Carrier 50PG03-07 Specifikace stáhnout pdf (Strana 46)

Table 21 -- Heating Service Analysis

PROBLEM

No Heat.

CAUSE

Power failure.

Fuse blown or circuit breaker tripped.

Thermostat not calling for heating.

No 24 vac at primary contactor.

No power (high voltage) to L2 of

primary contactor.

Bad electrical elements.

REMEDY

Call power company.

Replace fuse or reset circuit breaker.

Check thermostat.

Check transformer and circuit breaker.

Check safety switches, one shot backup,

and auto limit.

With power off, remove high voltage wires and

check resistance of heater. Replace if open.

EconoMi$er IV Troubleshooting

ECONOMISER IV PREPARATION -- This procedure is

used to prepare the EconoMi$er IV for troubleshooting. No

troubleshooting or testing is done by performing the following

procedme.

NOTE: This procedure requires a 9-v battely, 1.2 kilo-ohm

resistok and a 5.6 kilo-ohln resistor which are not supplied

with the EconoMiSer IV.

IMPORTANT: Be sure to record file positions of all poten- ]

tiometers before starting troubleshooting.

1. Disconnect power at TR and TRI. All LEDs should be

off. Exhaust fan contacts should be open.

2. Disconnect device at P and PI.

3. Jumper P to PI.

4. Disconnect wires at T and TI. Place 5.6 kilo-ohm resistor

across T and TI.

5. Jumper TR to 1.

6. Jumper TR to N.

7. If connected, remove sensor from termimds So and +.

Connect 1.2 kilo-ohm 4074EJM checkout resistor across

terminals So and +.

8. Put 620-ohm resistor across terminals SR and +.

9. Set minimum position, DCV set point, and exhaust

potentiometers fully CCW (counterclockwise).

10. Set DCV maximum position potentiometer fully CW

(clockwise).

11. Set enthalpy potentiometer to D.

12. Apply power (24 vac) to terminals TR and TRI.

DIFFERENTIAL ENTHALPY-- To check differential

enthalpy:

1. Make sure EconoMiSer IV preparation procedure has

been performed.

2. Place 620-ohm resistor across So and +.

3. Place 1.2 kilo-ohln resistor across SR and +. The Free

Cool LED should be lit.

4. Remove 620-ohm resistor across So and +. The Free

Cool LED should turn off.

5. Return EconoMiSer IV settings and wiring to normal

after completing troubleshooting.

SINGLE ENTHALPY -- To check single enthalpy:

1. Make sure EconoMiSer IV preparation procedure has

been performed.

2. Set the enthalpy potentiometer to A (fully CCW). The

Free Cool LED should be lit.

3. Set the enthalpy potentiometer to D (fully CW). The Free

Cool LED should turn off.

4. Return EconoMiSer [V settings and wiring to normal

after completing troubleshooting.

DCV (Demand Controlled Ventilation) AND POWER

EXHAUST -- To check DCV and Power Exhaust:

1. Make sure EconoMi$er IV prepmation procedure has

been performed.

2. Ensure terminals AQ and AQI are open. The LED for

both DCV and Exhaust should be off. The actuator

should be fully closed.

3. Connect a 9-v battery to AQ (positive node) and AQI

(negative node). The LED for both DCV and Exhaust

should turn on. The actuator should &ive to between 90

and 95% open.

4. Turn the Exhaust potentiometer CW until the Exhaust

LED turns off. The LED should turn off when the poten-

tiometer is approximately 90%. The actuator should

remain in position.

5. Turn the DCV set point potentiometer CW until the DCV

LED turns off. The DCV LED should turn off when the

potentiometer is approximately 9V. The actuator should

drive fully closed.

6. Turn the DCV and Exhaust potentiometers CCW until

the Exhaust LED turns on. The exhaust contacts will

close 30 to 120 seconds after the Exhaust LED turns on.

7. Return EconoMi$er IV settings and wiring to normal

after completing troubleshooting.

DCV MINIMUM AND MAXIMUM POSITION -- To check

the DCV minimum and maximum position:

1. Make sure EconoMi$er IV prepmation procedure has

been performed.

2. Connect a 9-v battery to AQ (positive node) and AQI

(negative node). The DCV LED should turn on. The

actuator should drive to between 90 and 95% open.

3. Turn the DCV Maximum Position potentiometer to mid-

point. The actuator should drive to between 20 and 80%

open.

4. Turn the DCV Maximum Position potentiometer to lidly

CCW. The actuator should drive fully closed.

5. Turn the Minimum Position potentiometer to midpoint.

The actuator should drive to between 20 and 80% open.

6. Turn the Minimum Position Potentiometer lidly CW. The

actuator should drive fully open.

7. Remove the jumper from TR and N. The actuator should

drive fully closed.

8. Return EconoMiSer [V settings and wiring to norm_fl

after completing troubleshooting.

M[XED AIR [NPUT -- To check mixed air input:

1. Make sure EconoMiSer IV prepmation procedure has

been performed.

2. Set the Enthalpy potentiometer to A. The Free Cool LED

turns on. The actuator should drive to between 20 and

80% open.

3. Remove the 5.6 kilo-ohln lesistor and jumper T to TI.

The actuator should drive lidly open.

1 2 ... 41 42 43 44 45 46 47 48 49

Komentáře k této Příručce

Žádné komentáře

Carrier 50PG03-07 Specifikace Strana 46

Komentáře k této Příručce

Související produkty a manuály pro ne Carrier 50PG03-07