Propane Gas Installations - Daikin DBG Series Installation Instructions Manual

To avoid property damage or personal injury, be
sure there is no open flame in the vicinity during
air bleeding.
There will be air in the gas supply line after testing for leaks
on a new installation. Therefore, the air must be bled from
the line by loosening the ground joint union until pure gas
is expelled. Tighten union and wait for five minutes until all
gas has been dissipated in the air. Be certain there is no
open flame in the vicinity during air bleeding procedure.
The unit is placed in operation by closing the main
electrical disconnect switch for the unit.

PROPANE GAS INSTALLATIONS

To avoid property damage, personal injury
or death due to fire or explosion caused by
a propane gas leak, install a gas detecting
warning device. Since rust can reduce the level
of odorant in propane gas, a gas detecting
warning device is the only reliable way to detect
a propane gas leak. Contact a local propane
gas supplier about installing a gas detecting
warning device.
IMPORTANT NOTE: Propane gas conversion kits
must be installed to convert units to propane gas.
NOx screens must be removed before converting
to LP. Remove burner assembly and pull NOx
screens from each burner tube. When all the
screens are out, reassemble the burner assembly
without the screens.
All propane gas equipment must conform to the safety
standards of NFPA 58 - Liquefied Petroleum Gas Code.
For satisfactory operation, propane gas pressure must be
within 9.7 - 10.3 inches w.c. for high fire at the manifold
with all gas appliances in operation. Maintaining proper
gas pressure depends on three main factors:
1. Vaporization rate, which depends on (a) temperature
of the liquid, and (b) wetted surface area of the
container or containers.
2. Proper pressure regulation.
3. Pressure drop in lines between regulators, and
between second stage regulator and the appliance.
Pipe size required will depend on length of pipe run
and total load of all appliances.
WARNING
WARNING
Tanks and Piping
Complete information regarding tank sizing for
vaporization, recommended regulator settings and pipe
sizing is available from most regulator manufacturers and
propane gas suppliers.
Since propane gas will quickly dissolve white lead or most
standard com mercial compounds, special pipe dope must
be used. Shellac base compounds resistant to the actions
of liquefied petroleum gases such as Gasolac
Clyde's or John Crane
®
See the following figure for typical propane gas piping.
First Stage
Regulator
200 PSIG
Maximum
Typical propane gas piping
Roof Top Location and Installation
The gas supply piping location and installation for roof
top units must be in accordance with local codes or, in
the absence of locals codes, with ordinances of the latest
edition of the National Fuel Gas Code ANSI Z223.1/NFPA
54.
A manual gas shut off valve must be field installed external
to the roof top unit. In addition, a drip leg must be installed
near the inlet connection. A ground joint union connection
is required between the external shut off valve and the unit
connection to the gas valve to permit removal of the burner
assembly for servicing.
1. Route gas piping to unit so that it does not interfere
with the removal of access panels. Support and
align piping to prevent strains or misalignment of the
manifold assembly.
2. All units are furnished with standard female 1/2" NPT
pipe connections. The size of the gas supply piping
to the unit must be based on length of run, number
of units on the system, gas characteristics, BTU
requirement and available supply pressure. All piping
must be done in accordance with local codes or, in the
absence of local codes, with the latest edition of the
National Fuel Gas Code
ANSI Z223.1/NFPA 54.
NOTE: The gas connection size at the unit does NOT
establish the size of the supply line.
15
, Stalactic
®
are satisfactory.
®
5 to 15 PSIG
(20 PSIG Max.)
Continuous
Second Stage
Regulator
,
®
11" W.C.