Lochinvar COPPER-FIN 497 - 2067 - Manual (Page 23)

23
3
Gas connections
(continued)
Gas connection
All gas connections must be made with pipe joint compound
resistant to the action of liquefied petroleum (L.P.) and natural
gases. All piping must comply with local codes and ordinances.
Piping installations must comply with approved standards and
practices.
1. Make sure gas line is a separate line direct from the meter
unless the existing gas line is of sufficient capacity. Verify
pipe size with your gas supplier.
2. Use new, properly threaded black iron pipe free from
chips. If you use tubing, make sure the ends are cut
square, deburred and clean. Make all tubing bends smooth
and without deformation. Avoid flexible gas connections.
Internal diameter of flexible lines may not provide unit with
proper volume of gas.
3. Install a manual main gas shutoff valve at the unit’s gas inlet,
outside of the unit.
4. Run pipe or tubing to the unit’s gas inlet. If you use tubing,
obtain a tube to pipe coupling to connect the tubing to the
unit’s gas inlet.
5. Install a sediment trap in the supply line to the unit’s gas
inlet (see FIG. 3-1).
6. Apply a moderate amount of good quality pipe compound
(do not use Teflon tape) to pipe only, leaving two end
threads bare.
7. Remove seal over gas inlet to unit.
8. Connect gas pipe to inlet of unit. Use wrench to support gas
manifold on the unit.
9. For L.P. gas, consult your L.P. gas supplier for expert
installation.
10. Ensure that all air is completely bled from the gas line before
starting the ignition sequence. Start up without properly
bleeding air from the gas line may require multiple reset
functions of the ignition control module to achieve proper
ignition.
ƽ WARNING
Do not have any open flame in proximity to
the gas line when bleeding air from the gas
line. Gas may be present.
TABLE 3C
FITTINGS TO EQUIVALENT STRAIGHT PIPE
Diameter
Pipe
(inches)
3/4 1 1 1/4 1 1/2 2 3 4 5
Equivalent
length of
Straight Pipe
(feet)
2 2 3 4 5 10 14 20
TABLE 3B
SUGGESTED GAS PIPE SIZE FOR
SINGLE UNIT INSTALLATIONS
MODEL
Distance from Meter (in feet)
0 - 50 51 - 100 101 - 200 201 - 300 301 - 500
497 1 1/4'' 1 1/4'' 1 1/2'' 2'' 2''
647 1 1/4'' 1 1/2'' 2'' 2'' 2 1/2''
747 1 1/2'' 2'' 2'' 2 1/2'' 2 1/2''
987 2'' 2'' 2 1/2'' 2 1/2'' 3''
1257 2'' 2 1/2'' 2 1/2'' 3'' 3''
1437 2 1/2'' 2 1/2'' 3'' 3'' 3 1/2''
1797 2 1/2'' 3'' 3'' 3 1/2'' 3 1/2''
2067 2 1/2'' 3'' 3'' 3 1/2'' 4''
For each elbow or tee, add equivalent straight pipe to total length from Table 3C.
Gas train and controls
NOTICE
The gas train and controls assembly
provided on this unit have been tested under
the applicable American National Standard
to meet minimum safety and performance
criteria such as safe lighting, combustion
and safety shutdown operation.
COMBINATION
VALVE
TO BURNERS
497 MODEL
COMBINATION
VALVE
DOWNSTREAM
TEST VALVE
TO BURNERS
DOWNSTREAM
TEST VALVE
2067 MODEL
Figure 3-2_Gas train drawing
Water heater models do not have downstream test valves, but
the rest of the gas train is represented by FIG. 3-2.
Installation & Service Manual