White Rodgers 1F90W-51 Specifications download pdf (Page 7)

LOCKOUT BYPASS OPTION

FOR QUALIFIED SERVICE TECHNICIANS’ USE

ONLY. OPERATORS SHOULD NOT USE THIS

FEATURE DUE TO POSSIBILITY OF EQUIPMENT

OR PROPERTY DAMAGE, OR PERSONAL INJURY.

COMPRESSOR SHORT TERM

CYCLE PROTECTION

This thermostat has a built-in short term (5-minute)

time delay. During this 5-minute period, the thermo-

stat will lock out the compressor to allow head pres-

sure to stabilize. If you want to override this feature

while testing thermostat operation, simply press

ADV

PRGM

and

HOLD

TEMP

buttons at the same time at initial startup.

DO NOT USE THE LOCKOUT BYPASS OPTION

UNLESS THE COMPRESSOR OIL HEATERS HAVE

BEEN OPERATIONAL FOR 6 HOURS AND THE

SYSTEM HAS NOT BEEN OPERATIONAL FOR AT

LEAST 5 MINUTES.

COOLING SYSTEM

To prevent compressor and/or property damage,

if power to the compressor has been off or

interrupted for more than 1 hour and the outdoor

temperature is below 50°F, DO NOT operate the

system for at least the amount of time the com-

pressor was off! This will allow the compressor

heaters to warm the compressor oils to avoid

damage due to slugging.

1. Press

SYSTEM

HEAT-OFF-COOL-AUTO

until COOL is displayed.

2. Press to adjust thermostat below room tem-

perature to call for cool. The blower should come on

immediately, followed by cold air circulation. How-

ever, if the red LED on the thermostat front is flashing,

the compressor lockout feature is operating (see

Lockout Bypass Option to temporarily override the

compressor lockout feature during testing).

If the thermostat display is operating properly, but the

cooling system does not operate when the above

steps are performed, the red jumper wire (provided

with thermostat) may not be properly installed be-

tween the RH and RC terminals. Disconnect electri-

cal power to system and properly install the jumper

wire per the appropriate wiring schematic.

Refer to the OPERATION GUIDE if you need additional

information on thermostat operation.

TROUBLESHOOTING

Refer to the Question & Answer section of the OPERA-

TION GUIDE for information on troubleshooting the ther-

mostat.

CAUTION

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White Rodgers 1F90W-51 Specifications Page 7

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