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Pilot, NC, Carrier McQuay V-6040 Pilot Valve

Price: $238.67
Excl. Shipping
SKU: PIL60403
(See Product Details Below for Manufacturers Part Numbers)
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Manufacturer: Johnson Controls


Category: Pneumatic Controls

Sub Category: Switches & Relays

V-6040 Pilot Valve


· Compatible with system
terminal units; allows
Fire Management
Override Night Setback

· Adjustable set point for
sequencing applications

· Allows upgrading by adding
wall mounted room

· Used with High or Low
Volume Controllers

The V-6040 Pilot Valve is
designed for use on system
powered terminal units. It can
be used for normal temperature
control and as a failsafe device
for fire management systems.
Upgraded system powered
terminal units consist of duct air
valves, thermostat, pressure
regulator, in-line filter and the
V-6040 pilot valve. The
thermostat can be a low or high
volume room thermostat using a
standard 15 or 20 PSIG (103 or
138 kPa) supply. Duct air valves
may be the inflatable air bag
type or the dual disc cone type
operated by expandable

Air pressure that operates the
duct air valve is taken from the
supply duct through the in-line
filter and pressure regulator.
Duct pressure to the regulator
must be 1 to 6 in. WG (.25 to
1.5 kPa).


Carrier Moduline & Tempmaster Units

With the inflatable air bag in the
cold air duct fully inflated, no
cold air is introduced into the
space. The normally open
reheat valve will be open,
allowing the space to heat.
As temperature increases the
T-4002 output pressure will
increase, modulating the N.O.
reheat valve to a closed position.
At 6 PSIG (42 kPa) the reheat
valve will be fully closed, and the
V-6040 will begin to exhaust air
from the air bag in the cold duct
to allow cooled air into the
space. If the temperature
continues to rise, the T-4002 will
increase control pressure to the
V-6040, causing it to bleed
additional air from the air bag
allowing more cooled air into the
space. At 12 PSIG
(83 kPa) output from the T-4002

Johnson T-3900 Systems

When used on a Johnson
T-3900 system, the operation is
the same; however, a reverse
acting thermostat and a normally
closed reheat valve are used.

Failsafe Operation
Carrier Moduline Units

When the V-6040 Pilot Valve is
used as a failsafe device for fire
management systems, a low
pressure, system powered
thermostat is used. On
inflatable air bag systems,
20 PSIG (138 kPa) from a fire
management/smoke control
system, is applied to a normally
open V-6040 to close it. During
normal operation the duct air
valves are controlled by the
system powered thermostat. In
a failsafe condition the 20 PSIG
(138 kPa) is removed from the
V-6040 diaphragm which
exhausts all pressure from the
duct air valves allowing full air
flow in the duct to pressurize the
surrounding area and seal off
the space.

Johnson T-3900 Systems

On T-3900 systems, a normally
closed V-6040 is supplied with
20 PSIG (138 kPa) from a fire
management/smoke control
circuit and the system is
controlled by the system
thermostat. In a failsafe
condition, the 20 PSIG
(138 kPa) is removed, allowing
the V-6040 to close. The duct
air valves will open allowing full
air flow in the duct to pressurize
the surrounding area to seal off
the space.

McQuay Fluidtech
Cooling Sequence

On demand for full cooling, the
room thermostat will supply full
control signal to the V-6040's.
This will exhaust air from the
black connection of the McQuay
fluidic switch and allow the
pressure to increase in the white
connection. The fluidic switch
will then divert system air from
the plenum to atmosphere and
allow the bellows to exhaust and
open the outlet into the space.

Replaces Part Numbers: V-6040-3, CARV-6040-3

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