Condensate Drain; General; Application; Condensation Drain Protection - Carrier 58MXA Nstallation, Start-Up, And Operating Instructions

OVERHANG OR ROOF
12" MINIMUM
VENT
90°
BRACKET
COMBUSTION-AIR
Fig. 39—Sidewall Termination of 12 in. or More
OVERHANG OR ROOF
12" MINIMUM
VENT
90°
BRACKET
COUPLING
COMBUSTION-AIR
(ELBOW PARALLEL
TO WALL)
Fig. 40—Sidewall Termination of Less than 12 in.
Unit must not be installed, operated, and then turned off and
left in an unoccupied structure during cold weather when
temperature drops to 32°F and below unless drain trap and
drain line have adequate freeze protection. See Service and
Maintenance Instructions for winterizing procedure. (See Fig.
15.)
Step 10—Condensate Drain

GENERAL

Condensate trap is shipped installed in the blower shelf and factory
connected for UPFLOW applies Condensate trap must be RELO-
CATED for use in DOWNFLOW and HORIZONTAL applica-
tions.
Condensate trap MUST be used for all applications.
12 IN. SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR AND
BOTTOM OF VENT
MAINTAIN 12 IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.
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12 IN. SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR AND
BOTTOM OF VENT
MAINTAIN 12 IN.
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
GREATER.
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31
An external trap is not required when connecting the field drain to
this condensate trap.
The field drain connection (condensate trap or drain tube coupling)
is sized for l/2-in. CPVC, 1/2-in. PVC, or 5/8-in. ID tube
connection.
→
Drain pipe and fittings must conform to ANSI standards and
ASTM as shown in Table 5. In Canada, use CSA or ULC certified
schedule 40 CPVC or PVC drain pipe, fittings, and cement.
When a condensate pump is required, select a pump which is
approved for condensing furnace applications. To avoid conden-
sate spillage, select a pump with an overflow switch.
Furnace condensate is mildly acidic, typically in the pH range of
3.2 to 4.5. Due to corrosive nature of this condensate, a condensate
38 pH neutralizing filter may be desired. Check with local
authorities to determine if a pH neutralizer is required.

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. 46 for 2 of possible field drain attachment using 1/2-in.
CPVC or PVC tee for vent and A/C or humidifier drain connec-
tion.
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.
Fig. 41—Rooftop Termination (Dimension "A" is
Touching or 2-in. Maximum Separation)
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.

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.
A
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