magicpak MGE4-12 Series, Инструкция по установке и обслуживанию, Страница: 14 / 22

Page 14 of 22 508197-01 Issue 2137
The gas valve supplied with this furnace is rated at 1/2
psig maximum. Any higher pressure may rupture the
pressure regulator diaphragm and may cause over-
firing of the burners and improper burner operation. The
over-firing may result in the creation of carbon monoxide
which could cause asphyxiation.
WARNING
Fire or Explosion Hazard
Failure to follow the safety warnings exactly could result
in serious injury, death, or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A
fire or explosion may result causing property damage,
personal injury, or loss of life.
WARNING
Figure 9. Gas Supply Piping
Return Supply
Drip Leg (field supplied)
Ground Joint Union (field supplied)
Condensate Drain (field supplied)
Compressor /
Gauge Ports /
Outdoor Fan Access
Gas Valve and
Burners Access
Indoor Blower and
Controls Access
Manual Shutoff Valve with 1/8”
NPT Plugged Tapping; Accessible
for Test Gauge Connection
( field supplied )
Filter
Access
Pipe connections must be tight, and a non-hardening pipe
compound resistant to liquefied petroleum gases must be
used.
Connect the gas pipe to the gas pipe connection providing
a ground joint union as close to the gas pipe connection
as is possible to facilitate removal of controls and manifold.
Provide a drip leg on the outside of the furnace. A manual
shutoff valve shall be installed in the gas line, outside the
unit, 5’ above the floor, or in accordance with any local
codes.
The furnace must be isolated from the gas supply piping
system by closing the individual manual shutoff valve
during any pressure testing of the gas supply piping system
at test pressure equal to or less than 1/2 psig (3.5 kPa) or
14” W.C. If the piping system is to be tested at pressures in
excess of 1/2 psig (3.5 kPa), the furnace and its appliance
main gas valve must be disconnected from the gas supply
piping system.
After gas piping is complete, carefully check all piping
connections (factory and field) for gas leaks. Use a leak
detecting solution or other preferred means. Some soaps
used for leak detection are corrosive to certain metals.
Carefully rinse piping thoroughly after leak detection has
been completed.