CeilAir CW series Manuel de l'opérateur télécharger pdf (Page 38)

(©July, 2008)

CeilAiR OHS Series Installation, Operation & Maintenance Manual

ir Technology Systems, Inc.

3.0 Start-Up / Commissioning

3.1 Operation

For new installations, ensure the unit is ready to

operate by going through the completed installation

checklist provided with the unit, prior to start-up.

NOTE

Warranty Registration and Start-Up Checklist

should be completed during start-up and sent to

SATS. This checklist should be used as a guide-

line for items that need to be checked during

start-up.

Start-up must be performed by a journeyman, refrig-

eration mechanic or an air conditioning technician.

3.2 Step by Step Start-Up Instructions

CAUTION

For air-cooled outdoor condensers, apply power

to condenser eight hours before operating sys-

tem. This time is required to allow liquid refrig-

erant to be driven out of the compressor. The

compressor crank case heater is energized as

long as power is applied to the unit.

1. Replace all equipment, access panels and ceiling

panels removed prior to performing start-up

checks.

2. Apply power to start the

CeilAiR

OHS system at

the service disconnect switch, then turn the A/C

system on at the controller.

NOTE

The compressor may have a time delay on start-up.

3. Ensure that all blowers and fans are rotating freely

and without any unusual noise.

Water/Glycol-cooled units have a head pressure

water regulating valve that has been factory set.

A valve adjustment may be required based on

water temperatures or water/glycol flow condi-

tions at your site. (Refer to System Settings and

Adjustments.)

If you have selected a dual circuit unit, both re-

frigeration circuits must be tested at start-up.

There are several ways to force the second cir-

cuit into operation. If a microprocessor control-

ler was purchased it allows the unit to be placed

in a manual mode, refer to the separate Control-

ler Operations Manual sent with your unit.

4. Test cooling operation by setting the temperature

setpoint below the actual room temperature. The

compressor should come on and the discharge air

should feel cooler than the return air.

5. Test heating operation by setting the temperature

setpoint above the actual room temperature. The

source of heat should be energized to increase

discharge air temperature.

6. Test humidification operation by creating a

demand for humidification. Use an amp meter to

determine current draw of the humidifier. Visually

check for vapor leaving the steam head or feel if

the cylinder is warm to verify if the humidifier is

operational. In all cases, 1 to 6 hours might be

required to see a desired level or rise in humidity

in the conditioned space. Once room conditions

have been programmed or set, a repeat visit to the

conditioned space may be required to ensure the

humidifier is meeting the room’s requirements.

7. Test dehumidification operation by creating a

demand for dehumidification. If necessary, set the

dehumidification setpoint 10% below actual room

conditions, (the set point may already be below

actual room conditions, especially at start-up).

The chilled water valve should open to begin the

dehumidification process. While in this mode,

room temperature may decrease and the reheat

function may activate. As conditions in the room

change, you may have to readjust the setpoint as

you check operation. An adequate heat load

within the space is required.

8. For Electric Reheat, use an amp meter on the

heater circuit to determine if the heater is opera-

tional. For Hot Water Reheat, ensure the control

signal has energized the control valve and the

temperature of the water has decreased as it

passes through the unit. In all cases, 1 to 6 hours

might be required to see a desired level or

decrease in humidity in the conditioned space.

Once room conditions have been programmed or

set, a repeat visit to the conditioned space may

be required to ensure the dehumidification mode

is meeting the room’s requirements

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CeilAir CW series Manuel de l'opérateur Page 38

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