Aprilaire 1160, 1150 Owner's Manual

Humidifier

Steam Humidifier

Models 1150, 1160, and 1180

Installation, Operation, and Maintenance Manual

READ AND SAVE THESE INSTRUCTIONS

TABLE OF CONTENTS

PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Materials Provided and Not Provided . . . . . . . . . . . . . . . . . .

Electrical Specifications, Capacities and Weights . . . . . . . .

Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Overview of Humidifier Operation

Sequence of Operations

INSTALLATION

Wiring Diagrams, Unit

Setting Slide Switches

Choosing a Location for Humidifier Components . . . . . . . . 17

Distribution Tube Installation . . . . . . . . . . . . . . . . . . . . . . .

Mounting the Humidifier . . . . . . . . . . . . . . . . . . . . . . . . . . .

Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wiring Diagrams, Input . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Airflow Proving Switch Installation

Supply Water and Drain Piping

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

. . . . . . . . . . . . . . . . . . . . . 7

. . . . . . . . . . . . . . . . . . . 29

. . . . . . . . . . . . . . . . . . . . . . 29

ATTENTION INSTALLER

OPERATION

Start-up Proced

MAINTENANCE

Inspect and Service the Humidifier

Off-season Shut Down Procedure

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . .

APPENDIX – ABSORPTION DISTANCE CALCULATION

WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover

ure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

. . . . . . . . . . . . . . . . . . . 35

. . . . . . . . . . . . . . . . . . . . 38

. . . . . . . . . . . . . . . . . . . . . . . . . . 46

WARNING

1. 240 volts may cause serious injury or death from electrical shock. Disconnect power before installing supply wiring.

This product must be installed by qualified HVAC and electrical contractors. Failure to do so voids product warranty due to possible product misapplication.

This product must be installed in compliance with local, state, and federal codes.

CAUTION

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

2. Failure to follow the instructions in this manual for installation of distribution tube, airflow proving switch, and high humidity limit switch may cause condensation damage.

2. Water temperature in excess of 140°F (60°C) may cause serious injury due to burns. Allow unit to cool before draining or removing chamber.

3. The humidifier chamber, distribution assembly, and all connected hose or piping may contain or discharge hot steam and/or hot water at 212°F (100°C). Discharged steam is not visible. Contact with hot surfaces, discharged hot water, or air into which steam has been discharged may cause severe personal injury.

4. Water pressure greater than 120 psi (827 kPa) may cause the humidifier to overflow.

5. Humidifier weighs up to 100 lbs (45 kg) when operating. Improper mounting of humidifier may cause humidifier to fall from wall or ceiling resulting in serious injury. Mount humidifier to a structurally stable surface per the instructions in this manual.

6. Failure to properly ground unit may result in property damage due to fire, or serious injury or death from electrical shock.

7. Failure to follow the instructions in this manual may cause moisture to accumulate, which may cause bacteria and mold growth or dripping water into building spaces. Dripping water may cause property damage.

PRODUCT OVERVIEW

Aprilaire Steam Humidifiers create steam by boiling water inside a steam chamber. This is accomplished by the transfer of energy from electric heating elements to the water inside the chamber. A three-level water probe is used to determine when to turn on and off a water fill valve in order to bring water into the chamber. Once the chamber is full and there is a call for humidity from the Automatic Steam Humidifier Control, the heating elements will be energized causing the water to boil. The boiling water creates steam which, due to the moderate pressurization of the chamber that comes from boiling, is forced through the vapor hose and steam distribution tube into the duct system. As water is boiled off, the water level in the steam chamber will drop. The water probe will sense when it reaches a low point and will cause the fill valve to open.

The process of boiling the water in the steam chamber will cause minerals and impurities in the water to drop out. Depending on the hardness and quality of the water, this can create a substantial build-up within the steam chamber. The unit will drain the chamber periodically to help clean the steam chamber and reduce the amount of cleaning required during maintenance.

Aprilaire Steam Humidifiers are controlled by an Automatic Steam Humidifier Control mounted in the return duct that will sense the relative humidity (RH) in the return air. If the return air is below the RH setpoint, the control will send the humidifier a signal to begin producing steam. Once this happens, the airflow proving switch (included) will check to ensure that the equipment blower is operating. If the blower is not operating, the humidifier can send the equipment a signal to turn the fan on.

• The Aprilaire Steam Humidifier Model 1150, 12 lb/hr unit, features an Automatic Steam Humidifier Control with on/off control. The on/off control will send a 10 VDC signal to the humidifier when the measured return air RH is 3% or more below setpoint to turn the unit on at 100% output.

• The Aprilaire Steam Humidifier Model 1160, 24 lb/hr unit, and the Model 1180, 48 lb/hr unit, feature an Automatic Steam Humidifier Control with modulating control. This control sends a signal between 0 and 10 VDC that is proportional to the difference between setpoint RH and the measured return air RH. The signal for 100% humidifier output is 10 VDC and occurs at a control point that is adjustable. The signal for 50% output is 5 VDC and occurs at the setpoint. The adjustable RH proportional control band can be set on the board to 6%, 9%, 12% (default), or 15%. The humidifier uses this varying signal to time-proportion the operation of the heating elements in the chamber.

The Automatic Steam Humidifier Control features an outdoor temperature sensor and is equipped to provide RH setpoint compensation based on the actual outdoor temperature. When the weather gets colder outside, there can be problems with condensation when introducing humidity into the building. The control recognizes this and adjusts the setpoint in the building to a lower level. The control will still provide humidity to the building, but will not attempt to maintain a humidity level higher than is appropriate for the current outdoor temperature. For applications that require specific set-point control, regardless of outdoor temperature, the Control can be set up for manual operation. In Manual Mode, the outdoor temperature sensor is not used and the RH is controlled to the specific setting on the Control.

MATERIALS PROVIDED MATERIALS NOT PROVIDED

1 Humidifier (Model 1150: 1 heater, 12 lbs/hr; Model 1160: 2 heater, 24 lbs/hr; Model 1180:

3 heater, 48 lbs/hr)

1 Distribution Tube (Model 1150: 10” active, 14” overall; Model 1160: 16” active, 20” overall;

Model 1180: 25½” active, 29½” overall.

1 10 ft. Steam Hose, 1½” I.D. for Models 1150/1160, 2" I.D. for Model 1180 1 1 ft. Drain Hose, 1” I.D. 2 Hose Clamps (for Steam Hose) 2 Hose Clamps (for Drain Hose), 1” I.D. 2 Face Plates for Mounting Distribution Tube (1 set) 2 3/8” x 2” Lag Bolts for Mounting Humidifier 1 Automatic Steam Humidifier Control 1 Airflow Proving Switch 1 Installation, Operation, and Maintenance Manual

Electrical Supplies – quick disconnect box, conduit, and wire (for power to the unit and wiring to control devices)

Plumbing Supplies – supply and drain piping, fittings, etc.

High Humidity Limit Switch

Hanging Brackets – for mounting humidifier from ceiling

Plastic Tubing, ¼" I.D. – for airflow proving switch

Sheet Metal Screws – for attaching distribution tube faceplate

FIGURE 1 – Product Overview

Distribution Tube

Flexible steam hose (1½" in Models 1150 and 1160, 2" in Model 1180)

Control wiring knockout

Power wiring knockout

Electrical power area

¾” (DN20) copper overflow and drain

Duct

Electrical controls area

Internal controller board

Field wiring terminal block

Display panel

Fill Valve ¼” (DN8) compression fitting

Immersion heaters (1 in Model 1150, 2 in Model 1160, and 3 in Model 1180)

Removable steam chamber

Cover/shroud

TABLE 1 – Electrical Specifications

Current draw (amps)

Single-phase Three-phase

Circuit

Breaker

(amps)

Model

number

Maximum

steam capacity

minimum

lbs/hr kg/h 240V* 240V* lbs kg lbs kg

1150 12 5.4 16.7 -- 25 4 62 28 59 27

1160 24 10.9 33.3 -- 45 8 62 28 68 31

1180 48 21.8 -- 38.5 50 16 88 40 101 46

Note: Models 1150,1160 and 1180 operate at 50/60 Hz. * 208V single-phase may also be used but the steam capacity will be approximately 25% lower than the values above. It is recommended that the same size

circuit breakers be used with 208V single-phase as listed above for 240V.

Shipping weight

(includes packaging

and all materials in

the box)

Operating weight

(humidiﬁer only, with

water in chamber)

OM-4051

FIGURE 2 – Dimensions (pertains to Models 1150, 1160 and 1180)

Power wire knockout

LEFT SIDE VIEW

Venting

3.09” (78 mm)

Steam outlet

18.93”

(481 mm)

TOP VIEW

5.50”

(140 mm)

24.06”

(611 mm)

FRONT VIEW

11.89”

(302 mm)

(165 mm)

6.50”

1.00” (25 mm)

Control wire knockout

9.99”

(254 mm)

Models 1150/1160

15.6”

(396 mm)

Model 1180

Chamber drain

1.37” (35 mm)

BOTTOM VIEW

(611 mm)

3.06” (78 mm)

24.06”

Chamber fill

0.83” (21 mm)

1.19” (30 mm)

OM-4039

FIGURE 3 – Mounting Hole Locations

BACKVIEW

Keyhole for 3/8" diameter fasteners (2)

FIGURE 4 – Distribution Tube Dimensions

MODEL 1150

14" Tube length

1.50 (TYP)

0.75" (19.0mm)

16.00" (406.4mm)4.00"

90-914

MODEL 1160

20" Tube length

1.50 (TYP)

10" Active dispersion length

1½" Diameter dispersion tube

MODEL 1180

3/8" Flat washer

3/8-16 x ½" Hex head bolt

Molded tubelet with 3/16" orifice

1.50 (TYP)

25½" Active dispersion length

29½" Tube length

1½" Diameter dispersion tube

3/8" Flat washer

3/8-16 x ½" Hex head bolt

16" Active dispersion length

Molded tubelet with ¼" orifice

3/8" Flat washer

3/8-16 x ½" Hex head bolt

2" Diameter dispersion tube

Molded tubelet with ¼" orifice

90-912

OVERVIEW OF HUMIDIFIER OPERATION

INTERNAL CONTROLLER - FEATURES OF OPERATIONS

The internal controller within the humidifier cabinet responds to external inputs (e.g., humidistat and airflow proving switch) and internal inputs (e.g., water level probe inside the steam chamber) to provide:

• Relative humidity (RH) control

– Model 1150: With an on-off demand signal, the controller

maintains RH within 5% to 7% of set point.

– Model 1160 and 1180: With a modulating demand signal,

the humidifier maintains RH within 2% to 4% of set point. Modulating demand signal options include a 0–10 VDC humidistat signal (humidistat provided), or a signal by others (0–10 VDC or 4–20 mA).

• Automatic water level control and safety shut-down

If there is insufficient water, an electronic water level probe sends a signal to the controller to add water or to turn off the heaters. (See Figure 5

• Operating time monitoring

The controller accumulates humidifier run time to activate end-of-season draining, water cool-down, and auto draining.

• Automatic preheating

– Model 1160 and 1180: During normal operation, in the case of a re-fill cycle or a period of no demand for humidity, the controller will recognize that the tank has cooled down. The heaters will energize for an appropriate amount of time to bring water close to boiling temperature. Preheat only occurs when there is a demand for humidity.

• Chamber water cooling before draining

To ensure that water is at or below 140°F (60°C) before discharging to the plumbing system, the humidifier remains idle for a defined period of time before draining.

• Ensuring duct airflow

The humidifier will not make steam unless the HVAC system blower is on and the airflow proving switch verifies there is airflow in the duct.

FIGURE 5 – Electronic Water Level Probe

• Automatic end-of-season draining

If the humidifier doesn’t receive a humidity demand signal for 72 hours, the chamber automatically drains.

• Periodic drain and flush

To reduce mineral buildup in the chamber, the humidifier automatically drains at intervals based on operating time, output capacity, and water type. At the end of the drain cycle, the supply water is brought on to briefly flush the chamber.

Fill valve closes

Fill valve opens

Low-water cutoff

The humidifier monitors and controls water levels electronically using a three-rod probe. The humidifier responds with the above actions when the water level reaches each probe rod.

VLC-OM-030

SEQUENCE OF OPERATIONS

Note: Sequence is for normal operation, starting with an empty Steam Chamber.

Model 1150 Humidifier is connected to: 240 VAC, single phase input power; Model 57 on/off Automatic Steam Humidifier Control (ASHC); Airflow Proving Switch and High Humidity Limit Switch. Water supply is turned on, steam distribution and drain connections are made.

TABLE 2 – Sequence of operation for Model 1150

Operation Expected Results

Humidiﬁer power turned on.

Fill Sequence: Water level probe will sense an empty chamber and turn on the ﬁll valve.

Demand for humidity from control circuit: (ASHC is calling for humidity and airﬂow is present.)

As water is boiled off, the water level drops and the water level probe will sense a need for more water in the chamber.

Demand for humidity is satisﬁed.

After a predetermined amount of run time (element energized), an Autodrain sequence is performed. The control will initiate Autodrain during a period of inactivity when the water in the chamber is cool.

If demand for humidity prevents the chamber from cooling, a forced Autodrain sequence is initiated. During a forced Autodrain sequence, the humidiﬁer will not generate steam, even if there is a call for humidity.

End of season drain.

• Internal Controller (LW420) powered up.

• LEDs blink - On/Off LED stays on.

• +24 VDC available at terminal #30 on humidiﬁer referenced to C.

• After a few second delay, the Fill LED will turn on and the ﬁll valve will open. The Fill LED will remain lit as long as the ﬁll valve is open.

• Water will ﬂow into steam chamber. Note: It takes approximately 5 minutes to ﬁll the Model 1150 chamber.

• Water level probe will sense a properly ﬁlled chamber and Fill LED will turn off .

• Fill valve will close.

• ASHC will send a nominal 10 VDC signal from H+ to terminal #1 on humidiﬁer.

• Fan Relay will energize in a few seconds.

• LW420 will check for a closed ‘enable’ circuit between terminal #2 and C (Airﬂow Proving and High Humidity Limit check).

• If ‘enable’ circuit is closed, Steam LED will turn on and remain on as long as the call for humidity is present.

• After a 15 second delay, the Safety Relay will be energized.

• After a 3 second delay, the Control Relay will be energized.

• Heating element will be energized.

• After about ten minutes, the water will boil and steam will be generated and forced out of chamber, up through hose and dispersion tube into the duct.

• CAUTION: Steam chamber and hose will be very hot.

• NOTE: During the initial start-up, steam hose may emit an odor.

Fill Sequence listed above.

• See

• Steam LED will turn off.

• Control Relay will be de-energized after 15 seconds.

• Power will be disconnected from heating element.

• After a minute, Safety Relay will be de-energized.

• Fan Relay will be de-energized after 5 minutes.

• The Drain LED will turn on and the drain valve will open allowing water to drain from the bottom of the chamber.

• The drain valve will remain open for 12 minutes after the water level in the chamber drops below the lower probe.

• The Fill LED will turn on and the Fill valve will open. The Fill valve will remain open until the water in the chamber reaches the upper probe, at which point the ﬁll valve will close and the Fill LED will turn off.

• The humidiﬁer will go into a forced cool-down period, which lasts about 3 ½ hours. During that time, all the LEDs will blink in sequence.

• After the forced cool down period, the Fill LED will turn on – the Fill valve will open, water will ﬂow into chamber until it reaches the upper probe.

• Drain LED will turn on and the drain valve will open allowing water to ﬂow from the bottom of the chamber.

• The drain valve will remain open for 12 minutes after the water level in the chamber drops below the lower probe.

• The Fill LED will turn on and the Fill valve will open.

• When the water in the chamber reaches the lower probe, if there is a demand for humidity, the heating element will be energized.

• The Fill valve will remain open until the water in the chamber reaches the upper probe, at which point the ﬁll valve will close and the Fill LED will turn off.

• NOTE: When the water in the chamber reaches the lower probe, if there is a demand for humidity, the heating element will be energized.

• After 72 hours of no demand for humidity, the Drain LED will turn on and the drain valve will remain open for 10 hours.

• After 10 hours, the Drain LED will turn off and the Drain valve will close.

• The chamber will remain empty until there is a demand for humidity.

SEQUENCE OF OPERATIONS

Note: Sequence is for normal operation, starting with an empty Steam Chamber.

Model 1160 humidifier is connected to: 240 VAC, single phase input power; Model 57 modulating Automatic Steam Humidifier Control (ASHC); Airflow Proving Switch and High Humidity Limit Switch. Water supply is turned on, steam distribution and drain connections are made.

Model 1180 humidifier is connected to: 240 VAC, three-phase input power; Model 57 modulating Automatic Steam Humidifier Control (ASHC); Airflow Proving Switch and High Humidity Limit Switch. Water supply is turned on, steam distribution and drain connections are made.

TABLE 3 – Sequence of operation for Model 1160 and 1180

Operation Expected Results

Humidiﬁer power turned on.

Fill Sequence: Water level probe will sense an empty chamber and turn on the ﬁll valve.

Demand for humidity from control circuit: (ASHC is calling for humidity and airﬂow is present.)

As water is boiled off, the water level drops and the water level probe will sense a need for more water in the chamber.

Pre-heating of water.

Demand for humidity is satisﬁed.

• Internal Controller (LW420) powered up.

• LEDs blink - On/Off LED stays on.

• +24 VDC available at terminal #30 on humidiﬁer referenced to C.

• After a few second delay, the Fill LED will turn on and the ﬁll valve will open. The Fill LED will remain lit as long as the ﬁll valve is open.

• Water will ﬂow into steam chamber. Note: It takes approximately 7 minutes to ﬁll the Model 1160 chamber and 12 minutes to ﬁll the Model 1180 chamber.

• Water level probe will sense a properly ﬁlled chamber and Fill LED will turn off .

• Fill valve will close.

• ASHC will send a DC signal from H+ to terminal #1 on humidiﬁer. The signal will range from 1 to 10 Volts DC depending on the difference between the ASHC set-point and the actual RH.

• The Fan Relay will energize in a few seconds.

• The LW420 will check for a closed ‘enable’ circuit between terminal #2 and C (Airﬂow Proving and High Humidity Limit check).

• If ‘enable’ circuit is closed, Steam LED will turn on and remain on as long as the call for humidity is present.

• The Steam LED will stay on unless the ‘enable’ circuit opens or the ASHC signal drops below 1 VDC.

• After a 15 second delay, the Contactor will close, energizing the heating elements.

• After about ten minutes, the water will boil and steam will be generated and forced out of chamber, up through hose and dispersion tube into the duct.

• CAUTION: Steam chamber and hose will be very hot.

• NOTE: During the initial start-up, steam hose may emit an odor.

• See Fill Sequence listed above.

• During normal operation, in the case of a re-ﬁll cycle or a period of no demand for humidity, the controller will recognize that the tank has cooled down. The heaters will energize for an appropriate amount of time to bring water close to boiling temperature. Preheat only occurs when there is a demand for humidity.

• Steam LED will turn off.

• The contactor will open after 15 seconds and the heating elements will be de-energized.

• The Fan Relay will be de-energized after 5 minutes.

• The Drain LED will turn on and the drain valve will open allowing water to drain from the bottom of the chamber.

• The drain valve will remain open for 12 minutes after the water level in the chamber drops below the lower probe.

• The Fill LED will turn on and the Fill valve will open.

• The Fill valve will remain open until the water in the chamber reaches the upper probe, at which point the ﬁll valve will close and the Fill LED will turn off.

• NOTE: When the water in the chamber reaches the lower probe, if there is a demand for humidity, the heating element will be energized.

continued on next page...

TABLE 3 – Sequence of operation for Model 1160 and 1180 (continued)

Operation Expected Results

• The humidiﬁer will go into a forced cool-down period, which lasts about 6 hours for Model 1160 and 7 hours for Model 1180. During that time, all the LEDs will blink in sequence.

• After the forced cool down period, the Fill LED will turn on – the Fill valve will open,

End of season drain.

water will ﬂow into chamber until it reaches the upper probe.

• Drain LED will turn on and the drain valve will open allowing water to ﬂow from the bottom of the chamber.

• The drain valve will remain open for 12 minutes after the water level in the chamber drops below the lower probe

• The Fill LED will turn on and the Fill valve will open.

• When the water in the chamber reaches the lower probe, if there is a demand for humidity, the heating element will be energized·

• The Fill valve will remain open until the water in the chamber reaches the upper probe, at which point the ﬁll valve will close and the Fill LED will turn off.

• After 72 hours of no demand for humidity, the Drain LED will turn on and the drain valve will remain open for 10 hours.

• After 10 hours, the Drain LED will turn off and the Drain valve will close.

• The chamber will remain empty until there is a demand for humidity.

DISPLAY PANEL AND INDICATOR LIGHTS

The display panel shows operating status and troubleshooting information. See the display panel detail (Figure 6) and the table describing display panel lights (Table 4). For more information about blinking indicator lights, see the troubleshooting section in this manual.

FIGURE 6 – Display Panel

On/Off switch

Steam

Fill Drain On/Off

Indicator light

OM-2028-M

TABLE 4 – Display Panel Light Indications

Indicator light(s) Status Description

All Blinking sequentially

On Power is on. Normal operation.

On/Off (switch)

Drain

Fill

Steam

Note:

See the Troubleshooting section in this manual for more information.

Slow blinking (1/sec.) The electronic water level probe needs cleaning.

Fast blinking (10/sec.) Probe logic fault. See Troubleshooting section.

On The humidiﬁer is draining. Normal operation.

Blinking

On The humidiﬁer is ﬁlling. Normal operation.

Blinking

On The humidiﬁer is making steam. Normal operation.

Blinking

The humidiﬁer is in a forced cool-down period prior to a required automatic drain sequence. Normal operation.

The allowed amount of time for draining has been exceeded. Fault in drain operation. Humidiﬁer will continue to operate. See Troubleshooting section.

The allowed amount of time for ﬁlling has been exceeded. Fault in ﬁll operation. Humidiﬁer will not operate. See Troubleshooting section.

The humidiﬁer has received a demand signal but cannot make steam because:

• There is not enough water in the chamber, or

• An enable/safety switch is open

AUTODRAIN SEQUENCE

The humidifier drains and flushes automatically at regular intervals to remove minerals from the chamber.

After the humidifier has run for a preprogrammed amount of time, and if there is no demand for humidity, the humidifier sits idle until the chamber cools and then it drains.

If the humidifier has not completed an autodrain sequence due to continual demand signal interruptions, after an additional amount of run time the humidifier begins a cool-down period and then it drains.

IMPORTANT: The humidifier attempts to complete an autodrain sequence when there is no demand for humidity. However, if an autodrain sequence is not completed within a defined period of time, the humidifier ignores the demand signal until completing an autodrain sequence. This could cause the relative humidity level in the humidified space to drop until the autodrain sequence completes.

INSTALLATION

FIGURE 7 – Model 1150 Wiring Diagram

APRILAIRE STEAM HUMIDIFIER MODEL 1150

SINGLE HEATER WIRING DIAGRAM

ON/OFF CONFIGURATION

AA-LW420-1

FIGURE 8 – Model 1160 Wiring Diagram

APRILAIRE STEAM HUMIDIFIER MODEL 1160

DUAL HEATER WIRING DIAGRAM

MODULATING CONFIGURATION

AA-LW420-2

FIGURE 9 – Model 1180 Wiring Diagram

APRILAIRE STEAM HUMIDIFIER MODEL 1180

THREE HEATER WIRING DIAGRAM

MODULATING CONFIGURATION

AA-LW420-3

SETTING SLIDE SWITCHES

IMPORTANT: Slide switch on-off positions 1 through 16 are preset at the factory. These settings are determined by output capacity, water type, and demand signal type. Changing these settings will affect humidifier operation. Change on-off positions only per the instructions in this manual or as instructed by Aprilaire technical support staff.

On the internal controller inside the humidifier, there are two banks of slide switches. Most are set at the factory according to the model type. Others, however, must be set according to the details of each particular installation. See Figure 10. Note: the ‘Off’ slide switch position is to the left while the ‘On’ slide switch position is to the right. For wiring details see page 27.

Type of Control Input

Model 1150 with an on/off control: S1 slide switch positions 1 and 2 Off Model 1160/1180 with modulating control: S1 slide switch positions 1 and 2 Off Model 1160/1180 with 0-10 VDC signal by others: S1 slide switch positions 1 and 2 Off Model 1160/1180 with 4-20 mA signal by others: S1 slide switch positions 1 and 2 On

Inlet water type

The controller allows autodrain settings for three water supply types:

• Normal water (hardness greater than 4 and less than

FIGURE 10 – Slide Switches

10 grains/gallon)

• Hard water (hardness greater than or equal to 10 grains/gallon)

• Softened water (hardness less than or equal to 4 grains/gallon)

Position

Type of control input

Water type

The humidifier is preprogrammed for use with normal water. If your water supply is hard or softened, follow the instructions below:

• For hard water supply (greater than or equal to 10 grains/gallon of hardness): – Set switch S1 position 3 to On; position 4 remains Off.

Factory use only

Remote alarm or fan/blower control

Factory use only

See Figure 10.

LED lamp

Mounting hole

• For softened water supply: – Set switch S1 position 4 to On; position 3 remains Off.

See Figure 10.

Substituting a remote fault alarm for blower starting

The humidifier may be field programmed to send a fault alarm signal to a remote device instead of sending a signal to start the HVAC equipment blower.

Note:

Slide switches are shown in the off position.

Internal Controller Board

To enable this function, set slide switch S2 position 9 to On and provide wiring to control terminals NO, O, and NC. See Figure 10 for slide switch positions.

If you change any on-off settings, record them in Table 5 for future reference.

OM-2038

+ 33 hidden pages