Emerson SCROLL SZO44 - Manual (Page 12)

6 2006SSD-75 R4 (10/10)
Dual-Compressor Module Installation
NOTE: Required Component – High Pressure Discharge Gas Bypass Valve
In response to customer requests to eliminate redundancy, the high pressure discharge gas bypass (recycle)
valve was removed from some of the scroll modules (see table below).
There are several reasons for making this change:
• Locating the valve at the module level becomes redundant when two or more of our modules are
packaged together.
• The original intent of the valve was to provide a means for the module to operate in cases where the
discharge was 100% blocked due to a downstream event; however, packagers are ultimately responsible
for high pressure relief.
• When in use, the valve can act as an expansion valve when gas is passing through it, possibly
condensing water and or hydrocarbons which could be detrimental to our modules.
• The valve is a back pressure regulator which can maintain a steady discharge pressure, however the
majority of packages with our modules are controlled through suction gas recycle. Also, most packages
have a back pressure regulator on the discharge of our modules to control the actual discharge pressure
to a minimum of 70 PSIG.
• The presence of the valve was thought to protect the end user in case the discharge of our module is
isolated from the skid-level pressure relief valve and the other safeties on our module (high pressure
switch, drive current limit) are disabled or modified. However, inspectors do not consider our gas bypass
valve to be a high pressure safety device. It is the packager’s responsibility to provide adequate high
pressure safety relief/shutdown.
Packagers will need to install downstream pressure relief of our module.
2.3 Ambient Temperature Range
The Compressor Module operating ambient temperature is 20°F to +122°F (-29° to +50°C). For details on
ambient temperatures for VFD startup and Compressor Module operation, see Table 7 on page 27.
Model
Max
Delivery
Pressure
PSIG
(barg)
Max
Flow
MCFD
(MCMD)
Drive
HP
High
Press
Switch
Setting
PSIG
(barg)
Low
Press
Switch
Setting
High Temp
Setting
°F (°C)
Oil
Thermal
Bypass
Valve
Setpoint
°F (°C)
Gas Bypass
Valve
Module
Weight
Lbs.
(kg)
Dual Scroll Units
SZO56C1A-EDE-110
150
(10.3)
260
(7.36)
30
215
(14.8)
0.75 PSIG
(52 mbarg)
240
(116)
200
(93)
NO
600
(272)
SZO44C1A-EDE-140
190
(13.1)
200
(5.7)
30
215
(14.8)
0.75 PSIG
(52 mbarg)
240
(116)
200
(93)
NO
600
(272)
SZO44C1A-EDE-244
190
(13.1)
200
(5.7)
30
215
(14.8)
0.75 PSIG
(52 mbarg)
240
(116)
200
(93)
YES
625
(283)
SZV44C1A-EDE-140
190
(13.1)
200
(5.7)
30
215
(14.8)
0.75 PSIG
(52 mbarg)
280
(138)
250
(121)
NO
625
(283)
SZV32C1A-EDE-150
275
(19.0)
150
(4.2)
30
290
(20.0)
0.75 PSIG
(52 mbarg)
280
(138)
250
(121)
NO
600
(272)