Air Flow - ECR International G95V Installation Manual And Operating Instructions

Any adjustments to the burner manifold pressure
should be carried out with the use of a manometer
or calibrated magnehelic gauge. Do not adjust the
gas valve pressure regulator more than ±0.3" w.c.
IMPORTANT: Never adjust the input of the furnace
to exceed the input shown on the rating plate.
In the previous example where the heating value of
the gas is 1100 BTU/cu. ft., the burner manifold pres-
sure can be reduced 3% to 3.4" w.c., which is within
the ±0.3" w.c. specification to bring the input into
compliance. Refer also to "Setting the Gas Manifold
Pressure" and "High Altitude in the Gas Supply &
Piping" section of this manual. Contact the fuel sup-
plier for specific gas heating content values.
For proper furnace operation, air flow over the heat
exchanger is of utmost importance. Insufficient
airflow accelerates metal fatigue and failure in the
heat exchanger and excessive airflow promotes
accelerated corrosion of the heat exchanger.
IMPORTANT: Do not bypass this step of the
start up procedures.
TABLE 1A - RANGE OF TEMPERATURE RISE
Furnace Model
60, 80, 100, 120
TABLE 1B - AIR FLOW FOR TEMPERATURE RISE
Furnace High Fire (HF) CFM Required for a ▲T of:
Model
35
60 1501
80 2001
100 2502
120 3002
Furnace Low Fire (LF) CFM Required for a ▲T of:
Model
25
60 901
80 1201
100 1501
120 1801
TEMPERATURE RISE CHECK
When the duct system is complete and the air filter or
filters are in place, determine if the airflow is correct
for both low and high fire input rates..

20 - AIR FLOW

Temperature Rise
High Fire (HF) 35 - 65°F
Low Fire (LF) 25 - 55°F
45 55 65
1167 955 808
1557 1274 1078
1946 1592 1347
2335 1910 1616
35 45 55
700 573 485
934 764 647
1167 955 808
1401 1146 970
Heating Value of Gas x 3600
Input =
Time in Sec. for 1 cu. ft.
where:
• input is expressed in BTU/Hr
• heating value of the gas is expressed in BTU/ft
• and time is the number of seconds required for
the test dial to indicate 1 cubic foot.
If using a gas meter with SI (metric) units:
• 1 cubic foot = 0.0283 cubic meters
• 1 cubic meter = 35.315 cubic feet
• 0.01 cubic meter = 0.3531 cubic feet
• 0.5 cubic meter = 1.766 cubic feet
1. Insert a duct thermometer in the supply air
duct. The thermometer should be placed as
close as practical to the furnace, but out of the
"line of sight" of the heat exchanger (this pre-
vents false readings owing to radiant heat). En-
sure that the thermometer location is within the
duct air stream. Avoid locations such as the in-
side radius of an elbow, etc.
TABLE 10 - AIR FLOW
MODEL 95V
A/C
Input
Tonnage
60000 3 Ton
80000 3 Ton
80000 4 Ton
100000 5 Ton
120000 5 Ton
Note: Moving the ADJUST jumper from the NORM position to the
(+) or (-) position will increase or lower the CFM by 15%
44
ESP 0.1" to 1.0" w.c.
ADJUST COOL
Jumper Jumper
A
B
NORM
C
D
A
B
NORM
C
D
A
B
NORM
C
D
A
B
NORM
C
D
A
B
NORM
C
D
3
CFM
1200
1000
800
600
1200
1000
800
600
1600
1200
1000
800
2000
1600
1200
800
2000
1600
1200
800