35Deluxe D Control Accessory Relay Configura-tions — The following accessory relay settings are applica-ble for Deluxe D control:CYCLE WITH FAN — In this configuration, the accessoryrelay 1 will be ON any time the Fan Enable relay is on.CYCLE WITH COMPRESSOR — In this configuration, theaccessory relay 2 will be ON any time the Compressor relayis on.DIGITAL NIGHT SET BACK (NSB) — In this configura-tion, the relay will be ON if the NSB input is connected toground C.NOTE: If there are no relays configured for digital NSB, thenthe NSB and override (OVR) inputs are automatically config-ured for mechanical operation.MECHANICAL NIGHT SET BACK — When NSB input isconnected to ground C, all thermostat inputs are ignored. Athermostat set back heating call will then be connected to theOVR input. If OVR input becomes active, then the Deluxe Dcontrol will enter night low limit (NLL) staged heating mode.The NLL staged heating mode will then provide heating dur-ing the NSB period.WATER VALVE (SLOW OPENING) — If relay is configuredfor Water Valve (slow opening), the relay will start 60 secondsprior to starting compressor relay.OUTSIDE AIR DAMPER (OAD) — If relay is configured forOAD, the relay will normally be ON any time the Fan Enablerelay is energized. The relay will not start for 30 minutes fol-lowing a return to normal mode from NSB, when NSB is nolonger connected to ground C. After 30 minutes, the relay willstart if the Fan Enable is set to ON.START-UPUse the procedure outlined below to initiate proper unitstart-up.NOTE: This equipment is designed for indoor installation only.Operating LimitsENVIRONMENT — This equipment is designed for indoorinstallation ONLY. Extreme variations in temperature, humidi-ty and corrosive water or air will adversely affect the unit per-formance, reliability and service life.POWER SUPPLY — A voltage variation of ± 10% of name-plate utilization voltage is acceptable.UNIT STARTING CONDITIONS — Units start and operatein an ambient temperature of 45 F with entering-air tempera-ture at 50 F, entering-water temperature at 60 F and with bothair and water at the flow rates used.NOTE: These operating limits are not normal or continuousoperating conditions. Assume that such a start-up is for thepurpose of bringing the building space up to occupancy tem-perature. See Table 18 for operating limits.1. Restore power to system.2. Turn thermostat fan position to ON. Blower should start.3. Balance airflow at registers.4. Adjust all valves to the full open position and turn on theline power to all heat pump units.5. Operate unit in the cooling cycle. Refer to Table 14 forunit operating limits.NOTE: Three factors determine the operating limits of a unit:(1) entering air temperature, (2) water temperature and (3)ambient temperature. Whenever any of these factors are at aminimum or maximum level, the other two factors must be at anormal level to ensure proper unit operation. See Table 18.Table 18 — Operating Limits —50PSH, PSV, PSD UnitsLEGENDNOTE: Value in heating column is dry bulb only. Any wet bulb reading isacceptable.Scroll Compressor Rotation — It is important to becertain compressor is rotating in the proper direction. Todetermine whether or not compressor is rotating in the properdirection:1. Connect service gages to suction and discharge pressurefittings.2. Energize the compressor.3. The suction pressure should drop and the dischargepressure should rise, as is normal on any start-up.If the suction pressure does not drop and the dischargepressure does not rise to normal levels:1. Turn off power to the unit. Install disconnect tag.2. Reverse any two of the unit power leads.3. Reapply power to the unit and verify pressures are correct.The suction and discharge pressure levels should now moveto their normal start-up levels.When the compressor is rotating in the wrong direction, theunit makes more noise and does not provide cooling.After a few minutes of reverse operation, the scroll com-pressor internal overload protection will open, thus activatingthe unit lockout. This requires a manual reset. To reset, turn thethermostat on and then off.NOTE: There is a 5-minute time delay before the compressorwill start.Unit Start-Up Cooling Mode1. Adjust the unit thermostat to the warmest position.Slowly reduce the thermostat position until the compres-sor activates.2. Check for cool air delivery at unit grille a few minutesafter the unit has begun to operate.3. Verify that the compressor is on and that the water flowrate is correct by measuring pressure drop through theheat exchanger using P/T plugs. See Table 19. Check theelevation and cleanliness of the condensate lines; anydripping could be a sign of a blocked line. Be sure thecondensate trap includes a water seal.CAUTIONTo avoid equipment damage, DO NOT leave system filledin a building without heat during the winter unless anti-freeze is added to system water. Condenser coils neverfully drain by themselves and will freeze unless winterizedwith antifreeze.WARNINGWhen the disconnect switch is closed, high voltage ispresent in some areas of the electrical panel. Exercise cau-tion when working with the energized equipment. Failureto heed this warning may result in personal injury.AIR LIMITS COOLING (F) HEATING (F)Min. Ambient Air 45 39Rated Ambient Air 80.6 68Max. Ambient Air 110 85Min. Entering Air 50 40Rated Entering Air db/wb 80/67 68Max. Entering Air db/wb 110/83 80WATER LIMITSMin. Entering Water 30 20Normal Entering Water 50-110 30-70Max. Entering Water 120 90db — Dry Bulbwb — Wet Bulb