Condensation Drain Protection; Sequence Of Operation - Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual

Fig. 41—Rooftop Termination (Dimension "A" is Touching or 2-in. Maximum Separation)
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.
Caution should be taken to prevent draining where slippery
conditions may cause personal injuries. Excessive condensate
draining may cause saturated soil conditions which may result
in damage to plants.
CONDENSATE 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. 47.)
3. Use wire ties to secure heat tape in place. Wire ties can be
positioned in notches of condensate trap sides. (See Fig. 47.)
4. Wrap field drain pipe with remaining heat tape, approximately
1 wrap per ft.
5. When using field-supplied heat tape, follow heat tape manu-
facturer's instructions for all other installation guidelines.
Step 11—Sequence of Operation
→
Furnace control must be grounded for proper operation, or
control will lock out. Control is grounded through
green/yellow wire connected to gas valve and burner box
screw. Failure to follow this catuion will result in intermittent
unit operation.
Using schematic diagram, follow sequence of operation through
different modes. (See Fig. 30.) Read and follow wiring diagram
carefully.
NOTE: If a power interruption occurs during a call for heat (W),
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 status code 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.
A
Fig. 42—Concentric Vent and Combustion-Air Roof
Termination (Dimension "A" is Touching or
2-in. Maximum Separation)
COMBUSTION AIR
Fig. 43—Concentric Vent and Combustion-Air Side
Termination (Dimension "A" is Touching or
2-in. Maximum Separation)
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.
34
A96128
VENT
VENT
A
COMBUSTION
AIR
A93056
1" MAXIMUM
(TYP)
VENT
A
VENT
A93057