Carrier 58ED - Step 4 - Size Ductwork; Step 5 - Vent Furnace

HEATING & COOLING
58ED,PB
Horizontal Gas-Fired Furnaces
be a wrapper, 2 panels (one marked with an “R”, the
other marked with an “L”) and a hardware package.
Refer to Fig 3 to assemble the draft hood. Depending
on the model, one or both panels are slid into the proper
location in order to line up the 4 mounting holes. Secure
the panel(s) with the screws provided
After completing the draft hood assembly, it is
advisable to check the overall size with Table 4.
Install the draft hood over the selected flue opening by
placing it on top of the draft hood clip and securing it to
the furnace jacket with screws provided. Adhere to the
necessary clearances as shown in Table 3.
Table 4 — Draft Hood Dimensions (in.)
FURNACE
58ED/PB
LENGTH
HEIGHT
DEPTH PIPE DIA.
050
16 10
8 4
075
16 10
8 4
100
16
10
8 5
125
17 Vi
10
8 5
140
17 Vi 10
8 6
Step 4 — Size Ductwork — Proper ductwork sizing
is necessary to ensure satisfactory heating operation
Ductwork should be in accordance with the latest editions
of NFPA-90A (Air Conditioning Systems) and NFPA-
90 B(Warm Air Heating and Air Conditioning Systems).
Follow these recommendations when installingductwork:
1. Install locking-type dampers in all branch or indi¬
vidual ducts to balance out system. Dampers should
be adjusted to impose the proper static pressure at
the outlet of the furnace.
2 Noncombustible flexible duct connectors are recom¬
mended to connect both the supply and return ducts
to the furnace
3 In cases where the return air grille is located close to
the fan inlet, there should be at least one 90 degree air
turn between fan and inlet grille. Further reduction
in sound can be accomplished by installing acoustical
air turning vanes and/ or lining the inside of duct with
acoustical material.
A CAUTION
Air openings in burner cover, return air grilles, and
warm air registers must not be obstructed.
A WARNING
When supply ducts carry air circulated by the furnace
to areas outside the spaces containing the furnace,
return air shall also be handled by a duct sealed to
the furnace casing and terminating outside the space
containing the furnace.
When installing the furnace with cooling equipment
for year-round operation, the following recommenda¬
tions should be followed for series or parallel airflow:
1. In series airflow applications, the coil is mounted
after the furnace in an enclosure in the supply air-
stream. The furnace blower is used for both heating
and cooling airflow.
A WARNING
The coil must be installed on the air discharge
side of the furnace. U nder no circumstance should
the airflow be such that cooled, conditioned air
can pass over the furnace heat exchanger. This
causes condensation in the heat exchanger and
possibly early failure due to rust.
2. In parallel flow installation, dampers must be pro¬
vided to direct air over the furnace heat exchanger
when heat is desired and over the cooling coil when
cooling is desired.
IMPORTANT: The dampers should be adequate
to prevent cooled air from entering the furnace,
and if manually operated, must be equipped with
means to prevent operation of either the cooling
unit or furnace unless the damper is in the
full cool or heat position.
Step 5 — Vent Furnace — This furnace must be
vented to the outside and in accordance with local codes
or requirements of the local utility. In the absence of local
codes, venting should conform to the requirements of
the National Fuel Gas Code (NFPA 54-1984/ANSI
Z223.1-1984 Part 7).
For additional venting information, refer to ANSI/
NFPA 211 Chimneys, Fireplaces, Vents and Solid Fuel
Burning Appliances.
This furnace must not be vented into a solid fuel
burning chimney. The chimney must be checked for
deterioration. Correct the condition before venting
the furnace into the chimney. The chimney must be
properly lined and sized per National Fuel Gas Code
(ANSI Z223.1-1984/NFPA-54, 1984).
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book|1 |4 PC101 Catalog No 535-834 Printed in U S A Form58ED.PB-1SI Pg4 6-85 Replaces: 58PB-1 SI
Tab l6al8a For replacement items use Carrier Specified Parts.