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ELECTRONIC HUMIDISTAT: H270

• ONE OR TWO STAGES

• HUMIDITY SUPPLY HIGH LIMIT

• OUTDOOR TEMPERATURE RESET

DESCRIPTION

The H270 series low voltage, microcomputer-based PI

(proportional and integral) humidistats are designed for

accurate humidification and/or dehumidification control

in commercial applications such as: hospitals, schools,

office buildings, retail stores, museums, computer

rooms, etc.

The H270 series is available with one or two outputs

for maximum flexibility. Outputs can be of the following

type: proportional, on/off, and pulse width modulation

(PWM). Two additional inputs are provided in order to

perform unique functions: humidity setpoint reset

based on outdoor air temperature and proportional

high limit override. The former function minimizes

condensation on window surfaces during cold outdoor

temperatures by automatically lowering the humidity

setpoint as the outdoor temperature drops. The latter

function improves accuracy and safety by throttling

back the humidifier control output if the humidity level

reaches unacceptably high levels.

There are many different types of mounting

configurations available. Sensing options include

remote duct and room as well as integral room and

duct. Setpoint adjustment can be either concealed or

exposed, adding even more versatility to the product.

Exposed models feature internally selectable minimum

and maximum setpoint knob stops.

In order to facilitate periodic recalibration, the H270

series contains a unique autocal key, which permits

instant recalibration (see dimension drawing on page 5

for location).

Each humidistat is computer calibrated and factory

programmed with default parameters. All control

parameters (such as proportional band, stage

differential, etc.) may be changed in the field with the

H263 programming tool without having to remove the

thermostat cover. The H263 also doubles as a

diagnostic tool and indicates the status of all the inputs

and outputs, and will reduce troubleshooting time by

quickly identifying the specific problem.

Fig.1 Wall mounted humidistat

Features Benefits

• Microcomputer-based design with PI algorithm ⇒

Exceptional accuracy

• One or two outputs ⇒

Controls humidification and dehumidification equipment

• On/off and/or proportional outputs ⇒

Greater flexibility

• Direct or reverse acting outputs ⇒

Controls humidification and dehumidification equipment

• Integrated and remote sensing ⇒

Larger choice of mounting options

• Autocal button ⇒

Permits instant recalibration

• Concealed or exposed set point ⇒

Can be used in a large variety of environments

• Ouput signal to digital indicating devices ⇒

Increases functionality of product

• Optional H263 diagnostic tool with digital display ⇒

Simplifies troubleshooting

• Sensor failure protection ⇒

Prevent water dammage

• Humidity setpoint reset based on outdoor temp. ⇒

Prevents window condensation in colder climates

• Proportional high limit override ⇒

Prevents costly damage due to over-humidification

• CE approved ⇒

Can be sold in European markets

Summary of content (7 pages)

PAGE 1
ELECTRONIC HUMIDISTAT: H270 • ONE OR TWO STAGES • HUMIDITY SUPPLY HIGH LIMIT • OUTDOOR TEMPERATURE RESET DESCRIPTION instant recalibration (see dimension drawing on page 5 for location). The H270 series low voltage, microcomputer-based PI (proportional and integral) humidistats are designed for accurate humidification and/or dehumidification control in commercial applications such as: hospitals, schools, office buildings, retail stores, museums, computer rooms, etc.
PAGE 2
TABLE 1: ORDER CODE H270 - A-B - C-D WIRING - E-F A 1 4 5 6 Output no. 1 ( controlled device ) ON/OFF (15 min. time based) (PWM) 24 VAC (PWM) 5 VDC Analog 0-10 Volts DC B 0 1 4 5 6 8 Output no. 2 ( controlled device ) Not installed ON/OFF (15 min. time based) (PWM) 24 Volts AC (PWM) 5 Volts DC Analog 0-10 Volts DC Signal transmitter (0-10 VDC) (1V= 10% , 9V-90%) Signal transmitter (0-5 VDC) (0.5V= 10% ; 4.5 V=90%) 9 2 ON/OFF OUTPUTS G-H C 1 2 3 4 Output no.
PAGE 3
2 PROPORTIONNAL OUTPUT OUTPUT #2 0 to 10 Vdc 1 2 + - OUTPUT #1 0 to 10 Vdc 3 4 + - 24 Vac COMMON MAIN SENSOR INPUT N/A N/A +10 Vdc 5 6 ELECTRONIC MOTOR or "SCR" ELECTRONIC MOTOR or "SCR" 1 PROPORTIONNAL AND 1 TRANSMITTER OUTPUT OUTPUT #2 0 to 5 Vdc 0 to 10 Vdc TRANSMITTER 1 2 + - OUTPUT #1 0 to 10 Vdc 3 4 + - 24 Vac 24 Vac 7 COMMON BLACK HUMIDITY SENSOR WHITE RED 8 9 10 Fig.
PAGE 4
TABLE 2: HUMIDISTAT ACCESSORIES H50 Internal humidity sensor for H270 humidistat and for H80 remote wall sensor. H60 Duct humidity sensor to mount directly onto the back of any H270 humidistat. H71 Duct humidity sensor to mount directly onto the supply or return of the ventilation duct. H80 Wall humidity sensor to mount in any remote location. S71 Outdoor temperature sensor to lower the setpoint in cold season.
PAGE 5
CONTROL SCHEMATIC: SET POINT 100% 100% OUTPUT #2 DEHUMIDIFICATION OUTPUT #2 HUMIDIFICATION 0% 0% d2 d2 100% 100% OUTPUT #1 HUMIDIFICATION OUTPUT #1 DEHUMIDIFICATION 0% 30% 35% 40% 45% pb Fig.
PAGE 6
TABLE 3: H263 HUMIDISTAT PROGRAMMING TOOL CODE VALUES DEFAULT VALUE DESCRIPTION Db 0 to 40 % R.H. 25% R.H. Dead Band between humidification and dehumidification. SL 30 to 100 % R.H. 85% R.H. Supply Limitation: High humidity limit in the supply duct (H270 only) d2 0 to 199 % (of proportional band) 100% Differential for output #2": Shift for output 2 relative to output 1 Pb 0 = 1.6 % R.H. 1 = 3.2 % R.H. 2 = 6.4 % R.H. 3 = 12.8 % R.H. 4 = 25.6 % R.H.
PAGE 7
AUTOCAL PROCEDURE SENSOR FAILURE PROTECTION 1. Measure the room humidity near the Viconics humidistat with an accurate hygrometer. 2. Turn the humidistat set point dial to match the reading of the hygrometer. Push and hold the Autocal button for more than 3 seconds or until the internal red light turns On and Off. The sensor is the most sensitive part of the humidistat and also the most exposed.