Johnson-controls TG9S*MP User Manual download pdf (Page 11)

364861-UIM-B-0708

Johnson Controls Unitary Products 11

Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures.

Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes.

The furnace shall be installed so that the electrical components are protected from water.

SUPPLY VOLTAGE CONNECTIONS

1. Provide a power supply separate from all other circuits. Install

overcurrent protection and disconnect switch per local/national

electrical codes. The switch should be close to the unit for conve-

nience in servicing. With the disconnect or fused switch in the OFF

position, check all wiring against the unit wiring label. Refer to the

wiring diagram in this instruction.

2. Remove the screws retaining the wiring box cover. Route the

power wiring through the opening in the unit into the junction box

with a conduit connector or other proper connection. In the junc-

tion box there will be 3 wires, a Black Wire, a White Wire. Connect

the power supply as shown on the unit-wiring label on the inside of

the blower compartment door or the wiring schematic in this sec-

tion. The black furnace lead must be connected to the L1 (hot)

wire from the power supply. The white furnace screw must be con-

nected to neutral. Connect the power supply ground to the green

screw (equipment ground) An alternate wiring method is to use a

field provided 2” (5.1 cm) x 4” (10.2 cm) box and cover on the out-

side of the furnace. Route the furnace leads into the box using a

protective bushing where the wires pass through the furnace

panel. After making the wiring connections replace the wiring box

cover and screws. Refer to Figure 17, "Electrical Wiring".

3. The furnace's control system requires correct polarity of the power

supply and a proper ground connection. Refer to Figure 17, "Elec-

trical Wiring"

LOW VOLTAGE CONTROL WIRING CONNECTIONS

Install the field-supplied thermostat by following the instructions that

come with the thermostat. With the thermostat set in the OFF position

and the main electrical source disconnected, connect the thermostat

wiring from the wiring connections on the thermostat to the terminal

board on the ignition module, as shown in Figure 18, "Thermostat Chart

- Single Stage AC with Single Stage PSC Furnaces". Electronic thermo-

stats may require the common wire to be connected. Apply strain relief

to thermostat wires passing through cabinet. If air conditioning equip-

ment is installed, use thermostat wiring to connect the Y and C termi-

nals on the furnace control board to the proper wires on the condensing

unit (unit outside).

The 24-volt, 40 VA transformer is sized for the furnace components

only, and should not be connected to power auxiliary devices such as

humidifiers, air cleaners, etc. The transformer may provide power for an

air conditioning unit contactor.

Table 6: Ratings & Physical / Electrical Data

Input Output

Nominal

Airflow

Total Unit

Amps

AFUE

Air Temp. Rise

Max

Over-Current

Protect

Min. wire Size

(awg) @ 75 ft

one way

Max. Outlet

Air Temp

MBH kW MBH kW CFM

/min

°F °C °F °C

40 11.7 38 11.1 800 22.7 8.0 95.5 30-60 17-33 15 14 155 68.3

60 17.6 57 16.7 1000 28.3 10.0 95.5 30-60 19-36 15 14 155 68.3

60 17.6 57 16.7 1200 34.0 10.0 95.5 30-60 19-36 15 14 160 71.1

80 23.4 76 22.3 1200 34.0 10.0 95.5 35-65 19-36 15 14 165 73.9

80 23.4 76 22.3 1600 45.3 11.5 95.5 35-65 19-36 15 14 155 68.3

80 23.4 76 22.3 2200 62.3 17.0 95.5 35-65 19-36 20 12 155 68.3

100 29.3 95 27.8 1600 45.3 11.5 95.5 35-65 19-36 15 14 165 73.9

100 29.3 95 27.8 2000 56.6 17.0 95.5 35-65 19-36 20 12 155 68.3

120 35.1 114 33.4 1600 45.3 11.5 95.5 40-70 22-39 15 14 170 76.7

120 35.1 114 33.4 2000 56.6 17.0 95.5 35-65 19-36 20 12 160 71.1

130 38.1 123.5 36.2 2000 56.6 17.0 95.5 45-75 28-44 20 12 165 73.9

FIGURE 17: Electrical Wiring

Electrical Entry

Junction

Box

L1-Hot

Neutral

Connect ground

lead to screw

BLK

WHT

The power connection leads and wiring box may be relocated to the

left side of the furnace. Remove the screws and cut wire tie holding

excess wiring. Reposition on the left side of the furnace and fasten

using holes provided.

Set the heat anticipator in the room thermostat to 0.4 amps. Setting

it lower will cause short cycles. Setting it higher will cause the room

temperature to exceed the set points.

Some electronic thermostats do not have adjustable heat anticipa-

tors. They should be set to six cycles per hour. Follow the thermo-

stat manufacturer's instructions.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 37 38

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