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Hersteller: Armstrong World Industries Dateigröße: 618.74 kb Dateiname: Unterrichtssprache:

• Avoid areas of restricted air circulation, or locations where the sensor will be subjected to air drafts, localized heat, or moisture sources. • Locations near coffee machines, computer blower outlets, doors to other rooms, or windows that can be opened are not suitable. 10 Figure 11-1 On-Off Humidistat 1.9 - 3.9 Vdc Switch Opens on RH Rise Voltage Source Ground Stat In N/C 2 17 1 20 White Black Voltage Source Ground Stat In N/C Green Part No. C1471 or C1472 2 17 1 20 Brown Orange Part No. A8581 or A8581A Set BJ4 Stat Input Selector to 1.9 - 3.9 Vdc Set BJ4 Stat Input Selector to On/Off Set BJ5 Voltage Source to 12 Vac Set BJ5 Voltage Source to +5 Vdc 4-20 mA & 0-10 Vdc Setting* 0-135 . Ohm Potentiometer Voltage Source Voltage Source Ground Ground Stat In Stat In N/C N/C 2 17 1 20 - + 2 17 1 20 Part No. A6707A or A18611 Humidity Increase Set BJ4 Stat Input Selector to Set BJ4 Stat Input Selector to 0-135 Ohm 0-10 Vdc or 4-20 mA Set BJ5 Voltage Source to +5 Vdc *See Figure 10-1 for Armstrong 0-10 Vdc Humidistat Connections Duct Mounted Control Humidistat: Duct-mounted control humidistats are also available for installation where sensing and control of return air or exhaust air ducts is preferable. (Figure 10-1) Please refer to manufacturer's recommendations for further information on the location, mounting, and operation of the various control humidistats. 10) HIGH LIMIT DUCT HUMIDISTAT Remove the jumpers tab from terminals 10 & 14 and wire the high limit stat between these terminals. Refer to Figure 10-1 and Figure 11-1 (the overall wiring diagram) for more information. A duct mounted high limit humidistat is recommended to prevent over-saturation of the duct air. Use an on-off controller that opens on fault (high humidity). Humidistat should be set for a maximum of 90% RH. Alternately, a modulation high limit humidistat may be used on applications such as variable air volume (VAV). Locate the high limit humidistat approximately 10' (3m) downstream of the dispersion manifold. If 10' (3m) is not available, consult the factory. 11) AIRFLOW SWITCH An airflow switch is recommended to deactivate the humidifier when there is insufficient air flow in a duct system. A duct pressure switch is preferred as an airflow sensor. The pressure switch should open on insufficient airflow (opens on fault). Airflow switch should be mounted in supply air duct upstream of humidifier dispersion. Remove the jumper tabs between terminals 9 & 15 and wire the airflow sensor between these terminals. See Figure 11-1 and Figure 12-1 (the overall wiring diagram) for more information. Complete installation and wiring instructions are contained in the duct pressure switch package. NOTE: LIMIT SWITCHES (HIGH LIMIT AND AIRFLOW SWITCHES) OPEN ON FAULT. 11 Figure 12-1 Main Control Humidistat High Limit* Humidistat Air Flow* Switch *Must be closed to run Micro Controller Printed Circuit Board N.O. Alarm Relay 24 V Secondary Power Transformer Side 1 Side 2 24 VAC Drain Valve A High Water Switch A 24 VAC Fill Valve Current Transformer Steam Generator A 24 VAC Contactor High Voltage Terminals LED Display Three-Digit Numerical Display Panel Switches Drain On/Off Tank On/Off Mode SelectLow-Voltage Low-Energy Controls 12) AUDIBLE ALARM There is an external alarm circuit provided. When an alarm condition is detected in the diagnostic routines, a relay contact closes allowing activation of an external Class II device connected between terminals 27 & 28. This circuit is rated to 1 amp. 12 INSTRUMENT PANEL The Mode select button is depressed for approximately . second to switch both the "display mode selected" indicator and the 3 MODE BUTTON, digit display between: INDICATOR, -DEMAND-% of humidistat control range. and DISPLAY -CURRENT-actual current in amps. -% POWER-ratio of current draw to the nominal rating of the unit. -DIAGNOSTIC MODE-readout of diagnostic codes. Leaving the display in the diagnostic mode for 10 seconds initiates the input/output diagnostic routine (see Diagnostics pg. 20). The 3 digit display also exhibits a diagnostic code in the event that the unit has shut down automatically. DEMAND CURRENT % POWER DIAGNOSTIC FILL DRAIN HIGH WATER TANK OFF MODE SELECT TANK ON/OFF DRAIN ON/OFF FILL LIGHT Indicates when the fill valve is energized to add water to the steam generator. DRAIN LIGHT Indicates when the drain valve is energized to drain water from the steam generator. HIGH WATER LIGHT Indicates that the water level in the generator has risen to the high water level. TANK OFF LIGHT Indicates when power to the generator has been interrupted (tank contactor open). TANK ON/OFF Depressing the tank on/off button for . second will open the tank contactor. The tank off light and the diagnostic light will be on and the display will show the message CO8. The unit will stay in this mode until the button is pressed again. MANUAL DRAIN Depressing the manual drain button for . second will open the drain BUTTON valve. The tank will continue to drain...

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