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Small metal box with conduit fitting and screw terminals, zinc plated steel housing, 6.500 length, 1.6 weight

Tjernlund Products, Inc.

Tjernlund Products, Inc. PS1505 Flue Exhaust Proving Switch 6.500

SKU CH-Q0V7-YP56F

A flue exhaust proving switch rated 15 A non-inductive to 277 V AC with a 0.02 in wc maximum differential pressure setting

  • Product typeFlue Exhaust Proving
  • Overall length6.5
  • Product weight1.6
  • Reliable flue exhaust proving with 6.500 length specification
  • Handles 15 A non-inductive load up to 277V AC
  • 125 VA pilot duty rating at 24V AC for safe operation
  • Operates up to 190°F maximum temperature in industrial HVAC
  • Compact 1.6 weight with steel zinc-plated conduit box housing

Tjernlund PS1505 Flue Exhaust Proving Switch

The Tjernlund PS1505 is a flue exhaust proving switch designed for industrial and commercial HVAC applications. It uses air pressure sensing to confirm proper venting operation before allowing equipment to run. The unit features a steel conduit box housing with a zinc-plated finish for durability in demanding environments. It is built to meet specific safety requirements for combustion air verification.

SPST contact with screw terminals for control

The switch provides a single-pole single-throw contact form with screw terminal connections for straightforward wiring. Electrical ratings include 125 VA pilot duty at 24V AC and 15 A non-inductive up to 277V AC, plus 300 VA pilot duty from 115 to 277V AC. These ratings support direct control of gas valves, ignition modules or fan relays without additional contactors. The maximum differential pressure setting is 0.02 in wc for sensitive proving.

Conduit box housing simplifies mounting and wiring

The integrated conduit box enclosure allows surface mounting and protects internal connections from damage. Installers run conduit directly into the housing, reducing exposed wiring and meeting typical code requirements. The switch operates on 115V AC input with a maximum operating temperature of 190 degrees F and a maximum pressure rating of 0.5 psi. Careful tubing routing to the sensing port avoids kinks that cause false trips.

How it compares

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Price $71.99
Pricier than about 66% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameTjernlund
Model namePS1505
Product typeFlue Exhaust Proving

Questions about this item

How often should the screw terminals on this PS1505 switch be inspected or retightened?

Inspect the screw terminals during routine HVAC maintenance cycles; retighten if vibration has loosened them, as the steel conduit box and zinc-plated finish resist corrosion but do not eliminate mechanical creep.

What pressure limit stops the switch from proving airflow during extended high-demand operation?

The maximum differential pressure setting is .02 in wc; sustained pressure above this value will prevent the switch from closing its SPST contacts.

How much heat does the switch add inside the conduit box when it runs continuously at 115 V AC?

The switch is rated for a maximum operating temperature of 190 °F and draws pilot-duty power at 125 VA @ 24 V AC or 300 VA @ 115–277 V AC, so self-heating is minimal within that envelope.

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