Emerson ENV20G, ENV10G, 1.5 TO 10 TONS User Manual

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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 SYSTEM COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

4.0 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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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Introduction

1.0INTRODUCTION

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 dou- ble-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

 

 

 

 

 

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).

1

Sequence of Operation

2.0SEQUENCE 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

 

 

 

 

 

 

 

 

 

Delay (seconds)

Condition

Default

 

 

Minimum

Maximum

 

 

 

 

Loss of Flow

10

0

90

 

 

 

 

High Water Temp.

180

0

480

 

 

 

 

 

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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