7
© 2015 Emerson Climate Technologies, Inc.
AE4-1387 R7
compressor operating envelope.
The Headmaster Control Valve has a dual pressure
setting feature which allows a choice between two
fixed settings; The DS element has an internal
spring which is set to maintain the lower setting.
The element is then charged with air to obtain the
higher setting (180 psig) and the capillary tube is
pinched and fused. If the capillary tube is left intact,
the valve will maintain a 180 psig setting. If the
capillary tube is clipped and fused again, the valve
will maintain a 100 psig setting.
It is important to fuse the capillary tube tip after
clipping to prevent moisture from entering the
element.
Tubing Considerations – Proper tube design must be
taken into consideration when designing the tubing
connecting the scroll to the remaining system. The
tubing should provide enough “flexibility” to allow normal
starting and stopping of the compressor without exerting
excessive stress on the tube joints. In addition, it is
desirable to design tubing with a natural frequency away
from the normal running frequency of the compressor.
Failure to do this can result in tube resonance and
unacceptable tubing life.
Figure 3
shows examples of
acceptable tubing configurations.
CAUTION
These examples are intended only as guidelines to
depict the need for flexibility in tube designs. In order to
properly determine if a design is appropriate for a given
application, samples should be tested and evaluated for
stress under various conditions of use including voltage,
frequency, and load fluctuations, and shipping vibration.
The guidelines above may be helpful; however, testing
should be performed for each system designed.
Rack Applications
ZS**KAE Compressors are not approved for rack or
parallel applications because the compressors do not
have sight glasses and cannot be equipped with oil
equalization devices.
ASSEMBLY LINE PROCEDURES
Unbrazing System Components
CAUTION
If the refrigerant charge is removed from a scroll unit
by bleeding the high side only, it is sometimes possible
for the scrolls to seal, preventing pressure equalization
1105
for proper system evacuation procedures.
ZS**KAE COMPRESSORS IN COPELAND
™
CONDENSING UNITS
The new FFAP Copeland condensing units will offer the
latest technology utilizing the efficient ZS**KAE scroll
product along with incorporating the Emerson Electronic
Unit Controller (EUC) on all models.
In
Table 7
are the approved refrigerants along with the
minimum operating temperature ranges based on the
refrigerants applied.
Performance data along with the applicable
nomenclature information can be found on the www.
emersonclimate website.
Features
All condensing units come equipped from the factory
with the Electronic Unit Controller. The controller has
a minimum low pressure cutout setting of 0 psig. See
Table 5
for the recommended pressure control settings
based on refrigerant.
Condensing Unit Mounting
For 1.3 - 4.5 H.P. refrigeration scroll condensing unit
applications, soft mounts are recommended. See
Figures 2A
and
2B
.
Bump Start Protection
The bump start function has been enabled in the EUC
so whenever power is applied or re-applied to the unit
the system will energize the compressor for 2 seconds
on and 5 seconds off. This will occur for 3 cycles, and
then continuous power will be supplied to the system
for normal operation.
Brief Power Interruptions
As part of the EUC control, a two minute time delay has
been programmed into the controller on all condensing
units which will sense a brief power interruption and
lock the compressor / unit out of operation for two
minutes.
Headmaster Refrigerant Selection Instructions
Incorporated into the
SINGLE FAN FFAP
condensing
unit is a dual pressure setting headmaster which will
allow for the unit to operate in low ambient conditions
with the approved refrigerants outlined in
Table 1
.
Please follow the instructions provided below after
the refrigerant selection is made, failure to do so will
cause the system to operate outside of its approved
