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the low-gas heat on time (from 0 to 16 minutes) which is
permitted before switching to high-gas heat.

If the power is interrupted, the stored history is erased, and the
control CPU selects low-gas heat for up to 16 minutes and
then switches to high-gas heat as long as the thermostat
continues to "call for heat". Subsequent selection is based on
stored history of the thermostat cycle times.

When the wall thermostat "calls for heat," the R-W1 circuit
closes. The furnace control performs a self-check, verifies the
low-heat and high-heat pressure switch contacts LPS and HPS
are open, and starts the inducer motor IDM in low speed or
high speed as appropriate.

a. Inducer prepurge period—As the inducer motor IDM

comes up to low speed or high speed, the low-heat pressure
switch contacts LPS (or LPS and HPS) close to begin a
15-sec prepurge period.

b. Ignitor warm-up—At the end of the prepurge period, the

hot surface ignitor HSI is energized for a 17-sec ignitor
warm-up period.

c. Trial-for-ignition sequence—When the ignitor warm-up

period is completed, the main gas valve relay contacts
MGVR-1 and -2 close to energize the low-heat gas valve
solenoid GV, the gas valve opens, and 24-v power is
supplied for a field-installed humidifier at terminals HUM
and Com. The low-heat gas valve solenoid GV permits gas
flow to the burners where it is ignited. After 5 sec, the
ignitor HSI is de-energized, and a 2-sec flame-proving
period begins.

If the furnace control CPU selects high-gas-heat operation,
the high-heat gas valve solenoid GV is also energized after
the normally closed high-heat pressure switch relay HPSR
closes and after the inducer motor IDM goes to high speed
and provides sufficient pressure to close the high-heat
pressure switch HPS. HPSR is open while the furnace is
powered in standby mode. If the high-heat pressure switch
HPS fails to close and the low-heat pressure switch LPS
closes, the furnace operates at low-heat gas flow rate until
the high-heat pressure switch closes.

Fig. 15—Unit Wiring Diagram

A94232

FUSED DISCONNECT

SWITCH (WHEN REQ'D)

NOTE #1

WHT

BLK

GRN

FU2

COMPONENT TEST

To initiate the component test sequence with no thermostat inputs and with all inducer Post-Purge and
Blower-Off Delay periods completed, short the 'TWIN/TEST' terminal to the 'COM' terminal for about two
seconds. The control will turn ON the inducer motor Low-Speed, inducer motor High-Speed, HSI,
blower motor Low-Gas-Heat Speed, blower motor High-Gas-Heat Speed, and blower motor High-Cool
Speed for 7-15 seconds each. Neither the gas valve nor the humidifier will be turned ON.

ALS1
ALS2
BHI/LOR
BHT/CLR
BLWM
BLWR
CAP
CPU
DSS
EAC-1
EAC-2
FRS1
FRS2
FSE
FU1
FU2
GV
HPS
HPSR
HSI
HSIR
HUM
IDM
IDR
IHI/LOR
ILK
JB
LED
LGPS
LPS
LS
MGVR

LEGEND

AUXILIARY LIMIT SWITCH, OVERTEMP.–MANUAL RESET, SPST-(N.C.)
AUXILIARY LIMIT SWITCH, OVERTEMP.–AUTO. RESET, SPST-(N.C.)
BLOWER MOTOR SPEED CHANGE RELAY, SPDT
BLOWER MOTOR SPEED CHANGE RELAY, SPDT
BLOWER MOTOR, 4-SPEED, PERMANENT-SPLIT-CAPACITOR
BLOWER MOTOR RELAY, SPST-(N.O.)
CAPACITOR
MICROPROCESSOR AND CIRCUITRY
DRAFT SAFEGUARD SWITCH
ELECTRONIC AIR CLEANER CONNECTION (115 VAC 1 AMP MAX.)
ELECTRONIC AIR CLEANER CONNECTION (COMMON)
FLAME ROLLOUT SWITCH OVERTEMP.–MANUAL RESET, SPST-(N.C.)
FLAME ROLLOUT SWITCH OVERTEMP.–MANUAL RESET, SPST-(N.C.)
FLAME-PROVING SENSOR ELECTRODE
FUSE, 3 AMP, AUTOMOTIVE BLADE TYPE, FACTORY INSTALLED
FUSE, FIELD INSTALLED
GAS VALVE-REDUNDANT LOW-HEAT OPERATORS, 2-STAGE
HIGH-HEAT PRESSURE SWITCH, SPST-(N.O.)
HIGH-HEAT PRESSURE SWITCH RELAY, SPST-(N.C.)
HOT-SURFACE IGNITOR (115 VAC)
HOT-SURFACE IGNITOR RELAY, SPST-(N.O.)
24VAC HUMIDIFIER CONNECTION (

5 AMP MAX.)

INDUCED DRAFT MOTOR, 2-SPEED, SHADED–POLE
INDUCER MOTOR RELAY, SPST-(N.O.)
INDUCER MOTOR SPEED CHANGE RELAY, SPDT
BLOWER DOOR INTERLOCK SWITCH, SPST-(N.O.)
JUNCTION BOX
LIGHT-EMITTING DIODE FOR STATUS CODES
LOW GAS-PRESSURE SWITCH, SPST-(N.O.)
LOW-HEAT PRESSURE SWITCH, SPST-(N.O.)
LIMIT SWITCH, OVERTEMPERATURE-AUTO RESET, SPST-(N.O.)
MAIN GAS VALVE RELAY, DPST-(N.O.)
– 1 = VALVE – 2 = HUMIDIFIER

PL1
PL2
PL3
PL4
PL6
PL7
SW1
SW2
SW3 & 4

TRAN
TWIN/TEST

12-CIRCUIT CONNECTOR
9-CIRCUIT CONNECTOR
3-CIRCUIT IDM CONNECTOR
1-CIRCUIT FPS CONNECTOR
2-CIRCUIT HSI CONNECTOR
2-CIRCUIT LINE/NEUTRAL CONNECTOR
HIGH-HEAT-ONLY SWITCH, SPST-(MANUAL)

LOW-HEAT-ONLY SWITCH, SPST-(MANUAL)

BLOWER-OFF DELAY SETTING SWITCHES,
SPST-(MANUAL)

TWINNING JUMPER, SPDT FOR MASTER OR
SLAVE STATUS-(MANUAL CHANGE-OVER)
TRANSFORMER-115VAC/24VAC
1-CIRCUIT TWINNING BUSS CONNECTOR,
ALSO STATUS CODE RECALL
JUNCTION
TERMINAL
CONTROL TERMINAL
FACTORY POWER WIRING (115VAC)
FACTORY CONTROL WIRING (24VAC)
FIELD POWER WIRING (115VAC)
FIELD CONTROL WIRING (24VAC)

CONDUCTOR ON CONTROL

FIELD WIRING SCREW TERMINAL

FIELD GROUND

EQUIPMENT GROUND

FIELD SPLICE

PLUG RECEPTICLE

5.
6.

8.
9.

10.

11.
12.

13.
14.

USE ONLY COPPER WIRE BETWEEN THE DISCONNECT SWITCH AND
THE UNIT.
IF ANY OF THE ORIGINAL WIRE, AS SUPPLIED, MUST BE REPLACED, USE
THE SAME OR EQUIVALENT TYPE WIRE.
INDUCER (IDM) AND BLOWER (BLWM) MOTORS CONTAIN INTERNAL AUTO-
RESET THERMAL OVERLOAD SWITCHES.
BLOWER MOTOR SPEED SELECTIONS ARE FOR AVERAGE CONDITIONS.
SEE INSTALLATION INSTRUCTIONS FOR DETAILS ON OPTIMUM SPEED
SELECTION.
REPLACE ONLY WITH A 3-AMP FUSE.
AUXILIARY LIMIT SWITCHES (ALS1 & 2) USED ON DOWNFLOW MODELS
ONLY.
THIS WIRE MUST BE CONNECTED TO FURNACE SHEET METAL FOR
CONTROL TO PROVE FLAME.
FACTORY CONNECTED WHEN LGPS NOT USED.
SYMBOLS ARE AN ELECTRICAL REPRESENTATION ONLY.
BLOWER-ON DELAY: GAS HEATING 45 SECONDS, COOLING/HEAT PUMP 2
SECONDS.
COOLING/HEAT PUMP BLOWER-OFF DELAY IS 90 SECONDS.
IGNITION-LOCKOUT WILL OCCUR AFTER FOUR CONSECUTIVE UNSUC-
CESSFUL TRIALS-FOR-IGNITION. CONTROL WILL AUTOMATICALLY RESET
AFTER THREE HOURS.
CONTROL MUST BE GROUNDED AT PIN 10 OF 12-PIN CONNECTOR.
NA - NOT APPLICABLE

NOTES:

320854-401 REV. D

FRS2

NOTE #8

LPS

CONNECTION DIAGRAM

RED

FRS1

(WHEN USED)

HEAT
SET-UP
SWITCH

NORM
HI HT
LO HT

SWITCH

OFF

SWITCH

BLOWER-OFF
DELAY
(SEC.)

90 SEC
135 SEC
180 SEC
225 SEC

2-STAGE
FURNACE
CONTROL

BLOWER-OFF DELAY

BLOWER-OFF DELAY
LOW-HEAT ONLY
HIGH-HEAT ONLY

OFF

W2 Com

24V

G HUM

TWIN
TEST

LED

1
2
3

RED

ORN

YEL

RED

ORN

YEL

NOTE

DSS

LGPS

ALS1

(WHEN USED)

NOTE

ALS2

ORN

BRN

BLU

WHT

GRN

10
11
12

1
2
3

7
8
9

BLK

GRY

SEC2

PR1 PR2

COMMON

HI-COOL

HI-GAS
HEAT

SEC1

LO-GAS
HEAT

EAC-2

EAC-1

PARK

FU1

PL2

YEL

(WHEN USED)

WHT

FSE

BLK

PL6

HSI

WHT

IDM

GRN

RED

WHT

BLK

3 PL3

RED

BLK

WHT

BRN

GRY

BRN

HPS

GRN

BLU

WHT

BLK

ILK

WHT

BLK

PL7

BLK

WHT

CAP

BRN

NOTE #4

COM

MED HI

MED LO

RED

BLU

WHT

BLK
YEL
BLU

RED

BLWM

RED

BLU

WHT

BLK

TRAN

SCHEMATIC DIAGRAM

(NATURAL GAS & PROPANE)

TO 115VAC FIELD DISCONNECT SWITCH

EQUIPMENT GROUND

I LK

PL7

BLWR

HSIR

EAC-1

EAC-2

BHT / CLR

BHI/LOR

LO-GAS-
HEAT

PARK

HI-COOL

COMMON

HI-GAS-
HEAT

MED LO
MED HI
HI

COM

BLWM

BRN

CAP

NOTE #4

IDR

IHI / LOR

PR1

115VAC

24VAC

TRAN

PR2

SEC1

SEC2

FU1

NOTE #5

HPSR

HSI

PL6

PL3

1
2

2
1

HI
COM

IDM

N / A

N /A

FRS1
(WHEN USED)

FRS2

MGVR-2

HUM

TWIN
TEST

SLAVE

MASTER

W/W1

SW1

Y/Y2

SW4

SW3

SW2

CPU

TWINNING
JUMPER
TJ

MGVR-1

PL1

N/A

PL4

FSE

NOTE#7

HPS

NOTE #8

LGPS

(WHEN USED)

NOTE #8 LPS

DSS

ALS1

ALS2

FACTORY

SETTING

PL2

GRY

NOTE #1

Содержание 58TMA

Страница 1: ...abels attached to or shipped with the unit and other safety precautions that may apply Follow all safety codes In the United States refer to the National Fuel Gas Code NFGC NFPA No 54 1992 ANSI Z223 1 1992 In Canada refer to the current edition of the National Standard of ama CANADIAN GAS ASSOCIATION APPROVED R Table 1 Clearances to Combustible Materials In UNIT SIZE 065 AND 085 105 AND 125 DOWNFL...

Страница 2: ...g ungrounded objects 7 An ESD service kit available from commercial sources may also be used to prevent ESD damage INTRODUCTION The model 58TMA Series 100 Furnaces are available in sizes 65 000 through 123 000 Btuh input capacities The design of the downflow horizontal gas fired furnace is A G A and C G A design certified for natural and propane gases and for installation on noncombustible floorin...

Страница 3: ...urnace may be installed on combustible flooring when installed with the accessory downflow subbase which is available from your distributor or branch when required LOCATION RELATIVE TO COOLING EQUIPMENT The cooling coil must be installed parallel with or on the downstream side of the furnace to avoid condensation in the heat exchangers When installed parallel with a furnace dampers or other means ...

Страница 4: ...fined space is constructed unusually tight air for combustion and ventilation MUST come from either the outdoors or spaces freely communicating with the outdoors Combustion and ventilation openings must be sized the same as for a confined space as defined below Return air must not be taken from the room unless an equal or greater amount of air is supplied to the room CONFINED SPACE A confined spac...

Страница 5: ...is taken from outdoors through vertical ducts the openings and ducts MUST have at least 1 sq in of free area per 4000 Btuh of the total input for all equipment within the confined space For Example COMBUSTION AIR FROM OUTDOORS THROUGH VERTICAL DUCTS 58TMA Furnace High Fire Input Btuh Free Area per Opening Sq In Round Pipe In Dia 63 000 15 8 5 84 000 21 0 6 105 000 26 3 6 123 000 30 8 7 b If combus...

Страница 6: ...esult in fire personal injury or death The 2 factory supplied filters are shipped in the blower compart ment After the return air duct has been connected to the furnace install the filters in a V formation inside the return air plenum See Fig 8 and Table 3 for horizontal applications Horizontal filter retainers must be field supplied See Fig 9 for downflow applica tions Step 7 Gas Piping Gas pipin...

Страница 7: ...ore the test See Fig 10 It is recommended that the ground joint union be loosened before pressure testing After all connections have been made purge the lines and check for gas leakage with regulated gas supply pressure Step 8 Electrical Connections 115 V WIRING Refer to the unit rating plate or Table 5 for equipment electrical requirements The control system requires an earth ground for proper op...

Страница 8: ... replacement is required use ONLY a 3 amp fuse The control will flash code 24 when the fuse needs replacement ACCESSORIES 1 Electronic air cleaner EAC A terminal block EAC 1 hot and EAC 2 neutral is provided for EAC connection See Fig 11 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 ...

Страница 9: ...TYPE CKT BKR AMPS Max Min 065 08 115 60 1 127 104 8 0 14 46 15 065 12 115 60 1 127 104 11 0 14 33 15 085 12 115 60 1 127 104 12 0 14 30 15 085 16 115 60 1 127 104 13 2 14 28 15 105 20 115 60 1 127 104 17 2 12 33 20 125 20 115 60 1 127 104 18 4 12 31 20 Permissible limits of the voltage range at which the unit will operate satisfactorily Time delay fuse is recommended Length shown is as measured 1 ...

Страница 10: ...nse to a call for heat See Fig 14 When the high heat only switch SW 1 is on it always causes high gas heat operation when the R W W1 circuit is closed regardless of the setting of the low heat only switch SW 2 This furnace can operate as a 2 stage furnace with a single stage thermostat because the furnace control CPU includes a programmed adaptive sequence of controlled operation which selects low...

Страница 11: ...IGNITOR 115 VAC HOT SURFACE IGNITOR RELAY SPST N O 24VAC HUMIDIFIER CONNECTION 5 AMP MAX INDUCED DRAFT MOTOR 2 SPEED SHADED POLE INDUCER MOTOR RELAY SPST N O INDUCER MOTOR SPEED CHANGE RELAY SPDT BLOWER DOOR INTERLOCK SWITCH SPST N O JUNCTION BOX LIGHT EMITTING DIODE FOR STATUS CODES LOW GAS PRESSURE SWITCH SPST N O LOW HEAT PRESSURE SWITCH SPST N O LIMIT SWITCH OVERTEMPERATURE AUTO RESET SPST N O...

Страница 12: ...s of whether the R W2 circuit is closed or open The start up and shutdown functions and delays described in item 1 above apply to the 2 stage heating mode as well except for switching from low to high gas heat and vice versa a When the wall thermostat calls for heat the R W W1 circuit closes for low gas heat or the R to W1 and W2 circuits close for high gas heat The furnace control per forms a sel...

Страница 13: ...Y2 for high cooling speed 2 The EAC terminals EAC 1 and EAC 2 are energized with 115v when the blower motor BLWM is operating on either cooling speed 3 When the thermostat is satisfied the furnace blower motor BLWM continues operating on the cooling speed for an additional 90 sec c Single Speed Heat Pump Heating 1 The thermostat and accessory interface kit R to G and Y Y2 circuits start the furnac...

Страница 14: ...in average yearly specific gravity for local gas supply 3 Verify furnace model Table 8 can only be used for model 58TMA Furnaces 4 Check and verify orifice size in furnace NEVER ASSUME THE ORIFICE SIZE ALWAYS CHECK AND VERIFY 5 Find natural gas heat value and specific gravity in Table 8 6 Follow heat value and specific gravity lines to point of intersection Find orifice size and manifold pressure ...

Страница 15: ...0 Btuh Low Heat Per Burner GAS HEAT VALUE BTU CU FT SPECIFIC GRAVITY OF NATURAL GAS 0 58 0 60 0 62 0 64 0 66 0 68 0 70 0 72 Orf No Heat High Low Orf No Heat High Low Orf No Heat High Low Orf No Heat High Low Orf No Heat High Low Orf No Heat High Low Orf No Heat High Low Orf No Heat High Low 860 42 3 5 1 4 42 3 2 1 3 3 6 1 5 41 42 3 3 1 4 3 7 1 5 40 41 42 3 2 1 3 3 4 1 4 3 8 1 6 40 41 3 3 1 3 3 5 1...

Страница 16: ...346 340 333 15 16 17 18 19 240 225 212 200 189 480 450 424 400 379 1200 1125 1059 100 947 55 56 57 58 59 65 64 63 62 61 131 129 126 124 122 327 321 316 310 305 20 21 22 23 24 180 171 164 157 150 360 343 327 313 300 900 857 818 783 750 60 62 64 66 68 60 58 56 54 53 120 116 112 109 106 300 290 281 273 265 25 26 27 28 29 144 138 133 129 124 288 277 267 257 248 720 692 667 643 621 70 72 74 76 78 51 50...

Страница 17: ...urnace and set room thermostat above room temperature c After normal start up allow furnace to operate for 2 minutes then block flue outlet 100 percent Furnace should cycle off within 2 minutes d Remove blockage and reconnect vent connector to furnace flue collar e Wait 5 minutes and then reset draft safeguard switch 3 Check flow sensing pressure switches This control proves operation of draft ind...

Страница 18: ...6231 58tma3si Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 4 Tab 6a 8a PC 101 Catalog No 535 824 Printed in U S A Form 58TMA 3SI Pg 18 6 94 Replaces 58TMA 2SI ...

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