Fieldpiece HG2 - HVAC Guide System Analyzer - Manual (Page 16)

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4.2 Combustion INPUT FORM Overview
Figure 18. Combustion Test INPUT FORM.
Combustion gases should be sampled close to the exit
from the heat exchanger within an area where all gasses
would be well mixed and before dilution air enters the
venting systems i.e., draft hoods, barometric dampers, etc.
Testing within 18 inches of the breech is a typical location
for most oil-fi red equipment. If the appliance is an atmo-
spheric gas with a draft hood, the test would be taken in
the top fl ue passage prior to mixing with dilution air.
Aft er testing is complete, the hole in the fl ue/stack
must be patched with temperature silicone or a compa-
rable plug.
Fuel: Select Natural Gas, Oil #2 or Propane for the fuel
type of the system or appliance.
Type: Default: Condensing. Other selection: Non-Con-
densing. Th e presence of a condensate line indicates
a condensing unit, otherwise it is a non-condensing
unit.
O
2
: Connect the AOX2 with the switch on %O
2
and take
a sample of the combustion products in the fl ue/stack
(within 18 inches from the start of the fl ue).
Flue Temp: Connect the ATR1 temperature probe to
the AOX2. Set the AOX2 on TEMP and measure the
temperature of the combustion products in the fl ue/
stack (18 inches from the start of the fl ue).
CO: Connect the ACM3 and take a sample of the com-
bustion products in the fl ue/stack in the same location
as the O2% measurement (within 18" from the start of
the fl ue).
Primary Temp: Measure the temperature of the air
being introduced to the combustion process. Measure
the air temperature as close as possible to the entry
point of the appliance.
4.3 Combustion OUTPUT FORM Overview
Figure 19. Combustion Test OUTPUT FORM.
Press OUTPUT for the Combustion OUTPUT
FORM.
CO
2
: Th e %CO
2
in the combustion products.
Excess O
2
: Th e amount of O
2
above the minimum
theoretical amount needed for complete combus-
tion. For complete and effi
cient combustion, excess
O
2
must be adjusted to manufacturer’s specifi ca-
tions.
COAF (carbon monoxide air free): Th e amount of CO
in the combustion products taking into account the
dilution eff ect of excess O
2
.
Net Temp: Th e stack (vent) temperature minus the
primary air temperature.
Standard Eff (Effi ciency): Th e actual effi ciency of the
combustion equipment calculated by analyzing the
losses up the exhaust.
Siegert Eff (Effi ciency): Th e European standard for
combustion effi ciency.
Select the Fuel and what type of
equipment you are working on.
Can be measured automatically with
Fieldpiece accessory heads.
Customer ID is useful for record keeping.
Sections of manual with more
information about this test.
Modify combustion equipment
to bring these calculations to the
manufacturer's specifications.