Tjernlund SS1 SideShot with UC1 Universal Control (Version X.04) 8504102 Rev C 02/04 - Manual (Page 20)

IMPORTANT:
The following paragraph describes the initial draft adjustment. It may be necessary to make a slight readjustment to compensate
for various conditions: wind, vent connector resistance, negative building pressure and multiple appliances.
ASHRAE lists the average design factor for wind loads in North America at 15 MPH. Refer to the Draft Adjustment Chart on Page
17. We recommend that the 25 MPH category be used to allow for excursions beyond the 15 MPH average. It is not recom-
mended for the SideShot to be terminated on a wall that faces the direction of the prevailing winds. Backdrafts by severe winds
can interrupt heating equipment operation. If the SideShot is terminated in a direction prone to higher winds, or if higher winds are
common in your geographic area, use the 40 MPH category to determine the proper draft adjustment setting. If the draft adjust-
ment is set at the 25 MPH category and sustained winds exceeding 25 MPH are present, the Fan Proving Switch will disrupt the
burner until the wind load drops below 25 MPH. Wind loads are based on straight line winds directed against the Vent Hood.
IMPORTANT:
Before proceeding, close all windows, doors and fireplace dampers. Turn on all appliances in the structure that exhaust indoor air
such as clothes dryer, exhaust fans, range hoods, bathroom and whole house exhaust fans. Failure to perform the draft adjust-
ment procedure may cause a poor vent system installation possibly resulting in fire, carbon monoxide poisoning, explosion, per-
sonal injury or property damage.
DRAFT ADJUSTMENT PROCEDURE
1. Set the draft adjustment on SS1 Vent Hood to the appropriate setting based on the above instructions and the Draft Adjustment
Chart. Adjustment is accomplished by loosening both nuts on each side of the Vent Hood and centering both indicators to the
desired setting. Tighten the four nuts to secure the draft adjustment at desired setting.
2. Place the heating system into operation. NOTE: there will be a slight pause between venter operation and burner operation. A
Venter pre-purge of up to 35 seconds may also be selected. See “Pre / Post-Purge Settings” on page 5. If installation uses a
barometric draft control adjust it to the minimum or least draft setting. Allow heater to operate for 5 minutes.
3. PREFERRED METHOD: MUST HAVE DRAFT GAUGE AVAILABLE
Sample draft one foot after draft hood, diverter or barometric draft control using a draft gauge. If the draft reading is in excess of
-0.05” W.C. adjust SS1 Vent Hood cone in (less draft) or adjust barometric for (less draft) so that a draft reading of -0.02” to
-0.05” W.C. is obtained. Never adjust draft to a setting of less than -0.02” W.C. If the vent system is terminated on a wall
subject to prevailing winds a -0.05” W.C. draft setting is recommended.
4. If a draft gauge is not available test for spillage at the draft hood, diverter or barometric draft control using the flame from a
match, lighter or candle and determine the following:
A. The flame or smoke is being drawn into the draft hood, diverter or barometric draft control.
B. The main burner is burning properly, i.e. no floating, lifting or flash back.
C. If the heater has a two stage or modulating gas valve verify that burner operates properly at both low and high fire.
If the draft appears excessive adjust SS1 Vent Hood cone in (less draft) or adjust barometric for (less draft) repeat steps A
through C.
5. Lock down the he SS1 draft adjustment with four lock nuts on adjustment cone brackets and barometric damper adjustment knob
if a barometric is installed, (See Diagram P).
6. Turn off appliances and exhaust fans activated for draft adjustment procedure.
COMBUSTION AIR
Adequate combustion air is vital for proper combustion and for safe venting. Likewise, for proper SS1 performance, adequate
combustion air must be available to the appliance. Many installers assume adequate combustion air is present, especially in older
homes. In some cases this is a false assumption, because many older homes have been made "tight" due to weatherization. Size
the combustion air opening(s) into the appliance room as outlined NFPA 54/NFPA 211. When installing a SS1, it is not necessary
to supply any more combustion air than normally required when conventional venting. Common symptoms of inadequate combus-
tion air include: Fan Proving Switch short cycling, odor present at the end of burner cycle, outside air enters the structure through
the SS1 Vent System on SS1/Appliance off cycle.
FINAL SYSTEM OPERATION CHECK-OUT
1. Adjust thermostat or appliance controls to call for heat.
2. Verify that the SS1 operates first, prior to burner ignition.
Allow heating equipment and SS1 to operate continuously while performing steps 3-5.
3. Close all doors and windows of the building. If heating equipment is installed in utility room or closet, close the entrance door to
this room. Close fireplace dampers.
4. Turn on all appliances in the structure that exhaust indoor air during their operation, e.g. turn on clothes dryer and exhaust fans
such as range hoods, bathroom exhaust and whole house fans.
5. Allow SS1 and equipment to operate for at least 15 minutes. Tripping of the burner circuit by the Fan Prover Switch or High
Limit during the 15 minute operation indicates an unsafe operating condition. Turn fuel supply off to appliance and DO NOT
OPERATE UNTIL UNSAFE VENTING CONDITION IS INVESTIGATED BY QUALIFIED SERVICE PERSONNEL.
6. Turn thermostat or equipment controls to the "off" position. Verify that the venter operates for the post-purge time period set
after the burner stops firing. See “Pre / Post-Purge Settings” on page 5.
7. Return all windows, doors and exhaust fans to their original conditions of use.
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