteristic | on/off |
| Cv | 3.5 |
| Close-off pressure | 30 psi |
| Body pressure rating | 300 psi |
| Leakage rate | ANSI Class III 0.1% |
| Fluid | Chilled or hot water, up to 50% glycol |
| Fluid temperature range | 32 to 212°F [0 to 100°C] |
| Valve body | Forged brass |
| Stem | Stainless steel |
| Seat | EPDM |
| Housing seal | EPDM |
| Pipe connection | NPT female ends |
| Suitable actuators | Belimo ZONE spring return |
| Valve weight | 0.88 lb [0.40 kg] |
| Overall height with actuator (D) | 4.3" [110 mm] |
| Valve body length (B) | 2.8" [70 mm] |
| Actuator length (A) | 4.0" [102 mm] |
Actuator: Belimo ZONE120NC
| Nominal voltage | AC 120 V |
| Nominal voltage frequency | 50/60 Hz |
| Power consumption in operation | 6.5 W |
| Transformer sizing | 7 VA |
| Electrical connection | 6" wire leads |
| Control | On/off, spring return |
| Normal position | Normally closed (NC) |
| Manual override | Hand lever |
| Angle of rotation | 90° |
| Noise level, motor | 35 dB(A) |
| Noise level, fail-safe | 35 dB(A) |
| Position indication | Mechanical, integrated |
| Degree of protection IEC/EN | IP20 |
| Degree of protection NEMA/UL | NEMA 1 |
| Enclosure | UL Enclosure Type 1 |
| Agency listing | CE, cULus |
| Electrical ground | Meets cULus requirements without an electrical ground connection |
| Quality standard | ISO 9001 |
| Ambient temperature | 32 to 104°F [0 to 40°C] |
| Storage temperature | -40 to 176°F [-40 to 80°C] |
| Ambient humidity | Max. 95% RH, non-condensing |
| Servicing | Maintenance-free |
| Housing material | Galvanized steel |
Documentation
FAQ
What is the Cv and close-off pressure of the Belimo ZONE215N-35+ZONE120NC?
Cv 3.5 with 30 psi close-off pressure. Body pressure rating is 300 psi and leakage is ANSI Class III 0.1%.
What fluids and temperatures can the ZONE215N-35+ZONE120NC handle?
Chilled or hot water up to 50% glycol, with a fluid temperature range of 32 to 212°F [0 to 100°C].
Is the ZONE215N-35+ZONE120NC normally open or normally closed?
Normally Closed (NC). The ZONE120NC is an on/off spring return actuator.
What power does the ZONE215N-35+ZONE120NC actuator need?
AC 120 V, 50/60 Hz. Power consumption is 6.5 W in operation and transformer sizing is 7 VA.
Does the ZONE215N-35+ZONE120NC have a manual override?
Yes. The ZONE120NC has a hand lever manual override and integrated mechanical position indication.
- Valve Pattern:
- 2-Way
- Valve Size:
- 1/2 Inch
- Connection Type:
- NPT
- CV Rating:
- 3.5
- Actuator Type:
- Fail-Safe
- Voltage:
- 120VAC
- Control Signal:
- On/Off
- Auxillary Switch:
- None
