Carrier 40UV Installation, Start-Up And Service Instructions Manual page 44

B
WATER
COIL
B
WATER
COIL
2-WAY VALVE
Fig. 33 — Typical Piping for Spring Return
2-Way and 3-Way Mixing Valves
The valve type is identified by the first digit of the two-digit
control code number. In Table 18, the water valve type is
shown for each unit depending on coil capacity.
CONTROL SEQUENCE
2A/3A
2B/3B
2D/3D
2F/3F
2G/3G
2J/3J
2K/3K
2M/3M
20/30
21/31
22/32
23/33
24/34
25/35
LEGEND
DX — Direct Expansion
A
COM
RETURN
SUPPLY
3-WAY VALVE
A
RETURN
SUPPLY
Table 18 — Factory-Supplied Water Valves
APPLICATION
Chilled/Hot Water (Modulating Valve) Control
Chilled Water Cooling, Hot Water
or Steam Heating
Chilled Water Cooling, Electric Heat
Hot Water or Steam Heating Only
Hot Water or Steam Heating, DX Cooling
Chilled Water Cooling Only
Face and Bypass Chilled Water Cooling
with Valve Control Heating
Face and Bypass Chilled Water Cooling
with Valve Control Reheat
Chilled Water/Hot Water Using Face
and Bypass Damper Control
Chilled Water Cooling, Hot Water or
Steam Heating
Chilled Water Cooling, Electric Heat
Hot Water or Steam Heating, DX Cooling
Hot Water or Steam Heating Only
Chilled Water Cooling Only
NOTE: Dimensions are in inches (mm).
Fig. 34 — Water Valve Dimensions
(Modulating Type)
For pressure drops other than those tested, see Table 19. See
Tables 20 and 21 for close-off pressure.
VALVE APPLICATION
Chilled Water/
Hot Water
Chilled Water
Hot Water/Steam
Chilled Water
Hot Water/Steam
Hot Water/Steam
Chilled Water
Chilled Water
Reheat
Chilled Water
Reheat
Preheat
Chilled Water/
Hot Water
Chilled Water
Hot Water/Steam
Chilled Water
Hot Water/Steam
Hot Water/Steam
Chilled Water
44
NORMAL POSITION
Open
Closed
Open
Open
Open
Open
Open
Closed
Open
Closed
Closed
Open
Open
Closed
Open
Open
Open
Open
Open