12
Operation
I. START UP
A.
Make sure service switch to boiler is off.
B.
Make sure boiler has been filled with water until entire system has been purged and desired pressure
obtained.
C.
Make sure all manual shut off valves in the gas line are open.
D.
Set operating controls at 180°F.
E.
Check to make sure that limit switch is set at 205°F.
F.
Check burner settings as shown in Table 1. Adjust as required.
G.
Bleed off any air in the gas line by attaching a 1/4 NPT nipple and stop-cock to the inlet side of the
Honeywell VR8205A 2008 gas valve. Once a faint smell of gas is noticeable at the fitting, immediately
shut off the valve. Allow the gas to disipate for a period of 5 minutes prior to proceeding to the next step.
H.
Apply 120 vac power to the aquastat control. Set thermostat above room temperature to call for heat.
The control will perform a self check routine which consists of full flame sensing. Since the system calls
for heat (step D), the burner will proceed with a 34 second prepurge and then attempt to fire. The burner
will attempt to fire 3 times before going into lockout.
)
II. START UP ADJUSTMENTS
A.
Equipment Required
1. CO/CO2 Analyzer
2. Draft Regulator
3. Manometer (Reads in W.C.)
4. Stack Thermometer
B
. Adjustment to Gas Pressure Regulator
The manifold pressure should be set to:
120 140 160
Nat. Gas LP Nat. Gas LP Nat. Gas LP
3.5" 2.3" 3.5" 2.3" 3.5" 2.3"
To adjust gas pressure, turn the adjusting screw of the gas pressure regulator out (counterclockwise) to
decrease the pressure. Turn in (clockwise) to increase the pressure. Refer to control specification sheet
supplied with the boiler for location of the gas pressure regulator. The final manifold pressure should not be
more than plus or minus 0.2" water column from the specified pressure. Major changes to the gas flow
should be made by changing the drill size of the burner orifice.
C.
Adjustments to the Burner
Allow the burner to operate for at least 15 minutes and then make the following adjustments:
(1) Sampling Hole - Punch a 1/4” hole in the flue pipe between the flue box and the draft regulator. Test
readings should be taken at this point or inspection port. (See page 13)
(2) Draft - Take a draft reading from the inspection port above the burner, directly in the combustion cham-
ber. This reading
must
be taken
DURING
combustion. This “Over-the-Fire” reading must be
POSITIVE
pressure. (Refer to Table 1)
(3) Combustion Set-up - Air Band and Head settings shown in the table are approximate. The Burner
MUST
be set-up and adjusted during actual field installed conditions.
