Field Controls Power Venter System PVU-300 - Manual (Page 10)

Page 10
SYSTEM CONTROL CHECK PROCEDURES
1. Adjust the thermostat to call for heat and observe the power venting system for proper operation sequence. Repeat as
necessary.
a. Thermostat calls for heat.
b. Venter relay is energized which starts venter motor.
c. Pressure switch closes which allows burner to fire.
d. Thermostat is satisfied, burner stops operation.
e. Venter continues to operate for up to 2 minutes during the post purge cycle.
2. While the system is in operation, disconnect the draft tube from the air pressure switch. The pressure switch should
open and interrupt burner operation. Re-connect the draft tube to the air pressure switch, which should allow the
burner re-light.
3. If a GSK-3 secondary safety switch is installed, allow the vent pipe to cool and disconnect the vent pipe between the
appliance outlet and venter inlet. Block the vent connected to the appliance with a non-combustible material. Activate
the heating system main burner and verify that the GSK-3 shuts down the burner within a few minutes or less. Reset
the GSK-3 and repeat.
TROUBLESHOOTING TIPS
1. Burner does not fire when thermostat calls for heat.
a. Make sure draft tube is securely fastened to the air pressure switch, and is not blocked.
b. Check for continuity across pressure switch terminals when venter is operating.
c. Check wiring connections between air pressure switch, appliance, relay, yellow mode wire connection
and PVU control board.
d. Relay should “click” when pressure switch closes.
2. Venter does not activate when thermostat calls for heat.
a. Check to see if relay closes when thermostat calls for heat.
b. Check wiring connections, including yellow mode wire connection.
c. Check motor for unrestricted shaft rotation.
3. Exhaust gas odor.
a. Check system draft level during operation.
b. Check vent system on outlet side of venter for leakage.
c. Check for negative pressure in building.
MAINTENANCE
1. Motor: Inspect the motor once a year - motor should rotate freely. The PVU’s motor has sealed ball bearings,
therefore, should not need oiling.
2. Blower Wheel: Inspect the blower wheel annually to clear any soot, ash or coating, which inhibits either rotation or
airflow. Remove all foreign materials before operating.
3. Vent System: Inspect all vent connections annually for looseness, for evidence of corrosion and for flue gas leakage.
Replace, seal, or tighten pipe connections if necessary. Check the power venter choke plate to insure it is secured in
place. Check the barometric draft control, if installed, to insure the gate swings freely.
4. System Safety Devices: With the heating system operating disconnect the pressure sensing tube from the pressure
switch on the venter. This should stop the burner operation. Re-connecting the tube will relight the burner. For 30
millivolt operating systems, disconnect one lead of the spill switch circuit from the thermocouple junction block. This
should shut off the pilot and the burner. Re-connection will allow re-lighting of the pilot.
REPLACEMENT PARTS LIST
The following items are available for replacement, if necessary.
REPLACEMENT PARTS LIST
DESCRIPTION
PVU-300
Motor 46512900
Blower Wheel 46513100
24 VAC Relay 46257300
Pressure Switch 46513200
CK-63/PVU Circuit Board 46399200