SAMUEL JACKSON HG-1-1501, Service And Operation Manual

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PAGE 14 of 46 HG-1-1501 GAS-FIRED HEATER
© SAMUEL JACKSON, INCORPORATED 2011 ALL RIGHTS RESERVED
ERROR 101
BLOWER MOTOR OVERLOAD: This ERROR means that the overload relay for the
blower motor starter MOL is tripped. The following should be checked before continuing
operation with this error:
•
Verify setting of overload relay MOL at 4.5 amperes.
•
Verify voltage as 380VAC, 415VAC or 480VAC. Check for low voltage condition.
•
Verify free rotation of blower and motor.
•
Verify that blower speed is not faster than 2170 RPM.
* ERROR 120
RESTART NOT PERMITTED BECAUSE AIR FLOW SWITCH HAS NOT BEEN OFF IN
24 HOURS: The Air Flow Switch (AFS) must be exercised periodically to insure its
proper operation. If the burner and blower have run continuously for over 24 hours, the
burner will NOT shut down due to this ERROR, however if the burner is turned off and
an attempt is made to restart it without turning off the blower (see note below), it will not
start and will display ERROR 120. The SELECT button will NOT allow restart. The
blower must be turned off and then back on to allow the burner to start again. If the
operator is aware of the safety reasons for this air flow switch check and desires to not
turn the fan off, a passcode to bypass this ERROR is described in the footnote for this
section.
Note: For most HG-1 heater installations, the blower is an integral part of the heater
system so this ERROR will not occur unless the air flow switch (AFS) is out of
adjustment.
ALARM 121
AIR FLOW WENT OFF FOR A MOMENT: This ALARM is an indication that a choke of
the air flow is occurring. It is displayed when the Air Flow Switch goes off and comes
back on in less than 3 seconds. The Air Flow Switch (AFS) may be set too sensitive.
ERROR 122
AIR FLOW WENT OFF FOR MORE THAN 3 SECONDS: This ERROR occurs when the
air flow is interrupted for more than 3 seconds. Verify proper air flow and adjust Air
Flow Switch if necessary.
ERROR 125
GAS LOW PRESSURE: The gas pressure is constantly monitored by the gas low pressure
switch (GLPS) in the lower cabinet. This ERROR is triggered when the pressure is
below 1.5 PSI when the gas valves are open. Check for a closed gas cock or ball valve in
the gas line to the heater. For propane systems, check for malfunction of vaporizer. The
GLPS is set to 45 inches water column (about 1.5 PSI).
In rare cases, the screen on the inlet to the SSOV valve block may be clogged. Refer to
the TESTS EXPLANATION section for GAS LOW PRESSURE for a picture of the
location of this screen.
ERROR 126
GAS HIGH PRESSURE: The gas pressure is constantly monitored by the gas high
pressure switch (GHPS) in the lower cabinet. This ERROR is triggered when the