Empire Comfort Systems DVC-35IP Installation instructions and owner's manual - page 7
R-3122
Page 7
Gas Supply
Check all local codes for requirements, especially for the size and
type of gas supply line required. On Natural gas lines less than 75'
(23m) long, use 1/2" (13mm) pipe; on longer runs, use 3/4"
(19mm) iron pipe or equal. On LP gas lines please consult LP gas
supplier.
Installing a New Main Gas Cock
Each appliance should have its own manual gas cock.
A manual main gas cock should be located in the vicinity of the
unit. Where none exists, or where its size or location is not
adequate, contact your local authorized installer for installation
or relocation.
Compounds used on threaded joints of gas piping shall be
resistant to the action of liquefied petroleum gases. The gas lines
must be checked for leaks by the installer. This should be done
with a soap solution watching for bubbles on all exposed connec-
tions, and if unexposed, a pressure test should be made.
Never use an exposed flame to check for leaks. Appliance
must be disconnected from piping at inlet of control valve and
pipe capped or plugged for pressure test. Never pressure test
with appliance connected; control valve will sustain damage!
A gas valve and ground joint union should be installed in the gas
line upstream of the gas control to aid in servicing. It is required
by the National Fuel Gas Code that a drip line be installed near the
gas inlet. This should consist of a vertical length of pipe tee
connected into the gas line that is capped on the bottom in which
condensation and foreign particles may collect.
Figure 7
Method of Installing a Tee Fitting Sediment Trap
The use of the following gas connectors is recommended:
— ANS Z21.24 Appliance Connectors of Corrugated Metal
Tubing and Fittings
— ANS Z21.45 Assembled Flexible Appliance Connectors of
Other Than All-Metal Construction
The above connectors may be used if acceptable by the authority
having jurisdiction.
Pressure Testing of the Gas Supply System
1. To check the inlet pressure to the gas valve, a 1/8" (3.175mm)
N.P.T. plugged tapping, accessible for test gauge connection,
must be placed immediately upstream of the gas supply con-
nection to the appliance.
2. The appliance and its individual shutoff valve must be discon-
nected from the gas supply piping system during any pressure
testing of that system at test pressures in excess of 1/2 psig (3.5
kPa).
3. The appliance must be isolated from the gas supply piping
system by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig (3.5 kPa).
Attention! If one of the above procedures results in pressures in
excess of 1/2 psig (14" w.c.) (3.5 kPa) on the appliance gas valve,
it will result in a hazardous condition.
Figure 8
Checking Manifold Pressure
Both Propane and Natural gas valves have a built-in pressure
regulator in the gas valve. Natural gas models will have a
manifold pressure of approximately 4.0" w.c. (.996kPa) at the
valve outlet with the inlet pressure to the valve from a minimum
of 5.0" w.c. (1.245kPa) for the purpose of input adjustment to a
maximum of 7.0" w.c. (1.743kPa). Propane gas models will have
a manifold pressure approximately 10.0" w.c. (2.49kPa) at the
valve outlet with the inlet pressure to the valve from a minimum
of 11.0" w.c. (2.739kPa) for the purpose of input adjustment to a
maximum of 13.0" w.c. (3.237kPa).
A 1/8" N.P.T. plugged tapping, accessible for test gauge connec-
tion, is located on the outlet side of the gas control.
The built-in regulator comes on at approximately 1/4th pressure
and full on in 10 seconds.
High Altitudes
For altitudes/elevations above 2,000 feet (610m), input ratings
should be reduced at the rate of 4 percent for each 1,000 feet
(305m) above sea level. For Canadian high altitude applications,
this appliance is suitable for installation at elevations between 0
feet (0m) and 4,500 feet (1,372m) without change.
Piezo Pilot Ignitor Instructions
Depressing the red button completely causes a spark to occur at
the pilot. This is a substitute for a match which requires opening
the pilot hole cover.
To light the pilot, it is important that the electrode be 1/8" (3mm)
from the thermocouple. The spark must occur at the point the
burner flame hits the thermocouple. The end of the electrode will
be red hot with the pilot on.
On a new installation with air in the gas line, it is suggested that
a match be used. The match will light the pilot faster than the
piezo under this condition.
Proper Pilot Flame
The correct pilot flame (Figure 9) will be blue, extending past the
thermocouple. The flame will surround the thermocouple just
below the tip.
Natural gas pilots require adjusting when the inlet gas pressure is
above 5" w.c. (1.245kPa). Remove the pilot cover screw on the
control valve (Figure 8), and turn the adjustment screw clockwise
to reduce flame. Replace pilot cover screw to eliminate gas
leaking at that control valve opening.
LP gas (propane) will not require adjustment.
After use, cleaning may be required for the proper flame.