System Operation, Testing and Maintenance

Replacing the Humidifier Canister

!

CAUTION

Risk of contact with extremely hot surfaces. Can cause injury.

Canister and steam hose may be hot. Do not attempt to replace parts until the humidifier has cooled down to a temperature that is safe for human contact. Use extreme caution and wear thermally insulated gloves and arm protection when replacing the humidifier canister.

The proper procedure to replace the humidifier canister is:

1. Turn off the humidifier by lowering the humidity setpoint below the ambient humidity level.

Record the original setpoint.

2. Place the RUN/DRAIN switch in the DRAIN position to drain the water from the canister.

3. Return the RUN/DRAIN switch to the RUN position after the canister has drained.

4. Turn OFF the power at the main unit.

5. Remove the cover from the humidifier cabinet.

6. Locate the power wires to the steam canister. They are connected to the canister with 1/4" quick connects. Make note of the wiring configuration before removing any wires. Refer to schematic on unit. Slide the rubber boot back to expose the connections. Remove the two (2) power wires and the canister-full wire. Do not loosen the screws that secure the electrodes.

7. Loosen the steam outlet hose clamps and slide the steam hose away from the canister fitting.

Release the canister clamp along the base of the canister.

8. Remove the canister.

9. Reverse previous steps to re-assemble humidifier, paying special attention to the following:

• When replacing the wiring, connect the red wire from terminal #1 on the interface to the red tip terminal on the canister. Reconnect the power wires as before (#2 on the left and #1 on the right)

• When replacing the canister, always check the fill and drain solenoids for proper operation.

9.3.4 Humidifier Circuit Board Adjustments

!

WARNING

Risk of electric shock. Can cause injury or death.

Open all local and remote electric power disconnect switches before working on the humidifier printed circuit board.

Verify that electric power is Off with a voltmeter prior to the procedure.

The humidifier control board governs humidifier operation. There are three potentiometers mounted on the board and can be used to adjust for extreme water conductivity conditions.

POT2 controls the amperage at which the drain will energize and is clearly marked in percentages.

This adjustment is factory-set at 85%, which indicates that the unit will drain when the amperage falls off to 85% of the capacity set point. Raising the value increases the frequency of drain cycles.

Lowering the value decreases the frequency of drain cycles.

The frequency should be increased for highly conductive water and decreased for less conductive water. If adjustment is necessary and a change of three to four percent in either direction does not permit normal operation of the unit, consult your Liebert supplier.

The POT1 controls the duration of the drain cycle. This adjustment is factory-set at 60 seconds

(1 VDC) and should not be readjusted without consulting your Liebert supplier.

The DIP switch settings are used to set the capacity of the humidifier. If the humidifier is replaced in the field the DIP switches should be set to the required settings described below.

Table 24 Humidifier control board DIP switch settings

Voltage SW1 SW2 SW3 SW4 Amps

208

240

380/415

460

575

On

Off

Off

On

On

On

On

Off

On

On

On

On

Off

Off

Off

Off

On Off

Off Off

8.9

8.5

5.2

4.5

3.4

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Maintenance Inspection Checklist

10.0 M

AINTENANCE

I

NSPECTION

C

HECKLIST

Liebert Mini-Mate2

Date:____________________________________

Model #:_________________________________

Prepared By:____________________________________

Serial Number:__________________________________

NOTE

Reheat element sheaths and fins are manufactured with stainless steel. Regular inspections are necessary to assure proper cleanliness of the reheating element. Should inspection reveal corrosion particles on the reheating element or adjoining surfaces (including ducts and plenums), appropriate cleaning should be performed. Periodic reheating element replacement may be required to meet specific application requirements.

Monthly

Filters

___ 1. Check for restricted airflow

___ 2. Check for filter

___ 3. Wipe section clean

Fan Section

___ 1. Impellers free of debris and move freely

___ 2. Bearings in good condition

___ 3. Check belt tension and condition

Semiannually

Compressor Section

___ 1. Signs of oil leaks

___ 2. Vibration isolation

Refrigeration Cycle

___ 1. Suction pressure

___ 2. Head pressure

___ 3. Superheat

___ 4. Evaporator coil clean

___ 5. Insulation intact

Air-Cooled Condensing Unit (if applicable)

___ 1. Condenser coil clean

___ 2. Motor mount tight

___ 3. Refrigerant lines properly supported

Humidifier

___ 1. Check canister for mineral deposits

___ 2. Check condition of electrodes

___ 3. All hoses and fittings tight

___ 4. Check water make-up valve for leaks

Drain lines

___ 1. Check for obstructions and sediment buildup.

___ 2. Check for damage and/or corrosion.

___ 3. Check for leaks

Flood Back Head Pressure Control

___ 1. Check refrigerant level

Water- or Glycol-Cooled Condensing Unit

___ 1. Water valve adjustment

___ 2. Water flow

___ 3. Water leaks

Glycol Pump (if applicable)

___ 1. Glycol leaks

___ 2. Pump operation

___ 3. Glycol solution

___ 4. pH level

Electric Panel

___ 1. Check electrical connections

___ 2. Operational sequence

Electric Reheat

1. Check element for corrosion

Signature:________________________________________________________________

Make photocopies of this form for your records

63 Liebert

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Mini-Mate2

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Troubleshooting

11.0 T

ROUBLESHOOTING

Table 25 Troubleshooting

Symptom

Unit will not start

No cooling

Compressor high head pressure

Humidifier does not operate

Reheat will not operate

Possible Cause Check Or Remedy

No power to unit

Control voltage circuit breaker (at transformer) open

Float switch relay closed because of high water in the condensate pan

Jumper not in place

Check voltage at input terminal block.

Locate short and reset circuit breaker.

Cooling not displayed at the control panel

Adjust TEMP control set point and sensitivity to require cooling.

Short cycle prevention control

Compressor contactor not pulling in

Control software delays compressor 3 minutes cooling, from stop to start

Check for 24 VAC ± 2 VAC at terminals P4-8 and P4-4. If voltage, check contactor. If no voltage at P4-8 and P4-4, check at terminals P2-3 and P2-8. If voltage, check freeze stat.

Compressor high head pressure See below for cause.

Plugged filter/dryer

Low refrigerant charge

Has rubber band been removed from float switch? Check drain and line. Access through left panel. Power must be cycled at the disconnect to reset.

Check terminal TB1-4 and TB1-5 for jumper or N/C contact.

Check pins 1-8 and 1-9 for jumper or N/C high temperature sensor contact. Check pins 5-4 and 5-5 for jumper or N/C smoke sensor contact.

Replace filter/dryer

Check pressure gauges. At low ambient temperatures, proper refrigerant charge is very important on units with Lee-Temp receivers.

Insufficient air flow across condenser coil

Water/Glycol Cooled only: No fluid flowing through condenser

Condenser fan not operating

DIP switch not set to enable humidifier option

“HUMIDIFY” not displayed at control panel

Remove debris from coil and air inlets.

Check fluid supply to regulating valve. Adjust valve if necessary.

Check fan operation.

See DIP switch settings Table 24.

Defective board

Failed humidity sensor

No water flow

Increase humidity control humidification. set point and sensitivity to require

Check voltage at P3-1 and P1-9 on interface board for 24 VAC

± 2 VAC. If no voltage, check wiring and/or replace board. Check wiring from control panel to board.

Humidity display will indicate dashes. Check wiring from temperature/humidity board to the control board and from the wall box to the control board. Replace wallbox or temperature/humidity circuit board (if remote).

Make sure switch is in Run position. Check humidifier water supply (including filter screen) and check nylon overflow line if canister is full.

Check fill valve screen opening and capillary tube for obstructions. Check water supply pressure (minimum 10 PSIG).

Canister fill rate is not keeping up with the steam output

DIP switch not set to enable reheat option

HEAT not displayed at the control panel

See DIP switch settings Table 24.

Increase temperature set point to require heating.

Reheat safety open, defective reheat contact or defective board

Element is burned out

Check voltage at P2-1 and P1-9 on interface board for 24 VAC ±

2 VAC. If voltage, check reheat contactor and reheat safety. If no voltage, check wiring and/or replace board.

Turn off power. Check element continuity with an Ohmmeter.

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Troubleshooting

Table 25 Troubleshooting

Symptom

Cooling cycle too short

Possible Cause Check Or Remedy

Sensor response delay too short

Increase sensor response delay. See 6.11 - Calibrate Sensors.

Display freezes and control pads do not respond

Static discharge

During period of low humidity, static electricity can cause the control program to freeze or display incorrect information.

Although this is unlikely, the control can be reset by cycling power from the disconnect switch.

Condensate pump does not operate

Open or short circuit in wiring Find open or short circuit and repair power to pump.

Continuous

Cooling

Failed temperature sensor

Temperature display will indicate dashes. Check wiring from temperature/humidity board (remote sensors) to the control board or from control board to wallbox. Replace temperature/humidity circuit board (remote sensors) or wallbox.

Continuous

Heating

Dehumidification

Humidification

Shorted wiring or failed control board

Check wiring and/or replace control board.

Display Problem Incorrect wiring

Review 5.4.4 - Electrical Connections. Verify VDC between 5

to 6 Volts at TB-3 Pin 1 (Ground) and TB-3 Pin 2 of the control board and wall box. If the transmit lines (TB-3 Pin 3 & 4) are not connected, only the POWER LED will be lit. It will flash once every 10-12 sec. If T- is connected, but not T+, TX1 will flash approximately every 2-3 sec. And the POWER LED will flash once every 10-12 sec. If T+ and T- are reversed, the POWER

LED and RX1 Will be lit and flash every 10-12 sec.

NOTE: Erratic operation of the unit could occur. If no LED is lit, there is no power or the +5VDC polarity is reversed. If any of these conditions occur, remove power from the evaporator using the disconnect switch, and correct wiring from the control board to the wall box.

NOTE: It may take up to 20 seconds for the display to appear on the wall box LCD after power is applied.

65 Liebert

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Mini-Mate2

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Ensuring The High Availability

Of Mission-Critical Data And Applications.

Emerson Network Power, a business of Emerson (NYSE:EMR), is the global leader in enabling Business-Critical Continuity

™

from grid to chip for telecommunication networks, data centers, health care and industrial facilities. Emerson Network Power provides innovative solutions and expertise in areas including

AC and DC power and precision cooling systems, embedded computing and power, integrated racks and enclosures, power switching and controls, infrastructure management, and connectivity. All solutions are supported globally by local

Emerson Network Power service technicians. Liebert AC power, precision cooling and monitoring products and services from Emerson Network Power deliver Efficiency Without

Compromise

™

by helping customers optimize their data center

infrastructure to reduce costs and deliver high availability.

While every precaution has been taken to ensure the accuracy and completeness of this literature, Liebert Corporation assumes no responsibility and disclaims all liability for damages resulting from use of this information or for any errors or omissions.

© 2009 Liebert Corporation

All rights reserved throughout the world. Specifications subject to change without notice.

® Liebert is a registered trademark of Liebert Corporation.

All names referred to are trademarks or registered trademarks of their respective owners.

SL-10532_REV3_02-13

Emerson Network Power.

The global leader in enabling Business-Critical Continuity ™

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