Tekmar 325 Zone Expansion Module Six Zone Valves

Product Description

The TEKMAR 325 is a six-zone expansion module designed to simplify wiring between tekmarNet+4 (tN4) thermostats and zone valves in hydronic heating systems. It draws power from an interconnected Zone Manager rather than requiring its own dedicated power supply, and its internal 24-volt, 8 VA transformer supplies connected tN4 thermostats and zone valves directly. Microprocessor PID control logic manages zone valve operation with precision. The 325 measures 3.625 inches H x 5.375 inches W x 0.5625 inches D and weighs 2.95 pounds. Installation is rated for indoor use only within an ambient temperature range of 32 to 122 degrees F. Licensed HVAC technicians working on hydronic zoning systems are the primary installers.

The 325 is used in residential and light-commercial hydronic heating applications where multiple zone valves must be controlled through tN4 thermostats. It fits into systems already using a TEKMAR Zone Manager, extending the zone count without adding a separate transformer. Typical installations include multi-zone hot-water baseboard or radiant floor systems where wiring consolidation and reliable zone valve sequencing are priorities. The module supports a combined relay load of 115 volts AC at 5 amps, 1/4 hp, with a pilot duty rating of 240 VA, making it suitable for controlling standard zone valve actuators across six zones.

Key Features

• Manages six zone valves via tN4 thermostats with simplified wiring architecture
• Internal 24-volt AC, 8 VA transformer powers connected tN4 thermostats and zone valves
• Power supplied by interconnected Zone Manager — no separate power supply required
• Microprocessor PID control for precise zone valve management
• Combined relay load rated at 115 volts AC, 5 amps, 1/4 hp, pilot duty 240 VA
• Certified to CSA C US and CSA/UL 61010-1; meets Class B ICES and FCC Part 15

Compatibility

Designed for use with TEKMAR tekmarNet+4 (tN4) thermostats and compatible zone valves in systems that include a TEKMAR Zone Manager providing the power supply to this module.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with hydronic zoning controls and low-voltage wiring. Shut down the Zone Manager and isolate all low-voltage circuits before making wiring connections to the 325. The unit is rated for indoor use only and must not be installed where ambient temperature, humidity, or altitude exceeds the listed ambient conditions. Refer to applicable local mechanical and electrical codes during installation.