Quietside QVM9 Series, Manual

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QVM 9
Series 4
1. Ignition Failure
If the ignition fails, the gas supply is automatically
cut off. An error code will appear as a flashing 2-
digit code on the room thermostat (model FR-5
only). The error codes are discussed in the
troubleshooting section of the installation manual.
2. Flame Detection
If the flame fails and/or the re-ignition attempt fails,
the gas supply is automatically cut off. An error code
will appear on the room thermostat(model FR-5 only).
Refer to troubleshooting guide to further information.
3. Power Interruption
When the power is restored after a power failure,
the water heater will automatically start and return to
normal operation, manual reset is not required.
4. Excessive Air Pressure
Occasionally an excessive gust of wind may be
forced into the flue pipe. The air-ratio control module
will detect these strong back-drafts. To prevent any
products of combustion from re-entering the building
through the open flue, the gas supply will be
automatically cut off. An error code will appear on
the room thermostat (model FR-5 only). Refer to
troubleshooting guide to further information.
5. Explosive Re-ignition Protection
Abrupt, noisy startups and backfires are prevented
by “
soft ignition”, a trademark of our air-ratio control
module.
6. Overheat Protection
Any overheating of the burners or heat exchanger
will automatically shut down the supply of gas to the
burners. An error code will appear on the room
thermostat(model FR-5 only). Refer to troubleshooting
guide to further information.
7. Low Water-Level Safety
The water level in the heat exchanger is continuously
monitored to prevent the water heater from operating if
there is no water or a restricted flow of water in the unit.
The water heater will be automatically shut down
and an error code will appear on the room thermostat
(model FR-5 only). Refer to troubleshooting guide to
further information.
8. Automatic Water Fill
Should the water level in the system fall too low, a
sensor will automatically activate the re-fill circuit.
9. Freeze Protection
During the heating season, a sensor inside the water
heater will automatically detect and initiate a safety
heating cycle to prevent internal equipment damage
from occurring should freezing temperatures exist.
Note !
－ When there is no gas supply available,
the circulation pump will automatically start up to
guard the pipes from freezing.
10. Gas Pressure Control
To prevent damage from over pressure, each water
heater is protected from occasional surges in gas
pressure by a pressure regulator located in the gas valve.
11. Short-Circuit Protection
Any short-circuit occurring in the water heater’s
electrical circuit will immediately ‘blow’ the internal
glass fuse(s) and automatically cut off the gas supply.
12. Lightning Protection
Each water heater is specially grounded internally
and externally to protect against lightning strikes.
13. Carbon Monoxide Protection
The water heater are designed to maintain a
safe 1:1 air ratio and combustion rate. This
function is continuously monitored by the water
heater’s air-ratio control module.
14. Thermostat Control Failure
Should the thermostat fail to function properly,
as a safeguard, the water heater’s gas supply
will be automatically be shut down.
Safety Issues
Equipment Protection and Personal Safety