White-rodgers 1F90 Manuel d'utilisateur télécharger pdf (Page 2)

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

they are 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.

WARNING

DO NOT REMOVE OR WIRE AROUND LIMIT AND

SAFETY SWITCHES WHEN INSTALLING ISOLA-

TION RELAYS.

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White-rodgers 1F90 Manuel d'utilisateur Page 2