Carrier 30GTR Specifications download pdf (Page 66)

Consult application data section in the Product Data lit-

erature and job design requirements to determine ﬂow rate

requirements for a particular installation.

Table 34 — Nominal and Minimum Cooler

Fluid Flow Rates

30GTN,R

UNIT

SIZE

NOMINAL FLOW

RATE*

MINIMUM FLOW

RATE (See Notes)

Gpm L/s Gpm L/s

040 86 5.43 36.8 2.32

045 101 6.37 37.7 2.38

050 123 7.76 37.7 2.38

060 151 9.53 47.5 3.00

070 173 10.91 47.5 3.00

080,230B 192 12.11 66.7 4.20

090,245B 216 13.62 59.5 3.75

100,255B,270B 240 15.14 84.1 5.30

110,290B,315B 264 16.65 84.1 5.30

130 300 18.9 110 6.9

150,230A-255A 348 21.9 110 6.9

170,270A,330A/B,

360B (50 Hz)

384 24.2 120 7.5

190,290A,360A/B (60 Hz),

360A (50 Hz),390B

432 27.2 120 7.5

210,315A,390A,420A/B 480 30.2 148 9.3

LEGEND

ARI — Air Conditioning and Refrigeration Institute

Gpm — Gallons per minute (U.S.)

L/s — Liters per second

N—Liters per kW

V—Gallons per ton

*Nominalﬂowrates requiredatARI conditionsare44 F(6.7C) leaving-

ﬂuid temperature, 54 F (12.2 C) entering-ﬂuid temperature, 95 F

(35 C) ambient. Fouling factor is .00001 ft

• hr • F/Btu (.000018 m

• K/W).

NOTES:

1. Minimum ﬂow based on 1.0 fps (0.30 m/s) velocity in cooler with-

out special cooler baffling.

2. Minimum Loop Volumes:

Gallons=VxARICap. in tons

Liters = N x ARI Cap. in kW

APPLICATION V N

Normal Air Conditioning 3 3.25

Process Type Cooling 6 to 10 6.5 to 10.8

Low Ambient Unit Operation 6 to 10 6.5 to 10.8

Operation Sequence — During unit off cycle, crank-

case heaters are energized. If ambient temperature is below

36 F (2 C), cooler heaters (if equipped) are energized.

The unit is started by putting the ENABLE/OFF/REMOTE

CONTACT switch in ENABLE or REMOTE position. When

the unit receives a call for cooling (either from the internal

control or CCN network command or remote contact clo-

sure), the unit stages up in capacity to maintain the cooler

ﬂuid set point. The ﬁrst compressor starts 1

⁄

to 3 minutes

after the call for cooling.

The lead circuit can be speciﬁcally designated or ran-

domly selected by the controls, depending on how the unit

is ﬁeld conﬁgured (for 040-070 sizes, Circuit A leads unless

an accessory unloader is installed on Circuit B). A ﬁeld con-

ﬁguration is also available to determine if the unit should

stage up both circuits equally or load one circuit completely

before bringing on the other.

When the lead circuit compressor starts, the unit starts with

a pumpout routine. On units with the electronic expansion

valve (EXV), compressor starts and continues to run with

the EXV at minimum position for 10 seconds to purge the

refrigerant lines and cooler of refrigerant. The EXV then moves

to 23% and the compressor superheat control routine takes

over, modulating the valve to feed refrigerant into the cooler.

On units with thermostatic expansion valve (TXV)

(30GTN,R040,045 units with brine option), head pressure

control is based on set point control. When the lead com-

pressor starts, the liquid line solenoid valve (LLSV) is kept

closed for 15 seconds by a time delay relay. The micro-

processor stages fans to maintain the set point temperature

speciﬁed by the controller. There is no pumpout sequence

during shutdown of TXV controlled chillers.

On all other units (EXV units), the head pressure is con-

trolled by fan cycling. The desired head pressure set point is

entered, and is controlled by EXV position or saturated con-

densing temperature measurement (T3 and T4). For proper

operation, maintain set point of 113 F (45 C) as shipped from

factory. The default head pressure control method is set point

control. The head pressure control can also be set to EXV

control or a combination of the 2 methods between circuits.

For all units, if temperature reset is being used, the unit

controls to a higher leaving-ﬂuid temperature as the build-

ing load reduces. If demand limit is used, the unit may tem-

porarily be unable to maintain the desired leaving-ﬂuid tem-

perature because of imposed power limitations.

On EXV units, when the occupied period ends, or when

the building load drops low enough, the lag compressors shut

down.The lead compressors continue to run as the EXVcloses,

and until the conditions of pumpout are satisﬁed. If a fault

condition is signaled requiring immediate shutdown,

pumpout is omitted.

Loading sequence for compressors is shown in Tables 5A

and 5B.

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Carrier 30GTR Specifications Page 66

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