Carrier 16JB Manuel d'utilisateur télécharger pdf (Page 27)

2. Safeties:

a. Unit shall automatically shut down when any

of the following conditions occur: (Each of

these protective limits shall require manual

reset and cause an alarm message to be dis-

played on the LCD screen, informing the

operator of the shutdown cause.)

• solution pump motor overload/high

temperature

• refrigerant pump motor overload/high

temperature

• low chilled water temperature

• low evaporator refrigerant temperature

• generator high solution temperature

• loss of evaporator water ﬂow

• loss of cooling water ﬂow

• prolonged warm-up period

b. The control system shall detect conditions

which approach protective limits and take

self-corrective action prior to an alarm

occurring. The system shall automatically re-

duce chiller capacity when any of the

following parameters are outside their

normal operating range:

• low evaporator refrigerant temperature.

• generator high saturation temperature

• generator high solution temperature

• high solution concentration

During the capacity override period, a pre-

alarm (alert) message shall be displayed

informing the operator which condition is

causing the capacity override. Once the con-

dition is again within acceptable limits, the

override condition shall terminate and the

chiller shall revert to normal chilled water

control. If during either condition the protec-

tive limit is reached, the chiller shall shut

down, an alarm shall be generated, and a

text message shall be displayed informing

the operator which condition caused the

shut down and alarm.

3. Diagnostics and Service:

a. The control system shall execute a series of

pre-start checks whenever a start command

is received to determine if pressures,

temperatures, and timers are within prestart

limits, thereby allowing start-up to proceed.

If any of the limits are exceeded a text alert

message will be displayed informing the op-

erator of the cause of the pre-start alert.

b. The control system shall provide a manual

test which permits selection and test of indi-

vidual control components and inputs. A

thermistor test and transducer test shall

allow display on the LCD screen of the ac-

tual reading of each transducer and each

thermistor installed on the chiller.

A pump test shall automatically energize the

chilled water and condenser water pumps,

and the control system shall conﬁrm water

ﬂows have been established and require op-

erator conﬁrmation prior to proceeding to

the next test.

A steam control valve test shall allow the op-

erator to test the control valve travel range

by manually increasing or decreasing valve

travel limit. Upon completion of the steam

control valve test the control valve shall re-

vert to the closed position.

c. All sensors shall have quick disconnects to

allow replacement of the sensor without re-

placement of the entire sensor wire.

4. Building Control System Interface:

The chiller control system shall have the ability to

interface and communicate directly to the build-

ing control system without the use of additional

ﬁeld installed hardware and software. The build-

ing control system and the absorption chiller must

be supplied by the same manufacturer. If different

building control and chiller suppliers are chosen

the chiller shall be supplied with a dataport mod-

ule which shall translate the information in the

chiller microprocessor to an ASCII stream of data

which can be read by any manufacturer’s building

management control system.

G. Electrical Requirements:

1. Power supply to the unit shall be 3-ph, 60 Hz

with voltages of 208, 230, 460, or 575 and

3-ph, 50 Hz with 400 v as speciﬁed on the equip-

ment schedule. A multitap transformer shall pro-

vide 110 v single-phase secondary power for the

control panel.

2. Contractor shall supply and install the electrical

power line and all auxiliary electrical protection

devices per local code requirements and as indi-

cated necessary by the chiller manufacturer.

3. Contractor shall supply and install electrical

wiring and devices required to interface the chiller

controls with the building controls system if

applicable.

H. Piping Requirements:

1. Piping and instrumentation for the chilled water,

cooling water, steam, and condensate piping (or

hot water supply and return piping) shall be sup-

plied and installed by the contractor/owner.

2. Absorber-condenser crossover piping shall be fur-

nished by the contractor/owner or the chiller

manufacturer as speciﬁed on the equipment

schedule.

3. Chilled water and condenser water ﬂow switch

shall be ﬁeld installed and supplied by either the

chiller manufacturer or the contractor/owner.

4. Piping from the rupture disk shall be provided

and installed by the contractor/owner and piped

in accordance with the chiller manufacturer’s

written instructions and any local jurisdictional

requirements.

1 2 ... 22 23 24 25 26 27 28

Commentaires sur ces manuels

Pas de commentaire

Carrier 16JB Manuel d'utilisateur Page 27

Commentaires sur ces manuels

Produits connexes et manuels pour Non Carrier 16JB