Servicing Hot Surface Igniter; Furnace Pressure And Drain Tubing Diagram - Carrier 58MTA Service Manual

Furnace is shipped from factory in upflow configuration. Pressure tube and drain tube routing MUST match the diagrams below.
Condensate Trap; Factory Installed
in Blower Shelf
(Blower access panel removed)
COLLECTOR BOX TUBE
(PINK)
COLLECTOR BOX TUBE
(GREEN)
INDUCER HOUSING (MOLDED) DRAIN TUBE
(BEHIND COLLECTOR BOX DRAIN TUBE)
COLLECTOR BOX DRAIN TUBE
(BLUE)
FIELD-INSTALLED
FACTORY-SUPPLIED DRAIN TUBE
COUPLING (LEFT DRAIN OPTION)
FIELD-INSTALLED FACTORY-SUPPLIED
DRAIN TUBE
Condensate Trap on
LEFT Side
CAP
COLLECTOR BOX
TUBE (GREEN)
COLLECTOR BOX DRAIN TUBE
(BLUE & WHITE STRIPED)
COLLECTOR BOX
EXTENSION TUBE
CONDENSA TE TRAP
BURNER ENCLOSURE PRESSURE
REFERENCE TUBE ASSEMBLY
INDUCER HOUSING DRAIN TUBE (VIOLET)
Tube location when used on
HORIZONTAL - LEFT application
AUXILIARY "J" BOX
PLUG
CAP
BURNER ENCLOSURE
PRESSURE REFERENCE
TUBE ASSEMBL Y
COLLECTOR BOX
EXTENSION TUBE
CONDENSA TE TRAP
COLLECTOR BOX EXTENSION DRAIN TUBE
NOTE:
1. All tubing must be connected securely and routed to avoid kinks and traps.
2. Pressure tubing must always slope away from pressure switch to collector box connection as shown.
3. HORIZONTAL-LEFT installations require the collector box pressure tube to be relocated between the inducer housing and the blower shelf to
prevent a trap. Refer to the Installation Instructions for further details.
14. Check furnace operation through 2 complete heat operating
cycles. Check area below inducer housing, vent pipe, and
condensate trap to ensure no condensate leaks occur. If leaks
are found, correct the problem.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result in
serious injury, death, or property damage.
Never test for gas leaks with an open flame. Use a commer-
cially available soap solution made specifically for the
detection of leaks to check all connections. A fire or explo-
sion may result causing property damage, personal injury, or
loss of life.
15. Check for gas leaks.
TUBE ROUTING
Tube location when used in UPFLOW application
BURNER ENCLOSURE
PRESSURE REFERENCE
TUBE ASSEMBLY
CAP
PLUG
COLLECTOR BOX DRAIN
TUBE
(BLUE & WHITE STRIPED)
CONDENSA TE TRAP
FIELD-INSTALLED
FACTORY - SUPPLIED
DRAIN TUBE COUPLING
(RIGHT DRAIN OPTION)
FIELD-INSTALLED
FACTORY-SUPPLIED 1/2-IN.
CPVC STREET ELBOWS (2)
FOR LEFT DRAIN OPTION
Tube location when used in DOWNFLOW application
COLLECTOR BOX
DRAIN TUBE (BLUE)
PLUGGED END
PLUG
COLLECTOR BOX
EXTENSION TUBE
COLLECTOR BOX
TUBE (PINK)
COLLECTOR BOX DRAIN TUBE
(BLUE & WHITE STRIPED)
COLLECTOR BOX
TUBE (GREEN)
INDUCER HOUSING
DRAIN TUBE
(VIOLET)
COLLECTOR BOX
DRAIN TUBE (BLUE)
DRAIN TUBE
COLLECTOR BOX TUBE (PINK)
COUPLING RELOCATE TUBE BETWEEN BLOWER
SHELF AND INDUCER HOUSING FOR
060 AND 080 HEA TING INPUT
FURNACES
Fig. 8—Furnace Pressure and Draining Tube Diagram
COLLECTOR BOX TUBE
(PINK)
COLLECTOR BOX TUBE (GREEN)
COLLECTOR BOX DRAIN TUBE
(BLUE)
CONDENSA TE TRAP
COLLECTOR BOX DRAIN
TUBE
(BLUE & WHITE STRIPED)
INDUCER HOUSING DRAIN
TUBE (VIOLET)
DRAIN TUBE COUPLING
DRAIN TUBES ROUTED IN
FRONT OF GAS VALVE
Tube location when used on
HORIZONTAL - RIGHT application
COLLECTOR BOX DRAIN TUBE
(BLUE)
PLUG
CAP
COLLECTOR BOX
TUBE (GREEN)
COLLECTOR BOX DRAIN TUBE
(BLUE AND WHITE STRIPED)
16. Replace main furnace door.
Step 6—Servicing Hot Surface Igniter
The igniter does NOT require annual inspection. Check igniter
resistance before removal.
1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
3. Disconnect igniter wire connection.
4. Check igniter resistance.
a. Using an ohm meter, check resistance across both igniter
leads in connector.
b. Cold reading should be between 45 ohms and 90 ohms.
c. If ohm reading is higher than 110 ohms, igniter is cracked
and must be replaced.
7
Condensate Trap on LEFT
Side Optional
BURNER ENCLOSURE
PRESSURE REFERENCE
TUBE ASSEMBLY
CAP
PLUG
COLLECTOR BOX DRAIN TUBE
(BLUE & WHITE STRIPED)
INDUCER HOUSING DRAIN TUBE
(VIOLET)
Condensate Trap on
RIGHT Side
T
PLUG
CAP
COLLECTOR BOX DRAIN TUBE
(BLUE)
COLLECTOR BOX TUBE
(PINK)
COLLECTOR BOX TUBE
(GREEN)
COLLECTOR BOX EXTENSION TUBE
BURNER ENCLOSURE PRESSU
REFERENCE TUBE ASSEMBL
CONDENSATE TRAP
COLLECTOR BOX
EXTENSION DRAIN TUBE
GAS VALVE
COLLECTOR BOX EXTENSION TUBE
COLLECTOR BOX TUBE (PINK)
AUXILIARY "J" BOX RELOCATED HERE
BURNER ENCLOSURE
PRESSURE REFERENCE
TUBE ASSEMBL Y
COLLECTOR BOX
EXTENSION TUBE
CONDENSA TE TRAP
INDUCER HOUSING DRAIN TUBE (VIOLET)
326476-201 REV. B
(lit-bottom)
A01052