Bryant SERIES D 453 - Manual (Page 4)

I. LOCATING AND MOUNTING THE UNIT
The construction of Model 48-453 is such that the unit
can be mounted on any NONCOMBUSTIBLE base.
However, there are several conditions, or circum­
stances, that result in the requirement of field supplied
supports. Some of these circumstances are:
1. When state and/or local building codes prohibit
mounting the unit directly on a base.
2. When the unit is to be placed in an area where there
is danger of standing water.
Mounting Base
The unit is supported on 3 rails attached to the bottom
of the base. These rails extend the full length of the
unit as shown in the dimensional drawing on page 2.
The recommended types of mounting bases for all
installations are:
a. Precast concrete lintels.
Use three lintels run the depth of the unit; one each
under the right and left end and one at the center of
the unit.
b. Concrete blocks.
Use a block under each corner plus a block under each
of the two long sides midway between the corner
blocks. Arrange the blocks so that the center rail as
well as the front and back rail is supported.
c. Concrete slab.
Minimum thickness 4 inches.
CAUTION: ALWAYS USE NONCOMBUSTIBLE
MATERIAL FOR THE BASE.
Rooftop Installations
1; Place the unit above a load-bearing wall whenever
possible.
2. Roof areas are susceptible to standing water; there­
fore, field-supplied supports should be placed under
the unit. Allow a minimum of 6 inches clearance
between bottom of unit and roof.
Clearances
The condenser coil is located at the back of the unit
with the condenser air inlet through the rear of the unit
and the discharge through the louvered top panel.
The minimum clearance between the back of the unit
and a wall is 15 inches. If the overhang is less than 7
feet above the unit, the unit must be mounted outside
a plumb line from the eaves of the overhang. The clear­
ance on the right and left ends should be a minimum of
2 feet to provide access for servicing. See Figure 5.
II. CONNECTING CHILLED WATER LINES
Refer to the following information: “Multiple Chillers
and Cooling Coils,” page 1; “Operation at Atmospheric Pressure,” page 1; and “Freezing Weather Protection,”
page 8.
TABLE I
Allowable Distances between Coil Model 405, 406, 407, 414 and Chiller (Note 1)
Pipe Size Bryant Quick-Connect Polyethylene Copper Galvanized
(Inches) Tubing (Note 2) Pipe Pipe Pipe
3/4" 42' 40' 45' 6Г
1" 90' 176' 189' 200'
Note 1: Values shown are for one direction only, and
using Bryant water coils. Total length of pipe (from
chiller to coil and return) would be double the values
shown. All distances shown are shown on the predica­
tion that only long elbows are used. Galvanized well
head elbows are used with the polyethylene pipe. When
using Bryant Quick-Connect Tubing, avoid any sharp
bends that would tend to restrict or stop the flow
of water.
Note 2: If Quick-Connect Tubing is used and coil is
above chiller water level, refer to PAM 400.2.6.
Simplified Guidelines When
Using Quick-Connect Tubing
1. Do not exceed 12 feet elevation with 3/4" Quick-
Connect.
2. Do not exceed 10 feet elevation with 1" Quick-
Connect.
3. Do not exceed 15 feet of horizontal tubing at those
elevations.
4. Exercise good practice to avoid kinking, sagging
and stretching.
5. Any excess lengths should be coiled up at the lowest
elevation.
6. Polyethylene or hard pipe should be used at higher
installation.
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