Carrier 58MSA Installation, Start-Up, And Operating Instructions Manual page 32

BLOWER OFF-DELAY
J2 JUMPER
24-V THERMOSTAT
TERMINALS
3-AMP FUSE
LED OPERATION &
DIAGNOSTIC LIGHT
115-VAC(L2)NEUTRAL
CONNECTIONS
COOL
HEAT
SPARE-1
BLOWER SPEED
SELECTION TERMINALS
NOTE: All pipe joints must be cemented except attachment of
combustion-air inlet pipe to inlet housing connection, since it may
be necessary to remove pipe for servicing.
Install combustion air inlet pipe as follows:
1. Assemble combustion-air inlet pipe.
a. Permanently install perforated disk assembly (factory-
supplied in loose parts bag) in combustion-air elbow using
RTV or by cementing. (See Fig. 35.)
For 120,000 Btuh size units only: Separate the 2 halves of
perforated disk assembly and use only the shouldered disk
half.
b. Determine length of straight portion of combustion-air inlet
pipe from table in Fig. 35.
c. Cut field-supplied 2-in diameter PVC pipe to determined
length.
d. Permanently attach elbow/perforated disk assembly to
straight portion of pipe using RTV or by cementing. (See
Fig. 35.)
2. Attach combustion-air inlet pipe.
a. Determine location of combustion-air intake pipe connec-
tion to combustion-air intake housing as shown in Fig. 34
for application.
TWINNING AND/OR
COMPONENT TEST
TERMINAL
BLOWER OFF-DELAY
TEST/TWIN
HUM
0.5 AMP@24VAC
FUSE 3-AMP
SEC-2 SEC-1
EAC-2 L2
1-AMP@
SPARE-1 SPARE-2 EAC-1
115VAC
SPARE-2
VOLTAGE CONNECTION
EAC-1 TERMINAL
(115-VAC 1.0 AMP MAX.)
Fig. 33—Furnace Control
PR-1
PL2 1
115 VAC (L1) LINE
b. Reposition combustion-air intake housing plug fitting in
appropriate unused intake housing connection.
c. Install pipe support (factory-supplied in loose parts bag)
into selected furnace casing combustion-air pipe hole. Pipe
support should be positioned at bottom of casing hole.
d. Insert assembled combustion-air inlet pipe into intake
housing.
e. Make sure elbow is oriented in an acceptable direction and
that the minimum clearance of 3 in. is observed. (See Fig.
34.)
f. Drill a 1/8-in. hole in 2-in. combustion-air inlet pipe using
hole in intake housing as a guide.
g. Install a field-supplied No. 6 or No. 8 sheet metal screw
into combustion-air pipe.
h. Install casing hole filler cap (factory-supplied) in loose
parts bag) in unused combustion-air pipe casing hole.
NOTE: Do not attach combustion-air intake pipe permanently to
combustion-air intake housing since it may be necessary to remove
pipe for service of igniter or flame sensor.
COMBUSTION-AIR INTAKE HOUSING PLUG
FITTING
The combustion-air intake plug fitting must be installed in
unused combustion-air intake housing. This fitting must be
32
HUMIDIFIER TERMINAL
(24-VAC 0.5 AMP MAX.)
TRANSFORMER 24-VAC
CONNECTIONS
PL1-LOW VOLTAGE MAIN
HARNESS CONNECTOR
PL2-HOT SURFACE
IGNITER & INDUCER
MOTOR CONNECTOR
A02100