Raypak 503-2003 Installation And Operating Instructions Manual

Also see for 503-2003: Installation & operating instructions

Raypak 503-2003 Installation And Operating Instructions Manual Manual pdf 33 page image

SECTION C: Installation31To make an adjustment to a setting in the control, beginby selecting the “ADJUST” menu. To change from theview menu to the adjust menu, simultaneously pressand hold all three buttons for 1 second. The menuname, “ADJUST” will be displayed in the menu field.The menu will automatically revert back to the viewmenu after 20 seconds of keyboard inactivity. Thenscroll to the desired item using the scroll button. Fi-nally, use the ▲or ▼ button to make the adjustment.In the absence of other information, the values pro-vided in Table N should be used as default settings.Heater Sequence of OperationModel 503 - 15031. The black (hot) wire lead, located at the right-middle front inside the control compartment, goesdirectly to the main power switch.2. When the main power switch is placed in the“ON” position, the 120 VAC terminal block in thecontrol compartment, the N.O. contacts of pumprelay, the N.O. contacts of blower relay, the120/24 VAC transformer, and terminals L1 and F1of the ignition module are powered.3. The 120/24 VAC transformer sends a 24 VAC hotpower signal to the 24V Terminal Block .4. 24 VAC is sent from the 24V Terminal Block tothe NO pump contacts on the modulating tempera-ture control (pin #13), to pin TP2 of the optionalalarm relay, to terminal R of the alarm circuit onthe modulating temperature control (pin #24) andthe green “Power On” LED on the front of theheater will illuminate.5. 24 VAC power is sent from 24V Terminal Blockto Pin P1-1 of the UDB board, the 24 VAC termi-nal of the ignition control module, the NC contactof the manual high limit, and L1 of the Low WaterCut Off (if equipped).24 VAC is sent from the NC contacts of the man-ual high limit to pin P3-1 & P3-2 of the UDBboard.Upon loss of water in the heater, the Low WaterCut Off (if equipped) will send a 24 VAC signal topin P3-4 of the UDB board to indicate a safetyfault.6. A 24 VAC signal is sent from the NO contacts ofthe Low Water Cut Off to the common terminal ofthe Blocked Vent Switch.During a blocked vent condition a 24 VAC signalis sent from the NO open contacts of the BlockedVent Switch to pin P3-5 of the UDB board to indi-cate a safety fault.7. During normal operation of the heater the 24 VACsignal exits the NC contacts of the Blocked VentSwitch and is sent to the common terminal, of theLow Gas Pressure Switch (if equipped).During a low gas pressure condition 24 VAC issent from the NC contacts of the Low Gas Pres-sure Switch to pin P3-6 of the UDB board toindicate a safety fault.8. 24 VAC is sent from the NO contacts of the LowGas Pressure Switch to the common terminal ofthe High Gas Pressure Switch (if equipped).During a high gas pressure condition 24 VAC issent from the NO contacts of the High Gas Pres-sure Switch to pin P3-7 of the UDB board toindicate a safety fault.9. 24 VAC is sent from the NC contacts of the HighGas Pressure Switch to the common terminal ofthe Auto Reset High Limit (if equipped) and to en-ergize the coil of optional alarm relay.If the Auto Hi Limit opens, 24 VAC is sent fromthe NO contacts of the Auto Hi Limit to pin P3-3of the UDB board to indicate a safety fault.10. 24 VAC is sent from the NC contacts of the AutoReset Hi Limit to the common terminal of time de-lay relay.11. 24 VAC is sent from the NC contacts of time delayrelay to the common terminal of the burner switchlocated on the front exterior panel of the heater.12. Power then travels to the enable/disable connec-tion and to the Ht D (heat demand) connection ofthe modulating temperature control.Power splits from the enable/disable and goes tothe stage contact of the modulating temperaturecontrol (pin #15).13. When the stage contact closes on the modulatingtemperature control, 24 VAC is sent to the com-mon terminal of the flow switch and to pin P1-3