White Rodgers 8A18Z-2 User's Manual
Contents
1. 8A18Z 2 WHITE RODGERS 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 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 the White Rodgers 1F51 619 or 1F51W 619 Thermostat to provide auto matic temperature and ventilation control and remote fan speed selection of an evaporative cooler with 2 speed fan The pump relay is automatically operated to allow wetting of cooler pads before starting fan If in 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 with basic electricity and wiring Do not exceed the specification ratings All wiring must conform to local and national electrical codes and ordinances This control is a precision instrument and should be handled carefully Rough handling or distorting compo nents could cause the control to malfunction MY WHITE RODGERS DIVISION p EMERSON ELECTRIC CO 9797 REAVIS ROAD eMiznaan ST LOUIS MISSOURI 63123 5398 Printed in U S A DESCRIPTION PRECAUTIONS To prevent electrical shock and or equipment damage disconnect electric power to s2. APORATIVE COOLER THERMOSTAT wn WHITE RODGERS READ ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL The 1F51 619 low voltage thermostat is designed to operate with the White Rodgers 8A18Z 1 Evaporative Cooler Control For versatility the thermostat sub base has a System Switch that lets you select VENT COOL or OFF positions while the Fan Switch offers the selection of LOW or HIGH fan speed wi MTE Ope on SPECIFICATIONS Electrical Rating 30V A C Max Switch Action SPST Sealed Mercury Contacts close on temperature rise Temperature Scale Range 1 to 5 Cooler to Warmer Differential 1 F Dimensions 3 x 47 x 1 SAFETY Installation of this equipment should be done by an experienced service technician e Improper connections could cause shock or fire hazard CAUTION To prevent electrical shock and equipment damage disconnect electrical power to system at main fuse or circuit breaker box until installation is complete e All wiring must conform to local and national electrical codes and ordinances e Rough handling tampering or distorting components of control could cause the control to malfunction WARNING e Do not exceed the specification ratings on this control Check the manufacturer s information supplied with the associated product SELECTING THERMOSTAT LOCATION Avoid locations close to air registers or in the direct path of air from them The pro
3. E Pump relay and fan timer relay energized by thermostat Water begins circulating on cooler pads fan will start on low speed after a short time delay COOLING MODE Pump relay and fan timer relay energized by thermostat Fan speed relay e is energized by fan switch in HI position Water begins circulating on cooler pads fan will start on high speed after a short time delay VENT MODE Fan timer relay energized by thermostat Fan speed relay is energized by fan switch in HI position Fan will start on high speed after a short time delay VENT MODE Fan timer relay energized by thermostat Fan will start on low speed after a short time delay Indicates switch position on thermostat sub base and system function in operation O If left in HI position no Fan but fan speed relay will remain energized Fan timer relay energized in approximately one minute When system shuts off it opens in approximately minute If you need further information about this product please write to White Rodgers Division Emerson Electric Co 9797 Reavis Road St Louis MO 63123 5398 Attention Technical Service Department
4. IAGRAM N 1F51 619 or 1 51W 619 THERMOSTAT K Ja 4 1 l l l 15 7c 000 FAN TIMER RELAY LO SPEED FAN FAN R TIME HISPEED RELAY FAN 2 SPEED FAN 120 V INTERNAL WIRING FIELD INSTALLED WIRING 4 ELECTRICAL CONNECTION 240 VAC DIAGRAM 1F51 619 or 1 51W 619 THERMOSTAT l PUMP MOTOR 240V l I LO SPEED FAN A FAN G j TIMER COM HI SPEED RELAY FAN 2 SPEED FAN 240 V I INTERNAL WIRING FIELD INSTALLED WIRING _4 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 INSTALLATION INSTRUCTIONS 1F51 619 LOW VOLTAGE EV
5. al to prevent drafts from affecting thermostat operation 4 Fasten sub base loosely to wall in position shown in Fig 1 using two mounting screws provided Level sub base by placing spirit level on bottom of sub base Tighten mounting screws to secure sub base in level position Mounting Thermostat to Sub Base 1 Remove cover from thermostat by pulling it straight outward 2 Attach thermostat base to sub base being sure that all screws are tightened snugly since they serve as electrical connections between thermostat and sub base 3 Snap on thermostat cover and set thermostat to desired setting The thermostat scale range has numbers from 1 WIRING All wiring should be done according to local and national electrical codes and ordinances NOTE See Instruction Sheet on 8A18Z 1 Evaporative Cooler Control for typical system hook up MOUNTING SCREWS SUB BASE CAPTIVE SCREWS THERMOSTAT BASE Fig 1 COVER through 5 The number 1 represents the cooler controlling temperature and number 5 represents the warmer controlling temperature COOLING THERMOSTAT a ANGIERA ONG SUB BASE OPERATIONS The chart below illustrates system and thermostat function during various modes of operation SUBBASE SWITCH POSITIONS SYSTEM FUNCTIONS FAN SYSTEM FAN HI LO OFF COOL VENT TIMER RELAY SPEED RELAY RELAY PUMP COMPONENT OPERATION Q e o NO FAN NO PUMP NO COOL COOLING MOD
6. at before installing panel assembly in 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 INSTALLATION cont d All wiring should be done in accordance with local and national electrical codes and ordinances 120 VAC D
7. hich knockouts will be used for electrical conduits then 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 2 Dia holes 2 x 5 center line to center line Dimensions 6 wide x 8 high x 3 deep Line connections 8A18Z 2 Low voltage Pum bite transformer connections Pump relay Low voltage thermostat connections Fan connections Fan timer relay Figure 1 Panel assembly Flat washers Mounting holes ator four bolts 7 and washers Panel mounting Figure 3 Electrical knockouts 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 thermost
8. per location of the room thermostat is most 5 important to insure that it will provide a comfortable home temperature Observe the following general rules when selecting a location 6 Make sure there are no pipes or duct work in that part of the wall chosen for the thermostat location 1 Locate it about 5 ft above the floor 7 Never locate it in a room that is warmer or cooler 2 Install it on a partitioning wall not on an outside wall than the rest of the home 3 Never expose it to direct light from lamps sun 8 Avoid location with lack of air circulation such as fireplaces or any temperature radiating equipment behind doors or alcoves 4 Avoid locations close to doors that lead outside 9 The living or dining room is normally a good location windows or adjoining outside walls HEM WHITE RODGERS DIVISION provided there is no cooking range or refrigerator on opposite side of wall PART NO 37 5918B Replaces 37 5918A 9909 Es EMERSON ELECTRIC CO 9797 REAVIS ROAD measan Ol LOUIS MISSOURI 63123 5398 Printed in U S A INSTALLATION Attaching Sub Base to Wall 1 Route wire from cooling equipment to thermostat location and pull wires through hole in wall so that 6 in of cable protrudes 2 Pull wires through opening near center of sub base and connect wires beneath proper terminal screws as shown under wiring 3 Push excess wire into wall or switch box and plug up hole with non combustible materi
9. ystem at main fuse or circuit breaker box until installation is complete Do not use on circuits exceeding specified volt age Higher voltage will damage control and could cause shock or fire hazard PART NO 37 5918B Replaces 37 5918A 9909 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 w
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