The furnace and its individual shutoff valve must be dis'con
nected from the gas supply piping system during any pressu�e
of that system at test pressures in excess of
1 /2
ps1g
(3.48
.
The furnace must be isolated from the gas supply piping
system by closing its individual external manual shutoff valve
during any pressure testing of the gas supply piping system at
pressures equal to or less than
1 /2
psig
(3.48
kPa).
Gas piping may be connected from either side of the furnace.
Sizing and installation of the supply gas line should comply with
the local utility requirements. The gas supply should be a
separate line, installed in accordance with the National Fuel
Gas Code, ANSI
Z223. 1
or CAN
1
·
8
1 49. 1
or .2 installation
Codes (latest editions).
Some utility companies require pipe sizes larger than. the
maximum sizes listed. Using the properly sized wrought non,
steel or approved flexible pipe, make gas connections to the
unit. Installation of a drop leg and ground union joint is required
{see Figure
9).
WARNING:
Compounds used on threaded joints of gas piping
must be resistent to the action of liquified petroleum gases.
After connections are made, leak-test all pipe connections.
TOGAS
SUPPlY
GAOUND J(){l{f U'IION
1M Y BE INST AliED
DROP lEG
INSIDE OR OVTSlOE UNIT
*NOTE:
Unit is supplied with
a
112'
'street ell.' Wher
e
•strE*t ell's' are not allowed,
a pipe nipple and elbow may
be
used. Use
of
nipple and elbow may require field
extending side opening
of
casing for proper clearance.
FlGURE
9-
GAS PIPING
WARNING:
Do not use an open flame or other source of
ignition for leak testing. Set the manual gas valve to the
OFF
position.
INLET GAS PRESSURE
-
-
Natural
Gas
Minimum
4.51n. W.C.
111n.W.C.
Maximum
10.51n. W.C.
1 3.5
ln.
W.C.
CONDENSATE PIPING
The condensate drain connection assembly is located in the
lower right front corner of the blower compartment. It consists
of a mounting bracket and
1 12•
CPVC coupling {ASTM
02846)
with flexible tubing connected to it {see Figure
1 0).
Another
knockout is provided above the original location if the added.
height is necessary. New holes must be drilled for the screws
if this alternate location is used,
The·installatiortprocedure for condensate piping is as follows:
1. Determine whether the condensate -drain line will be in
stalled through the right or left side of !he furnace.
Unitary Products Group
650.65-N2
2.
Carefully remove the
3/4"
.diameter knockout from the
appropriate side of the furnace. Two knockouts are pro·
vided on each side, one located toward the lower right front
of the blower compartment, the other is located above the
first.
Dra·in
Hoses
Remove hose her . E:ievate
as
s
h
o
w
n
to
a l.evel above
the top of the drain trap
and
use
funnel
to
fill
with w
a
t
e
r
.
Rem
o
ve these tw:
screws to
change
co
n
de
nsat
e
dra1n
connection to
the
lett side.
NOTE:
Trap is shown exposed but may be behind
controls box.
FIGURE 10 ·CONDENSATE DRAIN CONNECTION
3.
For !eft side or alternate drain connection, it will
be
neces
sary to relocate the condensate drain connection assembly.
a. Remove the two screws that secure the drain connec
tion bracket to the right side panel {see Figure
1 0).
b. Position the bracket over the corresponding holes in
the left side panel (new holes must
be
drilled for alter
nate locations), and fasten it to the side panel using the
two screws previously removed.
c. Make sure the flexible tubing between the drain trap
mounted on the blower and the drain connection as
sembly has a continuous downward slope to the drain
connection assembly, has no low spots, and is no:
kinked. (If necessary, shorten the flexible tubing tc
prevent kinking and/or low spots that could restrict thE
flow of condensate.
·
4.
Connect field-supplied piping to the condensate drair
connection assembly and run it to an open drain. Refer tc
the "Vent/Combustion Air Connections• section of this
instruction for procedure for assembly. of plastic pipe. ThE
manufacturer recommends 112•
I.D. CPVC
or equivalent
field installed drain pipe. The· condensate piping may
be
tied together with the air conditioning condensate drainii
the air conditioning condensate drain line is trapped up
stream of the tie-in and the combined drains are con·
structed of the same material.;·
5.
All pipe joints must
be
cleaned, de:-bi.lrred and cemeotec
using CPVC primer and cement.
.. -<
6.
The furnace contains an internal trap. Therefore, no exter
nat trap should be used.
7.
If a condensate pump is used
:
it must be suit
�
b!e for usE
with acidic water.
8.
Where required,
a
field-�t.ipplied neutralizer can
be
in
stal!ed in the drain line, external to the furnace .
