Drain Connections - Carrier 42CA Installation, Start-Up And Service Instructions Manual

When isolation valves only are specified, they will be brazed
to the coil stub-outs.
Check job specifications for system pressure, pressure drop
limitations and flow rate prior to selecting specific compo-
nents or valve package size (
2-PIPE SYSTEM ONLY (One Valve Package) Application:
• 2 Pipe - Hydronic Heating Only
• 2 Pipe - Hydronic Cooling Only
LEGEND
Balancing Valve
Ball Valve
Circuit Setter
Gate Shut Off Valve
NOTES:
1. Continuous water flow, chilled water or hot water.
2. Not recommended for high humidity applications.
3. 2-Pipe System Only: Not recommended with unit-
mounted thermostat on vertical units.
4. The addition of any other component(s) wil require
swage fitting for field braze or optional union connection.
5. Packages factory furnished and installed.
5
6. Valves are / -in. ODS unless otherwise specified.
8
7. If an automatic flow control valve is added, it will be
located on supply line between shutoff valve and coil (or
motorized control valve, if supplied).
8. When aquastat is used for automatic changeover,
bypass is required as indicated by dashed line.
DRAIN CONNECTIONS — Install drain line in accordance
with all applicable codes. For proper moisture carry-off, the
drain piping should be sloped away from the unit at a pitch of
at least -in. per foot. Insulate the drain line to prevent sweat-
1
/
8
ing. Extend the drain line straight from the drain pan before
making any turns. The installer must provide proper support
for the drain line to prevent undue stress on the auxiliary drain
pan. When furnished, the optional
connection must be piped to some location where an indication
of drain flow restriction may be readily observed. Units fur-
nished with a tell-tale connection should be sloped very slight-
ly towards the drain outlets.
A drain trap may be required by local codes and is recom-
mended for odor control. The differential height inlet to outlet
must be at least 1-in. wg greater than the total static pressure of
the unit. The differential height of the outlet to the bottom of
the trap must not be less than the total static pressure of the
unit. See Fig. 38 (42D) and 39 (42V).
1 3
/ in., / in., etc.).
2 4
Fig. 37 — Valve Package without Motorized Control
-in. secondary or tell-tale
5
/
8
WITH HAND VALVES ONLY
(2) BALL
R
COIL
S
(2) BALL
(1) BALANCING R
COIL
S
Provide a trap of at least 2 in. near the end of the drain line
to prevent odors from entering the rooms.
CONDENSATE
PAN STUB-OUT
7/8 IN. FIELD-SUPPLIED
DRAIN EXTENSION
Fig. 38 — Typical Drain Line Details
(42D Unit Shown)
40
BALL VALVE
BALL VALVE
BALL VALVE
BALANCING
BALL VALVE
VALVE
a42-4307
2 IN. MIN
TRAP