Bohn H-IM-68 Installation Manual

H-IM-68 March 2000 Part No. 25001301

Replaces H-IM-44

Direct Drive

Fluid Coolers

Installation and

Maintenance Data

Table of Contents

Inspection
System Warranty

Installation .........................................2

Rigging Instructions...........................3

Internal Volume and Weight ..............4

Electrical Wiring ............................ 4-6

System Installation
Piping Installation

Glycol Charge ...................................7

Mixing Glycol and Water
Glycol Sludge Prevention

Fluid Circulating Pump ..................................8

Start-up

Space and Location Requirements ..........9-10

Typical Piping

In-Warranty Return Material Procedure........11

Replacement Parts......................................12

Inspection

Responsibility should be assigned to a dependable
individual at the job site to receive material. Each shipment
should be carefully checked against the bill of lading. The
shipping receipt should not be signed until all items listed on
the bill of lading have been accounted for.

Check carefully for concealed damage. Any shortage or
damages should be reported to the delivering carrier.

System Warranty

This equipment is designed to operate properly and
produce rated capacity when installed in accordance with
accepted industry standards. Failure to meet the following
conditions may result in voiding of the system warranty:

1. System piping must be installed following industry
standards for good piping practices.

2. System must be thoroughly leak checked before initial
charging.

3. Power supply to system must meet the following
conditions:

Damaged material becomes the delivering carrier's
responsibility, and should not be returned to the manufacturer
unless prior approval is given to do so. When uncrating, care
should be taken to prevent damage. Heavy equipment should
be left on units shipping base until it has been moved to the
final location.

a. Voltage for 208/230 motors not less than

195 volts or more than 253 volts.

b. All other voltages must not exceed +/- 10%

of nameplate ratings.

c. Phase imbalance not to exceed 2%.

4. All controls and safety switch circuits properly
connected per wiring diagram.

5. Factory installed wiring must not be changed
without written factory approval.

Installation

NOTE: Installation and maintenance to be performed only by

qualified personnel who are familiar with local codes
and regulations, and experienced with this type of
equipment.

Unit Location

Units are designed for outdoor application and may be
mounted on a roof or concrete slab (ground level installation).
Roof mounted units should be installed level on steel channels
or an I-beam frame to support the unit above the roof. Use of
vibration pads or isolators is recommended. The roof must be
strong enough to support the weight of the unit. Concrete slabs
used for unit mounting should be installed level and be properly
supported to prevent settling. A one-piece concrete slab with
footings extending below the frost line is recommended.

Sound Vibration

Units should be installed away from occupied spaces and
above or outside of utility areas, corridors and auxiliary spaces
to reduce the transmission of sound and vibration to occupied
spaces. The refrigerant piping should be flexible enough to
prevent the transmission of noise and vibration from the unit
into the building. If the refrigerant lines are to be suspended
from the structure of the building, isolation hangers should be
used to prevent the transmission of vibration. Where piping
passes through a wall, it is advisable to pack fiberglass and
sealing compound around the lines to minimize vibration and
retain flexibility in the lines.

CAUTION: Sharp edges and coil surfaces are a potential

injury hazard. A void contact with them.

The dry cooler should be located far enough away from
any wall or other obstruction to provide sufficient clearance for
air entrance. Do not attach ductwork to the coil inlet or fan
outlet. Care should be taken to avoid air recirculation conditions
that can be caused by sight screening, walls, etc. Also keep
unit fan discharge away from any building air intakes. See
page 10 for space and location requirements.

The unit needs to be secured in its final location. Holes
are provided in the base runner for this purpose.

WARNING: There may be more than one source of

electrical current in this unit. Do not
service before disconnecting all power
supplies.

2

© Heatcraft Inc. 2000.

Figure 1. Rigging Instructions.

Vertical airflow type units should be located no closer
than the width of the unit from a wall or other obstruction. It
two or more units are to be positioned in the same area, a

similar distance should be maintained between adjacent units.
Sufficient free area should be left around and below unit to
avoid air restriction to coil.

3

Table 1. Fluid Cooler Internal Volume and Weight

Fluid Number Number Internal Approximate

Cooler of of Volume Net Weight

Fan Configuration Fans Rows Gallons (Lbs.)

1 x 2 2 2 6.7 1540
1 x 2 2 3 9.2 1590
1 x 2 2 4 11.8 1600
1 x 3 3 3 13.0 2360
1 x 3 3 4 16.7 2420
1 x 4 4 3 16.7 3150
1 x 4 4 4 21.7 2190
1 x 5 5 3 20.4 3510
1 x 5 5 4 26.6 3990
1 x 6 6 4 31.6 4790

2 x 2 2 2 13.5 1540
2 x 2 2 3 18.5 1620
2 x 2 2 4 23.5 1760
2 x 3 3 3 25.9 2420
2 x 3 3 4 33.4 2480
2 x 4 4 3 33.3 3230
2 x 4 4 4 43.3 3510
2 x 5 5 3 40.7 4040
2 x 5 5 4 53.1 4390
2 x 6 6 4 63.1 5270

Electrical Wiring

The electrical installation should be in accordance with
National Electrical Code, local codes and regulations. Proper
overcurrent protection should be provided for the fan motors.
Wiring diagrams shown are only basic and do not show fuses,
disconnect switches, etc., which must be provided in the field.

All standard motors have internal inherent overload
protectors. Therefore, contactors can be used instead of
starters requiring thermal protectors, eliminating the problem
of furnishing the proper heating elements.

All dry coolers or units are furnished with either single­phase or three-phase fan motors which are identified by the
unit dataplate.

4

Electrical leads from each motor terminate at the unit
junction box. Field connections must be made from these leads
through a contactor, fuse and disconnect in accordance with
local, state and national codes.

Three-phase motors must be connected to three-phase
power of voltage to agree with motor and unit dataplate.

The motors are wired into a common junction box. The
motors must be checked for proper rotation. Be sure to check
that motor voltage and control connection agree with electric
services furnished.