Bohn HWN005H6B Service Manual

Replaces BN-HSWCUTB, December 2009

WATERCOOLED CONDENSING UNITS

Technical Guide

Models HWN | Hermetic • ZWN | Scroll

BNHSWCUTB

March 2011

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TABLE OF CONTENTS

Nomenclature....................................................................................................... ................................................2

Features & Benets. ............................................................................................ ................................................3

Application Data .................................................................................................. ................................................4

Unit Specications .............................................................................................................................................. 5

Performance Data ........................................................................................................................................... 6-8

Physical and Dimensional Data ..................................................................................................................... 9

Electrical Data ............................................................................................................................................. 10-11

NOMENCLATURE

N.Y. MEA

ZW N 030 L 6 B

Compressor Application Equiv. HP Temp. Refrigerant Voltage

HW = Hermetic
ZW = Scroll

N = Indoor 005 = 1/2HP

008 = 3/4HP
010 = 1HP
01* = 1-1/2HP

H = High
L = Low
M = Medium
X = Medium/Low

2 = R-22
6 = R-404A/507

B = 208/230/1/60
C = 208/230/3/60
D = 460/3/60

02* = 2HP
03* = 3HP
04* = 4HP
05* = 5HP
060 = 6HP

2

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FEATURES & BENEFITS

Construction

• Component location and unit size are all optimized for easy eld
replacements or new installations where space is limited.

• Extra space is provided inside the electrical box for service and installation

of additional components.

• Copeland hermetic and scroll compressors for low and medium temperature
operation using R-22 and R404A.

• All units are provided with a water regulating valve for superior head
pressure control.

• An extra capacity receiver with liquid shut-o valve is provided for
installations with long refrigerant lines.

• A pumpdown switch is provided on all models for eld servicing.

Serviceability

• Easy access to the large electrical panel for service diagnostics or options.

• Color-coded wire harnesses are all labeled and coded for easy identication.

• A suction line rotolock service valve is provided on the compressor
for service.

• An additional shut o valve is mounted in the discharge line of the
compressor for quick and easy compressor to enable the service technician to
isolate the compressor for service.

• Schrader valves permit recovery of refrigerant isolated in compressor for
quick and easy compressor change if ever needed.

Quality

• Piping is laid out to minimize stress and vibration for quieter operation.

• Easy to verify leak-free unit by checking for the nitrogen holding charge
Schrader valve on the discharge or suction service valve.

• Encapsulated, automatic reset, high pressure control, and an adjustable low
pressure control with exible refrigerant hose to reduce possibility for leaks.

• A helix tube in tube water cooled condenser is standard with refrigerant
counter ow for optimum condensing unit eciency.

• Every unit is put into a vacuum and subjected to a rigorous leak test. This
results in a clean, dry and leak free unit every time.

• Electrical circuits are factory tested for functional integrity.

• Every unit is run tested and cycled on both the high and low pressure
controls.

Option

• Sight glass (optional) is easily viewable from the front to monitor the
refrigerant charge.

• Factory-installed suction lter available as option for additional system
protection.

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APPLICATION DATA

Installation Precautions

All units are factory charged with dry nitrogen which must be evacuated prior to installation.

Water valves must be adjusted during initial start-up to design condensing pressure for the selected refrigerant.

All HW “X6” models require a suction accumulator. HW “X6” models with RS compressors are not suitable for R-507.

Retrot Installations

If a P.O.E. model is used in a retrot, the old mineral oil must be completely removed from the system or at least
reduced to no more than 5% of the total oil charge. Polyolester oil is very hygroscopic. Take extra precautions to
limit exposure to the atmosphere.

Leveling Units

Unit must be level to insure proper oil return to the compressor.

Condenser Water Temperature

Maximum leaving water temperature is 105°F on all models.

Condenser Water Treatment

The use of untreated or improperly treated water may result in scaling
premature erosion or corrosion. A qualied water treatment specialist is
recommended for proper results.

Engineering Aids

Total Heat of Rejection (THR) all units:

THR = BTUH + (KW x 1000 x 3.4 x 1.0)

Water Temperature Rise (∆T

water cooled condenser:

∆T

= THR ÷ (GPM x 60 x 8.4)

w

) through

w

Hermetic

Compressor

Large

Receiver

Coaxial

Condenser

High & Low

Pressure Controls

Spacious

Control Box

Refrigerant

Isolation Service

Valves (2)

4