Introduction; Nomenclature/Features; Understanding Actual Vs. Standard Airflow; Performance Data - Emerson XJAL-020Z-CFV-012 Manual

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
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 coil'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)
© 2017 Emerson Climate Technologies, Inc.
supplied low ambient
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

Table 1 - Temperature Conversion Factors

Temp (°F)
Factor A1
0
1.15
10
1.13
20
1.10
30
1.08
40
1.06
50
1.04

Table 2 - Altitude Conversion Factors (A2)

Alt (ft.)
Factor A2
0
1.00
500
.982
1000
.965
1500
.947
2000
.930
2500
.912
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
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Temp (°F)
Factor A1
60
1.02
70
1.00
80
.98
90
.96
100
.95
110
.93
Alt (ft.)
Factor A2
3000
.895
4000
.864
5000
.832
6000
.802
7000
.771
8000
.743