Reznor PDF2SF Unit Installation Manual - Manual (Page 22)

22
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:
EQUIPMENT MAINTENANCE the first 15 seconds of any heating cycle and ignores
any second stage heat demand. After this 15 second
period, the control switches inducer to Low speed if no
second stage demand is present, or attempts to stage
to high heat if thermostat W2 terminal is energized.
8. Blower Start-Up - After flame is proven, the furnace
control energizes the circulating air blower at a very
low speed. After 30 seconds, the blower will ramp to
the airflow selected for heating.
9. High Heat Staging (with 2 Stage Heat Thermostat) - Unit
will always start in low heat operation. See step 7 for
start up sequence. After the initial 15 second start up
sequence is satisfied, the control will wait for a W2 call
from a 2-stage thermostat. After a second stage heat
demand is present (W2 energized), the gas valve will
open to High heat mode increasing the flow of gas to
the burners while the inducer and blower motor ramp
to high speed.
10. When the thermostat has been satisfied, gas valve is
de-energized.
11. The inducer motor is de-energized after a 30 second
post purge.
12. The circulating air blower will remain energized for
approximately 120-150 seconds after the demand for
heat is no longer present.
13. Abnormal Conditions - If a limit switch opens during
heating operation the gas valve is de-energized
immediately. The control de-energizes the induced
draft motor and runs the indoor blower motor
continuously while the limit switch is open.
2-Stage Cooling Mode
1. On a call for cooling the thermostat closes, applying
24 VAC to the G, O and Y1 terminals on the control.
This closes the compressor contactor, energizes the
reversing valve, and the compressor operates on 1st
stage.
2. The control energizes the circulating blower to 1/3 of
the selected airflow for approximately 30 seconds.
3. The circulating blower will then ramp to approximately
3/4 of the selected airflow for another 30 seconds before
adjusting to full airflow until the thermostat is satisfied.
4. If the thermostat is not satisfied in the required time,
based on the operation of the two-stage cooling
thermostat, Y2 will energize and the compressor will
run at second stage. Refer to the thermostat installation
instructions for the cooling profile.
5. When the thermostat is satisfied, the G, O and Y
terminals on the control board are de-energized
opening the compressor contactor, and de-energizing
the reversing valve.
6. The circulating air blower will operate at 1/2 of the
selected speed for 60 seconds, and de-energize.
Fan Mode
1. On a call for fan operation, the thermostat applies 24
VAC to the G terminal on the furnace control board.
2. The circulating air blower ramps to 1/2 of the selected
airflow.
CAUTION:
Use care when removing parts from this unit.
Personal injury can result from sharp metal
edges present in all equipment of sheet metal
construction.
Proper maintenance is important to achieve optimum
performance from the system. The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance. Consult your
local dealer about the availability of maintenance contracts.
Routine maintenance should include the following: