Raypak 302-902 manual HI-DELTAModel902

HI-DELTAModel902

The black (hot) wire leads you directly to the Main Power Switch. This switch is located at the bottom right-front corner of the control compartment. When the main power switch is placed in the “ON” position, both the 120 v and 24 v terminal blocks on the Main Circuit Board will be powered and the power light will turn on. When the Auto On- Off switch is turned ON, the following 24 v safety components are immediately energized: Low Water Cut-off, Blocked Vent Switch, Manual Reset Limit Control, Low Gas Pressure Switch (optional) and the High Gas Pressure Switch (optional). At this point if all the preceding safety switches are closed, then Relay No. 1 (n.c.) will be energized and the safety light will turn off. The boiler is now ready for a call for heat.

When STAGE 1 calls for heat, the CALL FOR HEAT LIGHT will turn on. The Economaster Board will be energized and the pump will turn on. If the pump generates enough flow to activate the flow switch, the flow light will turn on, power will be applied to the thermostat terminal of the Ignition Module and the Blower will activate. The Air Pressure Switch will close, and the pressure switch terminal on the Ignition Module will be energized the blower light will turn on. The Unit will now undergo a 15 second pre-purge. After the pre-purge cycle, Hot Surface Igniter will heat up. The heat-up period takes about 30 seconds after which a trial for ignition is initiated. During the trial for ignition, which lasts for four seconds, power is applied to Firing Valve No. 1. If within four seconds, the Remote Sensor establishes flame rectification, then Firing Valve No. 1 stays open and the Stage 1 light will turn on. Power from the Valve terminal will power Relay K2 and K3. Power will be applied to Time Delay Relay No. 1 and after ten seconds Firing Valve 1A will turn on.

When Stage 2 calls for heat, power will pass through Time Delay Relay No. 2, then after 10 seconds through Relay K4, and then Firing Valve No. 2. The Stage 2 light will come on also, at this time.

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