GMES8 GCES8 Installation Instructions
20
NOTE: Never exceed specified pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfiring, resulting in heat exchanger failure.
Disconnect this unit and shutoff valve from the gas supply piping
system before pressure testing the supply piping system with pres-
sures in excess of 1/2 psig (3.48 kPa).
This unit must be isolated from the gas supply system by closing
its manual shutoff valve before pressure testing of gas supply
piping system with test pressures equal to or less than 1/2 psig
(3.48 kPa).
PROPANE GAS TANKS AND PIPING
I
F
THE
GAS
FURNACE
IS
INSTALLED
IN
A
BASEM ENT
,
AN
EXCAVATED
AREA
OR
CON FINED
SPACE
,
IT
IS
STRONGLY
RECOM M ENDED
TO
CON TACT
A
PROPANE
SUPPLIER
TO
INSTALL
A
GAS
DETECTING
W ARNING
DEVICE
IN
CASE
OF
A
GAS
LEAK
.
S
INCE
PROPANE
GAS
IS
HEAVIER
THAN
AIR
,
ANY
LEAKING
GAS
CAN
SETTLE
IN
ANY
LOW
AREAS
OR
CON FINED
SPACES
.
P
ROPANE
GAS
ODORANT
M AY
FADE
,
M AKING
THE
GAS
UNDETECTABLE
EXCEPT
W ITH
A
W ARNING
DEVICE
.
•
•
WARNING
A gas detecting warning system is the only reliable way to detect
a propane gas leak. Rust can reduce the level of odorant in pro-
pane gas. Do not rely on your sense of smell. Contact a local
propane gas supplier about installing a gas detecting warning
system. If the presence of gas is suspected, follow the instruc-
tions in the Safety Considerat ions section of this manual.
All propane gas equipment must conform to the safety standards
of the National Board of Fire Underwriters, NBFU Manual 58.
For satisfactory operation, propane gas pressure must be 10 inch
WC at the furnace manifold with all gas appliances in operation.
M aintaining proper gas pressure depends on three main factors:
1. Vaporization rate, depending on temperature of the liquid,
and “wetted surface” area of the container or containers.
2. Proper pressure regulation. (Two-stage regulation is
recommended for both cost and efficiency).
3. Pressure drop in lines between regulators, and between
second stage regulator and the appliance. Pipe size will
depend on length of pipe run and total load of all
appliances.
Complete information regarding tank sizing for vaporization, rec-
ommended regulator settings, and pipe sizing is available from
most regulator manufacturers and propane gas suppliers.
Use a pipe thread compound that is approved for natural gas and
LP gas.
Refer to the following illustration for typical propane gas instal-
lations and piping.
200 PSIG
Maximum
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
Second Stage
Regulator
First Stage
Regulator
Propane Gas Installation (Typ.)
PROPANE GAS PIPING CHARTS
3/8" 1/2" 5/8" 3/4" 7/8" 1/2" 3/4"
10 730 1,700 3,200 5,300 8,300 3,200 7,500
20 500 1,100 2,200 3,700 5,800 2,200 4,200
30 400 920 2,000 2,900 4,700 1,800 4,000
40 370 850 1,700 2,700 4,100 1,600 3,700
50 330 770 1,500 2,400 3,700 1,500 3,400
60 300 700 1,300 2,200 3,300 1,300 310
80 260 610 1,200 1,900 2,900 1,200 2,600
100 220 540 1,000 1,700 2,600 1,000 2,300
125 200 490 900 1,400 2,300 900 2,100
150 190 430 830 1,300 2,100 830 1,900
175 170 400 780 1,200 1,900 770 1,700
200 160 380 730 1,100 1,800 720 1,500
Sizing Between First and Second Stage Regulator*
Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting.
Capacities in 1,000 BTU/hour.
Nominal Pipe Size
Schedule 40
Tubing Size, O.D. Type L
Pipe or
Tubing
Length,
Feet
3/8" 1/2" 5/8" 3/4" 7/8" 1-1/8" 1/2" 3/4" 1" 1-1/4" 1-1/2"
10 39 92 199 329 501 935 275 567 1,071 2,205 3,307
20 26 62 131 216 346 630 189 393 732 1,496 2,299
30 21 50 107 181 277 500 152 315 590 1,212 1,858
40 19 41 90 145 233 427 129 267 504 1,039 1,559
50 18 37 79 131 198 376 114 237 448 913 1,417
60 16 35 72 121 187 340 103 217 409 834 1,275
80 13 29 62 104 155 289 89 185 346 724 1,066
100 11 26 55 90 138 255 78 162 307 630 976
125 10 24 48 81 122 224 69 146 275 567 866
150 9 21 43 72 109 202 63 132 252 511 787
200 8 19 39 66 100 187 54 112 209 439 665
250 8 17 36 60 93 172 48 100 185 390 590
Pipe or
Tubing
Length,
Feet
Nominal Pipe Size
Schedule 40
Tubing Size, O.D. Type L
Sizing Between Second Stage and Appliance Regulator*
Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting.
Capacities in 1,000 BTU/hour.
C
IRCULATING
A
IR
AND
F
ILTERS
DUCTW ORK - AIR FLOW
N
EVER
ALLOW
THE
PRODUCTS
OF
COM BUSTION
,
INCLUDING
CARBON
M ONOXIDE
,
TO
ENTER
THE
RETURN
DUCT
W ORK
OR
CIRCULATION
AIR
SUPPLY
.
WARNING
Duct systems and register sizes must be properly designed for
the CFM and external static pressure rating of the furnace.
Ductwork should be designed in accordance with the recom-
mended methods of “Air Conditioning Contractors of America”
M anual D.
A duct system must be installed in accordance with Standards of
the National Board of Fire Underwriters for the Installation of Air