Application; Condensation Drain Protection; Start-Up Adjustment And Safety Check; General - Bryant 352MAV Installation, Start-Up, And Operating Instructions Manual

B. Application
The furnace, A/C, and humidifier drains may be combined and
drained together. The A/C drain must have an external, field-
supplied trap prior to the furnace drain connection. All drain
connections (furnace, A/C, or humidifier) must be terminated into
an open or vented drain as close to the respective equipment as
possible to prevent siphoning of the equipment's drain.
See Fig. 48 for example of possible field drain attachment using
1/2-in. CPVC or PVC tee for vent and A/C or humidifier drain
connection.
Outdoor draining of the furnace is permissible if allowed by local
codes. Caution should be taken when freezing ambient may freeze
drain pipe and prohibit draining.
WARNING: Caution should be taken to prevent drain-
ing where slippery conditions may cause personal inju-
ries. Excessive condensate draining may cause saturated
soil conditions which may result in damage to plants.
VENT
COMBUSTION AIR
Fig. 46—Sidewall Termination of 12 in. or Less
(Dimension "A" is Touching or 2-in. Maximum
Separation)
VENT
COMBUSTION AIR
A
Fig. 47—Sidewall Termination of More than 12 in.
(Dimension "A" is Touching or 2-in Maximum
Separation)
COMBUSTION AIR
A
A96129
COMBUSTION AIR
A96130
C. Condensation Drain Protection
Freezing condensate left in condensate trap and drain line may
cause cracks, and possible water damage may occur. If freeze
protection is required, use condensate freeze protection accessory
or equivalent 3 to 6 watt per ft at 120-v and 40°F self-regulating,
shielded, and waterproof heat tape. See Installation Instructions
supplied with accessory or heat tape manufacturer's recommenda-
tions.
1. Fold heat tape in half and wrap on itself 3 times.
2. Locate heat tape between sides of condensate trap back.
(See Fig. 49.)
3. Use wire ties to secure heat tape in place. Wire ties can be
positioned in notches of condensate trap sides. (See Fig.
49.)
4. Wrap field drain pipe with remaining heat tape, approxi-
mately 1 wrap per ft.
5. When using field-supplied heat tape, follow heat tape
manufacturer's instructions for all other installation guide-
lines.

START-UP ADJUSTMENT AND SAFETY CHECK

CAUTION: Furnace control must be grounded for
proper operation, or control will lock out. Control is
grounded through green/yellow wire connected to gas
valve C-terminal and burner box screw.
I. GENERAL
The furnace must have a 115-v power supply properly connected
and grounded. Proper polarity must be maintained for correct
operation.
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, control status indicator light will flash rapidly
and the furnace will not operate.
The gas service pressure must not exceed 0.5 psig (14-in. wc), and
no less than 0.16 psig (4.5-in. wc).
Thermostat wire connections at R and W/W1 are the minimum
required for gas heating operation. W2 must be connected for
2-stage heating thermostats. COM, Y/Y2, and G are required for
cooling, heat pumps, and some clock thermostats. These must be
made at the 24-v terminal block on the control. (See Fig. 32.)
This furnace can be installed with either a single-stage heating or
a 2-stage heating thermostat.
For single-stage thermostats, connect thermostat W to W/W1 at
furnace control terminal block. (See Fig. 27.) For single-stage
thermostats, the control will determine, based on length of previ-
ous heating on and off cycles, when to operate in low- and high-
gas heat for optimum comfort. Setup switch-1 (SW-1) must be in
the factory-shipped OFF position. See Fig. 31 and Table 9A and
9B for setup switch information.
If a 2-stage heating thermostat is to be used, move SW-1 to ON
position at end of furnace installation. This overrides built-in
control process for selecting high and low fire and allows the
2-stage thermostat to select gas heating modes. The W2 from
thermostat must be connected to W2 on control terminal block.
(See Fig. 28 and Fig. 50A-G.)
Before operating furnace, check each manual reset switch for
continuity. If necessary, press and release button to reset switch.
The blower compartment door must be in place to complete the
115-v circuit to the furnace.
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