Carrier 42C,V Installationshandbuch PDF herunterladen (Seite 78)

The ECM blower is controlled by one of three control

boards, depending on the options ordered with the unit.

Review project submittals or order acknowledgement to

determine which ECM control scheme the unit has. Alter-

natively, match the control board to the illustrations iden-

tified in the Control Board Type section.

8. Check the fan and motor operation.

9. Be sure drain line is properly and securely positioned and

that the line is clear. Pour water into drain to check

operation.

10. Prior to the water system start-up and balancing, the

chilled/hot water systems should be flushed to clean out

dirt and debris which may have collected in the piping

during construction. During this procedure, the system

should be flushed from the supply riser to the return riser

through a cross-over loop at the end of the riser column,

and all unit service valves must be in the closed position.

This prevents foreign matter from entering the unit and

clogging the valves and metering devices. Strainers

should be installed in the piping mains to prevent this ma-

terial from entering the units during normal operation.

Vent all air from unit coil and related piping. Air venting

from the unit is accomplished by the use of the standard

manual air vent fitting, or the optional automatic air vent

fitting installed on the coil. Venting can be accomplished

by depressing the needle valve core. Automatic air vents

may be unscrewed one turn counterclockwise to speed

initial venting, but should be screwed in for automatic

venting after start-up operations. When steady steam of

water begins to escape, close valve. Vent release air slow-

ly, usually dripping water into drain pan in the process.

Make sure all service valves are open and that the motor-

ized control valves, if supplied, are set for automatic

operation.

11. Check all control valves in the system for proper opera-

tion in accordance with valve manufacturer's instructions.

12. For units with factory-installed ball valves with lever han-

dles — When handle is perpendicular to valve body, there

is no flow through valve. Ball valves may be used as

shutoff valves.

ECM CONTROL OPTION

3-Speed Jumper Field Adjustment (42SM Only) (See

Fig. 95) — The unit has been factory configured to produce

PSC equivalent airflow on high speed, with medium and low

speed set at 80% and 60% of high, respectively. If these setting

are acceptable, then no further configuring is required.

To adjust airflow, relocate board mounted jumpers as indi-

cated on configuration chart. Chart is located on control box

cover.

3-Discrete Speed Rheostat Field Adjustment (42SM Only)

(See Fig. 96)— The unit has been factory configured to pro-

duce PSC equivalent airflow on high speed, with medium and

low speed set at 80% and 60% of high, respectively. If these

setting are acceptable, then no further configuring is required.

Board mounted rheostats are provided to adjust the airflow per-

taining to each output. Each output can be adjusted from 0 to

100% of the motor’s factory programmed operating range. To

set airflow, connect a volt-meter between “common” (near the

red status LED) and Flo1 through Flo4.

Carrier’s convention is to preset and wire Flo1 for high

speed, Flo2 for medium, and Flo3 for low. Flo4 is not used

with any standard thermostat, but may be employed for a more

advanced application. The chart on the control box cover asso-

ciates airflow rates with the voltage indicated on your volt-me-

ter. For each speed, adjust the rheostat until indicated voltage

matches the desired value from the airflow table.

If a factory provided thermostat or DDC (Direct Digital

Controls) controller is utilized, then the unit is already correctly

configured. A field furnished thermostat or control may require

adjustment of board jumpers.

CAUTION

The air vent provided on the unit is not intended to replace

the main system air vents and may not release air trapped

in other parts of the system. Inspect the entire system for

potential air traps and vent those areas as required, inde-

pendently. In addition, some systems may require repeated

venting over a period of time to properly eliminate air from

the system. Failure to properly vent system may negatively

affect operation.

CAUTION

Both of the procedures described below require the control

box to be powered while adjustments are made. Line volt-

age components are concealed behind a secondary cover.

However, installer should still take all reasonable precau-

tions to prevent electrical shock.

MED

SPEED

W/W1

EM/W2

BK/

PWM

OUT

LOW

SPEED

ADJUST HIGH

SPEED

Y/Y2

C/B

D11

D10

–

Fig. 95 — ECM Jumper Speed Board (42SM Only)

A42-4310

Flo0

Com

Status

Rp1

Flo1

Rp2

Flo2

Rp3

Flo3

Rp4

Flo4

Rp5

COMMON FLO1 FLO2 FLO3 FLO4

Fig. 96 — ECM Rheostat Speed Board (42SM Only)

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 87 88

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