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. 58 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: PERSONAL INJURY HAZARD
Caution should be taken to prevent draining where slippery conditions could cause personal injuries.
Excessive condensate draining may cause saturated soil conditions which could result in damage to plants.
C.
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 120v and 40°F self-regulating, shielded, and waterproof heat tape.
See Installation Instructions supplied with accessory or heat tape manufacturer’s recommendations.
1. Fold heat tape in half and wrap on itself 3 times.
2. Locate heat tape between sides of condensate trap back. (See Fig. 59.)
3. Use wire ties to secure heat tape in place. Wire ties can be positioned in notches of condensate trap sides. (See Fig. 59.)
4. Wrap field drain pipe with remaining heat tape, approximately 1 wrap per ft.
5. When using field-supplied heat tape, follow heat tape manufacturer’s instructions for all other installation guidelines.
START-UP, ADJUSTMENTS AND SAFETY CHECK
PROCEDURE 1—GENERAL
1. 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 center LED status light will flash rapidly and furnace
will not operate.
2. Thermostat wire connections at terminals R, W, G, and Y must be made at 24-v terminal block on furnace control.
3. Natural gas service pressure must not exceed 0.5 psig (14-in. wc), but must be no less than 0.16 psig (4.5-in. wc).
4. Blower access panel must be in place to complete 115-v electrical circuit to furnace.
CAUTION: UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent unit operation.
These furnaces are equipped with a manual reset limit switch in burner box. This switch will open and shut off power to gas control
valve if an overheat condition (flame rollout) occurs in burner enclosure. Correct inadequate combustion-air supply or improper venting
condition and reset switch. DO NOT jumper this switch.
Fig. 58—Example of Field Drain Attachment
A94054
OPEN STAND
PIPE FOR
A/C OR
HUMIDIFIER
DRAIN
TEE
TO OPEN
DRAIN
Fig. 59—Condensate Trap Heat Tape
A93036
CONDENSATE TRAP
WIRE TIE(S)
HEAT TAPE
(3 WRAPS MINIMUM)
—54—
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