Carrier AQUAZONE PSV User Manual download pdf (Page 46)

screen. The following conditions must be true for economizer

operation:

• SAT reading is available.

• LWT reading is available.

• If occupied, the SPT is greater than the occupied cooling

set point or less than the occupied heating set point and

the condenser water is suitable.

• Space temperature reading is valid.

• If unoccupied, the SPT is greater than the unoccupied

cooling set point or less than the unoccupied heating set

point and the condenser water is suitable.

Modulating Water Economizer Control

— The control has

the capability to modulate a water valve to control condenser

water flowing through a coil on the entering air side of the unit.

Cooling — The purpose is to provide an economizer cooling

function by using the water loop when the entering water loop

temperature is suitable (at least 5 F below space temperature).

If the water loop conditions are suitable, then the valve will

modulate open as required to maintain a supply-air temperature

that meets the load conditions. Should the economizer coil ca-

pacity alone be insufficient for a period greater than 5 minutes,

or should a high humidity condition occur, then the compressor

will also be started to satisfy the load. Should the SAT ap-

proach the minimum cooling SAT limit, the economizer valve

will modulate closed during compressor operation.

Hea ting — Additionally, the control will modulate the water

valve should the entering water loop temperature be suitable

for heating (at least 5 F above space temperature) and heat is

required. The valve will be controlled in a similar manner ex-

cept to satisfy the heating requirement. Should the economizer

coil capacity alone be insufficient to satisfy the space load con-

ditions for more than 5 minutes, then the compressor will be

started to satisfy the load. Should the SAT approach the maxi-

mum heating SAT limit, the economizer valve will modulate

closed during compressor operation.

Two-Position Water Economizer Control

— The control has

the capability to control a NO or NC, two-position water valve

to control condenser water flow through a coil on the entering

air side of the unit.

Cooling — The purpose is to provide a cooling economizer

function directly from the condenser water loop when the en-

tering water loop temperature is suitable (at least 5 F below

space temperature). If the optional coil is provided and the wa-

ter loop conditions are suitable, then the valve will open to pro-

vide cooling to the space when required. Should the capacity

be insufficient for a period greater than 5 minutes, or should a

high humidity condition occur, then the compressor will be

started to satisfy the load. Should the SAT reach the minimum

cooling SAT limit, the economizer valve will close during

compressor operation.

Hea ting — Additionally, the economizer control will open the

water valve should the entering water loop temperature be suit-

able for heating (at least 5 F above space temperature) and

heat is required. The valve will be controlled in a similar man-

ner except to satisfy the heating requirement. Should the coil

capacity be insufficient to satisfy the space load for more than

5 minutes, then the compressor will be started to satisfy the

load. Should the SAT reach the maximum heating SAT limit,

the economizer valve will close during compressor operation.

DEMAND LIMIT — The WSHP Open controller has the

ability to accept three levels of demand limit from the network.

In response to a demand limit, the unit will decrease its heating

set point and increase its cooling set point to widen the range in

order to immediately lower the electrical demand. The amount

of temperature adjustment in response is user adjustable for

both heating and cooling and for each demand level. The re-

sponse to a particular demand level may also be set to zero.

CONDENSER WATER LINKAGE — The control pro-

vides optimized water loop operation using an universal

controller (UC) open loop controller. Loop pump operation is

automatically controlled by WSHP equipment occupancy

schedules, unoccupied demand and tenant override conditions.

Positive pump status feedback prevents nuisance fault trips.

The condenser water linkage operates when a request for con-

denser water pump operation is sent from each WSHP to the

loop controller. This request is generated whenever any WSHP

is scheduled to be occupied, is starting during optimal start (for

warm-up or pull down prior to occupancy), there is an

unoccupied heating or cooling demand, or a tenant pushbutton

override. At each WSHP, the water loop temperature and the

loop pump status is given. The WSHP will NOT start a com-

pressor until the loop pumps are running or will shutdown the

compressors should the pumps stop. This prevents the WSHP

from operating without water flow and thus tripping out on re-

frigerant pressure, causing a lockout condition. The WSHP

Open controller control will prevent this from occurring. Also,

the loop controller can be configured to start the pumps only

after a configurable number of WSHPs are requesting opera-

tion (from 1-"N"). This can be used to prevent starting the en-

tire loop operation for only one WSHP. Meanwhile, the

WSHPs will not operate if the loop pump status is off and

therefore the WSHP compressor will not run.

COMPLETE C AND DELUXE D BOARD

SYSTEM TEST

Test mode provides the ability to check the control opera-

tion in a timely manner. The control enters a 20-minute test

mode by momentarily shorting the test terminals. All time de-

lays are sped up 15 times. The follow operations are common

to both Complete C and Deluxe D controls.

Test Mode — To enter Test mode, cycle the power 3 times

within 60 seconds. The LED will flash a code representing the

last fault when entering the Test mode. The alarm relay will

also power on and off during Test mode. See Tables 34 and 35.

To exit Test mode, short the terminals for 3 seconds or cycle

the power 3 times within 60 seconds.

NOTE: The flashing code and alarm relay cycling code will

both have the same numerical label. For example, flashing

code 1 will have an alarm relay cycling code 1. Code 1 indi-

cates the control has not faulted since the last power off to

power on sequence.

Table 34 — Complete C Control Current LED

Status and Alarm Relay Operations

LEGEND

NOTES:

1. Slow flash is 1 flash every 2 seconds.

2. Fast flash is 2 flashes every 1 second.

3. EXAMPLE: “Flashing Code 2” is represented by 2 fast flashes followed by a

10-second pause. This sequence will repeat continually until the fault is cleared.

LED STATUS DESCRIPTION OF OPERATION ALARM RELAY

Normal Mode Open

Normal Mode with PM Warning

Cycle (closed 5 sec.,

open 25 sec.)

Off Complete C Control is non-functional Open

Slow Flash Fault Retry Open

Fast Flash Lockout Closed

Slow Flash Over/Under Voltage Shutdown

Open, (Closed after

15 minutes)

Flashing Code 1 Test Mode — No fault in memory Cycling Code 1

Flashing Code 2 Test Mode — HP Fault in memory Cycling Code 2

Flashing Code 3 Test Mode — LP Fault in memory Cycling Code 3

Flashing Code 4 Test Mode — FP1 Fault in memory Cycling Code 4

Flashing Code 5 Test Mode — FP2 Fault in memory Cycling Code 5

Flashing Code 6 Test Mode — CO Fault in memory Cycling Code 6

Flashing Code 7

Test Mode — Over/Under

shutdown in memory

Cycling Code 7

Flashing Code 8 Test Mode — PM in memory Cycling Code 8

Flashing Code 9

Test Mode — FP1/FP2

Swapped Fault in memory

Cycling Code 9

CO — Condensate Overflow LED — Light-Emitting Diode

FP — Freeze Protection LP — Low Pressure

HP — High Pressure PM — Performance Monitor

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 67 68

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