Carrier 42 SERIES Application Data page 27

SYMBOL/SKETCH
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.
DESCRIPTION
2-WAY MOTORIZED VALVE: Electric
2-position 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 secondary (unit) flushing, constant
water flow prior to start-up, etc.
Manual override is automatically
disengaged when valve is electrically
activated. 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 override 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
resistance through the valve package
(not necessarily 100% through the coil).
2-WAY PNEUMATIC VALVE:
Pneumatic operated 2-way
control valve.
Application - Specified and supplied by
others when required as part of a
factory-assembled valve package.
See Table 1 for approved listing of
pneumatic valves suitable for
installation on various unit models.
3-WAY PNEUMATIC VALVE:
Pneumatically operated 3-way
control valve.
Application - Specified and supplied
by others when required as a part of a
factory-assembled valve package.
See Table 1 for approved listing of
pneumatic valves suitable for
installation on various unit models.
AQUASTAT: Water temperature
sensing electrical switch.
Application - Clips directly on nominal
size 1 ⁄ or 3 ⁄ copper tubing for
2 4
water temperature sensing. Must be
correctly located for proper control
operation.
C FACTOR
V
⁄
1
2
2.3
5.0
SERVICE
2.8
BYPASS
SPECS VARY WITH SUPPLIER
SPECS VARY WITH SUPPLIER
27
RATING
STEAM
⁄ PSI F
3
4
2.3 300 200
5.0
300 200
2.8
USE
YES
15
PSI
MAX.
N/A