Aprilaire 1720 Installation,Safety & Maintenance Manual
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Aprilaire 1720 Installation,Safety & Maintenance Manual

Aprilaire 1720 Installation,Safety & Maintenance Manual

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Humidity
Access
Wiring
Wire
Access
Routing
Port
Installation, Safety & Maintenance Manual
INSTALLER - PLEASE NOTE!
1. Installation must conform to all applicable codes.
2. A dedicated 20 Amp circuit is required for proper operation of the dehumidifier. If a dedicated circuit is not
available, do not install unit. Dehumidifier must be plugged in directly to an outlet. Do not use an extension cord.
3. For protection of the compressor, unit must be transported and installed in an upright position.
If the unit was shipped or stored on its side, a 24 hour settling period is required before running the unit.

TABLE OF CONTENTS

Safety Instructions . . . . . . . . . . . . . . .2
Overview . . . . . . . . . . . . . . . . . . . . . . .2
Specifications . . . . . . . . . . . . . . . . . . .2
Location Notes . . . . . . . . . . . . . . . . . .2
Ducting . . . . . . . . . . . . . . . . . . . . . . . .3
Drain Line . . . . . . . . . . . . . . . . . . . . . .3
Hanging . . . . . . . . . . . . . . . . . . . . . . .3
Control
Inlet
Model 1720
Installations
Whole Building . . . . . . . . . . . . . . . . . .4
Localized . . . . . . . . . . . . . . . . . . . . . . .6
Convertible . . . . . . . . . . . . . . . . . . . . .8
Float Switch . . . . . . . . . . . . . . . . . . .11
Filter
Access
Dip Switch Definitions . . . . . . . . . . .12
System Checkout . . . . . . . . . . . . . . .13
System Setup . . . . . . . . . . . . . . . . . .13
Maintenance . . . . . . . . . . . . . . . . . .13
Troubleshooting . . . . . . . . . . . . . . . .14
Sequences
of Operations . . . . . . . . . . . . . . . . . .15
Dehumidifier
Service
Access
Outlet
Port
Drain
On/Off
Switch

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Summary of Contents for Aprilaire 1720

  • Page 1: Table Of Contents

    Switch Port Installation, Safety & Maintenance Manual Model 1720 INSTALLER – PLEASE NOTE! 1. Installation must conform to all applicable codes. 2. A dedicated 20 Amp circuit is required for proper operation of the dehumidifier. If a dedicated circuit is not available, do not install unit.

  • Page 2: Safety Instructions

    OVERVIEW The purpose of the Aprilaire Model 1720 Dehumidifier is to keep the humidity in the building at acceptable limits to reduce the unwanted effects of high humidity. The dehumidifier will measure the dewpoint of the building to decide if it needs to run.

  • Page 3: Ducting

    The trap must be primed with water prior to start-up. If the 1720 is installed above a ceiling or in an area where flooding is a potential problem, it should be installed in a 3“ MIN...

  • Page 4: Whole Building

    WHOLE BUILDING INSTALLATION AND OPERATION In this configuration the dehumidifier will pull air from the return duct. The air passes through the dehumidifier, where moisture is removed, and then returned to the HVAC system downstream of the cooling coil in the supply plenum. This installation is used when the HVAC unit conditions the area where dehumidification is needed.
  • Page 5 WHOLE BUILDING INSTALLATION AND OPERATION (CONTINUED) DEHUMIDIFIER N.C. BACKFLOW FIGURE 4 – WIRING 24 VAC CONTROL DAMPER (10 VA min) TRANSFORMER THERMOSTAT HVAC EQUIPMENT See page 10 for ventilation control wiring instructions. See page 10 for fan cycling wiring instructions. See page 11 for float switch wiring instructions.

  • Page 6: Localized

    LOCALIZED INSTALLATION AND OPERATION In this configuration the dehumidifier will pull air from an area in the building. The air passes through the dehumidifier, where moisture is removed, and then is returned to the area. This installation is used when the HVAC unit conditions an area other than where dehumidification is needed, or in an area that needs supplemental dehumidification.
  • Page 7 LOCALIZED INSTALLATION AND OPERATION (CONTINUED) DEHUMIDIFIER FIGURE 7 – WIRING CONTROL THERMOSTAT HVAC EQUIPMENT See page 10 for ventilation control wiring instructions. See page 10 for fan cycling wiring instructions. See page 11 for float switch wiring instructions. 90-964 FIGURE 8 – SETTINGS SYSTEM SETUP Standard Fan Cycling...

  • Page 8: Whole Building / Localized Convertible

    OUTDOOR AIR INTAKE COOLING COIL AIR CLEANER OPTIONAL 6“ MIN 6“ MIN N.C. DAMPER 3‘ MIN SUPPLY AIRFLOW RETURN AIRFLOW HVAC UNIT N.C. DAMPER N.C. DAMPER SUPPLY TO RETURN FROM 1720 UNCONDITIONED UNCONDITIONED SPACE SPACE N.O. DAMPER N.O. DAMPER 90-947...
  • Page 9 WHOLE BUILDING / LOCALIZED CONVERTIBLE INSTALLATION AND OPERATION (CONTINUED) DEHUMIDIFIER FIGURE 10 – WIRING 24 VAC CONTROL DEHUMIDIFIER SYSTEM DAMPERS (40 VA min) TRANSFORMER THERMOSTAT HVAC EQUIPMENT WIRE NUT See page 10 for ventilation control wiring instructions. See page 10 for fan cycling wiring instructions. See page 11 for float switch wiring instructions.

  • Page 10: Ventilation And Fan Cycling

    VENTILATION / FAN CYCLING SETTINGS The Aprilaire Dehumidifier has the option OPTIONAL to monitor HVAC heating, cooling and fan FIGURE 12 DEHUMIDIFIER VENTILATION 24 VAC calls to assure the HVAC fan has CONTROL DAMPER (10 VA min) operated a predetermined amount of TRANSFORMER time each 1/2, 1, 2 or 3 hours.

  • Page 11: Float Switch

    Air Handler Fan Delivery (CFM) FLOAT SWITCH If the Model 1720 is installed above a ceiling, the unit should be FIGURE 18 placed in a drain pan with a normally closed condensate overflow safety switch (also known as a float switch). The float switch...

  • Page 12: Dip Switch Definitions

    DIP SWITCH DEFINITIONS MODEL 70 – OFF/ON (SYSTEM SETUP SWITCH #1): WHL BUILDING / CONVERTIBLE (SYSTEM SETUP SWITCH #3): Determines use of internal RH and temperature sensor or use of the RH and temperature sensor on the Occupied Space Determines when the dampers are powered open or closed. Control (Model 70).

  • Page 13: System Checkout

    Troubleshooting Guide. activate in TEST mode, refer to the Troubleshooting Guide. 5. For ventilation (optional) test, be sure that 24 VAC is applied in series with the Aprilaire ® Normally-Closed Damper (Model 6506) and connected to the “VENT DAMPER”...

  • Page 14: Troubleshooting

    TROUBLESHOOTING GUIDE SYMPTOM TROUBLESHOOTING PROCEDURE / POSSIBLE REASON Dehumidifier is producing • Reheat of outgoing air will cause a temperature increase across the dehumidifier. hot air. • Unit will possibly run continuously initially. After unit has “dried” building, dehumidifier will cycle, reducing load. Dehumidifier Blower is running, •...

  • Page 15: Of Operations

    TROUBLESHOOTING GUIDE (CONTINUED) SYMPTOM TROUBLESHOOTING PROCEDURE / POSSIBLE REASON The ventilation damper • The damper will not open if the cycle time within the TABLE 2 does not open when the current period has already been met. For instance if Outdoor Temperature Resistance...

  • Page 16: Limited Warranty

    5 minutes. If an outdoor air damper has been installed, then the Model 1720 is providing outdoor air ventilation. The 1720 will open the outdoor air damper whenever the HVAC system is running, up to the amount of time specified by the Cycle Time. The dehumidifier will energize the HVAC fan and open the outdoor air damper to provide the desired ventilation time if the HVAC system has not run for the specified Cycle Time.

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