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Building Technologies CC1N7221en
HVAC Products 27.10.2005
Warning notes
To avoid injury to persons, damage to property or the environment, the following
warning notes should be observed!
Do not open,interferewith or modify the pressure switch!
•All activities (mounting,installation and service work, etc.) must be performed by
qualified staff
•Before making any wiring changes in the connection area of the switch, completely
isolate the equipment from the mains supply (all-polar disconnection)
•Ensure protection against electric shock hazard by providing adequate protection
for the connection terminals
•Each time work has been carried out (mounting, installation, service work, etc.),
checkto ensurethatwiringisinanorderly state
•Fall or shock can adversely affect the safety functions. Such unitsmust not be put
intooperation,eveniftheydo notexhibitanydamage
•Do not use the pressure switch in inflammable or explosive gas atmospheres
Engineering notes To set the required switching point, remove the cover from the pressure switch and turn
the setting knobclockwise to increase the set value,or counterclockwise todecreaseit
(see scale under«Dimensions»).Replace the coverand secureittopreventtampering.
Mounting notes
•Ensurethatthe relevantnational safetyregulationsare compliedwith
•Checkpiping connectionsandhousing of the pressure switch to ensure thatthere
are no leaks
•The pressure switch can bemounted either horizontally orvertically, but not in a
suspended position (with the scale pointing downward)
•The pressure switch can be connected via a ¼“ thread or O-ring, depending on the
type of switch (refer to «Connection via …»)
QPLx2… QPLx5…/QPHx5…
Gas pressure
test point
Mounting side
(optional)
7221z05e/1005
QPLx2… QPLx5…/QPHx5…
Fixing screws M4
O-ring
Spacers
7221z04e/0702
Gas inlets
(bottom,
optional)
Standard base
Gas pressure
test point
7221z06e/1005
Setting the
switching point
Connectionvia
¼“ (ISO) thread
Connectionvia O
ring
