Rheem 97MDV060 Series Installation Instructions Manual page 81

AUXILIARY INPUTS
FIGURE 54
WIRING OF SUPPLY AIR (SA) AND OUTDOOR AIR (OAT) TEMPERATURE SENSORS.
17. AUXILIARY INPUTS (COMMUNICATING SYSTEMS
ONLY) (T5) (SEE FIGURE 55)
Terminal T5 is provided for field installation of up to
two auxiliary switches. The auxiliary inputs shall be
used to provide a means of using traditional drain pan
switches, smoke detectors, freeze switches, etc. The
inputs are to be labeled Aux 1 and Aux 2. The switch
inputs are for communicating systems only. One or
both inputs can be configured at the communicating
thermostat as either normally-opened or normally
closed contacts. System operation when the contacts
either open or close can be configured at the
communicating thermostat.
A resistance of greater than 1k ohms to common shall
be detected as an open switch and a resistance of
less than 100 ohms shall be recognized as a closed
switch.
18. THERMOSTAT INPUTS (T2) – THERMOSTAT
WIRING DIAGRAMS
Both communicating and legacy thermostats are to be
connected at terminal block T2.
A. COMMUNICATING SYSTEMS
The furnace is capable of communicating with a
thermostat and condenser to improve cooling and
INTEGRATED FURNACE CONTROL
NOTE: SUPPLY AIR SENSOR MUST NOT
BE IN DIRECT LINE-OF-SIGHT TO
THE HEAT EXCHANGER.
heat-pump airflow, displaying active faults and
active furnace information at the thermostat and
improved diagnostics and troubleshooting.
WIRING A FURNACE FOR COMMUNICATIONS.
Maximum wire lengths and notes about wiring
communicating systems are noted below.
MAXIMUM COMMUNICATING WIRE LENGTHS
(E1, E2, R & C)
Max Wire Length – Thermostat to Furnace = 125 FT @ 18 AWG*
Max Wire Length – Furnace to Condenser = 125 FT @ 18 AWG*
Max Wire Length – Between any 2 devices = 125 FT @ 18 AWG*
Sum Max Total Wire Length for All Components = 500 ft
(see Figure 56)
Notes:
1. Wires may be solid or stranded.
2. *Wire gage smaller than 18 AWG is not approved or
recommended for this application.
3. If the thermostat wiring will be located near or in
parallel with high voltage wiring, cable TV, Ethernet
wiring, or radio frequency equipment, then shielded
thermostat wire can be used to reduce or eliminate
potential interference. The shielding must be
ST-A1194-63 (BOTTOM)
ST-A1194-63-01
81