Emerson E2 User Manual - Page 10

Browse online or download pdf User Manual for Measuring Instruments Emerson E2. Emerson E2 17 pages. Clarification of the operation of alarm annunciators
Also for Emerson E2: Quick Reference Manual (2 pages), Quick Setup Manual (2 pages), Quick Start Manual (8 pages), Instruction Manual (12 pages), Quick Start Manual (14 pages), Quick Start Manual (9 pages), Quick Start Manual (14 pages), Quick Start Manual (9 pages), Installation And Operation Manual (20 pages), Technical Bulletin (8 pages)

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pressure control with E2 controllers can often provide savings of 4% or more during

periods of cooler weather, and substantial savings in general any time of the day, week,

month or year when either the fixture heat load or compressor system capacity vary for

any reason. These savings are as compared to a carefully setup and properly working

traditional EPR control-based refrigeration system, the exception rather than the rule in

the supermarket industry. Savings can be much greater when compared to real world

EPR-based systems and conditions.

E2 fixture temperature control with ESRs is very precise (within 1F), allowing the

refrigeration system to support the highest levels of food quality possible. Figure 3

shows data from an actual supermarket that demonstrates the temperature control that

can be achieved with ESRs.

Figure 3. Temperature Control with Evaporator Stepper Regulator.

The use of ESRs has a number of other benefits. With traditional mechanical

EPR valves, a service technician must be physically present at the compressor system

to make adjustments, and has to go through a laborious process that requires the

technician to connect two sets of service pressure gauges, and then adjust the EPR

valve setting by trial and error to obtain the desired evaporator and fixture temperatures.

With E2 and ESRs, anyone can change the temperature setpoint without even being

present in the store, by connecting remotely to the E2 via network or dialup connection

and simply changing setpoints in the E2 controller. A meat case that has held red meat

requiring a 32 degF fixture temperature that is then reset with smoked pork products

requiring 36 degF, can have its operating temperature adjusted easily and remotely

without the expense of a service technician visit. Returning to energy efficiency benefits,

it is important to note that the pressure drop across an ESR when it is fully open is less

than 0.5 psig, resulting in additional energy savings compared to EPRs whenever the

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