The Belimo ZONE215S-35+ZONE24NC-S is a 1/2-inch two-way sweat zone valve assembly that pairs the ZONE215S-35 forged brass valve (Cv 3.5, 30 psi close-off) with the ZONE24NC-S AC 24 V spring return on/off actuator. It is normally closed and includes one built-in SPST auxiliary switch.
Forged brass body, stainless steel stem and EPDM seat, with a 300 psi body pressure rating and ANSI Class III 0.1% leakage, for chilled or hot water up to 50% glycol.
Specifications verified October 2026 against Belimo technical data sheets ZONE215S-35 (rev. 2023-01-10) and ZONE215S-35+ZONE24NC-S (valve and ZONE24NC-S pages rev. 2022-01-12).
Best For
- Fan coil units and baseboards
- Hydronic zones that need fail-safe operation on 2-wire control
- Variable flow or constant flow hydronic systems
- Compact installations with limited space
- Chilled or hot water service with up to 50% glycol
Warranty
Both the valve and the actuator carry a 2-year Belimo warranty.
Key Features
Fail-Safe Spring Return
Spring return ZONE24NC-S actuator for 2-wire on/off control, normally closed, AC 24 V.
Close-Off and Body Rating
30 psi close-off pressure with a 300 psi body pressure rating and Cv 3.5.
Built-In Auxiliary Switch
One SPST auxiliary switch rated 0.4 A resistive (0.4 A inductive) @ AC 24 V.
Manual Override
Hand lever manual override with integrated mechanical position indication.
Brass Body, EPDM Seat
Forged brass valve body, stainless steel stem, EPDM seat and housing seal.
Listed and Certified
cULus listed and CE marked actuator, manufactured under ISO 9001.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
| Valve Model | ZONE215S-35 |
|---|---|
| Valve Size | 1/2 in. [DN 15] |
| Pipe Connection | Sweat |
| Flow Pattern | 2-way |
| Cv | 3.5 |
| Close-Off Pressure | 30 psi |
| Body Pressure Rating | 300 psi |
| Flow Characteristic | On/off |
| Leakage Rate | ANSI Class III 0.1% |
| Fluid | Chilled or hot water, up to 50% glycol |
| Fluid Temperature Range | 32...212°F [0...100°C] |
| Valve Body | Forged brass |
| Housing Seal | EPDM |
| Stem | Stainless steel |
| Seat | EPDM |
| Suitable Actuators | Belimo ZONE spring return actuators |
| Valve Weight | 0.88 lb [0.40 kg] |
| Actuator Model | ZONE24NC-S |
|---|---|
| Actuator Type | Spring return, fail-safe |
| Normal Position | Normally Closed |
| Control | On/off, 2-wire |
| Nominal Voltage | AC 24 V |
| Nominal Voltage Frequency | 50/60 Hz |
| Power Consumption in Operation | 6.5 W |
| Transformer Sizing | 7 VA (class 2 power source) |
| Auxiliary Switch | 1 x SPST, 0.4 A resistive (0.4 A inductive) @ AC 24 V |
| Lead Colors | Black (power), red (auxiliary switch) |
| Electrical Connection | 18 in. wire leads |
| 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 |
| Quality Standard | ISO 9001 |
| Ambient Temperature | 32...104°F [0...40°C] |
| Storage Temperature | -40...176°F [-40...80°C] |
| Ambient Humidity | Max. 95% RH, non-condensing |
| Servicing | Maintenance-free |
| Housing Material | Galvanized steel |
| A (actuator width) | 4.0 in. [102 mm] |
|---|---|
| B (valve end to end) | 2.8 in. [70 mm] |
| C (pipe centerline to top) | 3.5 in. [89 mm] |
| D (overall height) | 4.3 in. [110 mm] |
| E / F (centerline to side) | 1.2 in. [30 mm] / 1.2 in. [31 mm] |
Documentation
Frequently Asked Questions
What is the Cv and close-off pressure of the Belimo ZONE215S-35+ZONE24NC-S?
The ZONE215S-35+ZONE24NC-S has a Cv of 3.5 and a close-off pressure of 30 psi. The valve body is rated for 300 psi.
Is the Belimo ZONE215S-35+ZONE24NC-S normally open or normally closed?
The ZONE215S-35+ZONE24NC-S is normally closed. It uses the ZONE24NC-S fail-safe spring return actuator for 2-wire on/off control.
What power does the ZONE24NC-S actuator require?
The ZONE24NC-S runs on AC 24 V, 50/60 Hz. It draws 6.5 W in operation with 7 VA transformer sizing (class 2 power source).
Does the Belimo ZONE215S-35+ZONE24NC-S have an auxiliary switch?
Yes. The ZONE24NC-S has one built-in SPST auxiliary switch rated 0.4 A resistive (0.4 A inductive) @ AC 24 V.
Does the Belimo ZONE215S-35+ZONE24NC-S have a manual override?
Yes. The ZONE24NC-S actuator has a hand lever manual override.
What pipe connection does the Belimo ZONE215S-35+ZONE24NC-S use?
The ZONE215S-35+ZONE24NC-S has 1/2 in. [DN 15] sweat connections in a 2-way pattern.
What fluids and temperatures can the Belimo ZONE215S-35+ZONE24NC-S handle?
The ZONE215S-35+ZONE24NC-S handles chilled or hot water with up to 50% glycol at fluid temperatures from 32 to 212°F [0 to 100°C].
What warranty comes with the Belimo ZONE215S-35+ZONE24NC-S?
The ZONE215S-35+ZONE24NC-S carries a 2-year Belimo warranty.
- Valve Pattern:
- 2-Way
- Valve Size:
- 1/2 Inch
- Connection Type:
- Sweat
- CV Rating:
- 3.5
- Max Close-Off Pressure:
- 30 psi
- Max Operating Pressure:
- 300 psi
- Medium Temperature Range:
- 32-212 °F
- Body Material:
- Forged Brass
- Actuator Type:
- Fail-Safe
- Fail-Safe Position:
- Fail Closed
- Voltage:
- 24VAC
- Control Signal:
- On/Off
- Auxillary Switch:
- (1) SPST 0.4A @ 24VAC
- Power Connection:
- Wire Leads
