Johnson Controls TGLS*MP, TG8S*MP Section V Electrical Power, Electrical Power Connections, Afu

356485-UIM-G-1211

SECTION V: ELECTRICAL POWER

ELECTRICAL POWER CONNECTIONS

Field wiring to the unit must be grounded. Electric wires that are field installed shall conform to the temperature limitation for 63°F (35°C) rise wire when installed in accordance with instructions. Refer to Table 6 in these instructions for specific furnace electrical data.

Table 6: Ratings & Physical / Electrical Data

Use copper conductors only.

				Nominal			Air Temp.		Max.
Input		Output							Outlet		Blower			Max	Total	Min. wire Size
				Airflow		AFU	Rise						Blower
									Air Temp					Over-Current	Unit	(awg) @ 75 ft
						E							Size	Protect	Amps	one way
MB	kW	MB	kW	CFM	m3/		°F	°C	°F	°C	HP	Amp
H		H			min							s
40	11.7	32	9.4	800	22.7	80.0	25-55	14-31	155	68.3	1/5	2.1	9 x 8	10	4.5	14
60	17.6	48	14.1	1000	28.3	80.0	25-55	14-31	155	68.3	1/3	3.8	9 x 8	10	6.0	14
60	17.6	48	14.1	1200	34.0	80.0	30-60	17-33	170	76.7	1/3	4.8	11 x 8	10	7.0	14
80	23.5	64	18.8	1200	34.0	80.0	35-65	19-36	165	73.9	1/3	4.8	11 x 8	10	7.5	14
80	23.5	64	18.8	1600	45.3	80.0	25-55	14-31	155	68.3	1/2	7.5	11 x 10	15	10.0	14
80	23.5	64	18.8	2200	62.3	80.0	25-55	14-31	155	68.3	1	14.5	11 x 11	20	16.0	12
100	29.3	80	23.4	1200	34.0	80.0	40-70	22-39	170	76.7	1/3	4.8	9 x 8	10	7.5	14
100	29.3	80	23.4	1600	45.3	80.0	35-65	19-36	165	73.9	1/2	7.5	11 x 10	15	10.0	14
100	29.3	80	23.4	2000	56.6	80.0	25-55	14-31	155	68.3	1	14.5	11 x 11	20	17.0	12
120	33.7	96	26.9	1600	45.3	80.0	40-70	22-39	170	76.7	1/2	7.5	11 x 10	15	10.0	14
120	33.7	96	26.9	2000	56.6	80.0	30-60	17-33	160	71.1	1	14.5	11 x 11	20	17.0	12
130	38.1	104	30.5	2000	56.6	80.0	35-65	19-36	165	73.9	1	14.5	11 x 11	20	17.0	12

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

Junction Box

Connect ground lead to screw

Electrical Entry

L1-Hot BLK

Neutral WHT

FIGURE 16: Electrical Wiring

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 16.

3.The furnace's control system requires correct polarity of the power supply and a proper ground connection. Refer to Figure 16

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.

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 Figures 17 or 18. Electronic thermostats may require the common wire to be connected. Apply strain relief to thermostat wires passing through cabinet. If air condition- ing equipment is installed, use thermostat wiring to connect the Y and C terminals on the furnace control board to the proper wires on the con- densing unit (unit outside).

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.

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.

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