during the reheat mode of operation. The hydronic coil is uti- lized during the reheat mode of operation to reheat the air to the set 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 how far from the set point the supply air temperature is. The factory set point is 70 to 75 F, generally considered "neutral" air.
D Control Accessory Relay Configurations —
The following accessory relay settings are applicable for both D controls only:
CYCLE WITH FAN — In this configuration, the relay will be ON any time the Fan Enable relay is on.
CYCLE WITH COMPRESSOR — In this configuration, the relay 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 to ground C.
NOTE: If there are no relays configured for digital NSB, then the NSB and override (OVR) inputs are automatically config- ured for mechanical operation.
MECHANICAL NIGHT SET BACK — When NSB input is connected to ground C, all thermostat inputs are ignored. A thermostat set back heating call will then be connected to the OVR input. If OVR input becomes active, then the D control will enter Night Low Limit (NLL) staged heating mode. The
NLL staged heating mode will then provide heating during the NSB 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 configured for OAD, the relay will normally be ON any time the Fan Enable relay is energized. The relay will not start for 30 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.
To avoid equipment damage, DO NOT leave system filled in a building without heat during the winter unless anti- freeze is added to system water. Condenser coils never fully drain by themselves and will freeze unless winterized with antifreeze.
START-UP
Use the procedure outlined below to initiate proper unit
NOTE: This equipment is designed for indoor installation only.
Table 17 — HWR Operating Modes
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O | G | Y1 | Y2* | H | O | G | Y1 | Y2* | Reheat | ||
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No Demand | On/Off | Off | Off | Off | Off | On/Off | Off | Off | Off | Off | |
Fan Only | On/Off | On | Off | Off | Off | On/Off | On | Off | Off | Off | |
Cooling Stage 1 | On | On | On | Off | Off | On | On | On | Off | Off | |
Cooling Stage 2 | On | On | On | On | Off | On | On | On | On | Off | |
Cooling and Dehumidistat† | On | On | On | On/Off | On | On | On | On | On/Off | Off | |
Dehumidistat Only | On/Off | Off | Off | Off | On | On | On | On | On | On | |
Heating Stage 1 | Off | On | On | Off | Off | Off | On | On | Off | Off | |
Heating Stage 2 | Off | On | On | On | Off | Off | On | On | On | Off | |
Heating and Dehumidistat** | Off | On | On | On/Off | On | Off | On | On | On/Off | Off |
*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.
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Water Out |
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(To Water Loop) | Mixing Valve |
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Water In |
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NOTE: All components shown are | Evaporator Coil |
internal to the heat pump unit. |
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Leaving
Air
Reheat
Coil
Fig. 28 — HWR Schematic
32
