Carrier 30RAP010-060 specifications Optional Factory-Installed Hydronic Pack, Ccn

Table 21 — Control Methods and Cooling Set Points

	CONTROL	OCCUPANCY		COOLING SET POINT SELECT (CLSP)
	TYPE	STATE	0	1	2	3
	(CTRL)		(single)	(dual, switch)	(dual, occ)	(4 to 20 mA)
0	(switch)	Occupied	ON,CSP1	ON*	ON,CSP1	ON†
		Unoccupied	ON,CSP1	ON*	ON,CSP2	ON
2	(Occupancy)	Occupied	ON,CSP1	ON*	Illegal	ON†
		Unoccupied	OFF	OFF	Illegal	OFF
3	(CCN)	Occupied	ON,CSP1	ON*	ON,CSP1	ON†
		Unoccupied	ON,CSP1	ON*	ON,CSP2	ON†

*Dual set point switch input used. CSP1 used when switch input is open. CSP2 used when switch input is closed. †Cooling set point determined from 4 to 20 mA input to energy management module (EMM) to terminals TB6-3,5.

4 TO 20 mA INPUT — Unit operation is based on an external 4 to 20 mA signal input to the Energy Management Module (EMM).

Low Sound Mode Operation — All models are fac- tory configured with the Low Sound Mode disabled. In the Configuration mode under sub-mode OPT2, items for Low Sound Mode Select (Configuration→OPT2→LS.MD), Low Sound Start Time (Configuration→OPT2→LS.ST), Low Sound End Time (Configuration→OPT2→LS.ND) and Low Sound Capacity Limit (Configuration→OPT2→LS.LT) are factory configured so that the chiller always runs as quietly as possible. This results in operation at increased saturated con- densing temperature. As a result, some models may not be able to achieve rated efficiency. For chiller operation at rated effi- ciency, disable the low sound mode or adjust the low sound mode start and stop times accordingly or set both times to 00:00 for rated efficiency operation 24 hours per day. In addi- tion, the low sound capacity limit can be used to reduce overall chiller capacity, if required, by limiting the maximum to a user- configured percentage.

Heating Operation — The chiller can be used for pump outputs or optional factory-installed hydronic system operation can be utilized for heating applications. The heating mode is activated when the control sees a field-supplied closed switch input to terminal block LVT-19,20. The control locks out cool- ing when the heat relay input is seen. A field-supplied boiler re- lay connection is made using heat relay and alarm relay con- tacts. Factory-installed ‘BOILER’ connections exist in the con- trol panel near LVT for these applications. Alarms and alerts A189 through A202 are active during heating operation.

Service Test (See Table 4) — Both main power and control circuit power must be on.

The Service Test function should be used to verify proper operation of condenser fan(s), compressors, minimum load valve solenoid (if installed), cooler pump(s), EXVs, and re- mote alarm relay. To use the Service Test mode, the Enable/ Off/Remote Contact switch must be in the OFF position. Use the display keys and Table 4 to enter the mode and display TEST. Press ENTER twice so that OFF flashes. Enter the password if required. Use either arrow key to change the TEST value to the ON position and press ENTER . Press ESCAPE and the button to enter the OUTS or COMP sub-mode.

Test the condenser fans, cooler pump(s) and alarm relay by changing the item values from OFF to ON. These discrete outputs are then turned off if there is no keypad activity for 10 minutes. Use the arrow keys to select the desired percentage when testing expansion valves and Motormaster® V controller. When testing compressors, lead compressor must be started first. All compressor outputs can be turned on, but the control will limit the rate by staging one compressor per minute. Com- pressor unloaders and hot gas bypass relays/solenoids (if in- stalled) can be tested with the compressors on or off. The relays

under the COMP mode will stay on for 10 minutes if there is no keypad activity. Compressors will stay on until they are turned off by the operator. The Service Test mode will remain enabled for as long as there is one or more compressors run- ning. All safeties are monitored during this test and will turn a compressor, circuit or the machine off if required. Any other mode or sub-mode can be accessed, viewed, or changed during the TEST mode. The MODE item (Run Status→VIEW) will display “0” as long as the Service mode is enabled. The TEST sub-mode value must be changed back to OFF before the chill- er can be switched to Enable or Remote contact for normal operation.

Optional Factory-Installed Hydronic Pack-

age — If the chiller has factory-installed chilled fluid pumps, specific steps should be followed for proper operation.

The pump(s) in the hydronic package come factory pre-wired into the main unit power supply/starter. In order to check proper pump rotation, use the Service Test function to test the condenser fans and observe them for proper rotation. If fans turn correctly, the pumps will rotate correctly. Clockwise rotation of the pump motor cooling fans can also be used to de- termine that pumps are rotating correctly.

CAUTION

Operation of pump in wrong direction, even for a few seconds, can cause irreversible damage to pump impeller and housing. Always verify correct wiring/pump rotation before operation.

Use Service Test function to test operation of pumps. Verify that the flow switch input is made when the pump is running. For dual pump hydronic systems, the control only uses one pump at a time. Consult the Installation Instructions supplied with this chiller and use the circuit setter balancing valve installed in hydronic package to adjust fluid flow rate.

Cooler Pump Control — The AquaSnap® 30RAP ma- chines equipped with a factory-installed pump package are configured with the Cooler Pump Control (Configura- tion→OPT1→CPC) = ON.

Machines not equipped with a pump package are config- ured with the cooler pump control OFF. It is recommended that the machine control the chilled water pump. If not, a 5-minute time delay is required after the command to shut the machine down is sent before the chilled water pump is turned off. This is required to maintain water flow during the shutdown period of the machine.

With or without this option enabled, the cooler pump relay will be energized when the machine enters an ON status (i.e., On Local, On CCN, On Time). An A207 - Cooler Freeze Protection Alarm, will energize the cooler pump relay also, as an override. The cooler pump relay will remain energized if the machine is in MODE 10 – Minimum Off Time.

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