Carrier 42C Series Product Data page 19

SYMBOL/SKETCH
LEGEND
Cv — Coefficient of Velocity
DX — Direct Expansion
NOTES:
1. Motorized 2-way valves have a maximum close-off differential of 25 psi.
2. Motorized 3-way valves have a maximum close-off differential of 10 psi.
PIPING COMPONENTS (cont)
DESCRIPTION
2-WAY MOTORIZED VALVE: Electric 2-posi-
tion flow control valve (open/closed). Normally
closed body with manual override lever.
Installed in supply line to unit.
Application — All standard control and valve
packages are based upon normally closed
valves (valve electrically powered open and
closed by spring return when electric power
removed). Manual override lever allows valve
to be placed in the open position for second-
ary (unit) flushing, constant water flow prior to
start-up, etc. Manual override is automatically
disengaged when valve is electrically acti-
vated. Consult factory for normally open
valve applications.
3-WAY MOTORIZED VALVE: Electric
2-position flow control valve (closed to coil/
open to bypass or open to coil/closed to
bypass). Normally closed with manual over-
ride lever. Installed in supply line to unit.
Application — Same comments as 2-way
motorized valve except with manual override
lever engaged the valve is open to both ports
and water flow will take the path of least resis-
tance through the valve package (not neces-
sarily 100% through the coil).
MODULATING VALVE
(Non-Spring Return): Modulating valves are
designed to control the flow in the circuit by
making incremental adjustments to the flow
path within the valve.
Application — To control fluid flow in fan coil
units.
MODULATING VALVE
(Spring Return): Modulating valves are
designed to control the flow in the circuit by
making incremental adjustments to the flow
path within the valve.
Application — Same comments as non-spring
return except when powered, the actuator
moves to the desired position, at the same
time tensing the spring return system. When
power is removed for more than two minutes
the spring returns the actuator to the normal
position.
AQUASTAT: Water temperature sensing elec-
trical switch.
Application — Clips directly on nominal
1 3
size / in. or / in. copper tubing for water
2 4
temperature sensing. Must be correctly
located for proper control operation.
C FACTOR RATING
V
1 / 3 / PSI
2 4
2.3 2.3 300
5.0 5.0
SERVICE
2.8 2.8
BYPASS
300
4.0
300
4.0
300
STEAM
USE
F
YES
15
200
PSI
MAX.
200 N/A
N/A
200
N/A
200
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