Carrier 42C Series Product Data page 25

SYMBOL/SKETCH
a42-4282
LEGEND
Cv — Coefficient of Velocity
DX — Direct Expansion
ETO — Engineering to Order
*Check all system component pressure ratings (coils, values, pumps,
etc.) with manufacturer and any applicable local or national piping
codes prior to specifying system pressure rating.
PIPING COMPONENTS (cont)
DESCRIPTION
BALANCE VALVE: Variable water flow man-
ual balancing valve with screwdriver slot
adjustment screw.
Application — Often used in conjunction with
test port fittings for water flow balancing. Bal-
ance by temperature differential or coil pres-
sure drop (check specifications for service
fittings required if balancing by pressure drop).
May be used in 3-way valve bypass line to per-
mit equal flow balancing.
FIXED FLOW VALVE: Flexible orifice type
(non-adjustable).
Application — Used for water flow balancing.
Valve automatically adjusts the flow to within
10% of set point.
STRAINER: Y-type body with 20 mesh stain-
less steel screen.
Application — Used for removal of small parti-
cles from system water during normal system
operation. Should not be used in lieu of main
system strainers. Strainer screen may have to
be removed during initial high pressure system
flushing during start-up. Screen should be
removed and cleaned per normal maintenance
schedule (provisions for strainer blow-down
not provided).
BALL VALVE: Manual balance and shut-off
valve.
Application — Used for unit isolation and water
flow balancing. Without memory stop feature
water balance point must be marked by
installer (if necessary). Check specifications
for service fittings required when used for
water balancing.
BALL VALVE WITH MEMORY STOP:
Manual balance and shut-off valve.
Application — Used for unit isolation and water
flow balancing. The adjustable memory stop
feature allows return to the balance point after
shut-off. Check specifications for
service fittings required when used for water
balancing.
C FACTOR RATING*
V
1 / 3 / PSI
2 4
4 14 300
Valve orifice size
determines C fac-
V
tor. The orifice of
these fixed flow
valves changes as
flow is regulated.
As the water pres-
600
sure increases, the
orifice size
decreases, thereby
automatically limit-
ing the flow rate to
the specified gpm
(±10%).
9.0 19.0
400
Clean Clean
14.2 28.6 600
14.2 28.6 600
STEAM
USE
F
250 NO
220 NO
150 N/A
350 YES
350 N/A
25