Heater plate triac circuit faulty. E30 Power (on/off) button stuck on E31 Mute button stuck on E32 Mode button stuck on E40 Unit not functional tested at time of manufacture MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal) Error Description of Fault E41 Failed the functional test at time of manufacture E42 Was not stress tested during manufacture E43 Failed the stress test during manufacture E44 Not tested on functional tester 2 E45 Failed producti

................................................................................................................................................................................ AIRFLOW PROVING SWITCH INSTALLATION INSTRUCTIONS Description: FIGURE 20 The airflow proving switch is a safety device that will prevent the humidifier from producing steam when there is no airflow present in the HVAC system. The switch is a pressure differential measuring device that determines if there is airflow present

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Materials Provided and Not Provided . . . . . . . . . . . . . . . . . . 3 Electrical Specifications, Capacities and Weights . . . . . . . . 4 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Overview of Humidifier Operation . . . . . . . . . . . . . . . . . . . . . 7 INSTALLATION Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Setting Slide Switches. . . . . .

Otherwise if a heater wire is not connected then the optoisolator will be turned on and off in synchronisation with the secondary cycle. The output of the optoisolator feeds U4 on the control board. This signal, with processor interpretation, provides the information to determine if the Heater Wire is connected or open circuit and also the integrity of fuse F2, the 4 A fuse supplying power to the Heater Wire. Q11 controls power to the heaterplate and is under control of optoisolator U12 and tran

25 8.6 Circuit Diagrams - Revision H and J PCB Power PCB ...................................................................................................... 26 8.7 Circuit Diagrams - Revision F PCB Control PCB..............................................................................................................27 8.8 Circuit Diagrams - Revision F PCB Power PCB ................................................................................................................ 28 8.9 Electri

Ceramic 22 nF 50 V.............................................................................. 312040116 C22, C23 Cap. Mylar 10 nF 50 V................................................................................. 316040084 C21, C24 Cap. Ceramic 470 pF 50 V............................................................................ 312040118 D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 Diode 1N4148.........................................................................................

• To upgrade both PCBs and the software use a PCB service upgrade kit. The part numbers to order are as follows: Model Part number Model Part number MR480 043040791 MR720 043040793 MR700 043040792 MR730 043040794 • For humidifiers with Rev F or later PCBs, you will only be required to purchase individual boards for repairs (as detailed in sect. 8.9). • If a revision H or later power PCB needs replacing, the replacement power PCB must also be revision H or later. Replacing revision F or earlier p

Slip drain line back onto the drain fitting. Make sure the drain line has a constant downward slope and is not flattened or blocked. 10. Turn on the water supply. Return integral bypass damper to appropriate position. 11. Check system operation: Manual Humidifier Control (Models 500M & 600M): With the HVAC blower operating, turn up Humidifier Control and check system operation. Digital Humidifier Control (Models 500 & 600): (Automatic or Manual mode) Check system operation and reset Change Water

• Simple operation with few adjustments. The Control eliminates the need to manually adjust the control when outdoor temperature changes. It also eliminates the need to turn the dial setting to “OFF” during the summer season. DIGITAL HUMIDIFIER CONTROL INDICATOR LIGHTS Call Dealer for Service: The red light indicates that the humidifier is not operating normally and that service is required. Change Water Panel: The yellow light indicates that it is time to change the Water Panel in the humidifie