Aprilaire 1180, 1160, 1150 User Manual

Safety, Installation, and Operation Manual

Automatic Steam Humidifier Control

READ COMPLETE INSTALLATION INSTRUCTIONS BEFORE STARTING.

WARNING

1. 240 volts may cause serious injury from electrical shock. Disconnect electrical power to the Steam Humidifier before starting installation.

2. Sharp edges may cause serious injury from cuts. Use care when cutting plenum openings and handling ductwork.

WARNING

This product must be installed by a qualified heating and air conditioning contractor. Failure to do so could result in serious injury from electrical shock or damage to product and voids product warranty due to possible product misapplication.

CAUTION

1. Do not set humidity higher than recommended. Condensation damage may result.

2. Do not set humidity up to recommended levels if there is condensation on the inside of windows. Condensation damage may result.

3. Do not mount Automatic Steam Humidifier Control on supply plenum or duct. High supply temperatures will cause the control to malfunction.

4. When installing Automatic Steam Humidifier Control on downflow furnaces, ensure blower continues to run after a heat call is satisfied to eliminate high temperatures from damaging the Automatic Steam Humidifier Control.

5. Do not configure Automatic Steam Humidifier Control for Modulating Control (jumper JP2 set to 1 & 2) when connected to a Model 1150 Steam Humidifier. Failure of humidifier may result.

THESE INSTALLATION INSTRUCTIONS ARE FOR THE AUTOMATIC STEAM HUMIDIFIER CONTROL ONLY!

For Aprilaire

Humidifier installation, follow Aprilaire Humidifier Installation Instructions.

PRINCIPLES OF OPERATION

The Aprilaire Automatic Steam Humidifier Control is designed to be installed in the return duct of the HVAC system. The control strategy of the Automatic Steam Humidifier Control is matched to the humidifier being controlled: when used with a Model 1150 Aprilaire Steam Humidifier, the Control supplies an on/off signal to the humidifier. When used with a Model 1160 or 1180 Aprilaire Steam Humidifier, the Control supplies a modulating signal to the humidifier. In terms of outdoor temperature compensation, the Control can be set up in automatic or manual mode, regardless of the humidifier model being controlled. The automatic mode incorporates the supplied Outdoor Temperature Sensor to automatically adjust the control set-point based on the outdoor temperature. The manual mode does not require an outdoor temperature measurement and is used for specific set-point control with the control set-point manually adjusted by the user. The Automatic Steam Humidifier Control will accurately control the humidity in the conditioned space within the range of 15% – 55% RH.

CONTROL TYPE

ON/OFF CONTROL FOR MODEL 1150

The Automatic Steam Humidifier Control sends a 10 VDC signal to the humidifier when the measured return air relative humidity is 3% or more below the set-point. This energizes the humidifier at 100% output. The Steam Humidifier is either on at 100% capacity or it is off.

MODULATING CONTROL FOR MODEL 1160 & 1180

The Automatic Steam Humidifier Control sends a signal to the humidifier between 0 and 10 VDC based on: a) the difference between measured relative humidity and set-point relative humidity, and b) where this difference or ‘error’ falls within an adjustable proportional control band. The output of the Control, and therefore the Steam Humidifier, is a ‘proportion’ of maximum output based on ‘a’ and ‘b’ above. See Figure 1 for graphical representation of the output.

MEASURED %RH - SETPOINT %RH

OUTPUT

Note:

The Proportional Control Band can be adjusted to 6%, 9%, 12%, or 15% RH. The factory setting of 12% is depicted at left.

PROPORTIONAL

CONTROL BAND

0 +6-6

10 VDC

5 VDC

0 VDC

FIGURE 1 – Modulating Control Output

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R17

H+24V CI-I+ ODTH-

129

JP2

123

FIGURE 2 – On/Off Setting for Model 1150

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912

H- ODTI+ I- C24V H+

R17

321

JP2

FIGURE 3 – Modulating Setting for Model 1160 or 1180

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AUTOMATIC MODE

The automatic mode is the preferred method when the application requires that the Control automatically adjust the RH set-point based on the outdoor temperature. This is recommended for all comfort-based applications such as office buildings, schools, day cares, etc. It is also recommended for any application where the primary concern is to avoid the potential for condensation that can form on areas within the building such as windows and within walls. When installed in this mode, the Control utilizes an Outdoor Temperature Sensor that will track the actual outdoor temperature. The Control then automatically adjusts the desired indoor RH.

MANUAL MODE (SPECIFIC SET-POINT CONTROL)

The manual mode is the preferred method when the application requires that a specific set-point be maintained regardless of the outdoor temperature. This is recommended for all process-based applications such as print shops, book stores, test facilities, etc.

When installed in this mode, the Outdoor Temperature Sensor is replaced with a “manual” resistor case that prevents the Control from adjusting the space RH set-point based on the outdoor temperature, and controls to the specific set-point selected on the Control.

Note: If the building is not designed to handle the amount of RH the humidifier is supplying, the building occupants may need to adjust the RH setting on the Control to a lower value during extreme days to prevent condensation on interior surfaces. The RH setting should be adjusted upward when the outdoor temperature goes up.

As an example, using the 12% proportional band (factory-setting), when the measured RH is 6% above the set-point the output will be 0 VDC; when the measured RH is 6% below set-point the output will be 10 VDC; when the measured RH is 3% below set-point the output will be approximately 7.5 VDC. The humidifier uses this varying signal to time-proportion the operation of the heating elements in the tank. 10 VDC output corresponds with 100% humidifier capacity, 5 VDC with 50% capacity, etc. Modulating control will result in a more precise control of relative humidity.

OUTDOOR TEMPERATURE COMPENSATION

STEP 1: VERIFY CONTROL TYPE

INSTALLATION

When shipped with a Steam Humidifier, the Automatic Steam Humidifier Control is preset at the factory to match the humidifier model: Model 1150 Steam Humidifier is configured for on/off control while the Model 1160/1180 Steam Humidifier is configured for modulating control. When shipped as a replacement (Model 57), the Control is preset for use with a Model 1150 (i.e., on/off control). If using the Model 57 with a Model 1160 or 1180, the ‘control type’ setting must be changed for modulating control. See below.

Remove the door to the Automatic Steam Humidifier Control and look at the area on the circuit board above the terminal block. The three-pin header labeled JP2 should be set in the following manner:

For the Model 1150, the Control must be set to the on/off configuration. The shunt must be placed on the 2 & 3 pins. See Figure 2.

For the Model 1160 or 1180, the Control must be set to the modulating configuration. The shunt must be placed on the 1 & 2 pins. See Figure 3.

CAUTION

Improper jumper settings may damage humidifier.

The shunt on the JP2 header pin must be set in accordance with the instructions in this manual.

AIR

FLOW

POSSIBLE DISPERSION TUBE LOCATIONS

AIR FLOW PROVING SWITCH

AUTOMATIC STEAM HUMIDIFIER CONTROL

AIR

FLOW

SUPPLY AIR

PLENUM

RETURN

AIR DROP

AIR

FLOW

SUPPLY

AIR DUCT

HIGH LIMIT

HUMIDITY

SWITCH

FIGURE 4 – Split System Installation

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Outside

Air

Filters

Heating Coil

Cooling Coil

Air Flow Proving Switch

Duct High Limit Humidity Control from Dispersion Point “A”

Motorized

Air Dampers

Dispersion Tube A

Dispersion Tube B

Roof

Economizer control device

AUTOMATIC

STEAM

HUMIDIFIER

CONTROL

Supply DuctReturn Duct

FIGURE 5 – Rooftop Unit Installation

Above expected

snow line

Outdoor Temperature Sensor leads

North, East or West side of building

Outdoor

Temperature

Sensor

Bracket

FIGURE 6 – Outdoor Temperature Sensor Location

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STEP 2: DETERMINE LOCATION FOR CONTROL

AND MOUNT ON DUCT

The Control must be mounted in the return duct of the HVAC system. See Figure 4 for a split-system installation and Figure 5 for a rooftop unit installation. The Control must be at least 1 foot upstream of the steam dispersion tube and any fresh air intake ductwork. Use the template in the back of this manual to mark the duct opening. After cutting the hole in the duct, mount the Control tightly to the duct using 4 sheet metal screws (not provided).

STEP 3: DETERMINE LOCATION FOR OUTDOOR

TEMPERATURE SENSOR

The location of the Outdoor Temperature Sensor must meet these three requirements:

1. Must be mounted on North, East or West side of building out of direct sunlight

2. Must be at least 3 feet from all exhaust vents

3. Must be above expected snow line (See Figure 6)

Incorrect humidity levels will result if these requirements are not met. Attach the sensor bracket to the building with a #8 galvanized screw.

STEP 4: LOCATE ACCESS HOLE FOR WIRING TO

OUTSIDE SENSOR

Look for or provide an opening in the building envelope for running wire to the Sensor. A convenient way to get wire to the Sensor is to make use of unused wires running to the A/C condensing unit (if applicable). Other ways are to use existing holes for telephone lines, A/C lines, water meter, etc. Read all equipment instructions beforehand for possible conflicts and warnings. Do not run outdoor temperature sensor wiring alongside

wires carrying high voltage (120VAC or higher).

STEP 5: ALTERNATE LOCATION FOR OUTDOOR

TEMPERATURE SENSOR

The Sensor can also be mounted in the center of either:

• PVC fresh air intake pipe for the split system furnace

• Fresh air intake duct. Mount the sensor with a #8 galvanized screw.

In both cases, the Sensor must be no more than 3 feet from the outside wall. See Figure 7.

If it is not feasible to use the Outdoor Temperature Sensor in any of the ways described, the Automatic Steam Humidifier Control can be set for Manual Operation. See Figure 8 on the next page for details.

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