154
106308-05 - 3/23
APEX Installation, Operating, & Service Instructions
Figure Number
Page
Number
Description
Section 7 - Gas Piping
Figure 7-5 55 Recommended Gas Piping
Figure 7-7 56 Gas Inlet Pressure Tap and Pressure Switch Location
Section 8 - Electrical
Figure 8-2 59 PCB Locations for Field Wiring
Figure 8-3 59 120 VAC Field Wiring
Figure 8-4 60 Low Voltage Field Wiring
Figure 8-5 61 Ladder Diagram
Figure 8-6 62 Wiring Connections Diagram
Figure 8-7 63
Modified Wiring For DHW Priority When Using Low Flow Circulator Piped Off System Header -
Heating (with Central Heating Circulators) Plus Alternately Piped Indirect Water Heater
Figure 8-8 64
Modified Wiring For DHW Priority When Using Low Flow Circulator Piped Off System Header -
Heating (with Central Heating Zone Valves) Plus Alternately Piped Indirect Water Heater
Figure 8-9 65
Multiple Boiler Wiring Diagram, Internal Multiple Boiler Control Sequencer (Three Boilers
Shown, Typical Connections for up to Eight Boilers)
Figure 8-10 66 Multiple Boiler Wiring Diagram w/Tekmar 265 Control
Figure 8-11 67 Multiple Boiler Wiring Diagram w/Tekmar 264 Control
Section 9- System Start-Up
Figure 9-1 70 Operating Instructions
Figure 9-4 72 Burner Flame
Figure 9-5 & A-3 72 & 151 Gas Valve Detail
Section 10 - Operation
Figure 10-2 80 Limit String Status Screen Showing Central Heat Demand
Figure 10-3 80 Home Screen
Figure 10-6 81 Main Menu Screen
Figure 10-12 83 Sequence of Operation
Figure 10-13 83 Home Screen Details
Figure 10-14 84 Status Screen Navigation
Figure 10-15 85 Status Screen Detail
Figure 10-16 86 Operations Screen
Figure 10-17 86 Entering Adjust Mode
Figure 10-18 87 Adjusting Parameters
Figure 10-19 & A-1 89 & 150 Boiler Model (Boiler Type) Decoding
Figure 10-21 96 Outdoor Reset Curve
Figure 10-24 106 Multiple Boiler Sequence Diagram (3 boiler system shown, typical for up to 8 boilers)
Section 11 - Service and Maintenance
Figure 11-1 118 Igniter Electrode Gap
Figure 11-2 119 Condensate Overflow Switch Orientation
Figure 11-3 120 Control Compartment Access for Stacked Boiler Installations
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