McQuay MHW Geothermal Ran Manual de instalación descargar pdf (Pagina 12)

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Cleaning & Flushing Water System

CAUTION

Prior to rst operation of any unit, the water circulating system

must be cleaned and ushed of all construction dirt and debris.

If the unit is provided with water shutoff valves, either electric

or pressure operated, the supply and return run outs must be

connected together at each unit location. This will prevent the

introduction of dirt into the water circulating system. Additionally,

pressure operated valves only open when the compressor is

operating.

1. Priortorstoperationofanyunit,thewatercirculating

systemmustbecleanedandushedofallconstructiondirt

anddebris.

If the units are equipped with water shutoff valves, either

electric or pressure operated, the supply and return run

outsmustbeconnectedtogetherateachunitlocation.

This will prevent the introduction of dirt into the unit. See

Figure 9.

Figure 9: Connections for flushing system piping

Return Runout

Supply Runout

Mains

Flexible Hose

Runouts Initially

Connected Together

2. Fillthesystematthecitywatermakeupconnectionwith

allairventsopen.Afterlling,closeallairvents.

The contractor should start main circulator with the

pressurereducingvalveopen.Checkventsinsequenceto

bleedoffanytrappedair,ensuringcirculationthroughall

components of the system.

 Powertotheheatrejectorunitshouldbeoff,andthe

supplementary heat control set at 80°F (27°C).

 Whilecirculatingwater,thecontractorshouldcheckand

repairanyleaksintheunitandsurroundingpiping.Drains

atthelowestpoint(s)inthesystemshouldbeopenedfor

initialushandblow-down,makingsurecitywaterll

valvesaresettomakeupwateratthesamerate.Check

thepressuregaugeatpumpsuctionandmanuallyadjust

themakeuptoholdthesamepositivesteadypressureboth

beforeandafteropeningthedrainvalves.Flushshould

continue for at least two hours or longer until the drain

water is clean and clear.

3. Shut off supplemental heater and circulator pump and

open all drains and vents to completely drain down

the system. Short circuited supply and return run outs

shouldnowbeconnectedtotheunitsupplyandreturn

connections.Donotusesealersattheswivelare

connections of hoses.

4. Flush system with water for 2 hours or longer until water

is clean.

5. Rellthesystemwithcleanwater.Testthewaterusing

litmus paper for acidity, and treat as required to leave

thewaterslightlyalkaline(pH7.5to8.5).Thespecied

percentageofantifreezemayalsobeaddedatthistime.

UsecommercialgradeantifreezedesignedforHVAC

systemsonly.Donotuseautomotivegradeantifreeze(See

Table2onpage11forAntifreezeCorrectionFactors).

 Oncethesystemhasbeenlledwithcleanwaterand

antifreeze(ifused),precautionsshouldbetakentoprotect

the system from dirty water conditions.

NOTICE

It is McQuay International’s policy not to make recommenda-

tions on water treatment. It is the responsibility of the user to

check that the water supply to the units is free of contaminants

or corrosive agents, chemicals or minerals. The general con-

tractor or owner should contact a local water treatment com-

pany regarding water treatment. A fouled closed loop water

system will lead to premature component failure.

Note: Contact a local water treatment company to conrm

water clarity prior to unit operation.

Dirty water will result in system wide degradation

ofperformanceandsolidsmayclogsystem-wide

valves,strainers,owregulators,etc.Additionally,the

heatexchangermaybecomecloggedwhichreduces

compressor service life or causes premature failure.

6. Set the loop water controller heat add setpoint to 70°F

(21°C)andtheheatrejectionsetpointto85°F(29°C).

Supply power to all motors and start the circulating

pumps.Afterfullowhasbeenestablishedthroughall

componentsincludingtheheatrejector(regardlessof

season) and the vented air and loop temperatures have

beenstabilized,eachoftheunitswillbereadyforcheck,

testandstart-up,airbalancing,andwaterbalancing.

CAUTION

Units must be checked for water leaks upon initial water system

start-up. Water leaks may be a result of mishandling or damage

during shipping. Failure by the installing contractor to check for

leaks upon start-up of the water system could result in property

damage.

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McQuay MHW Geothermal Ran Manual de instalación Pagina 12

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