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HUMIDIFI ER
HUMIDIFICATEUR
HUMIDIFIER
I IFI T
HUM D CA EUR
READ AND SAVE THESE INSTRUCTIONS
HE420A Steam Power Humidifier
INSTALLATION INSTRUCTIONS
APPLICATION
The HE420A Steam Power Humidifier uses a thermal fan
interlock control to provide humidification for the whole
house. The steam power humidifier is designed to work
with high efficiency furnaces and heat pumps.
INSTALLATION
IMPORTANT
This product is for residential applications only
and must be installed by a qualified HVAC con-
tract
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HE420A STEAM POWER HUMIDIFIER Mount Horizontally Using Mounting Bracket (Preferred Mounting Method) IMPORTANT The duct must be at least 10 in. (254 mm) wide to use this mounting method. The duct is strongest when using the bracket mounting method because the least amount of duct reinforcement is required because of the bracket location. See Fig. 1. However, in some installations, reinforcement may still be necessary to help support the weight of the humidifier and keep the humidifier leve
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HE420A STEAM POWER HUMIDIFIER IMPORTANT Mount Horizontally On Reinforced Duct Position the valve so water flows from the top or This horizontal mounting method usually requires duct side to reduce the chance of clogging the valve reinforcement to support the weight of the humidifier and with minerals. keep it level. The mounting bracket is not used. See Fig. 2. Lightly clean the copper tubing ends with fine sandpaper before making any connections. 1. Position the bracket to the bottom of th
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HE420A STEAM POWER HUMIDIFIER Outdoor temperature sensor FINISH MOUNTING AND PLUMBING Sensor shield Manual mode faceplate THE HUMIDIFIER Mounting bracket 2. Disassemble the humidistat. Pull knob off, then 1. Mount the humidifier as instructed in the Select remove the cover by inserting a screwdriver in the Location and Mount section. slot on the right side of the humidistat. 2. Route the tubing to the humidifier float valve. 3. Mount the humidistat on the COLD AIR RETURN. Select a m
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HE420A STEAM POWER HUMIDIFIER Table 1. Humidity Settings. Installing the Humidistat to Operate Outdoor Temperature °F Manually Dial 1. Locate the three-pin arrangement marked AUTO/ Position -10 0 10 20 30 40 MAN protruding from the control board (right of wir- 4 15% 20% 25% 30% 35% 40% ing connections). 5 20% 25% 30% 35% 40% 45% 2. Pull upward to remove the black, two-pin connector from the auto position. Reinstall it in the manual 6 25% 30% 35% 40% 45% 45% position (on the center and right-
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HE420A STEAM POWER HUMIDIFIER a. If set up correctly, the humidifier will begin oper- CHECK THE HUMIDIFIER ating. In Test mode, the humidistat will operate for approximately one minute. OPERATION b. If the humidifier does not activate properly in Test mode, refer to Appendix A. After installation is complete, use the following steps to Set the humidistat. Refer to Humidistat Operating 4. check the humidifier operation: Instructions for detailed instruction on initial settings. a. If ho
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HE420A STEAM POWER HUMIDIFIER APPENDIX A Table 3. Compensating Humidistat Troubleshooting Guide. PROBLEM SOLUTION NOTES Humidifier does not Confirm the outdoor temperature sensor is operate in Test connected to the correct terminals on the mode. humidistat. (For manual operation, ensure the jumper pins are positioned correctly.) Check wiring diagram (Figure 1) for correct installation. Check the voltage at the humidistat 24 VAC terminals. (Should be 22-30 VAC.) Ensure the contr
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HE420A STEAM POWER HUMIDIFIER APPENDIX B Table 4. Safety Control Relay (SCR) Operation and Troubleshooting Guide. Condition Cause Action Required SCR LED shows rapid series of red, Condition Normal. SCR processor is No action required. green, and yellow lights, followed by powering up and checking internal no LED display. operation. Humidifier won't operate. No SCR Problem! SCR circuit is not closing or Check SCR power; check humidistat LED display. humidistat is not calling for humidity. oper
