GMVC9 GCVC9 Installation Instructions

30
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
COUNTERFLOW - HORIZONTAL RIGHT
Figure 40
GAS PIPING CONNECTIONS
GAS PIPING CHECKS
T O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE , NEVER USE A MATCH
OR OPEN FLAME TO TEST FOR LEAKS .
WARNING
Before placing unit in operation, leak test the unit and gas con-
nections.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other ap-
proved testing methods.
NOTE: Never exceed specified pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfiring, resulting in heat exchanger failure.
Disconnect this unit and shutoff valve from the gas supply piping
system before pressure testing the supply piping system with
pressures in excess of 1/2 psig (3.48 kPa).
Isolate this unit from the gas supply piping system by closing its
external manual gas shutoff valve before pressure testing supply
piping system with test pressures equal to or less than 1/2 psig
(3.48 kPA).
PROPANE GAS TANKS AND PIPING
I F THE GAS FURNACE IS INSTALLED IN A BASEMENT , AN EXCAVATED
AREA OR CONFINED SPACE , IT IS STRONGLY RECOMMENDED TO
CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING
DEVICE IN CASE OF A GAS LEAK .
S
INCE PROPANE GAS IS HEAVIER THAN AIR , ANY LEAKING GAS CAN
SETTLE IN ANY LOW AREAS OR CONFINED SPACES .
P
ROPANE GAS ODORANT MAY FADE , MAKING THE GAS UNDETECTABLE
EXCEPT WITH A WARNING DEVICE .
•
•
WARNING
200 PSIG
Maximum
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
Second Stage
Regulator
First Stage
Regulator
Propane Gas installation (Typ.)
Figure 41
A gas detecting warning system is the only reliable way to detect
a propane gas leak. Rust can reduce the level of odorant in pro-
pane gas. Do not rely on your sense of smell. Contact a local
propane gas supplier about installing a gas detecting warning
system. If the presence of gas is suspected, follow the instruc-
tions listed in the Safety Considerations section of this manual.
All propane gas equipment must conform to the safety standards
of the National Board of Fire Underwriters, NBFU Manual 58.
CANADA: National Standard of Canada, Natural Gas and Pro-
pane Installation Code (NSCNGPIC) CAN/CSA B149.1-15.
For satisfactory operation, propane gas pressure must be 10”
WC at the furnace manifold with all gas appliances in operation.
Maintaining proper gas pressure depends on three main factors:
1. Vaporization rate, depending on temperature of the
liquid, and “wetted surface” area of the container or
containers.
2. Proper pressure regulation. (Two-stage regulation is
recommended for both cost and efficiency).
3. Pressure drop in lines between regulators, and between
second stage regulator and the appliance. Pipe size
will depend on length of pipe run and total load of all
appliances.
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available
from most regulator manufacturers and propane gas suppliers.