Reznor R6GN Unit Installation Manual - Manual (Page 19)

19
uNIt MaINtENaNcE
oPERatING SEQuENcE
The operating sequences for the heating, cooling, and
fan modes are described below. Refer to the wiring
diagrams (Figures 15 & 16, pages 30 & 31).
Cooling Mode
1. On a call for cooling the thermostat closes, applying 24
VAC to Y1, G, & Y2 if Stage 2 cooling is calling.
2. G applies 24VAC to the main circulating blower circuit.
3. Y1 & Y2 apply 24VAC through all safety switches before
energizing their respective contactors.
4. When the thermostat is satisfied the contactors are
de-energized.
5. The circulating blower motor de-energizes immediately.
Blower Mode
1. On a call for fan operation, the thermostat applies 24
VAC directly to the blower contactor.
2. The circulating blower is energized immediately.
Heating Mode
1. On a call for heat, the thermostat closes, applying 24
VAC to the W1 terminal (and W2 terminal if Stage 2
heat is required).
2. The integrated control monitors the safety circuit at all
times. If either the roll-out switch or the over-temperature
limit controls open, the gas valve will not energize.
The main blower continues to operate until the over-
temperature limits close, the flame roll-out switch is
manually reset, or the thermostat is satisfied.
3. The integrated control checks all safety switches at
the beginning of each heating cycle. If closed, the
combustion blower performs a 15 second pre-purge.
4. The integrated control will then supply power to the
direct spark ignitor and immediately energizes the gas
valve.
NotE: Burner operation begins in high fire mode
with both Stage 1 and Stage 2 gas valve energized,
independent of the thermostat call for Stage 2 heat. If
after 30 seconds of operation with no call for Stage 2
heat, the integrated control will resume heating operation
in low fire mode of operation and Stage 2 gas valve is
de-energized.
5. The flame must be proven through the flame sensor in
7 seconds to hold the gas valve open. The integrated
control will monitor the gas flame with the flame sensor
for the entire time the gas valve is open. If for any reason
the gas flame drops out, the gas valve will immediately
close. After 30 second purge, the integrated control will
try to ignite 14 more times.
6. The main air blower will start and continue to run 40
seconds after the gas valve opens.
7. When the thermostat is satisfied, the integrated
control is de-energized. The gas valve and combustion
blower de-energize immediately while the main air
blower continues to run through the blower off delay
of approximately 150 seconds.
8. If the unit fails to prove flame after fifteen ignition
attempts, it will go into a soft lockout. The unit will re-
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HaZaRD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical
power to furnace.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.”
WaRNING:
RISQUE DE CHOC ÉLECTRIQUE, D’INCENDIE
OU D’EXPLOSION
Le non-respect des avertissements de sécurité
pourrait entraîner un fonctionnement dangereux
de l’appareil, des blessures graves, la mort ou
des dommages matériels.
Un entretein incorrect pourrait entraîner un
fonctionnement dangereux de l’appareil, des
blessures graves, la mort ou des dommages
matériels
• Couper toute alimentation électrique au
générateur d’air chaud avant de prodéder
aux travaux d’entretein.
• Au moment de l’entretien des commandes,
étiquetez tous les fils avant de les débrancher.
S’assurer de les raccorder correctement.
• S’assurer que l’appareil fonctionne
adéquatement aprés l’entretien.
aVERtISSEMENt:
NotE: These maintenance instructions are primarily
intended to assist qualified technicians experienced in
the proper maintenance and operation of this appliance.
To achieve optimum performance from the air conditioner
and minimize equipment failure, it is recommended that
annual maintenance be performed on this unit. The ability to
properly perform maintenance on this equipment requires
certain mechanical skills and tools.
attempt the start-up procedure every hour until the
thermostat is satisfied or 24 VAC power is removed
from the unit for a minimum period of 5 seconds.
NotE: For a complete list of heating operation fault
codes, see Troubleshooting (page 22) or Figure 15
(pg 30)