Table of Contents
Advertisement
As power is applied to the DSI board, the system does the following:
1. A timing circuit allows the blower to purge the chamber.
2. The board supplies current to the gas valve and causes it to open. A manual
electrical switch is provided and must be in the "on" position for current to reach the
valve.
3. As the valve opens, the board sends a high voltage spark to the electrode at the
burner. The board detects the presence of a flame. If the flame is not sensed after
approximately six seconds, the board will lock out, shutting off power to the valve.
4. If the system does not ignite and the thermostat remains closed, the blower will
remain on until the thermostat is reset manually.
When the thermostat senses the desired room air temperature, the contacts open, remov-
ing power from the ignition system and shutting off the gas valve. The blower runs until
the heater in the relay cools and opens the circuit, shutting off current to the motor.
Annual Preventative Maintenance Inspection
The following preventive maintenance and safety checks should be performed by a
qualified technician once a year, or more, depending on the use of the furnace. Failure to
properly maintain the furnace may void the furnace warranty and can result in
unsafe furnace operation. Preventive maintenance is NOT covered under the war-
ranty. Power should be disconnected before servicing.
Gas Pressure – Using a U-tube manometer, with the furnace and all of the appliances
operating, the pressure should be eleven inches W.C. Improper gas pressure can cause the
furnace to work inconsistently and create unbalanced combustion.
Voltage – Voltage should be between 10.5 and 13.5 VDC at the furnace during
operation. The power at the furnace needs to be checked with each of the following
power sources when applicable: generator, battery, and converter. Low voltage can cause
the furnace to overheat and cycle. High voltage can cause unbalanced combustion, and
excessive motor wear.
Note:
To increase motor life, the furnace should be wired directly to the battery.
Ducting and Return Air
All heat discharges, registers and return air grills must be free and clear of obstructions.
Obstructions will prevent the furnace from performing correctly. This includes all
closable registers that are intended to reduce air flow, not shut it off completely.
For complete operation of furnace, see the operation manual supplied and published by
the manufacturer of this furnace.
5 1
Hide quick links:
Advertisement
Table of Contents
