Wing Enterprises IOMWDF-1 - Manual (Page 16)

16
L. Incorrect Space
Temperature
1. Incorrect maximum
discharge air
temperature setting
(A1044).
2. Incorrect minimum
discharge air
temperature
setting (A1044).
3. Insufficient burner
capacity.
4. Incorrect space
temperature
calibration.
1. Check to see if heater is
delivering air at maximum
discharge air setting.
2. Check to see if heater is
delivering air at minimum
discharge air setting.
3. Check to see if heater is
operating at high fire.
4. Place thermometer next
to T244 or TS244. Compare
space temperature reading
with T244 or TD244 dial
setting.
1. If desired temperature is
not reached, increase
maximum discharge air
temperature setting.
2. If desired space temperature
is not reached, decrease
minimum discharge air
temperature setting.
3. If desired space temperature
is not reached with heater at
high fire, it may be undersized.
4. Consult factory. If tempera-
ture reading is incorrect,
check items L1, L2 & L3, then
recalibrate if necessary.
Control circuits external to Series 44 can cause burner malfunction. Always check manual valve to be
certain gas is on, and check limit controls for normal operation.
Honeywell Two Stage Valve
Two-stage models require that you check and adjust both
high and low pressure regulator settings.Two-stage appli-
ance operating sequences vary. Consult the appliance man-
ufacturer instructions for the specific operating sequence
and regulator adjustment procedure for the appliance in
which the control is installed.
1. Set appliance to operate on high.
2. Carefully check the main burner lightoff. Make sure that
the main burner lights smoothly and that all ports
remain lit.
3. Check the full rate (high) manifold pressure listed on
the appliance nameplate for high pressure.The gas con-
trol full rate outlet pressure should match this rating.
4. With main burner operating, check the gas control flow
rate using the meter clocking method or check pres-
sure using a manometer connected to the outlet pres-
sure tap on the gas control.
5. If necessary, adjust the high pressure regulator to match
the appliance rating.
a. Remove the pressure regulator adjustment cap.
b. Using a screwdriver, turn the inner adjustment screw
for HI pressure clockwise to increase or
counterclockwise to decrease the gas pres-
sure to the burner.
6. After high pressure has been checked, check low pres-
sure regulation.Two-stage appliance operating
sequences vary. Consult the appliance manufacturers
instructions for the specific operating sequence and reg-
ulator adjustment procedure for the appliance in which
the control is installed and for instructions on how to
prevent the control from moving to high stage while
checking the low pressure regulator setting.
7. Check the low rate manifold pressure listed on the
appliance nameplate. Gas control low rate outlet pres-
sure should match this rating.
8. With main burner operating, check the gas control flow
rate as before (using the meter clocking method or
check pressure using a manometer connected to the
outlet pressure tap on the control).
9. If necessary, adjust the low pressure regulator to match
the appliance rating.
a. Remove the pressure regulator adjustment cap.
b. Using a screwdriver, turn the inner adjustment screw
for LO pressure clockwise to increase or
counterclockwise to decrease the gas pres-
sure to the burner.
10.Once high and low pressure have been checked and
adjusted, replace pressure regulator adjustment cap. If
the desired outlet pressure or flow rate can not be
achieved by adjusting the gas control, check the
control inlet pressure using a manometer at the inlet
pressure tap of the control. Take the necessary steps to
provide proper gas pressure to the control.
Check Safety Shutdown Performance
NOTE: Read steps 1 through 7 before starting, and
compare to the safety shutdown or safety lockout
tests recommended for the intermittent pilot (IP)
ignition module.Where diffferent, use the proce-
dure recommended for the module.
WARNING: Fire or explosion hazard. Can cause
property damage, severe injury or death. Perform
the safety shutdown test any time work is done
on a gas system.
TROUBLESHOOTING GUIDE
Series 44 Room Temperature Control continued Reproduced with permission from Maxitrol® Company