Prime Condensate Trap With Water; Purge Gas Lines; Sequence Of Operation; Single-Stage Thermostat And Two-Stage Heating (Adaptive Mode) - Bryant 355MAV Installation, Start-Up, And Operating Instructions Manual

SETUP
SWITCH NO.
SW1-1 Status Code Recovery
SW1-2 Adaptive Heat Mode
SW1-3
SW1-4 Comfort/Efficiency Adjustment
SW1-5 CFM per ton adjust
SW1-6 Component Self-Test
SW1-7
SW1-8
4. Replace main furnace door and blower access panel.
NOTE: If a bypass humidifier is used, setup switch SW1-3 (Low
HEAT Rise Adjust) should be in ON position. This compensates
for the increased temperature in return air resulting from bypass.
NOTE: If modulating dampers are used, blower motor automati-
cally compensates for modulating dampers.
III. PRIME CONDENSATE TRAP WITH WATER
CAUTION: UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent
unit operation or performance satisfaction.
Condensate trap must be PRIMED or proper draining
may not occur. The condensate trap has 2 internal
chambers which can ONLY be primed by pouring water
into the inducer drain side of condensate trap.
1. Remove upper inducer housing drain connection cap. (See
Fig. 52.)
2. Connect field-supplied 1/2-in. ID tube to upper inducer
housing drain connection.
3. Insert field-supplied funnel into tube.
4. Pour 1 quart of water into funnel/tube. Water should run
through inducer housing, overfill condensate trap, and flow
into open field drain. (See Fig. 53.)
5. Remove funnel and tube from inducer housing and replace
drain connection cap and clamp.
IV. PURGE GAS LINES
If not previously done, purge the lines after all connections have
been made and check for leaks.
Fig. 51—Example of Setup Switch in OFF Position
TABLE 9—FURNACE SETUP SWITCH DESCRIPTION
SWITCH NORMAL
NAME POSITION
Low Heat
Rise Adjust
Blower OFF delay ON or OFF
Blower OFF delay ON or OFF
A04001
Turn ON to retrieve up to 7 stored status codes for troubleshooting
OFF
assistance when R thermostat lead is disconnected.
Allows 2-stage operation with a single stage thermostat.
Turn ON when using 2 stage thermostat to allow Low Heat opera-
OFF
tion when R to W/W1 closes and High Heat operation when R to
Turn ON to increase Low Heat airflow by 18 percent. This compen-
OFF sates for increased return air temperature caused with bypass hu-
Turn ON to decrease Low Heat airflow by 7 percent and High Heat
ON airflow 8 percent for maximum comfort. On 040 unit will decrease
Low-Heat Airflow 11 percent and High-Heat Airflow 10 percent.
OFF Turn ON for 400 CFM per ton. Turn OFF for 350 CFM per ton.
Turn ON to initiate Component Self-Test for troubleshooting assis-
OFF tance when R thermostat lead is disconnected.
Turn OFF when Self-Test is completed.
Control blower Off Delay time. Used in conjunction with SW1-8. See
Control blower Off Delay time. Used in conjunction with SW1-7. See
TABLE 10—BLOWER OFF DELAY SETUP SWITCH
DESIRED HEATING
MODE BLOWER
OFF DELAY (SEC)
90
120
150
180
WARNING: FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in a fire,
explosion, personal injury, or death.
Never purge a gas line into a combustion chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection
of leaks to check all connections.
V. SEQUENCE OF OPERATION
CAUTION: UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent
unit operation.
Furnace control must be grounded for proper operation,
or control will lock out. Control is grounded through
green/yellow wire routed to gas valve and burner box
screw.
Using schematic diagram, follow sequence of operation through
different modes. (See Fig. 31.) Read and follow wiring diagram
carefully.
NOTE: If a power interruption occurs during a call for heat
(W/W1 or W/W1-and-W2), the control will start a 90-second
blower-only ON period two seconds after power is restored, if the
thermostat is still calling for gas heating. The amber LED light will
flash code 12 during the 90-second period, after which the LED
will be ON continuous, as long as no faults are detected. After the
90-second period, the furnace will respond to the thermostat
normally.
The blower door must be installed for power to be conducted
through the blower door interlock switch ILK to the furnace
control CPU, transformer TRAN, inducer motor IDM, blower
motor BLWM, hot-surface igniter HSI, and gas valve GV.
A. Single-Stage Thermostat and Two-Stage
Heating (Adaptive Mode)
See Fig. 28 or 61 for thermostat connections
—37—
DESCRIPTION
OF USE
W/W1 and W2 close.
midifier.
Table 10.
Table 10.
POSITION
SETUP SWITCH (SW1-7 AND SW1-8) POSITION
SW1-7
OFF
ON
OFF
ON
SW1-8
OFF
OFF
ON
ON