Daikin Enfinity CCW Installation And Maintenance Manual

Daikin Enfinity CCW Installation And Maintenance Manual Manual pdf 26 page image

IM 1049-9 26 www.DaikinApplied.comCAUTIONUnits must be checked for water leaks upon initial water systemstart-up. Water leaks may be a result of mishandling or damageduring shipping. Failure by the installing contractor to check forleaks upon start-up of the water system could result in propertydamage.1 Open all valves to full open position and turn onpower to the unit.2 Set the thermostat for "Fan Only" operation byselecting "Off" at the system switch and "On" at thefan switch. If "Auto" fan operation is selected, thefan will cycle with the compressor.3 For those units that have two-speed motors,reconnect for low speed operation if necessary.4 Set thermostat to “Cool.” If the thermostat is anautomatic changeover type, simply set the coolingtemperature to the lowest temperature. On manualchangeover types, additionally select “Cool” at thesystem switch.Again, many units have time delays help protect thecompressor(s) against short cycling.After a few minutes of operation, check thedischarge grilles for cool air delivery. Measurethe temperature difference between entering andleaving water. It should be approximately 1-1⁄2times greater than the heating mode temperaturedifference. For example, if the cooling temperaturedifference is 15°F (8°C), the heating temperaturedifference should be 10°F (5°C).Without automatic flow control valves, target acooling temperature difference of 10°F to 14°F (5°Cto 8°C). Adjust the combination shutoff/balancingvalve in the return line to a water flow rate which willresult in the 10˚F to 14°F (5°C to 8°C) difference.5 Set thermostat to “Heat.” If the thermostat is theautomatic changeover type, set system switch tothe “Auto” position and depress the heat setting tothe highest temperature. Some units have built-intime delays which prevent the compressor fromimmediately starting. With most control schemes,the fan will start immediately. After a few minutes ofcompressor operation, check for warm air deliveryat discharge grille. If this is a “cold building” start-up, leave unit running until return air to the unit is atleast 65°F (18°C).start - uP