Page 5
Condensate Drains
Make drain connection to the 3/4" N.P.T. drain nipple
provided on unit. A trap must be installed between drain
connection and an open vent for proper condensate
removal. See figure 5. It is sometimes acceptable to drain
condensate onto the roof or grade; however, a tee should
be fitted to the trap to direct condensate downward. The
condensate line must be vented. Check local codes
concerning condensate disposal. Refer to figures 1 and 2
for condensate drain location.
FIGURE 5
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UNIT
Minimum Pitch
1" (25mm) per
10’ (3m) of line
MOUNTING FRAME
OPEN VENT
CONDENSATE DRAIN CONNECTION
CAULK AROUND
CONDENSATE
COUPLING
Connect Gas Piping
Before connecting piping, check with gas company or
authorities
having
jurisdiction
for
local
code
requirements. When installing gas supply piping, length
of run from gas meter must be considered in determining
pipe size for 0.5" w.c. maximum pressure drop. Do not
use supply pipe smaller than unit gas connection. For
natural gas units, operating pressure at the unit gas
connection must be a minimum of 5.5" w.c. and a
maximum of 10.5" w.c. For propane gas units, operating
pressure at the unit gas connection must be a minimum
of 11" w.c. and a maximum of 13.0" w.c.
When making piping connections, a drip leg should be
installed on vertical pipe runs to serve as a trap for
sediment or condensate. A 1/8" N.P.T. plugged tap in
field piping accessible for test gauge connection must
be provided upstream of gas supply connection to the
unit. Install a ground joint union between the gas
control manifold and the main manual shut−off valve.
See figure 6.
Compounds used on threaded joints of gas piping shall
be resistant to the action of liquified petroleum gases.
GAS PIPING
SUPPORT
UNIT
FIGURE 6
FIELD PROVIDED
1/8" PRESSURE TAP
GROUND
JOINT UNION
MANUAL MAIN
SHUT−OFF VALVE
(REFER TO
LOCAL
CODES)
DRIP LEG
UNIT
SUPPORT
GAS PIPE CONNECTION
Pressure Test Gas Piping
When pressure testing gas lines, the gas valve must be
disconnected and isolated. Gas valves can be damaged if
subjected to more than 0.5 psig (14" w.c.). See figure 7.
If the test pressure is equal to or less than 0.5 psig (14"
w.c.), use the main manual shut−off valve before pressure
testing to isolate the unit from the gas supply system. If
necessary,
adjust
main
gas
supply
pressure
in
accordance
with
HConnect
Gas
Pipe"
section.
GAS VALVE
CAP
MANUAL MAIN
SHUT−OFF VALVE
FIGURE 7
PRESSURE TEST GAS VALVE
NOTE−Codes may require that manual main shut−off valve
and union (furnished by installer) be installed in gas line
external to unit. Union must be of the ground joint type.
After all connections have been made, check all piping
connections for gas leaks. Also check existing gas
connections up to the gas valve; loosening may occur
during installation. Use a soap solution or other preferred
means. Do not use matches, candles, or other sources of
ignition to check for gas leaks.
NOTE−In case emergency shut down is required, turn off
the main manual shut−off valve and disconnect main
power to unit. These devices should be properly labeled
by the installer.
