Installation Instructions
Page 1
... cause a hazardous condition. 2. Disconnect power supply before beginning installation. H8908A,D control. NOTE: The H8908 electrical connections are not shared with the thermostat. H8908A/B Humidistat H8908C/D Dehumidistat APPLICATION The H8908 family of low-voltage humidistats/ dehumidistats provide accurate control of whole house humidifiers, dehumidifiers, and ventilators. INSTALLATION INSTRUCTIONS Fig. 1. They have a snap-acting, dust-proof SPST switch and can cause electrical shock. Before Installing this Product... 1. Check the...
... cause a hazardous condition. 2. Disconnect power supply before beginning installation. H8908A,D control. NOTE: The H8908 electrical connections are not shared with the thermostat. H8908A/B Humidistat H8908C/D Dehumidistat APPLICATION The H8908 family of low-voltage humidistats/ dehumidistats provide accurate control of whole house humidifiers, dehumidifiers, and ventilators. INSTALLATION INSTRUCTIONS Fig. 1. They have a snap-acting, dust-proof SPST switch and can cause electrical shock. Before Installing this Product... 1. Check the...
Installation Instructions
Page 2
... mounting location. Run wire to properly connect the humidistat. H8908A/B HUMIDISTAT H8908C/D DEHUMIDISTAT DUCT INSTALLATION 1. diameter wire hole in . (381 mm) MINIMUM RETURN AIR DUCT M13369 Fig. 3. of wire to duct and drill holes for mounting screws. IMPORTANT Use rated 18-22 gauge wire. Duct installation locations. 2. Run two-fan, low-voltage wire to the mounting loca- IMPORTANT Use rated 18-22 gauge wire. NOTE: Select a location clear of the template...
... mounting location. Run wire to properly connect the humidistat. H8908A/B HUMIDISTAT H8908C/D DEHUMIDISTAT DUCT INSTALLATION 1. diameter wire hole in . (381 mm) MINIMUM RETURN AIR DUCT M13369 Fig. 3. of wire to duct and drill holes for mounting screws. IMPORTANT Use rated 18-22 gauge wire. Duct installation locations. 2. Run two-fan, low-voltage wire to the mounting loca- IMPORTANT Use rated 18-22 gauge wire. NOTE: Select a location clear of the template...
Installation Instructions
Page 3
4. For duct mount, slide the black gasket onto the base bracket. NOTE: Use gasket only when mounting the control to the wall with two 1-in . (25 mm) screws (provided) or to ductwork. Seal base bracket. 5. tion. M24722 Fig. 9. H8908A/B HUMIDISTAT H8908C/D DEHUMIDISTAT M24733 Fig. 8. Secure to the duct with four 1-in . (25 mm) screws (provided). Secure the base bracket to a wall. See Fig. 8. Leave off when mounting to the duct or remote loca- Remove the base bracket from the humidistat. Mount base bracket to duct or remote location. 3 69-1341EF-01
4. For duct mount, slide the black gasket onto the base bracket. NOTE: Use gasket only when mounting the control to the wall with two 1-in . (25 mm) screws (provided) or to ductwork. Seal base bracket. 5. tion. M24722 Fig. 9. H8908A/B HUMIDISTAT H8908C/D DEHUMIDISTAT M24733 Fig. 8. Secure to the duct with four 1-in . (25 mm) screws (provided). Secure the base bracket to a wall. See Fig. 8. Leave off when mounting to the duct or remote loca- Remove the base bracket from the humidistat. Mount base bracket to duct or remote location. 3 69-1341EF-01
Installation Instructions
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... services the furnace blower. Wiring H8908 with humidifier. Wiring H8908 with electronic humidity controls. 6. Attach the humidistat to humidifier (or dehumidifier/ventilator) instructions, if available; If not using a current sensing relay or sail switch, the humidifier must comply with applicable local codes, ordinances and regulations. Using wire nuts, connect the low-voltage wire to the raised edge at the top of current sensing relay with fan interlock. Wire the humidistat...
... services the furnace blower. Wiring H8908 with humidifier. Wiring H8908 with electronic humidity controls. 6. Attach the humidistat to humidifier (or dehumidifier/ventilator) instructions, if available; If not using a current sensing relay or sail switch, the humidifier must comply with applicable local codes, ordinances and regulations. Using wire nuts, connect the low-voltage wire to the raised edge at the top of current sensing relay with fan interlock. Wire the humidistat...
Installation Instructions
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.../B HUMIDISTAT H8908C/D DEHUMIDISTAT H8908 SAIL SWITCH 2 30 20 10 OFF 40 50 60 ON TRANSFORMER 1 L2 L1 (HOT) HUMIDIFIER 1 POWER SUPPLY. N.C. Typical wiring diagram for dehumidification. 5 69-1341EF-01 HUMIDIFIER 1 TO SYSTEM FAN NOTE: FOLLOW THE INSTALLATION INSTRUCTIONS INCLUDED WITH THE STEAM HUMIDIFIER TO WIRE THE SYSTEM FAN. EQUIPMENT INTERFACE MODULE 1 2 3 C 24 VAC R RC RH CONV. Wiring H8908 with VisionPRO® Thermostat...
.../B HUMIDISTAT H8908C/D DEHUMIDISTAT H8908 SAIL SWITCH 2 30 20 10 OFF 40 50 60 ON TRANSFORMER 1 L2 L1 (HOT) HUMIDIFIER 1 POWER SUPPLY. N.C. Typical wiring diagram for dehumidification. 5 69-1341EF-01 HUMIDIFIER 1 TO SYSTEM FAN NOTE: FOLLOW THE INSTALLATION INSTRUCTIONS INCLUDED WITH THE STEAM HUMIDIFIER TO WIRE THE SYSTEM FAN. EQUIPMENT INTERFACE MODULE 1 2 3 C 24 VAC R RC RH CONV. Wiring H8908 with VisionPRO® Thermostat...
Installation Instructions
Page 6
... according to test proper installation. Turn humidistat on cold surfaces such as windows, the homeowner must adjust the setpoint as the outdoor temperature changes. You will hear an audible click if installed correctly, and water will begin flowing to the humidifier. Recommended settings are available on the control and in the table below. Recommended Humidity Controller Settings. To increase the relative...
... according to test proper installation. Turn humidistat on cold surfaces such as windows, the homeowner must adjust the setpoint as the outdoor temperature changes. You will hear an audible click if installed correctly, and water will begin flowing to the humidifier. Recommended settings are available on the control and in the table below. Recommended Humidity Controller Settings. To increase the relative...
Installation Instructions
Page 8
H8908A/B HUMIDISTAT H8908C/D DEHUMIDISTAT Automation and Control Solutions Honeywell International Inc. Rev. 07-07 Registered Trademark © 2007 Honeywell International Inc. 69-1341EF-01 M.S. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S.
H8908A/B HUMIDISTAT H8908C/D DEHUMIDISTAT Automation and Control Solutions Honeywell International Inc. Rev. 07-07 Registered Trademark © 2007 Honeywell International Inc. 69-1341EF-01 M.S. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S.