Gas Supply - Lochinvar COPPER-FIN II CF401 Designer's Manual

The combustion air inlet of the outdoor cap
must be located at least one foot (0.30m)
above grade and above normal snow levels.
The water heater must be at least 10 feet
(3.05m) away from any forced air inlet and
at least 3 feet (0.91m) outside any overhang.
Do not install in locations where rain from
building runoff drains will spill onto the
water heater.
Lochinvar must furnish an outdoor vent kit
in accordance with CSA international
requirements. Each kit includes the flue
outlet/combustion air inlet, assembly, gasket
and pump cover.
(TABLE I) - OUTDOOR VENT KIT PART NUMBERS
MODEL
NUMBER
CF401
CF501
CF651
CF751
CF991
CF1261
CF1441
CF1801
CF2071
Nominal Iron
Pipe Size, Inches 10 20
3 /
4
369 256
1
697 477
1
1 /
1,400 974
4
1
1 /
2,150 1,500
2
2
4,100 2,820
1
2 /
6,460 4,460
2
3 11,200 7,900
1 23,500 16,100 13,100 11,100 10,000
3 /
2
Maximum capacity of pipe in thousands of BTU's per hour for gas pressures of 14" Inches Water Column (0.5 PSIG) or less and a total
system pressure drop of 0.05 Inch Water Column (Based on NAT GAS, 1025 BTU's per Cubic Foot of Gas and 0.60 Specific Gravity).
L o c h i n v a r
D E S I G N E R
Freeze Protection-
Outdoor Installation
A snow screen should be installed to prevent
snow and ice accumulation around the
appliance or its venting system.
If for any reason the unit is to be shut off:
(a.) Shut off water supply.
(b.) Drain unit completely.
(c.) Drain pump and piping.
If freeze protection is not provided for the
system, a low ambient temperature alarm or
automatic drain system is recommended.

GAS SUPPLY

1. The gas pressure regulator supplied is for
low pressure service. If upstream pressure
exceeds 6 oz. (10.5" water column), an
PART NUMBER
intermediate gas pressure regulator, of the
0DK3052
lock up type, must be installed.
0DK3052
0DK3053
2. The gas line should be a separate line
ODK3053
ODK3049
direct from meter, unless the existing
ODK3050
gas line is of sufficient capacity. Verify
ODK3050
pipe size with your gas supplier.
ODK3051
ODK3051
(TABLE J) – GAS SUPPLY PIPE SIZING
Length of Pipe In Straight Feet
30 40 50 60 70
205 174 155 141 128
384 328 292 267 256
789 677 595 543 502
1,210 1,020 923 830 769
2,260 1,950 1,720 1,560 1,440 1,330
3,610 3,100 2,720 2,460 2,310 2,100
6,400 5,400 4,870 4,410 4,000 3,800
9,000 8,300 7,690
' -
S G U I D E C O P P E R F I N I I W A T E R H E A T E R
80 90 100 125 150
121 113 106 95 86
246 210 200 179 164
472 441 410 369 333
707 666 636 564 513
1,250 1,180 1,100 974
2,000 1,900 1,700 1,540
3,540 3,300 3,000 2,720
7,380 6,870 6,150 5,640
6 1 5 - 8 8 9 - 8 9 0 0
175 200
79 74
149 138
308 287
472 441
871 820
1,400 1,300
2,500 2,340
5,130 4,720
1 7