Reznor, PVE, Installation Manual EN 2019-11, D301113 iss D Page 31
Figure 22a : Huba air pressure switch
Figure 23b : Kromshrode air pressure switch
Operating gas valve
The main operating quick opening gas valve
is powered through the burner controller and
safety controls. The main control valve is of the
diaphragm type providing regulated gas flow
and is pre-set at the factory. The gas valve
requires no field maintenance except careful
removal of external dirt accumulation and
checking of wiring connections.
The operating valve is the prime
safety shut-off. All gas supply
lines must be free of dirt or scale
before connecting to the unit to ensure
correct sealing.
Limit controls
All units are equipped with temperature
activated limit controls. The controls are
factory set and non-adjustable. If the set-point
is reached, the limit control will interrupt the
electric power to the gas valve. These safety
devices provide protection in the case of motor
failure or lack of airflow due to restrictions.
If a limit control needs replacing, use only the
factory authorized replacement part for the
size of heater.
Never bypass the limit controls,
hazardous conditions could
result.
Figure 24 : LC3
Flue & combustion air piping
• Check the complete system annually at the
bare minimum. Inspection should include
all joints, seams, concentric adapters and
the flue terminal cap. Replace any defective
or heavily corroded parts.
Flue System
• Check that the flue is in good condition,
that it is adequately supported, that there
are no blockages or restrictions.
• Check that any joints are properly sealed
preventing an escape of products of
combustion.
• Check condensate drain if fitted .
• Check for signs of water ingress and any
resultant damage.
Flue Venter
• Check that the flue fan is clean and free
from any dust deposits
