MTD 248-604A Manual de instalación descargar pdf (Pagina 21)

IM 1083 Self-Contained WSHP Unit Ventilator Models ARQ, ERQ, GRQ Page 21 of 42

Bypass valves at the heat rejector and supplementary water heater

should be adjusted for normal operation. Disconnect all power to the

heat rejector and heat pump so that they will not operate while the

system is being cleaned. The cleaning solution should then be circulated

throughout the system, with water heater controls temporarily adjusted

to raise the solution temperature to about 105°F to 110°F. DO NOT

allow the temperature to rise above 110°F, especially in systems using

plastic pipe. Alternate operation of the primary and standby pumps,

and circulate the warm solution for several hours. Then turn off the

water heater and pump, completely drain the system and rell with

fresh water. Repeat the cleaning process only if there is indication of

foreign matter still in the system, or if a test of the water indicates that

it is even slightly acid.

The water should be slightly alkaline, with a pH no higher than 8.0 and

no lower than 7.0, which is neutral. Traces of TSP or similar cleaning

agent will tend to leave the water in a slightly alkaline condition

provided all acid forming substances such as pipe coatings or ux

have been properly cleaned out. A tight system requiring little or no

make-up water, with neutral or slightly alkalline water, will remain in

proper operating condition indenitely. The addition of chromates or

other corrosion inhibitors is NOT recommended, except when ethylene

glycol is added for freeze protection. IN ALL CASES, A WATER

QUALITY EXPERT SHOULD BE RETAINED TO MAKE A

WATER ANALYSIS.

Note: Contact a local water treatment company to

conrm water clarity prior to unit operation.

Water System Cleaning

The system water piping must be thoroughly cleaned and ushed in

order to remove dirt, chips or other foreign matter before connecting

to the heat pumps or starting the system. Since the initial condition of

the system water may be such that dirt or other foreign matter may clog

or otherwise damage balancing and shutoff valves, it is recommended

that these valves be omitted during the cleaning of the water system

as outlined in the following procedure.

The entire system should be lled with clean, fresh water and properly

vented. Piping leaks should be repaired as early in this procedure as

they are discovered. With valves positioned to bypass the heat pumps,

heat rejector and the supplementary water heater, the pump should be

started to circulate water through the system. Check strainers frequently

and clean as often as needed. If the water is extremely dirty or murky,

it is sometimes helpful to continuously ush, using the system pump,

until the water being ushed out of the pipe loop has become clear. To

ush in this manner requires care to be certain that make-up water is

being added fast enough to replace what is being ushed out. This can

be accomplished by opening the make-up water bypass valve around

the automatic pressure reducer valve, adjusting the manual valve so

that the pump suction pressure gauge continues to indicate the same

positive pressure that existed before the manual drain and make-up

valves were opened. Continue for at least two (2) hours.

To complete the cleaning, ll the system with fresh water, adding a

cleaning agent such as trisodium phosphate (TSP).

Return Runout

Supply Runout

Mains

Flexible Hose

Runouts Initially

Connected Together

CAUTION

Units must be checked for water leaks upon initial water

system start-up. Water leaks may be a result of mishan-

dling 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.

CAUTION

Prior to first operation of any unit, the water circulating

system must be cleaned and flushed of all construction dirt

and debris.

If the unit is provided with water shutoff valves, either elec-

tric 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.

NOTICE

It is Daikin’s policy not to make recommendations on water

treatment. It is the responsibility of the user to check that

the water supply to the units is free of contaminants or cor-

rosive agents, chemicals or minerals. The general contrac-

tor 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.

Figure 37: Connections for ushing system piping

CAUTION

Water/refrigerant heat exchanger fouling will interrupt water

flow resulting in localized freezing.

Install a 16-20 mesh strainer in the water line upstream of

the exchanger.

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MTD 248-604A Manual de instalación Pagina 21

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