United States Stove Company 7700, Manual

Page: 111 / 175

POLYTESTS Services
inc.
SFBA EMISSIONS AND EFFICIENCY TESTING
LABORATORY OPERATING PROCEDURE
Page
3
3. Unit is to be placed on scale for testing. Prior to proceeding with
verification process, scale should be turned on and allowed to warm up
for one (1) hour minimum. Zero scale and check calibration with standard
weights. One (1) 1 kg weight and one (1) 2 kg weight are provided for
this purpose. Use scale verification test form no. EPA-7-TP to record
results. If scale fails to reproduce weights within tolerance, check with
laboratory manager before proceeding.
4. If scale checks out, place unit on scale and align so chimney will be
centered in hood.
5. Attach chimney connector and chimney. Be sure all joints are sealed
below sampling points. Chimney and connector should be cleaned with a
wire brush. Be sure chimney connector terminates and chimney starts at
proper level above scale platform. Chimney must be supported from
scale so that it does not touch test enclosure or hood walls.
6. Thermocouples should be attached to surfaces of unit prior to testing.
EPA requires a thermocouple on the bottom of the firebox. This must be
installed prior to putting the unit on the scale. In some cases, the
required thermocouple locations will be inaccessible on finished units.
These units should have thermocouples installed by the manufacturer
during construction. Check with the laboratory manager if problems are
encountered in proper thermocouple attachment.
7. Measure firebox dimensions and record on data forms nos. EPA-2-TP.
Make a three dimensional sketch of the firebox including firebrick, baffles
and obstructions. Calculate firebox volume in cubic feet with both
addition and substraction methods using forms nos. EPA-3-TP and EPA-
4-TP. See Section 6.2.4 of EPA Method 28 for details of firebox volume
determination.
8. If unit is catalytically equipped, additional thermocouples must be installed
upstream and downstream of catalyst. Thermocouples should also be
placed in the primary and secondary combustion chambers of all units.
9. Plug thermocouples into data acquisition system jacks making a check of
locations and jack numbers for each test on data form no. EPA-5-TP.
10. Note that inserts are tested as if they are freestanding stoves.
11. Dilution tunnel should be cleaned prior to each certification test series and
at anytime a higher burn rate follows a lower test burn rate.
II.
SAMPLING SYSTEM – SET-UP
A. GAS ANALYSIS
1. Instruments should be turned on and allowed to warm up for one (1) hour
minimum.