Emerson ZB66KC/E, ZB50KC/E, ZB58KC/E, ZB76KC/E, ZB88KC/E Application Engineering Bulletin

Application Engineering

Application Engineering

BULLETIN

BULLETIN

AE-1318 R1

AE4-1318 R1 June

APPLICATION GUIDELINES FOR ZB*KC/ZB*KCE COPELAND SCROLL

®

REFRIGERATION COMPRESSORS 7 TO 15 HP

Introduction

The Copeland Scroll
compressor product offering has expanded to include
higher horsepower models. These new models
include 7-15 Hp and produce between 50,000 Btu/H
and 114,000 Btu/H at 20/120°F using 60 Hz electrical
power. This bulletin covers the application parameters
recommended for operating these compressors
properly.

Nomenclature

The ZB*KC/ZB*KCE refrigeration scroll model number
includes two digits that indicate the amount of cooling
capacity in thousands of Btu/H at the 60 Hz ARI rating
point (20/120°F) with R404A in the third and fourth
location. (e.g. ZB92KC produces approximately 92,000
Btu/H). For actual compressor performance information
please visit Emerson Climate Technologies Online
Product Information at www.emersonclimate.com

®

ZB*KC/ZB*KCE refrigeration

ZB*KCE (excluding ZB95KCE & ZB114KCE)

Application Envelope for R404A/R507 MT

Figure 1A

Applications 7-15Hp

2008

Operating Envelope

The Copeland Scroll refrigeration models can be used
with a variety of refrigerants. Table 1 shows these
selection options.

The operating envelopes are depicted in Figures 1A,
1B, 1C, 1D, 1E and 1F.

TABLE 1

Model Refrigerant Lubricant

ZB50KC/E R22/407/R404A/507/134a MO/POE

ZB58KC/E R22/407/R404A/507/134a MO/POE

ZB66KC/E R22/407/R404A/507/134a MO/POE

ZB76KC/E R22/407/R404A/507/134a MO/POE

ZB88KC/E R22 MO/POE

ZB95KC/E R22/R404A/507/134a MO/POE

ZB114KC/E R22/R404A/507/134a MO/POE

ZB56KC/E R22/R404A/507/134a MO/POE

ZB68KC/E R22/R404A/507/134a MO/POE

ZB75KC/E R22/R404A/507/134a MO/POE

ZB92KC/E R22/R404A/507/134a MO/POE

ZB11MC/E R22/R404A/507/134a MO/POE

Figure 1B

ZB95KCE & ZB114KCE Application Envelope for

R404A/R507 MT Applications 7-15Hp

20 F SH

© 2008 Emerson Climate Technologies
Printed in the U.S.A.

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AE-1318 R1

Application Engineering

BULLETIN

Figure 1C

ZB95KCE & ZB114KCE Application Envelope for

R404A/R507 HT Applications 7-15Hp

20 F SH

Figure 1D

ZB*KC (excluding ZB95KC & ZB114KC)

Application Envelope for R22 HT Applications

7-15Hp

,

20 F Min. SH

Figure 1F

ZB*KCE Application Envelope for R134A HT

Applications 7-15Hp

260° F DLT Limit, 20° F Superheat

Evaporating Temperature

Voltage / Frequency Restrictions

Due to inadequate cooling from refrigerant fl ow through
the compressor, the following 50 Hz applications are
not approved:

ZB95KC / ZB95KCE / ZB114KC / ZB114KCE-TWD
420 V 50 Hz

Figure 1E

ZB95KC & ZB114KC Application Envelope for R22

HT Applications 7-15Hp

20 F SH

ZB95KC / ZB95KCE / ZB114KC / ZB114KCE-TW5
200-220 V 50 Hz

Compressor Lubrication

The compressors can be used with different lubricants
depending upon the refrigerant used. See Form 93-11
for a complete list of all Emerson approved lubricants.

Accumulators

Due to the inherent ability of scroll compressors to
handle liquid refrigerant in fl ooded start and defrost
cycle operation conditions, accumulators may not
be required. An accumulator is required on single
compressor systems when the charge limitations
exceed those values listed in Table 2. On systems
with defrost schemes or transient operations that
allow prolonged uncontrolled liquid return to the
compressor, an accumulator is required unless a

TABLE 2

CHARGE LIMITS

Model Family Charge Limits

ZB50, 58, 66, 76, 88, 95, 114 KC/E 16 lbs

ZB56,68,75,92KC/E & ZB11MC/E 17 lbs

© 2008 Emerson Climate Technologies
Printed in the U.S.A.

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AE-1318 R1

Application Engineering

BULLETIN

suction header of suffi cient volume to prevent liquid
migration to the compressors is used. Excessive liquid
fl oodback or repeated fl ooded starts will dilute the oil
in the compressor causing inadequate lubrication and
bearing wear. Proper system design will minimize liquid
fl oodback, thereby ensuring maximum compressor life.

If an accumulator must be used, an oil return orifi ce
size in the range of 0.040 - 0.075 inches (1 - 1.9 mm)
is recommended. A large-area protective screen no
fi ner than 30 x 30 mesh (0.6 mm openings) is required
to protect this small orifi ce from plugging with system
debris. Tests have shown that a small screen with
a fi ne mesh can easily become plugged causing oil
starvation to the compressor bearings.

Screens

The use of screens fi ner than 30 x 30 mesh (0.6 mm
openings) anywhere in the system is not recommended.
Field experience has shown that fi ner mesh screens
used to protect thermal expansion valves, capillary
tubes, or accumulators can become temporarily or
permanently plugged with normal system debris
and block the fl ow of either oil or refrigerant to the
compressor. Such blockage can result in compressor
failure.

Crankcase Heater

Crankcase heaters are required on systems when the
system charge exceeds the recommended charge
limit. See Table 2.

The listed crankcase heaters (Table 3) are intended
for use only when there is limited access. The heaters
are not equipped for use with electrical conduit. Where
applicable, electric safety codes require heater lead
protection, a crankcase heater terminal box should
be used. Recommended crankcase heater terminal
cover and box numbers are listed in Table 3A. If
there are any questions concerning the application,
contact the Emerson Climate Technologies Application
Engineering department.

Advanced Scroll Temperature Protection (ASTP)

After extensive research and trials Emerson Climate
Technologies found a way to install a Therm-O­Disc® temperature sensitive snap disc in the ZB50,
ZB58, ZB66, ZB76, ZB95, ZB88 and ZB114 scroll
compressors. This acts to protect the compressor from

TABLE 3

CRANKCASE HEATERS

Model Part No. Volts Watts Leads

ZB50, ZB58,

ZB66, ZB76
ZB88, ZB95

ZB114

Select by voltage and lead length

ZB56
ZB68
ZB75
ZB92

ZB11M

Model Number Kit Number

ZB50, ZB58, ZB66
ZB76, ZB88, ZB95, ZB114

ZB56, ZB68, ZB75
ZB92, ZB11M

Select by voltage

90

018-0067-00
018-0067-01
018-0067-02
018-0067-03

018-0077-00
018-0077-01
018-0077-02
018-0077-03
018-0077-04
018-0077-05
018-0077-06

TABLE 3A

CONDUIT READY HEATER BOX KITS

120
240
480
575

240
120
480
575
240
480
575

998-7029-00

998-7015-00

90
90
90

70
70
70
70
70
70
70

48"
48"
48"
48"

26"
26"
26"
26"
34"
34"
34"

Figure 2

© 2008 Emerson Climate Technologies
Printed in the U.S.A.

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