Carrier manual Table III Pressure switch settings, 30RA Operating limits, 30RH Operating limits

30RA/30RH

Unit protection devices, operating limits and operating range

Table III: Pressure switch settings

	Cut-out	Reset
High pressurestat	30 bar	Manual

WARNING:

Alteration of factory settings other than the design set-point, without manufacturer's authorisation, may void the warranty.

In case of use other than the manufacturer configuration, Carrier Service must be asked for permission to change the Pro-Dialog Plus system configuration.

30RA - Operating limits

These units have been designed to operate within the following limits:

Evaporator	Minimum° C Maximum° C
Water entering temp. (at start-up)	7,8 *	30
Water leaving temp. (in operation)	5**	13
Water entering temp. (at shut-down)	-	55
Condenser
Air entering temperature	-10	46

30RH - Operating limits

Cooling cycle

Plate heat exchanger	Minimum° C Maximum° C
Water entering temp. (at start-up)	7.8*	30
Water leaving temp. (in operation)	5**	13
Water entering temp. (at shut-down)	-	55
Coil
Air entering temperature	-10	46
Heating cycle
Plate heat exchanger	Minimum° C Maximum° C
Water entering temp. (at start-up)	10	45
Water leaving temp. (in operation)	25	50
Water entering temp. (at shut-down)	-	55
Coil	Minimum° C Maximum° C
Air entering temperature	-10	20

*Contact Carrier if an entering water temperature lower than 7.8 ° C is necessary.

**In case of operation with a leaving temperature of less than 5 ° C, it is necessary to add ethylene glycol to the water in circulation.

Minimum and maximum water flow rates in the plate heat exchangers

30 RA RH

	Minimum flow	Maximum flow	Maximum flow
	rate, l/s	rate, l/s*	rate, l/s**
017	0,45	1,4	1,3
021	0,57	1,6	1,6
026	0,67	2,1	1,9
033	0,87	2,3	2,4

*Maximum water flow rate with an available static pressure of 50 kPa (units with hydronicmodule)

**Maximum water flow rate at a plate heat exchanger pressure drop of 100 kPa (units without hydronic module)

Water circuit water content

Whatever the size of the system, the minimum content of the water circuit is given by the following formula:

Volume = CAP(kW) x N = Litres

where CAP is the nominal system capacity (kW) at nominal operating conditions of the installation.

Application	N
Air conditioning	3.5
Industrial process cooling	See note

This volume is necessary for stable operation and accurate temperature control.

It is often necessary to add a buffer water tank to the circuit in order to achieve the required volume.

NOTE:

For industrial process cooling applications, where high stability of water temperature levels must be achieved, the values above must be increased.

We recommend consulting the factory for these particular applications.

Operating range - 30RA units

°C	50
	46
temperature	42
	38
	34
	30
	26
	22
	18
air	14
	10
Outdoor	6
	2
	-2
	-6
	-10
	-14
	-1	0	1	2	3	4	5	6	7	8	9	10 11 12 13 14
				Leaving water temperature ° C

Operating range - 30RH units

	50
°C	46
	42
temperature	38
	34
	30
	26
	22
	18
	14
air	10
	6
Outdoor	2
	-2
	-6
	-10
	-14
	-1	0	1	2	3	4	5	6	7	8	9	10 11 12 13 14
					Leaving water temperature ° C

°C	25
	20
temperature
	15
	10
	5
air	0
	-5
Outdoor
	-10
	-15
	20	25	30	35	40	45	50	55

Leaving water temperature ° C

Notes:

1. The temperature rise of the water through the plate heat exchanger = 5K.

2. Both the plate exchanger and the circuit inside the hydronic module are protected against frost down to a temperature of -10°C.

Operating range with anti-freeze solution and with special configuration of the Pro-Dialog control system.

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