iWorx® SMZ1
505-048-2, Effective: March 10, 2015
3
© 2015 Taco Electronic Solutions, Inc.
SMZ1
The SMZ1 is a self-contained microprocessor-based controller for up to 4 snow melt zones.
Overview
The SMZ1 is a hydronic snow melt zone controller capable of regulating up to four zones. Each zone has two inputs:
one for slab temperature and one for a snow sensor. Temperature inputs are standard Precon III thermistors. The snow
sense inputs use standard dry-contact snow sensors, available from Taco. There are also Global Snow melt Enable
and Outside Air Temperature inputs. Each zone has a digital output and a modulating output suitable for valves or cir-
culators. There are also digital outputs for two Group Circulators, one Primary Circulator and Heat Demand.
The controller is based on LONWORKS® networking technology. The controller communicates with the BLM and HPM
series controllers over the network. The controller can also be networked to a higher-level control system for monitoring
and control applications.
Features
• Control of up to four snow melt zones with individual sensor inputs and isolated outputs
• Supports one 5-wire snow melt sensor
• Separate setpoints for idling and active snow melting
• Proportional plus integral (P+I) control
• Primary Pump output for a common pump or non-networked heat source
• Snow Melt Demand communicated to a BLM series boiler controller or HPM heat pump master controller
• Outdoor Air Cutoff temperature
• Configurable group circulators for assigning different heat sources to different groups of zones
• Automatic configuration with a Local Control Interface (LCI) touchscreen
• Alarm/Event Reporting
PURPOSE OF THIS GUIDE
The
iWorx® SMZ1 Application Guide
provides application information for the SMZ1 Controller.
The reader should understand basic HVAC concepts, intelligent environmental control automation, and basic L
ON-
W
ORKS
networking and communications. This Application Manual is written for:
• Users who engineer control logic
• Users who set up hardware configuration
• Users who change hardware or control logic
• Technicians and field engineers
REPRESENTATIONS AND WARRANTIES
This Document is subject to change from time to time at the sole discretion of Taco Electronic Solutions, Inc. All
updates to the Document are available at www.taco-hvac.com. When installing this product, it is the reader’s responsi-
bility to ensure that the latest version of the Document is being used.
iWorx® products shall only be used for the applications identified in the product specifications and for no other pur-
poses. For example, iWorx® products are not intended for use to support fire suppression systems, life support sys-
tems, critical care applications, commercial aviation, nuclear facilities or any other applications where product failure
could lead to injury to person, loss of life, or catastrophic property damage and should not be used for such purposes.
