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B. Blower high speed (15 sec. time delay) -
Vacuum pressure should be 1.91" W.C. to
1.98" W.C.
C. If vacuum pressure reading is outside of the
values stated above, check blower air inlet
for debris buildup/obstructions. If found, turn
power switch off. Remove debris and retest.
D. If vacuum pressure results are the same
after retest, replace blower. Perform GAS
VALVE/BLOWER INLET PRESSURE
CHECK.
GAS VALVE/BLOWER INLET
PRESSURE CHECK
Shut off the gas before servicing the
unit.
Fig. 40
1. Remove CORNER & REAR PANELS
(TILTING) or SIDE & REAR PANELS
(STATIONARY) to access blower & gas valve.
2. Open inlet pressure port. Turn screw 1 to 2 turns
CCW.
3. Attach slack tube manometer hose to inlet
pressure port.
4. Open manifold pressure port. Turn screw 1 to 2
turns CCW.
5. Attach U inclined manometer hose to manifold
pressure port.
6. Reconnect power and turn gas supply on.
NOTE: If static line pressure exceeds 14" W.C. (½
psig) the customer must supply and install a line
pressure regulator to reduce the pressure below the
maximum allowable for the valve.
7. Turn Kettle on.
8. Verify inlet pressure is 5-7" W.C. (natural) and
11-13" W.C. (propane).
9. Measure vacuum pressure.
A. Blower low speed (during trial for ignition, 7
sec) - Vacuum pressure reading should be
0.27" W.C. to 0.30" W.C. (natural or
propane).
B. Blower high speed (15 sec. time delay) -
Vacuum pressure should be 1.91" W.C. to
1.98" W.C. (natural or propane).
C. If vacuum pressure reading is outside of the
values stated above then manifold pressure
adjustment is required.
To Adjust:
1. Turn S2 gas pressure fine adjustment screw 1/4
turn (CW to increase; CCW to decrease).
2. Turn power switch off then back on and check
pressure readings. Repeat adjustment as
required.
A. If unable to achieve correct pressure, then
replace GAS VALVE. Preset S2 - gas
pressure fine adjustment screw on the
replacement valve. Turn screw fully
clockwise until it stops.
Natural - Turn screw 15 turns
counterclockwise.
Propane - Turn screw 9 turns
counterclockwise.
B. Perform GAS VALVE/BLOWER INLET
PRESSURE CHECK.
Fig. 41
K Series Gas Kettles 2/3 Jacketed Stationary and Tilting - SERVICE PROCEDURES AND ADJUSTMENTS
Page 23 of 44 F45461 Rev. A (0713)