!"#$%&'#()*+',+%&#-.,/%0#1%2%*&%#345# 6478#

!"#9/%*&#:;)#"*<;)#=>.,?@%A'#BC?%&#

It should be noted that this cost savings calculation does not account for an electric peak demand reduction. If the facility has a peak demand charge, and the chiller operates everyday with on operational schedule that is coincident with the facilities peak demand, then this estimate slightly underestimates the cost savings.

Condenser Temperature Reset Energy Savings and Economics Example

Example Synopsis: A water cooled centrifugal chiller currently has an entering condenser temperature of 55°F. After inspection it was determined that the temperature controls can allow modulation down to 52°F during low load periods. The operators estimate that the chiller can operate at 52°F for 3,000 hrs per year, and the chiller has an electrical load of 300 kW when operating at these low load conditions. The average electric rate is $0.10/kWh.

The annual energy savings can be estimated as:

The annual cost savings can be estimated as:

!"! !#$%&'(()*$+,-)*./0)$1)0-$2*,3-'3)0$

The predominant impact chillers have on water use relates to proper function. An inef#cient chiller will require longer hours of operation to satisfy the load. It is these additional hours that result in greater water use though evaporation at the cooling tower and any leaks in the system. Any inef#ciency results in a less-than-optimal operation leading to increased resource use – water is one of those resources.

!"!#4$ %&'(()*0$%&)35('0-$

Description Comments Maintenance Frequency

Daily Weekly Semi-

Annually

Annually

Chiller use/sequencing Turn off/sequence unnecessary chillers X

Overall visual inspection Complete overall visual inspection to be sure all equipment is operating and safety systems are in place

X

Check setpoints Check all setpoints for proper setting and function

X

Evaporator and condenser Assess evaporator and condenser coil fouling as required

X

Compressor motor temperature

Check temperature per manufacturer’s speci#cations

X

647D# !"#$%&'#()*+',+%&#-.,/%0#1%2%*&%#345#

!"#9/%*&#:;)#"*<;)#=>.,?@%A'#BC?%&#

Description Comments Maintenance Frequency

Daily Weekly Semi-

Annually

Annually

Perform water quality test Check water quality for proper chemical balance

X

Leak testing Conduct leak testing on all compressor #ttings, oil pump joints and #ttings, and relief valves

X

Check all insulation Check insulation for condition and appropriateness

X

Control operation Verify proper control function including: • Hot gas bypass • Liquid injection

X

Check vane control settings

Check settings per manufacturer’s speci#cation

X

Verify motor load limit control

Check settings per manufacturer’s speci#cation

X

Verify load balance operation

Check settings per manufacturer’s speci#cation

X

Check chilled water reset settings and function

Check settings per manufacturer’s speci#cation

X

Check chiller lockout setpoint

Check settings per manufacturer’s speci#cation

X

Clean condenser tubes Clean tubes at least annually as part of shutdown procedure

X

Eddy current test condenser tubes

As required, conduct eddy current test to assess tube wall thickness

X

Clean evaporator tubes Clean tubes at least annually as part of shutdown procedure

X

Eddy current test evaporator tubes

As required, conduct eddy current test to assess tube wall thickness

X

Compressor motor and assembly

• Check all alignments to speci#cation • Check all seals, provide lubrication

where necessary

X

Compressor oil system • Conduct analysis on oil and #lter • Change as required • Check oil pump and seals • Check oil heater and thermostat • Check all strainers, valves, etc.

X

Electrical connections Check all electrical connections/ terminals for contact and tightness

X

Water %ows Assess proper water %ow in evaporator and condenser

X

Check refrigerant level and condition

Add refrigerant as required. Record amounts and address leakage issues.

X

Chiller Checklist (contd)

!"#9/%*&#:;)#"*<;)#=>.,?@%A'#BC?%&#

!"!##$$6,78()$%&'(()*$98)*,-':;$<:=$

Job Name Date

Unit Tag

Model # Time

Serial #

Full Load Design

__________degF

__________Volts

__________Hertz

__________RLA

_____PSID_____gpm

__________degF

__________degF

__________degF

_____PSID_____gpm

__________degF

__________degF

__________degF

Operating Condition

Operating Code

Last Diagnostic

LCHW Setpoint

Current Limit Setpoint

Start #

Run Hours

Volts – AB

Volts – AC

Volts – BC

Amps L1

Amps L2

Amps L3

Amps AVG

% of RLA

Oil Sump Temperature

Oil Temperature to Bearings

Oil Level

Low Oil Pressure

High Oil Pressure

Net Oil Pressure

Operating Purge Pressure

Operating Purge Oil Level

Purge Starts

Purge Run Hours

CHW PSID

CHW Temperature in

CHW Temperature out

CHW Temperature Differential

CHW Makeup Water

Evaporator Temperature

Evaporator Pressure

CW PSI Differential

CW Temperature in

CW Temperature out

CW Temperature Differential

Condenser Temperature

Condenser Pressure

Cooling Tower Makeup Water

CHW Makeup Water

Operator Initials

!"#$%&'#()*+',+%&#-.,/%0#1%2%*&%#345# 6476#