Carrier PSV, PSD006-070, 50PSH instruction manual Complete C and Deluxe D Board System Test, Off

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.

Heating — 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.

Heating — 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

LED STATUS		DESCRIPTION OF OPERATION			ALARM RELAY
			Normal Mode		Open
	On	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			Cycling Code 7
		shutdown in memory
Flashing Code 8		Test Mode — PM in memory			Cycling Code 8
Flashing Code 9		Test Mode — FP1/FP2			Cycling Code 9
		Swapped Fault in memory
		LEGEND
CO	— Condensate Overflow		LED	— Light-Emitting Diode
FP	— Freeze Protection		LP	— Low Pressure
HP	— High Pressure		PM	— Performance Monitor

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.

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