Bryant 352MAV - Manual (Page 9)

NOTE: Heat tape, when used, should be wrapped around the
condensate drain trap and drain line. There is no need to use heat
tape within the furnace casing. Most heat tapes are temperature
activated, and it is not practical to verify the actual heating of the
tape. Check the following:
1. Check for signs of physical damage to heat tape such as
nicks, cuts, abrasions, gnawing by animals, etc.
CAUTION: If this furnace is installed in an uncondi-
tioned space where the ambient temperatures may be
32°F or lower, freeze protection measures must be taken.
2. Check for discolored heat tape insulation. If any damage or
discolored insulation is evident, replace heat tape.
3. Check that heat tape power supply circuit is on.
IX. WINTERIZING
CAUTION: Freezing condensate left in the furnace will
damage the equipment.
If the furnace will be off for an extended period of time in a
structure where the temperature will drop to 32° or below,
winterize as follows:
1. Turn off electrical supply to furnace.
2. Remove main furnace door.
3. Disconnect cap from unused drain tap on inducer housing.
(See Fig. 13.)
4. Insert funnel in drain tube and pour antifreeze, propylene
glycol (RV, swimming pool antifreeze, or equivalent) into
furnace until it is visible at point where condensate enters
open drain. (See Fig. 14.)
5. Reconnect drain tube to inducer housing.
6. Replace main furnace door.
CAUTION: Do not use ethylene glycol (Prestone II
antifreeze/coolant or equivalent automotive type). Failure
of plastic components will occur.
WIRING DIAGRAM
See Fig. 15 for Wiring Diagram
TROUBLESHOOTING
Use the Troubleshooting Guide, the status code LED on the control
and the Component Test to isolate furnace operation problems.
I. STATUS CODES
For an explanation of status codes, refer to service label located on
back of main furnace door or Fig. 16. The control will store up to
5 previous codes but will not store a non-current code longer than
48 hours.
NOTE: Removing the blower access door will open the blower
access door switch and terminate 115-v power to the control is
interrupted.
To read current status code, remove main furnace door. The status
code LED can be viewed through the sight glass on the blower
access door.
NOTE: NO thermostat signals may be present at control and all
blower off delays must be expired to view previous codes.
To retrieve previous codes, remove 1 of the red main limit wires
1 to 4 sec until the LED light goes out, then reconnect it. (Do not
leave red wire disconnected for longer periods of time as the
control will assume an overtemperature condition exits and will
respond with blower operation.) This places the control in the
status recall mode and displays the first code stored in memory
Record the code and repeat the disconnect and reconnect of the red
wire, recording each code until code 11 is displayed indicating no
additional faults. After the last code is displayed or after 2 minutes
in the code, recall mode the control will return to normal standby
mode.
II. COMPONENT TEST
Use the Component Test to check furnace components for proper
operation. To initiate the component self-test sequence, shut off
the room thermostat or disconnect the “R”thermostat lead. Briefly
(approx. 2 sec) short the TWIN/TEST terminal to the C
OM 24V
terminal. The status LED will turn off. The test sequence will be
as follows:
A93058
32
°
F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED Fig. 12—Two-Stage Control
A93348
1 2 3
4 5 6
7 8 9
PR2 L2 COM
PR1 L1
EAC-2 EAC-1
H I- COO
L
HI-GAS -HEAT LO-GAS -HEAT
PARK
3 FU1
SEC-1 SEC-2
1
1 2 3
4 5 6
7 8 9
10 11 12
MASTER SLAVE
TWIN TEST LED
G
R
Y/Y2
W/W1
COM 24 V
W2
1
ON
OFF
1 2 3 4
FURNACE AND
BLOWER OFF DELAY
SETUP SWITCHES
24-VOLT
THERMOSTAT
TERMINALS
EAC - ELECTRONIC
AIR CLEANER
(115-VAC 1 AMP MAX)
3-AMP
FUSE
LED -
DIAGNOSTIC
LIGHT
TWIN / TEST
TERMINAL
HUM -
HUMIDIFIER
(24-VAC 0.5
AMP MAX)
HUM
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