Assessments - 2, GPA: 4.5 ( )

Fabricante : Carrier Arquivo Tamanho: 272.76 kb Arquivo Nome : Língua de Ensino:

If it reads 24 vac, replace the Apollo control. If it reads 0 to 2 vac, check the C1 contactor and the unit transformer. The Control Will Not Energize Second Stage Cooling 1. The thermostat is not displaying the second stage indicator. A decimal point on the thermostat display screen is the indication that the thermostat is asking for second stage. a. Check to see if the space demand is equal to or greater than 2° F. The control must see a 2° F demand before it will call for second stage. b. Check the Temperature Trend Staging option. If this option is configured to “on” and space conditions are improving, the control will not energize the second stage. 2. The thermostat is displaying the decimal point. a. Check to see if the C2 LED is lit on the Apollo control. If it is not lit, replace the Apollo control. b. The LED is lit, but second stage is not energized. Check the voltage across the C2 relay contact. If it reads 24 vac, replace the relay board. If it reads 0 to 2 vac, check the C2 contactor and the unit transformer. The Control Will Not Energize The Fan 1. The fan indicator is not lit on the thermostat. a. The Fan switch is in the AUTO. position and the control is not in a mode (HEAT or COOL position). b. The fan switch is in the ON position but the thermostat is in setback and has no mode. c. The thermostat has just received power or has just reset and is going through its initialization process. 2. The fan indicator is lit on the thermostat. a. Check the fan LED on the Apollo control. If it is not lit, replace the Apollo control. b. If the fan LED is lit, check the voltage across the fan relay contact. If it reads 24-vac, replace the relay board. If it reads 0 to 2 vac, check the fan contactor and the unit transformer. 5 Fig. 7 — Factory-Supplied Wiring to Rooftop Unit and Apollo Control LEGEND COM — Communication ECONO — Economizer NC — Normally Closed Fig. 7 — Factory-Supplied Wiring to Rooftop Unit and Apollo Control LEGEND COM — Communication ECONO — Economizer NC — Normally Closed *Filter status switch and humidity sensor cannot function simultaneously. Only one sensor can be wired. LEGEND C — Contactor CHAS — Ground COM — Common DX — Direct Expansion ECON — Economizer GND — Ground HT — Heat IAQ — Indoor Air Quality NC — Normally Closed NO — Normally Open OAT — Outdoor-Air Thermostat SAT — Saturated-Air Temperature Factory Wiring Field Wiring Fig. 8 — Apollo Control Wiring Schematic — 48/50HJ, 3 to 20 Ton Units; 48/50TF,TM, 3 to 12-1/2 Ton Units; 48/50TJ,TM, 15 to 25 Ton Units; 50HJQ/TFQ, 3 to 10 Ton Units 6 *Filter status switch and humidity sensor cannot function simultaneously. Only one sensor can be wired. LEGEND C— Contactor IAQ — Indoor Air Quality CHAS — Ground NC — Normally Closed COM — Common NO — Normally Open DX — Direct Expansion OAT — Outdoor-Air Thermostat ECON — Economizer SAT — Saturated-Air Temperature GND — Ground Factory Wiring HT — Heat Field Wiring Fig. 9 — Apollo Control Wiring Schematic — 50HJQ, 121/2 and 15 Ton Units 7 GROUNDTRAN24 VAC20 VA(FIELDSUPPLIED)24 V H G 24 VACOR + - 24 VDC 2 1 8 7 6 5 4 3 2 1 ++- 2-10VDCSIG COM (J5-3)4-20mA (J5-2) NCCOMNO A...

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