Operator`s manual

PUREHEAT™ HYDRONIC AIR HEATER OPERATOR’S MANUAL – SECTION 3
V. 2, Rev. 09/01/06 © 2006 Ground Heaters, Inc. 3- 1
BURNER ADJUSTMENT AND SHUTDOWN
The Pureheat™ Hydronic Air Heater can be operated on natural gas (NG), liquid propane vapor (LP) or
diesel/fuel oil (OIL). (Refer to Appendix A-24 or A-25 for Burner component identification)
NOTE: All Burners on Pureheat™ are initially calibrated (adjusted) by test firing at Ground Heaters, Inc.’s
factory located 600 ft (180 m) above sea level (asl) using NG/LP or a 70/30 blend of#2 and #1 (K1)
diesel along with additives.
For NG and LP Burners:
The air and/or gas settings are returned to “zero” after factory test firing.
A CERTIFIED AND LICENSED GAS TECHNICIAN MUST RECALIBRATE THE BURNER AIR AND
FUEL SETTINGS TO OBTAIN PROPER COMBUSTION AT YOUR WORK SITE.
1. Burner setup and installation, fuel supply connection, test-firing and Burner adjustment must
be
performed
by a licensed professional and must conform to the requirements of local, state
and
federal authorities. In the Commonwealth of Massachusetts, gas piping shall be installed
by
a licensed plumber or gas fitter.
2. All gas and propane connections must be leak tested prior to placing into service.
3. The Pureheat™ must not be installed within 12 ft (3.6 m) of combustible materials.
4. All NG/LP Burners are test fired at Ground Heaters, Inc.'s factory prior to shipment.
To ensure proper Burner performance and to
avoid machine downtime due to heater sooting, Burner
combustion verification and adjustment must
be performed:
• before starting at a new job site
• before operating at elevations 1,000 ft (305 m) above or below the last adjustment
• after any Burner maintenance has been performed
• after changing fuel from NG to LP or LP to NG
• after removing oil Burner and installing gas Burner
• after removing gas Burner and installing oil Burner
• if Burner performance is in question for any reason
A Combustion Analyzer, Smoke True Spot Tester, Fuel Pressure Test Kit (oil), Low and High range
Manometers (NG/LP) and common hand tools will
be required.
3.1 NATURAL GAS/LIQUID PROPANE
3.1.1 Burner Adjustment
Before beginning these steps, it is assumed that the NG/LP Burner and gas train have been installed per
Section 4.2.2.
NOTE: The use of a high quality combustion analyzer and two manometers, one with a range of 0 to 15 in.
water column [WC] and one with a range of 0 to 30 in. WC is mandatory
. All adjustments must be
accomplished
by a licensed professional and must conform to the requirements of local, state and
federal
codes and authorities.
Use air damper settings and fuel pressure adjustments to obtain an Exhaust O
2
value of 3 to 5% and a
smoke spot value of 1 or less. Maintaining O
2
in the 3 to 5% range assures that there are no unburned
hydrocarbons remaining in the exhaust. Unburned hydrocarbons cause soot production.
If the above values cannot be obtained by adjusting the Burner air dampers alone, it may be necessary to
reduce the firing rate (lower fuel pressure). This is especially true at elevations above 3,000 ft (914 m).