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Consult sizing guide or factory. The D-2 Power Vent assembly is suitable for through the wall venting, and for connection to smaller size vent pipes and breeching other than the standard atmospheric heater. 7 LEFT SIDE Fig. 5: Through the Wall Vent The D-2 Power Vent assembly includes a wire harness, shown in Fig. 6 below, which provides quick connec- tions with the respective controls in the heater control box. The harness is of sufficient length to fit the appliance for which it is sized. Reference the wiring diagram supplied with each appliance for actual connections. RELAY Y/BK V/BK PRESSURE SWITCH GAS VALVE Y/BK Y/BK V/BK V/W V/BK V/W Fig. 6: D-2 Power Vent Wire Harness 8 9 Wiring Diagrams—182-260 H4/WH1 (Atmospheric) 10 181-261 H4/WH1 (Low NOx) 11 Wiring Diagrams—330-400 H4/WH1 (Atmospheric) 12 331-401 H4/WH1 (Low NOx) D 12.95 C 1.88 4.38 SEE TABLE D FOR DIMENSIONAL DATA Model No. A B C D 181 18.13 12.38 7.88 4.25 182 18.13 12.38 7.88 4.25 260 18.13 12.38 7.88 4.25 261 18.13 12.38 7.88 4.25 330 17.50 15.75 7.63 6.00 331 17.50 15.75 7.63 6.00 400 17.50 15.75 7.63 6.00 401 17.50 15.75 7.63 6.00 Table D: Dimensional Data 13 Sequence of Operation On call for heat, the D-2 Power Vent fan (and appli- ance pump) start. When the flow switch circuits close, the ignition system consisting of an electronic spark module, pilot gas system and flame sensor, are ener- gized. When draft proving switch closes and all safety circuits are proven, the automatic main gas valves will open and the heater will operate. When the operating limit circuit is satisfied, the heater will shut down. Start Up Procedures The water system, the gas system and the electrical system for the heater should be completed and checked as per the heater installation manual and associated documents. 1. Turn on power to the heater with the manual main gas valve and pilot gas valve off. The electric power supply requirements are: a. Dual-voltage fan motor. 120/240 volt 60Hz 1.0/1.95 Amp fan motor for models 181-401. 2. Check power connections. 3. Close heater power switch. 4. Set operating control to call for heat. a. Fan motor starts, draft proving switch clos- es. b. Heater pump starts, flow switch closes. c. Ignition module energized. d. Check for spark at gas pilot. 5. Turn operating control to end call for heat. 6. Wait a minimum of 60 seconds. 7. Open pilot gas valve. a. Repeat procedure outlined in #4 above. 8. After pilot gas is proven and main safety shut-off valve is energized. a. Main burners will ignite. 9. Heater will operate until call for heat is satisfied. 10. Restart unit and visually check all components for proper operation. 11. Check all vent connections and joints for leakage. Correct if found. 12. To restart unit after a failure, follow the procedures outlined above and other subsequent or related sec- tions outlined in the heater manual. EMERGENCY SHUTDOWN: SHUT OFF ALL POWER AND GAS, CALL GAS UTILITY. Draft Proving Switch The draft proving switch insures that the blower is operating. The switch is in the limit circuit and does not allow the ignition module to operate unless it is closed. NEGATIVE PRESSURE CONNECTOR Fig.7:DraftProvingSwitch 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Call Out Description 181-261 330-401 1 Relay 008784F 008784F 2 Blower 008156F 008156F 3 NO Pressure Switch 008062F 008135F 4 Elbow 4"-90° with Screen 010827F 010827F 5 Flue Box 008682F 008683F 6 Base Assembly 008684F 008685F 7 Flue Collar 008686F 008686F 8 Flue Adaptor 008687F 008688F 9 4" Flange 008689F 008689F 10 Blower Adaptor 008690F 008690F 11 Control Cover 008691F 008691F 12 Control Swaybrace 008692F 008692F 13 Silicone Hose 008693F 008693F 14 Front Panel 008694F 008694F 15 Blower Cooling Fan 011549F 011549F Illustrated Parts List Raypak, Inc., 2151 Eastman Avenue, Oxnard, CA93030 (805) 278-5300 Fax (805) 278-5468 Litho in U.S.A. ...

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