Heat Controller TGC Series, Руководство по установке

Страница: 13 / 52

1 3
In m a king g a s connections, a void str a ins a s they m a y c a use noise a nd d a m a ge the con-
trols. A b a ckup wrench is required to be used on the v a lve to a void d a m a ge.
The c a p a cities of g a s pipe of different di a meters a nd lengths in cu. ft. per hr. with pres-
sure drop of 0. 3 in. a nd specific gr a vity of 0.60 (n a tur a l g a s) a re shown in T a ble 1.
After determining the pipe length, select the pipe size which will provide the minimum
cubic feet per hour required for the g
a s input r a ting of the furn a ce. By formul a :
Gas Input of Furnace
(BTU/HR)
Cu. Ft. Per Hr. Required =
Heating Value of Gas
(BTU/FT
3 )
The g a s input of the furn a ce is m a rked on the furn a ce r a ting pl a te. The he a ting v a lue of
the g a s (BTU/FT 3 ) m a y be determined by consulting the loc a l n a tur a l g a s utility or the
L.P. g a s supplier.
B. LP CONVERSION
Convert the v a lve to use liquefied petroleum (LP) g a s by repl a cing the pressure regul a tor
spring with the conversion kit spring. This LP kit spring a llows the regul a tor to m a int a in the
proper m a nifold pressure for LP g a s. The correct burner LP orifices a re included in the kit.
S ee Figure 14.
IMPORTANT: To remove the g a s v a lve, remove the four screws securing the m a nifold pipe
to the burner tr a y. Remove the m a nifold pipe with g a s v a lve a tt a ched. S ee Figure 15.
NOTE: Order the correct LP conversion kit from the furn a ce m a nuf a cturer.
See
Conversion Kit Index shipped with unit for proper LP kit number. Furnace conver-
sion to LP gas must be performed by a qualified technician.
C. NOx MODELS
When converting units equipped with NOx inserts to LP g a s, the st a inless steel screen
mesh inserts in the entr a nce of the tubul a r exch a ngers a re not required to meet S CAQMD
NOx emission levels. These inserts a nd 1/ 8 di a meter ret a ining rod should be c a refully
removed before firing this furn a ce on LP g a s. IMPORTANT: This furn a ce is not designed to
oper a te on LP g a s with the NOx inserts in pl a ce.
S tep by step instructions on removing the NOx inserts a nd ret a ining rod a re included in the
Conversion Kit Inst a ll a tion Instructions.
!
WARNING
FACTORY FOR USE ON NATURAL GAS ONLY. CONVERSION TO LP GAS
REQUIRES A SPECIAL KIT SUPPLIED BY THE DISTRIBUTOR OR MANUFACTUR-
ER. MAILING ADDRESSES ARE LISTED ON THE FURNACE RATING PLATE,
PARTS LIST AND WARRANTY. FAILURE TO USE THE PROPER CONVERSION
KIT CAN CAUSE FIRE, CARBON MONOXIDE POISONING, EXPLOSION, PERSON-
AL INJURY, PROPERTY DAMAGE OR DEATH.
Maximum capacity of pipe in thousands of BTU per hour of undiluted liquefied petroleum
gases (at 11 inches water column inlet pressure).
(Based on a Pressure Drop of 0.5 Inch Water Column)
TABLE 2
LP GAS PIPE CAPACITY TABLE (CU. FT./HR.)
Nominal
Iron Pipe
Size, Inches
10 20 30 40 50 60 70 80 90 100 125 150
275 189 152 129 114 103 96 89 83 78 69 63
567 393 315 267 237 217 196 182 173 162 146 132
1,071 732 590 504 448 409 378 346 322 307 275 252
2,205 1,496 1,212 1,039 913 834 771 724 677 630 567 511
3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023 976 866 787
6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496
1/2
3/4
1
1-1/4
1-1/2
2
Length of Pipe, Feet
Example (LP): Input BTU requirement of unit, 150,000
Equivalent length of pipe, 60 ft. = 3/4 IPS required.