Aaon RQ-006 Bedienungsanleitung PDF herunterladen (Seite 53)

53

Startup

(See back of the manual for startup form.)

During startup, it is necessary to perform

routine checks on the performance of the

unit. This includes checking the air flow, air

filters, condenser water flow, dampers,

heaters, and refrigerant charge.

Filters

Do not operate the unit without filters in

place. Unit should be checked for correct

filter placement during startup. Operation of

the equipment without filters will result in a

clogged evaporator coil.

Adjusting Refrigerant Charge

Adjusting the charge of a system in the field

must be based on determination of liquid

sub-cooling and evaporator superheat. On a

system with a TXV liquid sub-cooling is

more representative of the charge than

evaporator superheat but both measurements

must be taken.

Before Charging

Unit being charged must be at or near full

load conditions before adjusting the charge.

Units equipped with hot gas reheat must be

charged with the hot gas reheat valves

closed while the unit is in cooling mode to

get the proper charge. After charging, unit

should be operated in reheat

(dehumidification) mode to check for

correct operation.

Units equipped with heat pump options

should be charged in heating mode to get the

proper charge. After charging, unit should

be operated in cooling mode to check for

correct charge. Charge may need to be

adjusted for cooling mode. If adjustments

are made in the cooling mode, heating mode

must be rerun to verify proper operation.

After adding or removing charge, the system

must be allowed to stabilize, typically 10-15

minutes, before making any other

adjustments.

Electric shock hazard. Shut off all

electrical power to the unit to avoid

shock hazard or injury from rotating

parts.

WARNING

Improper installation, adjustment,

alteration, service or maintenance

can cause property damage,

personal injury or loss of life. Startup

and service must be performed by a

Factory Trained Service Technician.

WARNING

Before completing startup and

leaving the unit a complete operating

cycle should be observed to verify

that all components are functioning

properly.

CAUTION

The Clean Air Act of 1990 bans the

intentional venting of refrigerant

(CFC’s and HCFC’s) as of July 1,

1992. Approved methods of recovery,

recycling or reclaiming must be

followed. Fines and/or incarceration

may be levied for non-compliance.

CAUTION

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