Harsco Industrial MACH C1500GG, Инструкция по установке и эксплуатации, Страница: 43 / 61

MACH® Gas-Fired Boiler
Page 43
5.5 T
ROUBLESHOOTING
If any “Manual Reset” limit device trips,
DO NOT reset without determining and
correcting the cause. (Manual Reset Limits include: Flame safeguard, high or low gas pressure, high
temperature limit, stack temperature, low water level.)
The ENVI™ boiler control will display text based error descriptions to indicate any problems with the boiler. There are
two types of lockouts the control may experience: manual reset lockouts requiring an operator to press the reset
button, and automatic reset lockouts that will self reset when the error condition clears. A listing of errors and their
service codes is included at the end of this section.
Should the unit fail to operate, call a qualified service technician to troubleshoot the problem and implement corrective
actions.
5.5.1
The Loss of Power
In the event of a power failure, the display panel is not illuminated and the entire system is de-energized, closing all
automatic valves and halting all boiler operations. When power is restored the sequence of operation will resume at
Step 4. If any error/lockout is present when the power is lost, the control will retain that error/lockout and display the
error/lockout when the power is restored.
5.5.2
Loss of Water Level
The low water switch opens when there is insufficient water level in the boiler. Lockout LOW WATER LEVEL is
shown on the display, the burner operation is interrupted, and the boiler locks out. When the correct water level is re-
established, and the control reset button is pressed, the boiler will reset and will start the sequence at Step 4.
5.5.3
Low Gas Pressure
The low gas pressure switch opens when there is (or has been) insufficient gas pressure available for proper
operation of the boiler. If an external gas-supply shut-off valve is closed for any reason, a low gas condition will result.
Locking LOW GAS PRESSURE is shown on the display, the burner operation is interrupted, and the boiler locks out.
When proper gas pressure is restored, and the control reset button is pressed, the boiler will reset and will start the
sequence at Step 4.
5.5.4
High Gas Pressure
If LOCKING HIGH GAS PRESSURE is shown on the display of the ENVI™ control, the burner operation is
interrupted, and the boiler locks out. The high gas pressure switch opens when there is excessive manifold gas
pressure for the proper operation of the boiler. When proper gas pressure is restored, press the control reset button
and the sequence of operation will resume at Step 4.
In addition, a HIGH GAS PRESSURE error could be due to both gas valves being open. There are two LED
indicators on each gas valve that illuminate when the valves are powered. If you observe that both gas valves are
powered simultaneously, the boiler will show LOCKING HIGH GAS PRESSURE error as indicated above. If this error
is observed, call a qualified service technician for assistance.
5.5.5
High Water Temperature
When the boiler water has exceeded both the operating and high-limit temperature the high limit switch opens, and
Locking HIGH LIMIT
is shown on the display. When the water temperature falls below the high-limit temperature, the
boiler will remain locked out until the water high limit switch is manually reset and the front panel reset button is
pressed. Once reset, the control will restart the sequence of operation at Step 4.