Carrier 50FK - Manual (Page 33)

Table 16 — Quick Test, Thermistor and Potentiometer Check
QUICK
TEST
STEP NO.
NORMAL
DISPLAY
DESCRIPTION
THERMISTOR OR
POTENTIOMETER*
1.4. 1
1 — Thermistor OK
0 — Thermistor Faulty Supply Air
Thermistor (T1)
1.5. 1
1 — Thermistor OK
0 — Thermistor Faulty Return Air
Thermistor (T2)
1.6. 1
1 — Thermistor OK
0 — Thermistor Faulty Circuit 1 Condenser Thermistor
(T3)
1.7. 1
1 — Thermistor OK
0 — Thermistor Faulty Circuit 2 Condenser Thermistor
(T4)
1.8. 1
1 — Thermistor or Potentiometer OK
0 — Thermistor or Potentiometer Faulty or
Option not used
Accessory Space Temperature Thermistor (T10)
or Accessory Reset Potentiometer (P7)
1.9. 1
1 — Potentiometer OK
0 — Potentiometer Faulty Supply-Air Set Point
Potentiometer (P1)
2.0. 1
1 — Potentiometer OK
0 — Potentiometer Faulty or Option not used Accessory Reset Limit
Potentiometer (P3)
2.1. 1
1 — Potentiometer OK
0 — Potentiometer Faulty or Option not used Accessory Demand Limit
Potentiometer (P4)
2.2. 1
1 — Potentiometer OK
0 — Potentiometer Faulty or Option not used
Minimum Position
Economizer
Potentiometer (P5)
2.3. 1
1 — Potentiometer OK
0 — Potentiometer Faulty or Option not used Warm-Up Set Point
Potentiometer (P6)
*Potentiometer P2 is not listed since it is not part of the quick test. If on unit start-up a Code 83 is displayed, check potentiometer P2.
Table 17 — Quick Test, Output Relay Check
QUICK
TEST
STEP NO.
NORMAL
DISPLAY
DESCRIPTION RELAY NUMBER
2.4. 1
1 — Open Economizer or Open Relay if no Economizer K7
2.5. 1
1 — Close Economizer or Close Relay if no Economizer K8
2.6. 1 1 — Energize Fan Relay and Heat Relay K9* and K10
2.7. 1
Energize Stage 1 Condenser Fan(s) K11
2.8. 1
Energize Stage 2 Condenser Fan(s) K12
2.9. 0 then 1 then 0
Energize Compressor 1† K1
3.0. 0
Energize Unloader 2; Not Used (044, 104) K2
3.1. 0
Energize Unloader 1 K3
3.2. 0 then 1 then 0 Energize Compressor 2† K5
3.3. 0
Not Used K6
LEGEND
CR — Control Relay
*K9 (fan relay) will remain on for duration of quick test.
†Compressor will be energized for 10 seconds. Zero indicates open CR; 1 indicates closed CR.
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