Emerson Copeland Scroll Series, Руководство пользователя

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© 2017 Emerson Climate Technologies, Inc.
4
AE5-1377 R3
1. Introduction
Copeland Scroll™ Outdoor Refrigeration Units provide
the many benefits of scroll compressor technology,
coupled with advanced diagnostic controls, to ensure
reliable performance and operation in foodservice
applications. Electronics are used extensively in its
protection and diagnostic features. These features are
controlled by an electronic integrated control board. The
control board provides base control functions related to
temperature controller, defrost, evaporator fan control,
compressor protection e.g. current overload, phase
reversal, liquid/ vapor injection control, self diagnostics
and warnings. These error codes can be seen by an
LED display for easy and rapid troubleshooting and
maintenance.
A complete product offering for medium and low
temperature units is being offered in single and three
phase 208/230 volts. The -002 and -012 BOM product
is approved for operation in ambients from 120°F to -
10°F.
XJAM/XJAL -022 models come factory equipped with a
heated and insulated receiver (thermostat controlled), a
check valve installed between the condenser outlet and
receiver inlet, and a 6 second low pressure control time
delay function.
XJAM/XJAL -022 models are approved to operate in
ambient temperatures below -10°F (-24°C). Laboratory
testing has confirmed successful operation at -30°F (-
34°C) with the factory supplied low ambient
components. At low ambient conditions, a unit may
recycle on low pressure several times during a restart.
This is normal behavior.
2. Nomenclature/Features
See Figure 1 at the end of this bulletin.
3. Understanding Actual vs. Standard Airflow
To choose the proper coil for your application, the
density of the incoming air needs to be known to
calculate the actual capacity and performance of the
system.
A c
oil’s required capacity can be calculated using the
thermodynamic equation
Q = M x Delta hr
Q = Heat transfer to or from the air (Btuh)
M = Mass flow rate of air (lb/hr)
Delta h ] Difference between the entering and leaving air
enthalpy or total heat (Btu/lb)
The mass flow rate is equal to the density of air times
the face area of the coil times the velocity of the air at
the coil or face velocity.
M = P x A x V
P = Density (lb/cubic ft.)
A =Face area of coil (square ft.)~Fin height x fin length
V = Air Velocity (ft./min.)
For temperature conversions
(𝑨𝟏) =
𝟓𝟑𝟎
𝑻+𝟒𝟔𝟎
Table 1 - Temperature Conversion Factors
Temp (°F)
Factor A1
Temp (°F)
Factor A1
0
1.15
60
1.02
10
1.13
70
1.00
20
1.10
80
.98
30
1.08
90
.96
40
1.06
100
.95
50
1.04
110
.93
Table 2 - Altitude Conversion Factors (A2)
Alt (ft.)
Factor A2
Alt (ft.)
Factor A2
0
1.00
3000
.895
500
.982
4000
.864
1000
.965
5000
.832
1500
.947
6000
.802
2000
.930
7000
.771
2500
.912
8000
.743
SCFM= CFM X A1 X A2
Note: all calculations and ratings are based on standard
air at 70°F dry bulb temp and 29.92 Hg atmospheric
pressure (sea level). These tables convert non standard
cfm to standard cfm.
4. Performance Data
See Table 3 and Table 4 at the end of this bulletin.
5. Electrical / Physical Data
See Table 5.
6. Generator Requirements
In situations or locations were an electrical power
generator could be applied in the event of a power
outage, the Copeland Scroll™ outdoor condensing unit
will operate providing the generator will provide a supply