Rheem 96MDV Series Installation Instructions Manual Download

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1. P1 (4-Pin), P2 (7-Pin) and P5 (5-Pin) - Low-Voltage

Internal Wiring

Connections – Connect main twist-

lock wire harness to these connections. Pre-wired
from the factory.

2. RJ-14 CONNECTOR (J1)

This connector is used to program the furnace control
at the factory. It should never be connected to a tele-
phone line or a telephone. Doing so could damage the
furnace control or the telephone (or telephone lines)
or both.

3. SPARK IGNITION TRANSFORMER (T1)

The spark ignition transformer resides on the furnace

control. The transformer provides spark energy at ap-
proximately 60 hz frequency and a minimum of 12KV.

4. BIAS / TERMINATION (S4)

For current installations, all three of the dip-
switches in bank SW4 must be in the “OFF” posi-
tion. If not, the system may not be able to
communicate.

5. COMMUNICATIONS LED’S (U38)

Two LED’s are provided to indicate the status of com-

munications. A red LED (Labeled TX) is provided for
transmit and a green LED (Labeled RX) is provided
for receive. These LED’s will be lit in an undefined
pattern when other communicating components are
attached and communicating with the furnace control.

6. LINE VOLTAGE CONNECTIONS (120VAC, L1)

Four ¼” Quick-Connect style terminals are provided

for internal connections and accessories.

7. INDUCED DRAFT MOTOR (INDUCER) OUTPUT

(P3)

This three-pin Mate-n-Lok style connector provides

power to both the high and low speed inducer outputs.

8. NEUTRAL TERMINALS (N)

Four ¼” Quick-Connect style terminals are provided

for internal connections and accessories.

9. ELECTRONIC AIR CLEANER (E.A.C.) OUTPUT (T3)

This output is used to energize an electronic air

cleaner. The output will provide 1.0 amp at 115 VAC.
This output is energized any time the blower motor is
above the airflow CFM values specified below. Airflow
below this value is not considered to be enough for a
typical electronic air cleaner to perform properly.

For ½ HP motors - Electronic air cleaner is energized

any time the blower is above 500 CFM

For ¾ HP motors - Electronic air cleaner is energized

any time the blower is above 600 CFM

For 1 HP motors - Electronic air cleaner is energized

any time the blower is above 700 CFM

Continuous fan speeds are selectable and some lower

fan speeds may not deliver enough airflow to operate
an electronic air cleaner. The IFC determines the mini-
mum airflow necessary to operate an electronic air
cleaner and will not turn on the electronic air cleaner
unless the airflow is high enough for the EAC.

10. HUMIDIFICATION (T3) AND DEHUMIDIFICATION

HUMIDIFIER – The humidifier contacts (labeled

“HUM” (2)) are “dry” contacts on the I.F.C. This means
that the terminals are connected directly to the con-
tacts of a board-mounted relay. The coil of the relay is
controlled by the microprocessor of the IFC. The coil
is engaged roughly any time the heat speed blower is
engaged and (1) 24VAC is present on the thermostat
terminal of the IFC labeled “HUM STAT” or (2) a com-
municating thermostat with humidification and dehu-
midification capability is installed with call for
humidification present. (See Figure 45 for location of
humidification/dehumidification inputs on furnace con-
trol.)

INTEGRATED FURNACE CONTROL

ica

tin

g F

urn

ace

WARNING

DO NOT CONNECT A TELEPHONE OR PHONE LINE
TO THE CONNECTOR (JACK) AT POSITION J-11.
DOING SO COULD CAUSE IRREPARABLE DAMAGE
TO EITHER THE FURNACE CONTROL (I.F.C.) OR
THE TELEPHONE (OR TELEPHONE LINE) OR
BOTH.

FIGURE 45

ELECTRONIC AIR CLEANER AND HUMIDIFIER TERMINALS

ST-A1194-64-00