White Rodgers Fan 8A18Z 2 User Manual

8A18Z-2  
Evaporative Cooler Control  
WHITE-RODGERS  
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 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.  
PRECAUTIONS  
CAUTION  
To prevent electrical shock and/or equipment  
damage, disconnect electric power to system, at  
main fuse or circuit breaker box, until installation  
is complete.  
Ifindoubtaboutwhetheryourwiringismillivolt,line,orlow  
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.  
WARNING  
Do not use on circuits exceeding specified volt-  
age.Highervoltagewilldamagecontrolandcould  
cause shock or fire hazard.  
!
WHITE-RODGERS DIVISION  
EMERSON ELECTRIC CO.  
9797 REAVIS ROAD  
ST. LOUIS, MISSOURI 63123-5398  
PART NO. 37-5918B  
Replaces 37-5918A  
Printed in U.S.A.  
9909  
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INSTALLATION(cont’d)  
5. Select an appropriate location for mounting the con- All wiring should be done in accordance with local and  
trol. Position the case on a smooth flat surface in a national electrical codes and ordinances.  
vertical position only(with electrical knockouts down).  
120 VAC DIAGRAM  
Mount the case using flat washers and screws (not  
provided) through the four mounting holes in the back  
of the case.  
N
1F51-619 or 1F51W-619 THERMOSTAT  
120V  
W
Y
G
R
HOT  
8A18Z-2  
GND  
N
L2  
P2  
F2  
120V  
120V  
120V  
240V  
240V  
240V  
R
P2  
F2  
NOTE  
W
Y
PUMP  
RELAY  
FAN SPEED  
RELAY  
Install conduit, then run wiring and install the thermostat  
according to thermostat installation instructions (included  
withthermostat)beforeinstallingpanelassemblyincase.  
L1  
P1  
PUMP  
RELAY  
PUMP MOTOR  
(120 V)  
G
FAN TIMER  
RELAY  
L0  
HI  
LO SPEED  
FAN  
FAN  
TIMER  
RELAY  
L0  
COM  
HI SPEED  
FAN  
HI  
2-SPEED FAN  
(120 V)  
CAUTION  
!
INTERNAL WIRING  
FIELD INSTALLED WIRING  
ELECTRICAL CONNECTION  
Non-metallicenclosuredoesnotprovideground-  
ingbetweenconduitconnections.Usegrounding  
bushings and jumper wires to ensure proper  
grounding of control.  
240 VAC DIAGRAM  
1F51-619 or 1F51W-619 THERMOSTAT  
L2  
HOT  
HOT  
240V  
L1  
W
Y
G
R
8A18Z-2  
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.  
GND  
N
L2  
P2  
F2  
120V  
120V  
120V  
240V  
240V  
240V  
R
P2  
F2  
W
Y
PUMP  
RELAY  
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.  
FAN SPEED  
RELAY  
L1  
P1  
PUMP  
RELAY  
PUMP MOTOR  
(240 V)  
G
FAN TIMER  
RELAY  
L0  
HI  
LO SPEED  
FAN  
FAN  
TIMER  
RELAY  
L0  
COM  
HI SPEED  
FAN  
HI  
2-SPEED FAN  
(240 V)  
INTERNAL WIRING  
FIELD INSTALLED WIRING  
ELECTRICAL CONNECTION  
Figure 4. Typical wiring diagrams  
CAUTION  
!
CHECKOUT  
Do not over tighten panel mounting screws to  
avoid damage to the panel assembly.  
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.  
8. Connect wires to proper terminals (see fig. 4 for typical  
wiring connections).  
CAUTION  
!
Do not press against panel assembly while tight-  
ening terminal screws to avoid damage to the  
panel assembly.  
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.  
9. Replace cover and test operation per the checkout  
section.  
4. Turn fan switch to “HI” position. The fan should now be  
operating on high speed.  
WIRING  
5. Turn thermostat switch to “VENT” position. The pump  
should stop immediately.  
CAUTION  
!
6. Turn the thermostat switch to “OFF” position. After a  
delay of 3 to 30 seconds, the fan should stop running.  
To prevent electrical shock and/or equipment  
damage, disconnect electric power to system at  
main fuse or circuit breaker box until installation  
is complete.  
3
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INSTALLATION INSTRUCTIONS  
1F51-619  
LOW VOLTAGE  
EVAPORATIVE COOLER  
THERMOSTAT  
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.  
____________________________________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: 3¼” x 4½” x 1”  
________________________________________SAFETY_________________________________________  
Installation of this equipment should be done by an experienced  
service technician.  
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.  
All wiring must conform to local and  
national electrical codes and ordinances.  
Rough handling, tampering or distorting  
components of control, could cause the  
control to malfunction.  
WARNING: Do not exceed the specification ratings on this  
control. Check the manufacturer’s information  
supplied with the associated product.  
_____________________________SELECTING THERMOSTAT LOCATION__________________________  
The proper location of the room thermostat is most  
important to insure that it will provide a comfortable  
home temperature. Observe the following general rules  
when selecting a location:  
5. Avoid locations close to air registers, or in the direct  
path of air from them.  
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  
than the rest of the home.  
2. Install it on a partitioning wall, not on an outside wall.  
8. Avoid location with lack of air circulation, such as  
behind doors or alcoves.  
3. Never expose it to direct light from lamps, sun,  
fireplaces, or any temperature radiating equipment.  
9. The living or dining room is normally a good location  
provided there is no cooking range or refrigerator on  
opposite side of wall.  
4. Avoid locations close to doors that lead outside,  
windows or adjoining outside walls.  
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_____________________________________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 material 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  
through 5.  
The number “1” represents the cooler  
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  
controlling temperature, and number “5” represents the  
warmer controlling temperature.  
________________________________________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.  
______________________________________OPERATIONS______________________________________  
The chart below illustrates system and thermostat function during various modes of operation.  
SUBBASE SWITCH POSITIONS  
SYSTEM FUNCTIONS  
COMPONENT OPERATION  
FAN  
LO  
SYSTEM  
COOL  
FAN  
TIMER RELAY  
FAN  
SPEED RELAY  
PUMP  
RELAY  
HI  
OFF  
VENT  
NO FAN-NO PUMP-NO COOL  
COOLING MODE-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  
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.  
* Fan timer relay energized in approximately one minute. When system  
shuts off, it opens in approximately ½ minute.  
If left in “HI” position-no Fan, but fan speed relay will  
remain energized.  
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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  
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