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Environmental Technology FWT-3H Installation And Operating Instructions

Hydronic thermostat

FWT

- 3H Hydronic Thermostat

(Order Number 19090)

We Manage Heat®

Installation And Operating Instructions

Environmental Technology, Inc.

1850 N Sheridan Street

South Bend, Indiana 46628

(800) 234-4239

FAX (888) 234-4238

I T

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9 0

2 rev A

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May 2008

Table of Contents

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Page 1 - 3H Hydronic Thermostat ® (Order Number 19090) We Manage Heat® Installation And Operating Instructions Environmental Technology, Inc. 1850 N Sheridan Street South Bend, Indiana 46628 (800) 234-4239 FAX (888) 234-4238 2 rev A May 2008...
Page 2 The cable length can be shortened if the entire 20 feet is not needed for the chosen mounting location. Shortening the cable will not affect performance of the FWT-3H. Locate the temperature sensor within the heated space as shown in Figure 1. Do not allow the temperature sensor or extension cable to cross over or come in contact with any heating source such as a hydronic tubing run.
Page 3 (Customer Supplied) Conduit Temperature Sensor 3 ft. (approx.) Hydronic Tubing Run Extension Cable Figure 1 FWT-3H Electronic Assembly/Temperature Sensor Mounting Temperature Sensor FWT-3H Thermostat (rear view) Jacketed Extension Cable RELAY SENSOR 24 VAC 24 VAC power source Solenoid valve, pump contactor,...
Page 4: Troubleshooting
The yellow HEAT indicator blinks rapidly and there is no heat. The FWT-3H is detecting an open circuit in the Temperature Sensor connection. When this happens, the relay remains de- energized (contacts open), regardless of the temperature setting. Make sure the wires in the Temperature Sensor extension cable are properly connected to the terminal block.