DriSteem DS 301 Guía de configuración

Safety, Installation, and Operation Manual

DRISTEEM Duct Mounted On-Off Humidistat (DS 301)

and Duct Mounted Modulating Humidistat (DS 401)

READ COMPLETE INSTALLATION INSTRUCTIONS BEFORE STARTING.

WARNING

1. Contact with energized electrical circuits may cause serious injury

from electrical shock. Disconnect electrical power to the 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 or moisture can

accumulate, which may cause bacteria and mold growth or dripping

water into building spaces. Dripping water may cause property

damage; bacteria and mold growth may cause illness.

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 Humidistat on supply plenum or duct. High supply

temperatures will cause the control to malfunction.

4. When installing Humidistat on downflow furnaces, ensure that

blower continues to run as programmed after a heat call is satisfied

to eliminate high temperatures from damaging the Humidistat.

THESE INSTALLATION INSTRUCTIONS ARE FOR THE HUMIDISTAT ONLY!

For DRISTEEM®Humidifier installation, follow DRISTEEM Humidifier Installation Instructions.

PRINCIPLES OF OPERATION

The DRISTEEM Duct Mounted On-Off Humidistat (DS 301) and Duct

Mounted Modulating Humidistat (DS 401) are designed to be installed in

the return duct or return plenum only of the HVAC system. 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 DRISTEEM Duct Mounted On-Off

Humidistat (DS 301) and Duct Mounted Modulating Humidistat (DS 401) will

accurately control the humidity in the conditioned space within the range of

15% – 55% RH.

CONTROL TYPE

ON-OFF CONTROL

The DRISTEEM Duct Mounted On-Off Humidistat (DS 301) 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 Humidifier is either on at 100% capacity or it is off.

MODULATING CONTROL

The DRISTEEM Duct Mounted Modulating Humidistat (DS 401) 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 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

90-890

FIGURE 3 –Split System Installation

OM-4016

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

HUMIDISTAT

Supply DuctReturn Duct

FIGURE 2 –Rooftop Unit Installation

90-894

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: DETERMINE LOCATION FOR CONTROL

AND MOUNT ON DUCT

INSTALLATION

The Control must be mounted in the return duct of the HVAC system.

See Figure 2 for a rooftop unit installation and Figure 3 for a split-system

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).

Above expected

snow line

Outdoor

Temperature

Sensor leads

North, East

or West side

of building

Outdoor

Temperature

Sensor

Bracket

FIGURE 4 –Outdoor Temperature Sensor Location

STEP 2: 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 4)

Incorrect humidity levels will result if these requirements are not met.

Attach the sensor bracket to the building with a #8 galvanized screw.

STEP 3: 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 4: 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 5.

If it is not feasible to use the Outdoor Temperature Sensor in any of the

ways described, the Humidistat can be set for Manual Operation. See

Figure 6 for details.

90-895

STEP 5: ROUTE THE WIRE TO CHOSEN

SENSOR LOCATION

Run wire to the outdoor temperature sensor. Sensor is not affected by lead

length up to 300 feet. Use standard thermostat wire. Do not run outdoor

temperature sensor alongside wires carrying high voltage (120 VAC

or higher).

36" MAX.

CENTER

LINE

OUTSIDE WALL

FRESH AIR INTAKE

FIGURE 5 –Alternate Location for Outdoor

Temperature Sensor

90-896

STEP 6: ATTACH SENSOR WIRE TO HUMIDISTAT

Strip wires 1/4 inch, and insert the wires from the Sensor into the terminals

labeled “ODT”on the Humidistat.

INSTALLING THE HUMIDISTAT FOR

MANUAL OPERATION

1. Insert the Manual Mode Resistor Case into the terminals

labeled “ODT” on the Humidistat.

2. Snap the Manual Mode Resistor Case into the slot

provided so that Resistor Case sticks out from the bottom

edge of the base.

3. Remove the control knob and apply the Manual Mode

label to the cover, aligning the sticker and knob holes.

Re-install the knob.

912

H- ODTI+ I- C24V H+

R17

FIGURE 6 –Manual Mode

90-899

STEP 7: WIRE THE CONTROL TO THE HUMIDIFIER

Wire the Control to the field wiring terminal block of the Humidifier

according to Figure 9. Use 3-wire shielded cable with ground for the wiring

from the Control to the Humidifier. Note the terminal designations below.

HUMIDISTAT:

24V +24 VDC input power

CCommon

H+ Command Signal to Humidifier

ODT Outdoor Temperature Sensor

HUMIDIFIER:

30 +24 VDC output power

CHumidifier Common

1Command Signal from Control

2Enable/Safety Circuit

I+ I- H-

30 C1

24V C H+ ODT

3-WIRE SHIELDED

CABLE W/GROUND

HUMIDIFIER PANEL

C TERMINAL*

COMMAND

SIGNAL

+24VDC COMMON

TO OUTDOOR

TEMPERATURE

SENSOR

SERIAL COMMUNICATION

TO THERMOSTAT (OPTIONAL)

HUMIDISTAT

HUMIDIFIER

FIELD WIRING

TERMINAL

BLOCK

FIGURE 7 –Wiring Diagram

90-900

SYSTEM CHECKOUT

OPERATION

1. For system test, be sure that all Humidifier plumbing, distribution, and

electrical connections are set-up in accordance with the instructions in

the Humidifier Installation, Operation, and Maintenance Manual and all

precautions therein are followed.

2. Turn on the water supply to the humidifier. Make sure the drain valve

is closed.

3. Turn on power to the humidifier.

4. Allow humidifier to fill with water.

5. Set up a fan call at the thermostat. If the humidifier is configured to

bring on the equipment fan when a demand for humidity is recognized,

skip to the next step.

6. Initiate a humidity demand from the Control by rotating the control knob

of the Humidistat clockwise to the ‘Test’position.

7. If all is set up properly, the ‘Steam’indicator light on the humidifier will

illuminate and the heaters will be energized. In the ‘Test’position, the

humidity demand will last for one minute.

8. If the ‘Steam’indicator light does not illuminate when the Control is

turned to the ‘Test’position, refer to the troubleshooting section of

this manual.

9. Setting the Control:

•If using Automatic Mode and the conditioned space is occupied,

set the Control to knob-setting 4.

•For Manual Mode and the conditioned space is occupied, set to 35%

or to a level that matches the application’s needs.

•If the conditioned space is unoccupied, set the Control to ‘Off’

For information on the initial adjustment period, refer to the operation

notes in the next section.

10.Make sure the Red Diagnostic Light on the Control (see Figure 8) is not

lit. If the Red Diagnostic Light is lit, re-check the wiring. If the Red

Diagnostic Light does not go off, refer to the troubleshooting section of

this manual. Note that the Red Diagnostic Light will turn on momentarily

when first powered up.

CAUTION

A high relative humidity setting on the Control may cause

excessive condensation on windows and within walls. Set the

relative humidity in accordance with the instructions in this manual.

Do not set the relative humidity higher than recommended or

moisture can accumulate, which may cause bacteria and mold growth

or dripping water into building spaces. Dripping water may cause

property damage; bacteria and mold growth may cause illness.

R17

H+24V CI-I+ ODTH-

129

6JP2

123

FIGURE 8

Red Diagnostic

Light

90-891

*C Terminal –for location drawing please reference Figure 9-1 in the VT

Series Electric Humidifier Installation, Operation and Maintenance Manual.

OPERATION NOTES FOR MODULATING CONTROL

As explained in the ‘Principles of Operation’section of this manual, when

configured for modulating control, the Humidistat sends a 0-10V signal to

the humidifier to vary the capacity of the Humidifier depending on where

the measured return air relative humidity falls relative to the set-point as

well as the proportional control band. This will result in a more precise

control of relative humidity.

The proportional control band can be set to

6%, 9%, 12%, or 15% RH. The factory-

setting is 12%. Note that the proportional

control band is centered on the RH set-point.

Refer back to Figure 1. If the humidifier is

cycling on and off too frequently, the

proportional control band setting may need to

be widened. To change, use a small flat-head

screwdriver to rotate the potentiometer in the

Humidistat board. See Figure 9.

912

FIGURE 9

90-901

AUTOMATIC MODE OPERATION NOTES

The Humidistat is installed in

the return duct. During the first

heating season, the

Humidistat needs to be

adjusted to match the

requirements and construction

of the conditioned space.

Please follow these steps

when adjusting the Control

(refer to Figure 10).

AUTOMATIC MODE

FIGURE 10

90-902

Turn the dial to a setting of “4”. At this setting, when the Outdoor Temperature

is 20°F, the indoor relative humidity set-point of the Humidistat will be 35% RH.

During the next 24-48 hours, it may be necessary to adjust the dial for more

or less humidity, depending on the occupants’comfort and the requirements

of the conditioned space. Refer to the ‘Operation Guide’(Table 1).

During the coldest portion of the first heating season, minor adjustments may

be necessary. This is dependent upon the unique features and construction of

the conditioned space. Refer to the ‘Operation Guide’(Table 1).

TABLE 1: Operation Guide

Condition Solution

Condensation on windows. Reduce the setting on the control

dial by 1 increment.

Lack of humidity. Increase the setting on the control

dial by 1 increment.

The relative humidity in the conditioned space will now be accurately

controlled and should need no further adjustment during future heating

seasons. Make note of the dial setting in the event the knob is temporarily

moved when performing annual maintenance of the Humidifier.

Table 2 shows the way the Humidistat automatically adjusts the relative

humidity based on the outdoor temperature. For example, when the knob is

set to “4”and the outdoor temperature is 20°F, the conditioned space will

be controlled to 35% RH.

TABLE 2: Relative Humidity Guide

Outdoor Temperature (°F)

-20 -10 0 10 20 30 40 50

1–––10 15 20 25 30

2––12 17 22 27 32 37

3–13 18 23 28 33 38 43

415 20 25 30 35 40 45 50

522 27 32 37 42 47 52 55

628 33 38 43 48 53 55 55

735 40 45 50 55 55 55 55

Dial Setting

MANUAL MODE OPERATION NOTES

The Humidistat is installed in the return duct. When installed in the Manual

Mode, the Control provides specific set-point control. If the building is not

designed to handle the amount of RH the humidifier is supplying, the RH

setting on the Control may need to be adjusted to a lower value during

extreme days to prevent

condensation on interior

surfaces. For example, with an

outdoor temperature of 20°F

the correct setting will be

35% relative humidity. If the

temperature is expected to fall

to 0°, then reduce the setting

to 25% several hours prior to

the temperature change. It is

important to adjust the RH

setting upward when the

outdoor temperature goes

back up again.

MANUAL MODE

FIGURE 11

90-904

The recommended settings on the humidistat are based on years of research

for an average building. (See ASHRAE Handbook – HVAC Systems and

Equipment, Ch. 20 –Humidifiers.) Note: these settings may not be appropriate

for every application. These settings represent a compromise between RH levels

that would be most desirable for comfort reasons and humidity levels that are

suitable for protection of the conditioned space and to avoid condensation on

windows and within walls. For example, a wintertime indoor RH of 50% may

be considered ideal for comfort, but unfortunately, it probably would result in

damage to the conditioned space. Observance of the recommended RH levels

on the humidistat, therefore, is an important safeguard. Condensation of

water on inside windows in the form of fogging or frost is an indication of too

much relative humidity. This same condensation can occur in other areas of

the conditioned space with the possibility of damage resulting.

TABLE 3: Outdoor–Indoor Relative Humidity

Outside Temperature

+40˚F

+30˚F

+20˚F

+10˚F

0˚F

-10˚F

-20˚F

Recommended RH

45%

40%

35%

30%

25%

20%

15%

Applies to both Automatic and Manual Operation unless indicated otherwise.

Humidifier does not

operate in “Test”mode

•Make sure equipment blower is operating and thermostat is calling for heat.

•Make sure the Outdoor Temperature Sensor is connected to the “ODT”terminals of the control.

(For Manual Operation, make sure Manual Mode Resistor Case is in place of the Sensor).

•Check main wiring diagram for correct Humidistat installation.

•Check voltage at Humidistat “24V”and “C”terminals. Voltage should be 22 VDC minimum –26 VDC maximum.

•In “Test”mode, humidifier will operate for 1 minute only. DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE.

•Make sure water supply valve is open.

•If humidifier still does not operate, refer to the Humidifier Installation, Operation, and Maintenance Manual.

SYMPTOM TROUBLESHOOTING PROCEDURE

Humidifier operates

constantly

•If the humidity level in the building is less than the knob setting or is within the proportional control band (DS 401 only), the

Humidistat will operate the humidifier until the humidity level is higher than the knob setting.

•In the “Test”mode, verify unit will operate for approximately one minute.

•Check the resistance of the sensor by removing the wires of the Outdoor Temperature Sensor and measuring the resistance

across the wires with an ohmmeter. Confirm reading to outdoor temperature in Table 4. (For Manual Operation, verify that

resistance across the leads of Resistor Case is between 44,000 and 48,000 ohms.)

•Make sure the Outdoor Temperature Sensor is mounted completely outside the building on the North, East, or West side of

the building and out of direct sunlight. (Automatic Mode Only).

•Rotate the Humidistat knob counterclockwise to the “Off”position, and observe whether the humidifier turns off (‘Steam’

indicator light on the humidifier should go off). If the humidifier still operates in the “Off”position, check summary wiring

diagram for correct Humidistat installation.

•If humidifier still does not shut off, refer to the troubleshooting section in the Humidifier Installation, Operation, and

Maintenance Manual.

Humidifier or Humidistat

“chatters”or clicks ON

and OFF rapidly

•Check voltage at Humidistat “24V”and “C”terminals.

Voltage should be 22 VDC minimum –26 VDC maximum.

•Make sure Outdoor Temperature Sensor wiring is not run alongside wires carrying high voltage (120 VAC or higher).

(Automatic Only)

Red Diagnostic Light is on •Check that the wiring is correct. See Figure 7.

•Measure the resistance of the Outdoor Temperature Sensor by removing the leads from the terminal and measuring

the resistance across the wires with an ohmmeter. Confirm the reading with the temperature in Table 4.

(For Manual Operation, verify that the resistance across the leads of the Manual Mode Resistor Case is between

44,000 and 48,000 ohms).

Humidifier operates only

in “Test”mode

•If outdoor temperature is greater than 60°F or less than -30°F, the Humidistat will only

operate in the “Test”mode. (Automatic Mode Only)

•If the humidity level in the building is higher than the knob setting or the proportional

control band (DS 401 only), the Humidistat will not operate the Humidifier.

•Check the resistance of the sensor by removing the leads of the Outdoor Temperature

Sensor from the terminals and measuring the resistance across the wires with an

ohmmeter. Confirm reading to outdoor temperature in Table 4. (For Manual Operation,

remove leads and verify that resistance across the leads of Manual Mode Resistor Case

is between 44,000 and 48,000 ohms).

•Make sure the Outdoor Temperature Sensor is mounted completely outside the building on the

North, East, or West side of the building and out of direct sunlight. (Automatic Mode Only)

•If Outdoor Temperature Sensor is mounted in fresh air intake duct, make sure the probe is

no more than 36 inches from the outside wall. (Automatic Mode Only)

•Make sure the Outdoor Temperature Sensor is located at least 3 feet away from all

exhaust vents. (Automatic Mode Only)

Outdoor

Temperature

-30˚F

-20˚F

-10˚F

0˚F

10˚F

20˚F

30˚F

40˚F

50˚F

60˚F

70˚F

80˚F

90˚F

100˚F

Resistance

kΩ

230.6

163.8

117.6

85.4

62.6

46.3

34.6

26.1

19.9

15.3

11.9

9.4

7.4

5.9

TROUBLESHOOTING GUIDE

TABLE 4

WARNING

Sharp edges on the opening may cause cuts. Use care when cutting the plenum opening

and installing the Humidistat.

CAUTION

•Do not mount Humidistat on supply plenum or duct. The unit will not withstand supply

temperatures and will malfunction!

•When installing Humidistat on counterflow furnaces, ensure blower continues to run after

a heat call is satisfied to eliminate high temperatures from damaging the Humidistat.

•Do not mount Humidistat downstream of the bypass outlet. False humidity conditions will

cause humidifier to operate incorrectly.

1. CUT TEMPLATE ALONG DASHED LINE.

2. PLACE THIS TEMPLATE ON THE RETURN PLENUM UPSTREAM OF (BEFORE) THE

DISPERSION TUBE.

3. TRACE THE OUTSIDE EDGES OF THIS TEMPLATE.

4. REMOVE TEMPLATE AND ACCURATELY CUT THE PLENUM OPENING.

5. USING 4 SHEET METAL SCREWS, INSTALL HUMIDISTAT IN PLENUM OPENING.

HUMIDISTAT

TEMPLATE

CUT ALONG DASHED LINE

For more information

www.dristeem.com

[email protected]

Technical support

800-328-4447

DRISTEEM Corporation

An ISO 9001: 2000 certified corporation

and a subsidiary of Research Products

Corporation

U.S. Headquarters:

14949 Technology Drive

Eden Prairie, MN 55344

800-328-4447

952-949-2415

952-229-3200 (fax)

European office:

Bell Place, Bell Lane

Syresham, Brackley

NN13 5HP, UK

+44 1280 850122 (voice)

+44 1280 850124 (fax)

E-mail: [email protected]

Continuous product improvement is a

policy of DRISTEEM Corporation;

therefore, product features and

specifications are subject to change

without notice.

DRISTEEM is a registered trademark of

DRISTEEM Corporation and is filed for

trademark registration in Canada and

the European community.

Form No. DSDH-IOM-1204

CUT ALONG DASHED LINE

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