| Installer friendly - Ample room for terminations, large screw terminals, automatic resettable fuse, snap-in transformers |
| Application versatility - 3 selectable 120 VAC auxiliary switches for enabling pumps and boilers, dedicated pump outputs, unlimited zone expansion |
| Extremely reliable design - Clutch-protected drive train, durable synchronous motor, millions installed in North America |
| Compact design with snap-on actuator with a convenient in-line push button, removable bottom cap allows for easy in-pipe service |
| Application versatility - Hot water, chilled water and low-pressure steam |
| Compatible with 2, 3 and 4-wire thermostats or other low voltage controllers with switching action |
| Heavy duty, sealed relays |
| 3 pump outputs (120 VAC/5 A) and 3 to 6 (model dependent) zone valve outputs (24 V) |
| Zone priority selectable with 1 hr time-out feature |
| Convenient R, W, C and T, T, COM dual labeling at thermostat terminals |
| System pump status (on/off) during priority selectable |
| Dry contacts (XX,AUX, ZONE 1 E/S) capable of switching line voltage |
| Replaceable, snap-fit 40 VA transformer on 3 and 4 zone models, expandable to 80 VA with 2nd transformer |
| Two replaceable, snap-fit 40 VA transformers (80 VA) on 6 zone models |
| Automatic resettable fuse on 24 V circuit |
| Expandable to unlimited number of zones using simple 3-wire connection between controls |
| Large screw terminals for ease of wiring on-board ground terminals |
| Front panel LED indicator light for functional status |