Step 3 - Install Condensate Drain Line And External Trap; Step 4 - Rig And Place Unit - Bryant 548F Installation, Start-Up And Service Instructions Manual

Fig. 2 — Unit Leveling Tolerances
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with appli-
cable fire codes.
A minimum clearance to combustibles is not required around
ductwork on vertical discharge units. On horizontal dis-
charge units with electric heat, a minimum clearance of
1.0 in. is required for the first 12 in. of ductwork. Cabinet
return-air static pressure should not exceed –0.35 in. wg
with Durablade economizer, –0.30 in. wg with EconoMi$er,
or –0.45 in. wg without economizer.
III. STEP 3 — INSTALL CONDENSATE DRAIN LINE AND
EXTERNAL TRAP
Condensate drain connections are located on the bottom and
side of the unit. Unit discharge connections do not determine
the use of drain connections; either drain connection can be
used with vertical or horizontal discharge units.
When using the standard side 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 installa-
tion, relocate the factory-installed plug from the bottom con-
nection to the side connection. See Fig. 3. The piping for the
condensate drain and external trap can be completed 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. If drain line is installed downstream from the
external trap, pitch the line away from the 548F unit at 1 in.
per 10 ft of run. Do not use a pipe size smaller than the unit
connection.
MAXIMUM ALLOWABLE
DIFFERENCE (in.)
A-B B-C A-C
0.5 1.0 1.0
IV. STEP 4 — RIG AND PLACE UNIT
Inspect unit for transportation damage, and 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, and rollers may be used to move unit across a roof.
Level by using unit frame as a reference. See Table 1 and
Fig. 4 for additional information. Operating weight is shown
in Table 1 and Fig. 4.
Lifting holes are provided in base rails as shown in Fig. 4
and 5. Refer to rigging instructions on unit.
        
CAUTION:
    
A. Positioning
Maintain clearance around and above unit to provide proper
airflow and service access. See Fig. 5.
A properly positioned unit will have the following clearances:
1
/ -in. clearance between roof curb and base rails on each
4
side and front of unit;
rear of unit. (See Fig. 1, section C-C.)
Do not install unit in an indoor location. Do not locate unit
air inlets 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 top crating.
NOTE: Drain plug is shown in factory-installed position.
Fig. 3 — Condensate Drain Connection (Side View)
— 3 —
1
/ -in. clearance between roof curb and
4
DRAIN PLUG