Residential Gas Hydronic Heating System
Residential Gas Hydronic Heating System
Residential Gas Hydronic Heating System
Residential Gas Hydronic Heating System
QVM 9
Series
4
4
4
4
Safety Issues
Safety Issues
Safety Issues
Safety Issues
1
. Ignition Failure
1
. Ignition Failure
1
. Ignition Failure
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 (models FR-5 only).
The error codes are discussed in the troubleshooting
section of the installation manual.
2. Flame Detection
2. Flame Detection
2. Flame Detection
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(models FR-5
only). Refer to troubleshooting guide to further
information.
3. Power Interruption
3. Power Interruption
3. Power Interruption
3. Power Interruption
When the power is restored after a power failure,
the boiler will automatically start and return to
normal operation, manual reset is not required.
4. Excessive Air Pressure
4. Excessive Air Pressure
4. Excessive Air Pressure
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 (models
FR-5 only). Refer to troubleshooting guide to further
information.
5. Explosive Re-ignition Protection
5. Explosive Re-ignition Protection
5. Explosive Re-ignition Protection
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
6. Overheat Protection
6. Overheat Protection
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 (models FR-5 only). Refer to
troubleshooting guide to further information.
7. Low Water-Level Safety
7. Low Water-Level Safety
7. Low Water-Level Safety
7. Low Water-Level Safety
The water level in the heat exchanger is
continuously
monitored to prevent the boiler from operating if
there is no water or a restricted flow of water in
the unit.
The boiler will be automatically shut down and an
error code will appear on the room thermostat
(models FR-5 only). Refer to troubleshooting
guide to further information.
8. Automatic Water Fill
8. Automatic Water Fill
8. Automatic Water Fill
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
9. Freeze Protection
9. Freeze Protection
9. Freeze Protection
During the heating season, a sensor inside the boiler
will automatically detect and initiate a safety heating
cycle to prevent internal equipment damage from
occurring should freezing temperatures exist.
Note !
Note !
Note !
Note !
- When there is no gas supply available, the
circulating pump will automatically start up to guard
the pipes from freezing.
1
0. Gas Pressure Control
1
0. Gas Pressure Control
1
0. Gas Pressure Control
1
0. Gas Pressure Control
To prevent damage from over pressure, each boiler
is protected from occasional surges in gas pressure
by a pressure regulator located in the gas valve.
11
.
11
.
11
.
11
. Short-Circuit Protection
Short-Circuit Protection
Short-Circuit Protection
Short-Circuit Protection
Any short-circuit occurring in the boiler
’
s
electrical circuit will immediately
‘
blow
’
the
internal
glass fuse(s) and automatically cut off the gas
supply.
1
2. Lightning Protection
1
2. Lightning Protection
1
2. Lightning Protection
1
2. Lightning Protection
Each boiler is specially grounded internally and
externally to protect against lightning strikes.
1
3. Carbon Monoxide Protection
1
3. Carbon Monoxide Protection
1
3. Carbon Monoxide Protection
1
3. Carbon Monoxide Protection
The boilers are designed to maintain a safe
1
:
1
air ratio and combustion rate. This function is
continuously monitored by the boiler
’
s air-ratio
control module.
1
4. Thermostat Control Failure
1
4. Thermostat Control Failure
1
4. Thermostat Control Failure
1
4. Thermostat Control Failure
Should the thermostat fail to function properly,
as a safeguard, the boiler
’
s gas supply will be
automatically be shut down.
Equipment Protection and Personal Safety
Equipment Protection and Personal Safety
Equipment Protection and Personal Safety
Equipment Protection and Personal Safety