Carrier AQUAZONE 50RHC Installation And Service Instructions Manual

Also see for AQUAZONE 50RHC: Operating and troubleshooting

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Carrier AQUAZONE 50RHC Installation And Service Instructions Manual Manual pdf 32 page image

32during the reheat mode of operation. The hydronic coil is uti-lized during the reheat mode of operation to reheat the air to theset point of the proportional controller. Condenser water is di-verted by the motorized valve and pumped through the hydron-ic coil by the loop pump in proportion to the control set point.The amount of reheating is dependent on the set point and howfar from the set point the supply air temperature is. The factoryset point is 70 to 75 F, generally considered "neutral" air.D Control Accessory Relay Configurations —The following accessory relay settings are applicable for bothD controls only:CYCLE WITH FAN — In this configuration, the relay will beON any time the Fan Enable relay is on.CYCLE WITH COMPRESSOR — In this configuration, therelay will be ON any time the Compressor relay is 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 D controlwill enter Night Low Limit (NLL) staged heating mode. TheNLL staged heating mode will then provide heating during theNSB period.Water Valve (Slow Opening) — If relay is config-ured for Water Valve (slow opening), the relay will start 60 sec-onds prior to starting compressor relay.Outside Air Damper (OAD) — If relay is configuredfor OAD, the relay will normally be ON any time the FanEnable relay is energized. The relay will not start for30 minutes following a return to normal mode from NSB,when NSB is no longer connected to ground C. After 30 min-utes, the relay will start 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.To 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.Table 17 — HWR Operating Modes*Not applicable for single stage units; Full load operation for dual capacity units.†Cooling input takes priority over dehumidify input.**Deluxe D is programmed to ignore the H demand when the unit is in heating mode.NOTE: On/Off is either on or off.MODE INPUT OUTPUTO G Y1 Y2* H O G Y1 Y2* ReheatNo Demand On/Off Off Off Off Off On/Off Off Off Off OffFan Only On/Off On Off Off Off On/Off On Off Off OffCooling Stage 1 On On On Off Off On On On Off OffCooling Stage 2 On On On On Off On On On On OffCooling and Dehumidistat† On On On On/Off On On On On On/Off OffDehumidistat Only On/Off Off Off Off On On On On On OnHeating Stage 1 Off On On Off Off Off On On Off OffHeating Stage 2 Off On On On Off Off On On On OffHeating and Dehumidistat** Off On On On/Off On Off On On On/Off OffFig. 28 — HWR SchematicWater Out(To Water Loop)Water In(From Water Loop)Mixing ValveCOAXEvaporator CoilReheatCoilRefrigerant Out(Cooling)Refrigerant In(Cooling)Entering Air LeavingAirInternal PumpNOTE: All components shown areinternal to the heat pump unit.a50-8145.eps