422 | Universal Reset Mofule - Two tN4, Mixing, Boiler, DHW & Setpoint | Tekmar
Documents and manuals
Tekmar 422 Documents
Overview
Details for 422
Universal Reset Mofule - Two tN4, Mixing, Boiler, DHW & Setpoint
The Universal Reset Module 422 is designed to operate all of the mechanical equipment in a hydronic heating system, except for zones, coordinating their operation through network communication. It can be used in applications ranging from a single zone of baseboard with an on/off boiler to multiple fan coils, mixed radiant floor zones, and a modulating/condensing boiler. This control regulates up to two heating water temperatures through Outdoor Temperature Reset and Indoor Temperature Feedback. It is capable of controlling a single on/off, two stage, or modulating boiler, a mixing device, Domestic Hot Water, setpoint loads, and can expand up to 24 zones in total for each heating water temperature.
Features
- DHW priority (optional), expandable up to 48 zones
- Boiler protection, powered pump outputs
- Warm weather shut down, zone synchronization
- Single on/off or modulating boiler control, variable speed, or floating action mixing control
- Outdoor temperature reset, indoor temperature feedback
- System setback (with optional Timer)
- One touch overrides (with optional User Switch)
- Automatic boiler differential, Exercising
- DHW post purge, DHW control
Specifications
| Item Number | 422 |
| Brand | Tekmar |
| Category | tekmarNet Controls |
| Agency Approvals | CSA C US, CSA/UL 61010-1, meets Class B: ICES & FCC Part 15 |
| Ambient Conditions | Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), Max. RH 92 percent for temperatures up to 40 degrees C, 50 percent RH at greater than 40 degrees C, Altitude less than 6560 feet (2000 m), Installation Category II, Pollution Degree 2 |
| Boiler Relay | 115 V (ac) 5 A |
| Combined Load | 10 A Max. (for DHW, Primary, Mixing & Var. Speed Pump) |
| Control Type | Microprocessor PID control, this is not a safety (limit) control |
| Demand | 20-260 V (ac) / 0.1 VA at 24 V |
| Dimensions | 3-5/8" H x 5-3/8" W x 9/16" D (92 x 137 x 14 mm) |
| Enclosure Material | Does Not Apply To Product |
| Enclosure NEMA Rating | Does Not Apply To Product |
| Floating Action Load | 24 V (ac) 8 VA Maximum |
| Hydronic - HVAC Control Type | Universal Reset Module |
| Modulating Output | 0-10 V (dc) Minimum 2500 |
| Power Supply | Provided by interconnected tekmarNet Zone Manager |
| Pump Relay | 115 V (ac) 5 A, 1/6 hp |
| Sensor | NTC thermistor, 10k at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta=3892 |
| Variable Pump | 115 V (ac) 2.5 A, fuse T2.5 A 250 V |
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