Carrier RVC Control Accessory Relay Configurations, Start-Up, HWR Operating Modes, Output, Reheat

Page 32

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 start-up.

NOTE: This equipment is designed for indoor installation only.

Table 17 — HWR Operating Modes

MODE

 

 

INPUT

 

 

 

 

OUTPUT

 

 

O

G

Y1

Y2*

H

O

G

Y1

Y2*

Reheat

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Water Out

 

 

 

 

 

 

 

Refrigerant In

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(To Water Loop)

Mixing Valve

 

 

 

 

 

(Cooling)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Water In

 

Internal Pump

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COAX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(From Water Loop)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refrigerant Out

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a50-8145.eps

 

 

 

(Cooling)

Entering Air

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: All components shown are

Evaporator Coil

internal to the heat pump unit.

 

Leaving

Air

Reheat

Coil

Fig. 28 — HWR Schematic

32

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Contents Contents Safety ConsiderationsInstallation GeneralPage Physical Data Aquazone 50RHC,RVC006-060 Units PSC FAN Motor and BlowerPermanent Split Capacitor Physical Data Aquazone 50RHR,RVR006-060 UnitsPhysical Data Aquazone 50RHS,RVS,RDS015-070 Units Right Airflow ConfigurationCode Return Discharge Ext Power Cond Therm Supply Return Depth Height Out Pump Supply Ensate015-024 030Back Right Right BackTypical Installation 50RHC,RHR,RHS Units Top Right TopConfiguration Top View-Left Return Configuration Left Return Left ViewIsometric ViewConfiguration Left Return Left View Air Coil Opening Isometric ViewCode Front ViewHt Return/Bottom Discharge Return/Bottom Discharge Isometric ViewTop View Front-ViewRemove Screws Side DischargeRotate Move to SideMounting the Unit 50RHC Units50RHR Units 50RHS UnitsCondensate Drain Horizontal Unit PitchCondition Acceptable Level Field Power Supply Wiring Field Control WiringLOC BMCNEC ComprTypical Aquazone Deluxe D Control Wiring RVSTrans HpwsLON A50-8154 Low Voltage Field Wiring 50RHC,RVC Electrical Data RLA LRA Motor Unit Circuit FUSE/HACRFLA RLA50RHR,RVR VOLTS-PHASE Voltage Compressor FAN Total MIN MAX 50RHR,RVR Electrical DataUnit Circuit Units RLA LRA FUSE/HACRPRE-START-UP 50RDS, RHS, RVS Electrical DataSpeed 50RHR,RVR Blower Performance50RHR,RVR Rated MIN FAN 50RHC,RVC Blower Performance 50RVC Blower Performance with Hot Water Reheat HWR OptionReheat External Static Pressure ESP Loss Coil Face Velocity 50RHC,RVC Rated MIN FAN50RVC Blower Performance with Wet Coil 50RHS,RVS,RDS Blower PerformanceCoil Face Velocity WET Coil Reduction 50RHS,RVS,RDS Rated FANControl Jumper Settings See Fig Field Selectable Inputs50RHS, RVS Blower Performance with HWR Coil Face 50RHS, RVS with Reheat ESP LossDIP Switch Block S2 Accessory 1 Relay Options DIP Switch Block S2 Accessory 2 Relay OptionsHumidistat/Dehumidistat Logic Deluxe D DIP Switch Settings Accessory DIP Switch Position Relay OptionsControl Accessory Relay Configurations START-UPHWR Operating Modes OutputUnit Start-Up Cooling Mode Water Temperature Change Through Heat ExchangerOperating Limits Operating Limits 50RHC,RVC UnitsUnit Start-Up Heating Mode Typical Unit Operating Pressures and TemperaturesEntering Cooling Heating Water GPM Temp F TON50RHC,RVC Coaxial Water Pressure Drop 50RHR,RVR Coaxial Water Pressure Drop50RHS,RVS,RDS Coaxial Water Pressure Drop Approximate Fluid Volume gal Per 100 Ft of Pipe Antifreeze Percentages by VolumeOperation Units with Aquazone Complete C ControlSystem Test Complete C Control LED Code Fault DescriptionsUnits with HWR Option ESD ServiceAquazone Deluxe D Control LED Indica Gravity Flow Method Air Coil Fan Motor Removal TroubleshootingRefrigerant Charging Troubleshooting Fault Heating Cooling Possible Cause SolutionUnit Does Not Operate 50RHC,RVC,RHR,RHS,RVR,RVS,RDS START-UP Checklist II. START-UPHeating Cycle Analysis Cooling Cycle Analysis
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