Carrier 50GJ006, Инструкция по установке, запуску и обслуживанию, Страница: 4 / 36

Step 2 — Field Fabricate Ductwork —
On verti-
cal discharge units, secure all ducts to roof curb and building
structure. Do not connect ductwork to unit. For horizontal
applications, field-supplied flanges should be attached to hori-
zontal discharge openings and all ductwork attached to the
flanges. Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in ac-
cordance with applicable codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with ap-
plicable fire codes.
A minimum clearance to combustibles is not required around
ductwork on vertical discharge units. On horizontal
discharge units, a minimum clearance of 1 in. is required for
the first 12 in. of ductwork. Cabinet return-air static should
not exceed −0.35 in. wg with Varislide™ or PARABLADE
economizer, or −0.45 in. wg without economizer.
Step 3 — Install Condensate Drain Line and Ex-
ternal Trap —
Condensate drain connections are located
at the bottom and end of the unit. Unit discharge connec-
tions do not determine the use of drain connections; either
drain connection can be used in vertical or horizontal ap-
plications.
When using the standard end drain connection, make sure
the plug in the alternate bottom connection is tight before
installing the unit.
To use the bottom drain connection for a roof curb
installation, relocate the factory-installed plug from the bot-
tom connection to the end connection. See Fig. 3. The pip-
ing for the condensate drain and external trap can be com-
pleted after the unit is in place.
All units must have an external trap for condensate drain-
age. Install a trap at least 4-in. deep and protect against freeze-
up. See Fig. 4. If drain line is installed down-stream from
the external trap, pitch the line away from the unit at 1 in.
per 10 ft of run. Do not use a pipe size smaller than the unit
connection.
Step 4 — Rig and Place Unit —
Inspect unit for trans-
portation damage. File any claim with transportation agency.
Keep unit upright and do not drop. Spreader bars are not
required if top crating is left on unit. Rollers may be used to
move unit across a roof. Level by using unit frame as a ref-
erence. See Table 1 and Fig. 5 for additional information.
Operating weight is shown in Table 1 and Fig. 5.
Lifting holes are provided in base rails as shown in Fig. 5,
6A, and 6B. Refer to rigging instructions on unit.
POSITIONING — Maintain clearance around and above unit
to provide proper airflow and service access. See
Fig. 6A and 6B.
Position unit on roof curb so that the following clearances
are maintained: 1 ⁄
4
-in. clearance between roof curb and base
rails on each side and in front of unit; 1 5 ⁄
32
-in. clearance be-
tween roof curb and rear of unit (see Fig. 1A and 1B, section
C-C).
Do not install unit in an indoor location. Do not locate
unit air inlet near exhaust vents or other sources of contami-
nated air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove polyethylene shipping wrap-
per and rigging skid.
50GJ006 50GT008,012
MAXIMUM ALLOWABLE DIFFERENCE (in.)
A-B B-C A-C
0.5 1.0 1.0
Fig. 2 — Unit Leveling Tolerances
Fig. 3 — Condensate Drain Location
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. trap is recommended.
Fig. 4 — External Trap Condensate Drain
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