MN801GAS 060520
– 12 –
NATURAL GAS
Capacities in
Cubic feet per hour
for Schedule 40 metal pipe
Pipe size
(inches)
Total length of gas piping,
from meter to burner connection (feet)
20
40
60
80
100
Natural gas @ .60 specific gravity, pressure drop 0.3 in. w.c.
(note 1)
1¼
730
500
400
350
305
1½
1,100
760
610
530
460
2
2,100
1,450
1,150
990
870
2½
3,300
2,300
1,850
1,600
1,400
Natural gas @ .60 specific gravity, pressure drop 0.5 in. w.c.
(note 1)
1¼
950
660
530
460
400
1½
1,460
990
810
690
620
2
2,750
1,900
1,520
1,300
1,150
2½
4,350
3,000
2,400
2,050
1,850
Note 1
For natural gas with specific gravity other than 0.60,
consult National Fuel Gas Code for correction factor.
PROPANE GAS
Capacities in
Btuh
for
Schedule 40 metal pipe
Propane gas @ 1.5 specific gravity, pressure drop 1 psi
½
1,839
1,264
1,015
869
770
¾
3,845
2,643
2,122
1,816
1,610
1
7,243
4.978
3,998
3,422
3,033
Propane gas @ 1.5 specific gravity, pressure drop 0.5 in. w.c.
1
787
541
434
372
330
1¼
1,616
1,111
892
677
543
1½
2,422
1.664
1,337
1,114
1,014
Table 3
Capacities of black iron pipe, cubic feet gas/hour
Figure 6
Gas train pressure drop
3. Install gas piping
(continued)
Regulator spring
:
The standard main gas pressure regulator spring 1½" RV81 is plated. The range is
from 3.0 to 6.0 inches water column (or a violet spring, with a range of 4.0 to 12.0
inches water column).
4. Wire the burner — RM7897C primary control
Wire the burner
(RM7895C or RM7897C primary control only)
1. All wiring must comply with:
•
In the U.S. – the National Electrical Code, ANSI Z223.1/NFPA 54.
•
In Canada – the Canadian Electrical Code Part 1, CSA standard C22.1.
•
All applicable local codes/standards.
2. Connect the burner following Figure 8 and any special instructions or
wiring diagrams provided with the appliance, burner or other components.
3. The burner requires a 120 VAC/60 hz/single-phase control power supply,
with a 10-amp fuse. The control circuit current draw is approximately 1.2
amps. An additional power source is required for the motor (120 VAC or
208-220 VAC, 60 hz), with fuse sized accordingly. See Figure 9 for field
wiring connections.
4. Read the Honeywell RM7897C instructions for information on setting a
room thermostat, if used.
5. Make sure the burner and appliance are correctly wired and the line switch
is properly fused for the load.
