White Rodgers 1F90 Manual de usuario

Printed in U.S.A. PART NO. 37-5426A

9507

1F90 and 1F97

Addendum to

INSTALLATION INSTRUCTIONS

WHITE-RODGERS

WHITE-RODGERS DIVISION

EMERSON ELECTRIC CO.

9797 REAVIS ROAD

ST. LOUIS, MISSOURI 63123-5398

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY

BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE

PERSONAL INJURY AND/OR PROPERTY DAMAGE.

PRECAUTIONS

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.

To prevent electrical shock and/or equipment

damage,disconnectelectricpowertosystem,at

main fuse or circuit breaker box, until installa-

tion is complete.

Do not short out terminals on gas valve or pri-

marycontroltotest.Shortorincorrectwiringwill

burn out thermostat and could cause personal

injury and/or property damage.

CAUTION

INSTALLATION

WHENTHISTHERMOSTATISCONNECTEDTOSOME

SYSTEMSTHATUSEHIGHIMPEDANCEINPUTELEC-

TRONIC MODULES, YOU MAY OBSERVE THE FOL-

LOWING CONDITIONS.

1. Thefurnace fanmay turnon whenheat hasnot been

called,ormaynotturnoffwhenthermostatissatisfied

and call for heat ends.

2. The furnace may not turn off when thermostat is

satisfied and call for heat ends.

3. The air conditioner may not turn off when thermostat

is satisfied and call for cool ends.

Ifyouobserveanyoralloftheseconditionsafterinstalling

thermostat,youcancorrectsystemoperationbyinstalling

isolationrelaysbetweenthethermostatandtheelectronic

ignitionmodule.Figures1and2showhowthreeisolation

relayscanbeinstalled[oneeachforthefan(G),heat(W),

andcool(Y)].Youmaynotneedtoinstallallthreeisolation

relays to correct the operation conditions.

Transformer

Red Jumper Wire

THERMOSTAT

24 VAC

Line

Voltage

Figure 1. Wiring for single transformer systems

RH W Y G RC

Heating

System Cooling

System Fan

Relay

Figure 1 shows a single transformer heating/cooling sys-

tem, with isolation relays installed in the heating (W),

cooling (Y), and fan (G) circuits. To simplify the diagram,

limit and safety switches are not shown here, although

they will be found either in the low or high voltage circuit.

Limit and safety switches must be retained. Refer to the

equipment manufacturer’s system wiring diagram for the

location of limit and safety switches.

DONOTREMOVEOR WIRE AROUNDLIMITAND

SAFETY SWITCHES WHEN INSTALLING ISOLA-

TION RELAYS.

WARNING

INSTALLATION (cont’d)

Transformer

THERMOSTAT

24 VAC

Line

Voltage

Figure 2. Wiring for two-transformer systems

RH W Y G RC

Heating

System Cooling

System Fan

Relay Transformer

24 VAC Line

Voltage

Figure 2 shows a two-transformer heating/cooling sys-

tem, with isolation relays installed in the heating (W),

cooling (Y), and fan (G) circuits. To simplify the diagram,

limit and safety switches are not shown here, although

theyarefoundeitherintheloworhighvoltagecircuit.Limit

and safety switches must be retained. Refer to the

equipment manufacturer’s system wiring diagram for the

location of limit and safety switches.

WARNING

DONOTREMOVEORWIRE AROUND LIMIT AND

SAFETY SWITCHES WHEN INSTALLING ISOLA-

TION RELAYS.

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