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the unit is operating in the dehumidification mode. Water
source heat pumps with HWR should not be used as makeup
air units. These applications should use equipment specifically
designed for makeup air.
HWR COMPONENT EFUNCTIONS — The proportional
controller operates on 24 VAC power supply and automatically
adjusts the water valve based on the supply-air sensor. The sup-
ply-air sensor senses supply-air temperature at the blower inlet,
providing the input signal necessary for the proportional con-
trol to drive the motorized valve during the reheat mode of op-
eration. The motorized valve is a proportional actuator/three-
way valve combination used to divert the condenser water
from the coax to the hydronic reheat coil during the reheat
mode of operation. The proportional controller sends a signal
to the motorized valve based on the supply-air temperature
reading from the supply-air sensor.
The loop pump circulates condenser water through the hy-
dronic reheat coil during the reheat mode of operation (refer to
Fig. 15). In this application, the loop pump is only energized
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.
MODE
No Demand
Fan Only
Cooling Stage 1
Cooling Stage 2
Cooling and Dehumidistat
Dehumidistat Only
Heating Stage 1
Heating Stage 2
Heating and Dehumidistat**
*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.
Water Out
(To Water Loop)
Water In
(From Water Loop)
NOTE: All components shown are
internal to the heat pump unit.
Table 20 — HWR Operating Modes
INPUT
O
G
Y1
On/Off
Off
Off
On/Off
On
Off
On
On
On
On
On
On
†
On
On
On
On/Off
Off
Off
Off
On
On
Off
On
On
Off
On
On
Refrigerant In
Mixing Valve
Internal Pump
Refrigerant Out
(Cooling)
Fig. 15 — HWR Schematic
Deluxe D Control Accessory Relay Configura-
The following accessory relay settings are applica-
tions —
ble for both Deluxe 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 Deluxe 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 min-
utes following a return to normal mode from NSB, when NSB
is no longer connected to ground C. After 30 minutes, the relay
will start if the Fan Enable is set to ON.
Y2*
H
O
Off
Off
On/Off
Off
Off
On/Off
Off
Off
On
On
Off
On
On/Off
On
On
Off
On
On
Off
Off
Off
Off
Off
On
On/Off
On
Off
(Cooling)
COAX
Entering Air
Evaporator Coil
32
OUTPUT
G
Y1
Y2*
Reheat
Off
Off
Off
Off
On
Off
Off
Off
On
On
Off
Off
On
On
On
Off
On/Off
Off
On
On
On
On
On
On
On
On
Off
Off
Off
On
On
On
On
On
On/Off
Off
Leaving
Air
Reheat
Coil
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