Carrier 58SS/DH - Manual (Page 3)

RETURN OR
SUPPLY AIR
pl~1
VENT TO ROOF
I I I
I I I
I
I I
* MINIMUM OPENING SIZE IS 100 SO IN. (REUIRN
+ MINIMUMOF 3 IN. WHEN TYPE-BI VENT IS USED. AIR ONLY)
Fig. 1 — Upflow or Counterflow, Using Air
from Inside Building
I so IN. PER
4000 BTUH
DUCTS
TO ROOF
I I I I
12 IN. MAX
T
I so IN. PER
2000 BTUH
DUCTS TO
OUTSIDE
I SO IN. PER
2000 BTUH
±
12 IN. MAX
T
i VENT
TO ROOF
RETURN
OR
SUPPLY
AIR
13
-12 IN.MAX
RETURN OR
SUPPLY AIR
J
5
I so IN. PER
4000 BTUH
DUCT
TO OUTSIDE
USE ANY OF THE FOLLOWING COMBINATIONS
OF OPENINGS; AaB CSD D8E
Fig. 2 — Upflow or Counterflow, Using Air
from Outside Building
GAS PIPING
Gas piping must be installed in accordance with
national and local codes.
The gas supply line should be a separate line directly
from the meter to the furnace, if possible. Referto Table 1
for recommended gas pipe sizing.
Table 1 — Maximum Capacity of Gas Pipe*
NOMINAL
IRON PIPE
SIZE
(in.)
INTERNAL
DIAMETER
(in.)
LENGTH OF PIPE (ft)
10 20 30 40 50
'k 0 622 175 120 97 82 73
% 0.824 360 250 200 170 151
1 1.049 680 465 375 320 285
r/4 1 380 1400 950 770 660 580
1V2 1 610 2100 1460 1180 990 900
'Cubic ft of gas per hour for gas pressure of 0.5 psig or less, and a
pressure drop of 0.5 in wg (based on a 0 60 specific gravity)
Ref. Table C-4 NFPA 54-1984.
Avoid low spots in long runs of pipe. It is best to slope
all pipe I/4inch in 15 ft to prevent traps. All horizontal
runs should slope away from the meter, to risers. Risers
should be used to connect to the furnace and to the meter.
Joint compounds (pipe dope) should be applied
sparingly and only to the male threads of the joints.
Consult local supplier for type of compound to be used.
This pipe dope must be resistant to the action of LP
(propane) gas.
Install a sediment trap in the riser leading to the
furnace. This trap collects dirt or condensate. It can be
installed by connecting a Tee to the riser leading to the
furnace, so that the straight through section of the Tee
is vertical. Then connect a capped nipple into the lower
end of the Tee. The capped nipple should extend below
the level of the gas controls. See Fig. 3. Where a gum filter
is required by local codes, install it in accordance with
An accessible manual shutoff valve shall be installed
upstream of the furnace gas controls and within 6 ft of the
furnace. A 1/8-in. NPT plugged tapping, accessible for
test gage connection, must be installed immediately up­
stream of the gas supply connection to the furnace, and
downstream of the manual shutoff valve.