Carrier 58TMA operating instructions BlowerOff Delay Setup Switch Position

FIELD 24-V WIRING￿

FIELD 115-, 208/230-, 460-V WIRING￿ FACTORY 24-V WIRING￿ FACTORY 115-V WIRING

2-STAGE THERMOSTAT TERMINALS￿

SEVEN￿

WIRE

W2 W1￿ Y2 R￿ G Y1 C

FIELD-SUPPLIED￿ FUSED DISCONNECT

		THREE-WIRE￿						208/230- OR￿
			HEATING-￿
								460-V￿
			ONLY
								THREE￿
BLK	BLK			W2				PHASE
WHT	WHT			COM
				W/W1				208/230-V￿
	GND						C	SINGLE￿
				Y/Y2				PHASE
115-V FUSED￿		JUNCTION￿
							Y1
DISCONNECT￿		BOX	CONTROL￿	R			Y2	GND
	SWITCH￿						2-SPEED￿
(WHEN REQUIRED)			BOX	G￿
							CONDENSING￿
				24-V￿			UNIT
			TERMINAL￿
			BLOCK		NOTES:	1.	Connect Y-terminal as shown for proper operation.￿
			FURNACE
						2￿. Some thermostats require a "C" terminal connection as shown.

3.If any of the original wire, as supplied, must be replaced,￿ use same type or equivalent wire.

A97444

→Fig. 16—Heating and Cooling Application Diagram With 2-Stage Thermostat and Condensing Unit

Table 8—Blower Off Delay Setup Switch

Position

DESIRED HEATING	SETUP SWITCH
MODE BLOWER OFF
	SW-3	SW-4
DELAY (SEC)
90	OFF	OFF
135	OFF	ON
180	ON	OFF
225	ON	ON

his furnace is equipped with 2 manual reset limit switches in gas control area. The switches will open and shut off power to gas valve if a flame rollout or an overheating condition occurs in gas control area. DO NOT bypass switches. Correct inadequate combustion air supply, component failure, re- stricted flue gas passageway before resetting switches.

SEQUENCE OF OPERATION

Using the schematic diagram follow sequence of operation through different modes. (See Fig. 18.) Read and follow wiring diagram very carefully.

NOTE: If power interruption occurs during "call for heat" (W/W1 or W/W1-and-W2), control starts 90-sec blower only on period 2 sec after power is restored if thermostat is still calling for gas heating. The red LED flashes code 12 during 90-sec period, after which LED will be on continuously as long as no faults are detected. After 90-sec period, furnace responds to thermostat normally.

Blower door must be installed for power to be conducted through blower door interlock switch ILK to furnace control CPU, trans- former TRAN, inducer motor IDM, blower motor BLWM, hot surface ignitor HSI, and gas valve GV.

1.Adaptive Heating Mode—Single-Stage Thermostat and 2-Stage Heating

(See Fig. 16 for thermostat connections.)

4	3		2		1
							OFF
							ON
	BLOWER-￿			LOW￿		HIGH￿
				HEAT￿
		OFF￿				HEAT￿
			(ADAPTIVE￿
	DELAY					ONLY
			ALGORITHM)

A96402

→Fig. 17—Setup Switches on Control Center (Factory Settings)

NOTE: With high-heat-only switch SW-1 off, low-heat-only switch SW-2 selects either low-heat-only operation mode when on (see item 2. below), or adaptive heating mode when off in response to "call for heat." (See Fig. 17.) When high-heat-only switch SW-1 is on, it always causes high-gas-heat operation when R-W/W1 circuit is closed, regardless of the setting of low-heat-only switch SW-2.

This furnace can operate as a 2-stage furnace with a single- stage thermostat because furnace control CPU includes a programmed adaptive sequence of controlled operation which selects low-gas-heat or high-gas-heat operation. This selection is based upon stored history of the length of previous gas heating on/off periods of single-stage thermostat.

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