Carrier 58TMA TypicalGas Pipe Arrangement A89414, ControlCenter, ElectricalConnections, Venting

GAS￿

SUPPLY

MANUAL￿ SHUTOFF￿ VALVE￿ (REQUIRED)

SEDIMENT￿

TRAP

UNION

Fig. 13—Typical Gas Pipe Arrangement A89414

EAC - ELECTRONIC￿ AIR CLEANER￿

(115-VAC 1 AMP MAX)

NOTE: Proper polarity must be maintained for 115-v wiring. If polarity is incorrect, the furnace control status LED will flash rapidly and prevent heating operation.

→The cabinet must have an uninterrupted or unbroken ground according to NEC ANSI/NFPA 70-1996 and Canadian Elec- trical Code CSA C22.1 or local codes to minimize personal injury if an electrical fault should occur. This may consist of electrical wire or conduit approved for electrical ground when installed in accordance with existing electrical codes. Do not use gas piping as an electrical ground.

24-V WIRING

Refer to ESD Precautions Procedure before proceeding with 24-v connections.

Make field 24-v connections at the 24-v terminal block. (See Fig. 14.) Connect terminal Y/Y2 as shown in Fig. 15 or 16 for proper operation in cooling mode. Use AWG No. 18 color-coded, copper thermostat wire only.

When furnace is installed in horizontal position with RH discharge air, 24-v wire connections can be made easier by removing the 2 control box mounting screws and letting control box turn so that 24-v screw terminals are visible. Be sure to reinstall control box after connections are made.

The 24-v circuit contains an automotive-type, 3-amp fuse located

7 8 9

4 5 6

1 2 3

PR2	L2	COM	EAC-2	EAC-1	PARK
PR1	L1	HI-COOL	HI-GAS￿ -HEAT	LO-GAS￿ -HEAT			FU1 3
						SEC-1	SEC-2
					10	11	12
					7	8	9
					4	5	6
					1	2	3

MASTER

1

3-AMP￿

FUSE

LED -￿

DIAGNOSTIC￿ LIGHT

TWIN / TEST￿

TERMINAL

on main control. Any 24-v electrical shorts during installation, service, or maintenance could cause this fuse to blow. If fuse replacement is required, use ONLY a 3-amp fuse. The control will flash code 24 when fuse needs replacement.

ACCESSORIES

1. Electronic air cleaner (EAC)

A terminal block (EAC-1 [hot] and EAC-2 [neutral]) is

			TWIN￿ TEST	LED
				1
				HUM
				G
				W/W1Y/Y2 R
			OFF	COM￿ 24V
4	3	2	1
			ON	W2

HUM -￿

HUMIDIFIER￿ (24-VAC 0.5￿

AMP MAX)

24-VOLT￿

THERMOSTAT￿ TERMINALS

provided for EAC connection. (See Fig. 14.) The terminals are

energized with 115v, 1-amp maximum during blower motor

operation.

2. Humidifier (HUM)

Screw terminals (HUM-1 and COM) are provided for 24-v humidifier connection. The terminals are energized with 24v, 0.5-amp maximum when the gas valve is energized.

FURNACE AND￿

BLOWER OFF DELAY￿

SETUP SWITCHES

Fig. 14—Control Center A93348

Step 8—Electrical Connections

115-V WIRING

Refer to unit rating plate or Table 6 for equipment electrical requirements. The control system requires an earth ground for proper operation.

Do not connect aluminum wire between disconnect switch and furnace. Use only copper wire.

→Make all electrical connections in accordance with the current edition of the National Electrical Code (NEC) ANSI/NFPA 70-1996 and any local codes or ordinances that might apply. For Canadian installations, all electrical connections must be made in accordance with CSA C22.1 Canadian Electrical Code or authori- ties having jurisdiction.

Step 9—VENTING

→Refer to National or Local Installation Code such as; National Fuel Gas Code NFPA No. 54-1996/Z223.1-1996, or the Canadian Installation Code, CAN B149.1- and .2-M95, for proper vent sizing and installation requirements. Use enclosed Venting Tables for Category I Fan-Assisted Furnaces for quick, easy reference. The horizontal portion of the venting system shall maintain a minimum of 1/4-in. upward slope per linear ft, and it shall be rigidly supported every 5 ft or less with hangers or straps to ensure that there will be no movement after installation.

Step 10—Start-Up, Adjustment, and Safety Check

GENERAL

The furnace must have a 115-v power supply properly connected and grounded. Correct polarity must be maintained to enable gas heating operation.

The gas service pressure must not exceed 0.5 psig (14-in. wc), and be no less than 0.16 psig (4.5-in. wc).

Thermostat wire connections at R and W/W1 are the minimum required for gas heating operation. W2 must be connected for 2-stage heating thermostats. COM, Y/Y2, and G are required for cooling, heat pumps, and some clock thermostats. These must be made at 24-v terminal block on control. (See Fig. 14.)

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