Featuring 80% thermal efficiency, these unit heaters use a collector box and power exhauster for maximum seasonal efficiency. With 250000 BTUs input / 20000 BTUs output the PDP250 can be vented vertically or horizontally and the power exhaust can be rotated a full 180°. These units are designed to use the smallest diameter vent pipe possible and if needed, converted from natural gas to liquid propane use in the field.
The PDP series features a 100% shut off, automatic restart and intermittent pilot that allows for continuous retry. If the pilot does not light, the system will continue to try to light every 6 minutes for 3 tries. After 3 tries, the system is locked out for an hour and then it tries the cycles again. Installed as standard equipment on all PDP units is the Time Delay Relay which warms up the heat exchanger for 30 - 90 seconds before the blower starts, allowing for whatever residual cool air is in the exchanger to be warmed up before being blown into the space.
Other standard features include:
- Single Stage Gas Valve
- Time Delay Relay
- Low Voltage Terminal Board
- Control Step Down Transformer
- High Limit Switch
- Pressure Switch
- Power Exhauster