www.DaikinApplied.com 145 IM 1287-6 • REBEL APPLIED ROOFTOP
Field Gas Piping
CAUTION
Use a stabilizing wrench when installing eld gas piping in order to prevent
damage to the factory supplied manifold assembly.
DANGER
Testing for gas leaks with an open ame can cause an explosion or re
resulting in property damage, personal injury, or death. Use a commercially
available soap solution made specically for the detection of leaks to check
all connections.
WARNING
Overheating or failure of the gas supply to shut off can cause equipment
damage, severe personal injury, or death. Turn off the manual gas valve to
the appliance before shutting off the electrical supply.
WARNING
Gas Explosion Hazard
Do not attempt to connect gas lines to the condensate drain nipple. Open
furnace vestibule and positively identify the proper gas manifold connection
point. Failure to connect gas lines to the proper gas manifold connection
point may result in serious injury or death.
Figure 204: DPSA Gas Furnace Field Connection Detail
1.
1. Follow all applicable NFPA and local code requirements
for gas supply piping to the unit. Ensure pipe routing
does not interfere with downstream access doors and
general unit accessibility. Suggested routing and items
shown in Figure 204. Note that two nipples connections
are provided at the furnace section. The upper pipe
nipple is the fuel gas supply connection and is sized
based on unit input capacity. See Table 35. The lower,
¾” NPT nipple is connected to the vestibule condensate
drain pan. Only connect gas to the unit gas supply
connection point.
2. Field piping to be installed and supported such that it
does not generate any load on the factory supplied gas
train.
3. The appliance must be isolated from the gas supply
system by closing o the manual shut o valve of the gas
supply piping system during any pressure testing less
than 0.5 psi (3.5 kpa).
4. The appliance and its individual shut-o valve must be
disconnected from the gas supply system during any
pressure testing greater than or equal to 0.5 psi (3.5
kPa).
5. Regulator to be sized for the maximum total Btu input
required for the furnace.
Table 35: DPSA Gas Furnace Fuel Pipe Sizing
Furnace Capacity Gas Pipe Size
200MBH, 400MBH, 600MBH 1.25" NPT
800MBH, 1125MBH, 1500MBH 1.5" NPT
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