White Rodgers 21D28-6 Installation Instructions
Contents
1. case Non metallic enclosure does not provide ground ing between conduit connections Use grounding bushings and jumper wires to ensure proper grounding of control 6 After wiring is run into case bend the wires out slightly so that the wires will be in front of the panel assembly when it is installed 7 Loosen the three panel mounting screws in the case approximately one turn Slide the two slots located at the top of the panel assembly under the two mounting screws at the top of the case Lower the panel assem bly into the case until the bottom mounting screw protrudes through the keyhole slot on the panel Slide the panel assembly up toward the top of the case then hold the panel assembly in place while tightening all three mounting screws Do not over tighten panel mounting screws to avoid damage to the panel assembly 8 Connect wires to proper terminals see fig 4 for typical wiring connections Do not press against panel assembly while tight ening terminal screws to avoid damage to the panel assembly 9 Replace cover and test operation per the checkout section WIRING To prevent electrical shock and or equipment damage disconnect electric power to system at main fuse or circuit breaker box until installation is complete All wiring should be done in accordance with local and national electrical codes and ordinances 120 VAC DIAGRAM 1F51 619 or 1F51W 619 THERMOSTAT vi UMP MOT2. remove electrical knockouts from case before mounting NOTE If the larger knockout is to be removed remove the smaller knockout before removing the larger one 4 To remove the knockouts place a screwdriver on the knockout at the location indicated by the arrow see fig 3 Tap the screwdriver to pop the knockout out of the case If the knockout is not completely removed carefully use pliers to twist the knockout until it comes out Combined Total Connected Load 16 FLA 120 VAC 8 FLA 240 VAC Mounting Four i32 Dia holes 2 1i x 5 center line to center line Dimensions 6 wide x 8 high x 3 deep Line connections 8A18Z 2 Low voltage Pum Amp transformer connections Pump relay Low voltage thermostat connections Fan connections Fan timer relay Figure 1 Panel assembly Flat washers Mounting holes for four bolts y and washers Panel mounting Figure 3 Electrical knockouts INSTALLATION cont d 5 Select an appropriate location for mounting the con trol Position the case on a smooth flat surface in a vertical position only with electrical knockouts down Mount the case using flat washers and screws not provided through the four mounting holes in the back of the case NOTE Install conduit then run wiring and install the thermostat according to thermostat installation instructions included with thermostat before installing panel assembly in
3. 8A18Z 2 Evaporative Cooler Control INSTALLATION INSTRUCTIONS Operator Save these instructions for future use FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND OR PROPERTY DAMAGE DESCRIPTION This Evaporative Cooler Control has a rain proof enclo sure and can be used with either 120 VAC or 240 VAC systems It was designed for use with White Rodgers 1F51 619 1F51W 619 or 1D51W 632 Thermostats to provide automatic temperature and ventilation control and remote fan speed selection of an evaporative cooler with 2 speed fan The pump relay is automatically oper ated to allow wetting of cooler pads before starting fan White y Rodgers PRECAUTIONS Ifin doubt about whether your wiring is millivolt line or low voltage have it inspected by a qualified heating and air conditioning contractor electrician or someone familiar To prevent electrical shock and or equipment with basic electricity and wiring damage disconnect electric power to system at Do not exceed the specification ratings main fuse or circuit breaker box until installation All wiring must conform to local and national electrical is complete codes and ordinances This control is a precision instrument and should be A WARNING handled carefully Rough handling or distorting compo A WARNING nents could cause the control to malfunction Do not use on circuits exceed
4. OR 120V I LO SPEED FAN FAN R TIMEI HI SPEED RELAY FAN INTERNAL WIRING FIELD INSTALLED WIRING i ELECTRICAL CONNECTION 120 V 240 VAC DIAGRAM 1F51 619 or 1F51W 619 THERMOSTAT 8A18Z 2 PUMP MOTOR 240 V I LO SPEED FAN N TIMER HI SPEED RELAY FAN 2 SPEED FAN 240 V INTERNAL WIRING FIELD INSTALLED WIRING ELECTRICAL CONNECTION Figure 4 Typical wiring diagrams CHECKOUT 1 After mounting and wiring has been completed set thermostat switch to OFF position and fan switch to LO position Turn thermostat lever to 5 and thermo stat switch to COOL Nothing should happen pro vided the room temperature is below 95 F 2 Turn thermostat lever to 1 The pump should start immediately provided the room temperature is above 55 F 3 After a time delay of 30 to 120 seconds to allow the cooling pads to become soaked the fan should start running at low speed 4 Turn fan switch to HI position The fan should now be operating on high speed 5 Turn thermostat switch to VENT position The pump should stop immediately 6 Turn the thermostat switch to OFF position After a delay of 3 to 30 seconds the fan should stop running TECH SUPPORT HELP LINE 1 800 284 2925 White Rodgers is a division 1 i of Emerson Electric Co white The Emerson logo i O ers trademark and a Re mark g E M E RSO N j of Emerson Electri
5. c Co St Louis Missouri Climate Technologies www white rodgers com
6. ing specified volt age Higher voltage will damage control and could cause shock or fire hazard S PART NO 37 5918C EMERSON www white rodgers com Replaces 37 5918B Climate Technologies 0720 SPECIFICATIONS Electrical Ratings Input Voltage 120 or 240 VAC 60 Hz Operating Ambient Temperature Range 40 to 150 F 5 to 65 C Power Consumption 6 Watts nominal with all three relays energized Fan Rating 12 FLA 72 LRA 120 VAC 6 FLA 36 LRA 240 VAC Pump Rating 10 FLA 60 LRA 120 VAC 5 FLA 30 LRA 240 VAC The 8A18Z 2 Evaporative Cooler Control consists of three relays and a low voltage transformer with dual voltage primary The pump relay is automatically oper ated which allows the cooler pads to become wet before the fan starts This will eliminate the fan from blowing dust warm air and odor on initial start up The fan relay controls operation of the fan without the pump when the thermostat subbase is in the vent position and controls operation of both fan and pump when the thermostat subbase is in the cool position INSTALLATION 1 Remove cover screw To remove cover pull cover outward at the top then lift cover off the locating tabs at the bottom of the case 2 Remove panel assembly from case and discard pack ing material NOTE Place panel assembly in a safe location to prevent dam age to the panel while installing the case 3 Determine which knockouts will be used for electrical conduits then
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