Carrier 38MGQ Installation Instructions Manual page 20

Install the Drain Pipes
S Keep piping as short as possible and slope it downwards
at a gradient of at least 1/100 so that air may not remain
trapped inside the pipe.
S Keep pipe size equal to or greater than that of the
connecting pipe (PVC pipe, nominal diameter 0.79 in.
(20mm)) /, outside diameter 0.98 in. (25mm).
S Push the drain hose as far as possible over the drain socket,
and tighten the metal clamp securely.
Fig. 33 --- Push the drain hose
5. Remove the paper pattern for installation (for new ceiling
only).
(1.) Drain socket (attached to the unit)
(2.) metal clamp
(3.) Drain hose
(4.) Insulation (field supply)
a. Insulate the drain hose inside the building.
b. If the drain hose cannot be sufficiently set on a slope, fit
the hose with drain raising piping (field supply).
c. Ensure the heat insulation work is executed on the
following 2 spots to prevent any possible water leakage
due to dew condensation:
(1.) Indoor drain pipe
(2.) Drain socket.
DRAINAGE HOSE
IMPORTANT: Observe all local sanitary codes when installing
condensate drains.
1. Install the drain hose.
S The drain hose diameter should be equal or bigger than the
connection pipe's. (The diameter of the polythene pipe: Outer
diameter 1 in. (25 mm) Surface thickness
S The drain hose should be short and the drooping gradient
should be less than 1/100 to prevent the formation of an air
bubble. If the drain hose does not has enough of a drooping
gradient, a drain raising pipe should be added.
S To prevent a bend in the drain hose, the distance between the
hoisting stand should is 3 to 5 ft. (1 to 1.5 m) (see Fig. 34).
Fig. 34 --- Drain Hose
NOTE: Drain Setup pipe
INSTRUCTION
The slant gradient of the attached drain hose should be within 3 in.
(75 mm) so that the drain hole does not have to endure unnecessary
outside force.

0.06 in. (1.5 mm).
20
S Use the drain hose and clamp attached. Insert the drain hose
into the drain vent, and then tighten the clamp.
S Entwine the big sponge on the clamp of drain hose to
insulate heat.
S Heat insulation should be applied to the indoor drain hose.
Sponge(attachment)
Clamp(attachment)
Clamp
Sponge (gray) Drain hose
Fig. 35 --- Drain Hose
S The install height of the drain raising pipe should less than
21 in. (530 mm).
S The drain raising pipe should form a right angle with the
unit, and distance to unit should not beyond 11.81 in.
(300mm).
Fig. 36 --- Drain Setup Pipe
Fig. 37 --- Slant Gradient
1. Install the drain hose according to the following process if
several drain hoses join together.
Fig. 38 --- Slant Gradient
Below 1/6 in (4 mm)
Unit: in/mm