Heat Wagon VG1000, Руководство по установке и обслуживанию

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6.
The burner
seems to cycle on and of
f more
frequently than what it should.
7.
The burner
starts, but the main fan never comes on.
• Gas manifold pressure • Dirt on main air blower or setup
of outlet air duct
• Burner sensor • Heater Control Unit (HCU) • Fan sensor • Heater Control Unit (HCU) • Blower motor relay • Current overload on blower motor • Blower motor
• Use a low pressure gauge (0-15 inches of water column) with 1/8” NPT
inlet.
Install gauge in the pressure tap port located on the output side of the gas valve. Run the heater
.
Adjust the pressure by turning the pressure adjusting
screw (located on the input side top of the gas valve) counter clockwise until the gauge reads the proper manifold pressure. Refer to pipe sizing charts in the Heat W
agon Engineering Guide. Heater requires 9-14” W
.C. inlet pressure.
• Check for dirt or ice buildup on the air inlet or blower wheel. If using duct on
the air outlet, ensure the back pressure does not exceed a static pressure of .5” W
.C.
• On the heater control unit (HCU) disconnect the wires from terminals X10 and
X1
1. Using an ohm meter
, check the resistance between the two wires for a
reading. Compare to Sensor Resistance Chart page 25. Replace sensor if reading out of range.
• If all of the above check good, replace the HCU. • On the heater control unit (HCU) disconnect the wires from terminals X12 and
X13. Using an ohm meter
, check the resistance between the two wires for a
reading. Compare to Sensor Resistance Chart page 25.
• T
urn the 3-position main switch to the fan position. If the blower runs, check the
fan sensor
. If it is good, replace the HCU.
• T
urn the 3-position main switch to the fan position. If the relay pulls in, check
for voltage between the L1 and L2 terminals.
Then check the voltage between
terminals
T1 and
T2.
The voltage should be the same. If it is less than 105
volts, replace the relay
.
• Push the reset button on the overload between terminals
A1 and
A2 on the
motor relay
. If there is no voltage, replace the overload.
• T
urn the 3-position main switch to the fan position. Check for voltage between
terminals
T1 and
T2 on the motor relay
. If the voltage checks at 120 volts,
replace the motor
.
V
G
10
0
0
T
R
OUBLESHOO
T
ING
Sympt
om
P
os
sible
C
aus
es
P
os
sible
Solut
ion
s
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