421
Discontinued - Replaced By: 422
Part of the Boiler and Mixing Controls Series
Ordering Code: 421
UPC: 779655042101
421 Mixing Reset Module
The Mixing Reset Module 421 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 mixed radiant with an on/off boiler to multiple radiant floor zones with an on/off boiler. This control regulates one mixed heating water temperature through outdoor temperature reset and indoor temperature feedback. It is capable of controlling a single on/off boiler, floating action or variable speed injection mixing, and can expand up to 24 zones in total. Replacement option: 422.
Features
- Outdoor temperature reset, indoor Temperature Feedback
- Warm weather shut down, zone synchronization
- Expandable up to 24 zones, single on /off boiler control
- Variable speed, or floating action mixing control, automatic boiler differential
| Specifications | |
|---|---|
| Agency Approvals | CSA C US, meets Class B: ICES & FCC Part 15 |
| Ambient Conditions | Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), RH less than or equal to 80 percent to 88 degrees F (31 degrees C), down to 50 percent above 104 degrees F (40 degrees C), Altitude less than 6560 ft. (2000 m), Installation Category II, Pollution Degree |
| Combined Load | 7.5 A max (System and Variable Speed Pump) |
| Control Type | Microprocessor control, this is not a safety (limit) control |
| Demand | 20 to 260 V (ac) / 0.1 VA at 24 V |
| Dimensions | 3 5/8 IN H x 5 3/8 IN W x 9/16 IN D (92 x 137 x 14 MM) |
| Enclosure Material | Does Not Apply To Product |
| Enclosure NEMA Rating | Does Not Apply To Product |
| Floating Action Output | 24 V (ac) 8 VA max |
| Hydronic - HVAC Control Type | Mixing Reset Module |
| Power Supply | Provided by interconnected tekmarNet Zone Manager |
| Pump Relay | 115 V (ac) 5 A, 1/6 hp |
| Sensor | NTC thermistor, 10 k ohms 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 |