Carrier GAS FURNACE 58MTA Скачать руководство пользователя страница 34

Страница: 34 / 52

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 D1785, D2466 or D2846. CPVC or PVC cement must
conform to ASTM D2564 or F493. Primer must conform to ASTM
F656. In Canada, use CSA or ULC listed 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
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. 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.

PERSONAL INJURY AND PROPERTY DAMAGE
HAZARD
Failure to follow this warning could result in property damage
and personal injury or death.
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. 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, approximately

1 wrap per ft.

5. When using field-supplied heat tape, follow heat tape manu-

facturer’s instructions for all other installation guidelines.

START-UP ADJUSTMENT AND SAFETY CHECK

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

grounded

through

green/yellow wire connected to gas valve C-terminal and
burner box screw.

Step 1—General

The furnace must have a 115-v power supply properly connected
and grounded.

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.