Emerson ENV20G, ENV10G, 1.5 TO 10 TONS User Manual
Precision Cooling
For Business-Critical Continuity
Liebert Envirosource
User Manual - 1.5 to 10 Tons, 60Hz
™
TABLE OF CONTENTS
1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
2.0 SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
3.0 S
4.0 I
YSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
NSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
5.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
FIGURES
Figure 1 General piping arrangement—Envirosource standby pump and cooling module with
Process Fluid Chiller 1-1/2 to 5 ton air cooled models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2 General piping arrangement—Envirosource standby pump and cooling module with
Process Fluid Chiller 8-10 ton air cooled models with electronic hot gas bypass . . . . . . . . . . . 6
Figure 3 Physical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4 Service clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 5 Equipment layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6 Cabinet dimensions for Envirosource ENV05G and ENV10G. . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7 Cabinet dimensions for Envirosource ENV20G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 8 Electrical schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TABLES
Table 1 Model numbers for minimum application flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2 Time delay settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table 3 Connection sizes (NPT male) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4 Electrical data, 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5 Technical data—Envirosource module, 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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1.0 INTRODUCTION
The Envirosource Module is an accessory to the Process Chiller, for use on systems that circulate
water and/or glycol solutions that require an isolated loop from the emergency water source. With the
heat exchanger providing fluid separation, the Envirosource automatically switches to the emergency
water source on a high fluid temperature alarm. Additionally, the module automatically switches to
standby pump operation (with interlock to shut down the Process Chiller pump) on a loss of flow
alarm.
The Envirosource Module is available in 208/230/460V, single-phase and three-phase, 60 Hz configurations. This module is a pre-piped and wired assembly that is encased in an almond colored, powder
coated and baked cabinet. It consists of a copper brazed stainless steel heat exchanger, stainless steel
pump, copper piping, RCM4 alarm monitor, adjustable time delay relays, high temperature thermostat, cooling solenoid valve, check valve and flow switch. It also includes a manual ball valve and double-check back-flow preventer on the city water line.
The integral RCM4 alarm monitor has a local display of normal operation, standby pump and standby
cooling, “on” LED. Terminal strips are included for two optional alarms (customer supplied dry contacts) and for common alarm output (dry contacts, NC/NO/COM).
Table 1 Model numbers for minimum application flow
Model # Range (gpm)
ENV05G-_00 0.3 - 1.1
ENV10G-_00 3.7 - 13.3
ENV20G-_00 3.7 - 13.3
Introduction
The Process Chiller is modified with a bypass line to permit water to flow around the chiller’s pump
when the standby pump in the Envirosource Module is operating. This bypass line runs from the
pump suction line to the pump discharge line and includes a ball valve and check valve (see
Figures 1 and 2).
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2.0 SEQUENCE OF OPERATION
During normal operation, cold fluid flow from the chiller passes across the flow switch, through the
heat exchanger, through the pump bypass check valve, past the supply temperature sensor and out to
the load (see Figures 1 and 2). The standby cooling solenoid valve is closed (de-energized) and the
standby pump is off.
If the flow switch senses loss of flow, a time delay is initiated to prevent nuisance switchovers. After
the delay (see Table 2 below), the alarm panel indicates “standby pump on” and the common alarm
contacts close, while the standby pump is brought on to resume flow and the chiller pump is locked
out. This mode is locked in until the reset button is pressed.
Similarly, if the thermostat senses high fluid temperature, a time delay is initiated to prevent
nuisance switchovers. After the delay (see Table 2 below), the alarm panel indicates “standby cooling
on” and the common alarm contacts close, while the solenoid valve is energized to resume cooling.
This mode is locked in until the reset button is pressed.
Table 2 Time delay settings
Condition Default
Loss of Flow 10 0 90
High Water Temp. 180 0 480
Minimum Maximum
Sequence of Operation
Delay (seconds)
Note that during normal operation, the auto/manual switches (see Figure 8) are set to “auto”. The
switch can be set to “manual” to force switchovers to standby pump and/or standby cooling for troubleshooting or maintenance.
Note that the “remote shutdown” function (see 4.0 - Installation) prevents emergency switchover
operation regardless of the status of other controls.
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