Aprilaire 1150, 1160 - page 15

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CHOOSING A DISTRIBUTION TUBE LOCATION

When installing a steam humidifier on a packaged rooftop unit application, there are two locations that can be

used to mount the steam distribution tube: supply plenum/duct (Location A) or the return plenum/duct (Location B).

Note: Wherever distribution tube is installed, there must be a minimum of 4.5” between top of tube and the duct

ceiling. Refer to Figures 12 and 13 on page 17.

Location A is the best choice because:

• The distribution tube is humidifying 100% of the air

• The supply air temperature is typically higher than the return air temperature, allowing for better absorption

of the steam

Note: In applications using zone control products, the distribution tube must be installed upstream of all zone

control dampers to ensure that all zones receive humidified supply air

Choosing control device locations

• Install the high humidity limit switch (a recommended optional device) a minimum of 5’ (1.5 m) downstream

of the distribution tube.

• Install the Automatic Steam Humidifier Control in the return air duct a minimum of 6” upstream of the

distribution tube.

• Install the airflow proving switch in the supply air plenum.

OM-4043

FIGURE 11 – Placing a Distribution Assembly in a Rooftop Air Handler Application

15

Contents

Main TABLE OF CONTENTS ATTENTION INSTALLER WARNING PRODUCT OVERVIEW FIGURE 1 Product Overview TABLE 1 Electrical Specifications FIGURE 2 Dimensions (pertains to Models 1150 and 1160) FIGURE 3 Mounting Hole Locations FIGURE 4 Distribution Tube Dimensions Page Page FIGURE 6 Model 1150 Wiring Diagram INSTALLATION APRILAIRE STEAM HUMIDIFIER MODEL 1150 SINGLE HEATER WIRING DIAGRAM ON/OFF CONFIGURATION FIGURE 7 Model 1160 Wiring Diagram APRILAIRE STEAM HUMIDIFIER MODEL 1160 DUAL HEATER WIRING DIAGRAM MODULATING CONFIGURATION Page TABLE 3 Factory Slide Switch Settings TABLE 4 Slide Switch S1 Settings by Model Page Page Page WARNING FIGURE 12 Distribution Tube Installation FIGURE 13 Page Page WARNING FIGURE 16 Model 1150: Input Wiring for Automatic Steam Humidifier Control (on/off configuration) FIGURE 18 Model 1160: Input Wiring for Optional 0-10 VDC Signal by Others FIGURE 19 Model 1160: Input Wiring for Optional 4-20 mA Signal by Others Page FIGURE 21 Field Piping Overview Showing Hose Drain Connection FIGURE 22 Field Piping Overview Showing Hard Pipe Drain Connections Page OPERATION WARNING MAINTENANCE CAUTION WARNING Page Page TROUBLESHOOTING Page Page Page Note: See page 37 for a listing of replacement part numbers. REPLACEMENT PARTS FIGURE 29 Display Panel Ribbon Connection FIGURE 30 Display Panel Connector Polarity FIGURE 31 Internal Controller Board FIGURE 32 Humidifier Replacement Parts TABLE 6 Replacement Parts (refer to Figure 32) APPENDIX ABSORPTION DISTANCE CALCULATION FIGURE 33 Aprilaire Steam Humidifiers Absorption Distance Chart TABLE 7 Moisture Content Factor WARRANTY Thank you!