Carrier 50HQ User Manual download pdf (Page 3)

compressor section from 3 sides.

Additional panels are provided to

access the blower and control box sec-

tions.

The blower housing assembly can be

serviced without disconnecting duct-

work from the dedicated blower access

panel. Blower units are provided with

permanently lubricated bearings for

worry-free performance.

Electrical disconnection of the

blower motor and control box is easily

accomplished from quick disconnects

on each component.

Easy removal of the control box

from the unit provides access to all

refrigeration components.

The refrigeration circuit is easily

tested and serviced through the use of

high and low pressure ports integral to

the refrigeration circuit.

Maximum control flexibility

Aquazone water source heat pumps

provide reliable control operation using

a standard microprocessor board with

flexible alternatives for many direct dig-

ital control (DDC) applications includ-

ing the Carrier Comfort Network®

(CCN) and open protocol systems.

Carrier’s Aquazone standard unit

solid-state control system, the Com-

plete C, provides control of the unit

compressor, reversing valve, fan, safety

features, and troubleshooting fault indi-

cation features. The Complete C con-

trol system is one of the most user

friendly, low cost, and advanced con-

trol boards found in the WSHP indus-

try. Many features are field selectable

to provide the ultimate in field installa-

tion flexibility. The overall features of

this standard control system include:

75-va transformer assists in accom-

modating accessory loads.

Anti-short cycle timer provides a

minimum off time to prevent the unit

from short cycling. The 5-minute timer

energizes when the compressor is

deenergized, resulting in a 5-minute

delay before the unit can be restarted.

Random start relay ensures a ran-

dom delay in energizing each different

WSHP unit. This option minimizes

peak electrical demand during start-up

from different operating modes or after

building power outages.

High and low pressure refrigerant

protection safeguards against unreli-

able unit operation and prevents refrig-

erant from leaking.

Condensate overflow sensor,

mounted to the drain pan, recognizes

thirty continuous seconds of conden-

sate pan overflow as a fault. When

condensate pan liquid reaches an unac-

ceptable level, unit is automatically

deactivated and placed in a lockout

condition.

High and low voltage protection

safe guards against excessive or low

voltage conditions.

Automatic intelligent reset auto-

matically restarts unit 5 minutes after

shutdown if the fault has cleared.

Should a fault occur 3 times sequen-

tially, lockout will occur.

Accessory output (24-v) is provided

to cycle a motorized water valve or

damper actuator with compressor in

applications such as variable speed

pumping arrangements.

Performance Monitor (PM) feature

monitors water temperatures to warn

when the heat pump is operating inef-

ficiently or beyond typical operating

range. Field selectable switch initiates a

warning code on the unit display.

Water coil freeze protection

(selectable for water or anti-

freeze) field selectable switch for water

and water/glycol solution systems initi-

ates a fault when temperatures exceed

the selected limit for 30 continuous

seconds.

Air coil freeze protection (check

filter operation) field selectable

switch for assessing excessive filter

pressure drop initiates a fault when

temperatures exceed the selected limit

for 30 continuous seconds.

Alarm relay setting is a selectable

24-v or pilot duty dry contact for pro-

viding activation of a remote alarm.

Electric heat option output pro-

vided on the controller for operating

two stages of emergency electric heat.

Service test mode with diagnostic

LED (Light-emitting diode) allows

service personnel to check the opera-

tion of the WSHP and control system

efficiently. Upon entering Test mode,

time delays are sped up, and the Status

LED will flash a code to indicate the

last fault experienced for easy diagno-

sis. Based on the fault code flashed by

the status LED, system diagnostics are

assisted through the use of Carrier pro-

vided troubleshooting tables for easy

reference to typical problems.

LED visual output indicates high

pressure, low pressure, low voltage,

high voltage, air/water freeze protec-

tion, condensate overflow, and control

status on an LED panel.

Open protocol for diverse control

(LON controller) option is ideal

when building automation requires

interoperability across diverse control

platforms. This LONMark* compliant

offering can operate as standalone or

as a part of Local Operating Network

(LON) via the LonWorks* FTT-10

Free

Topology communication network.

Fac-

tory completed, pre-engineered appli-

cations specific to Aquazone water

source heat pumps and digital wall sen-

sors communicating over Sensor Link

(S-Link) communication protocol com-

pletes a system of networked control.

Carrier’s PremierLink™ con-

troller adds reliability, effi-

ciency, and simplification

The PremierLink direct digital control-

ler can be ordered as a factory-installed

option. Designed and manufactured

exclusively by Carrier, the controller

can be used to actively monitor and

control all modes of operation as well

as monitor the following diagnostics

and features: unit number, zone tem-

perature, zone set point, zone humidity

set point, discharge-air temperatures,

fan status, stages of heating, stages of

cooling, outdoor-air temperature,

leaving-air temperature, leaving water

temperature, alarm status, and alarm

lockout condition.

This controller has a 38.4K baud

communications capability and is

compatible with ComfortLink™ con-

trols, CCN and ComfortVIEW™ soft-

ware. The scrolling marquee and Navi-

gator™ display are optional tools that

can be used for programming and

monitoring the unit for optimal perfor-

mance. The addition of an accessory

sensor in the conditioned space

provides ASHRAE 62-99 compliance

and demand controlled ventilation

(DCV). A DCV control strategy is espe-

cially beneficial for a water source heat

pump system to minimize the energy

utilized to condition ventilation air.

The DCV approach enhances the en-

ergy efficient performance of the

Aquazone™ units.

The PremierLink peer-to-peer, Internet

ready communicating control is

designed specifically for constant vol-

ume (CV) and variable volume and vari-

able temperature (VVT®) applications.

This comprehensive controls system

allows water source heat pumps to be

linked together to create a fully func-

tional HVAC (heating, ventilation, and

air conditioning) automation system.

* Registered trademark of Echelon Corporation.

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