Boyertown Regal Oil Furnace Nrg Max - Manual (Page 17)

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A Metal Oxide Varistor (MOV) which is a “surge suppressor” device must remain installed
across the “R” and “C” thermostat terminals of the NRG Max 9103i Universal Oil Furnace Control as
shown in the wiring diagrams. This device will route voltage surges around the control and will prevent
damage to the NRG Max 9103i Universal Oil Furnace Control.
Notice
Wiring
Electric shock hazard can cause severe personal injury or death if power source,
including service switch for the furnace, is not disconnected before installing or servicing the unit.
All wiring must conform to the National Electrical Code NFPA 70, latest edition and any additional
state or local codes.
All wiring must be N.E.C. Class 1. If original wiring as supplied with the furnace must be replaced,
replace with type 105
º C wire or equivalent only.
Power
Supply wire for the furnace must be sized for the load requirement as listed on the furnace rating plate.
Connect 120 VAC 60HZ single phase separate electrical line from the main house panel to the power
leads attached to the furnace fan timer board as indicated in the electrical wiring diagrams. Provide a
fused disconnect in the power line following all code requirements. Connect the burner to the factory
wired burner harness as shown in the electrical diagrams.
Provide electrical ground at the furnace as required by codes.
Oil Burner
Attach the supplied burner harness to the oil burner as per the instructions supplied with the oil
burner. A jumper wire must be placed between the “T-T” connections of the oil burner primary
control.
Emergency Power Switches
Oil burner emergency switches are to be installed as required by code. The homeowner should be
made aware of the location and proper operation of all emergency shut off switches
Thermostat Wiring Connections
All thermostat connections are to be made on the nrgMax 9103i terminal strip. For ease of installation
remove the bolt in the bottom left corner of the control mounting plate and hinge the mounting plate
upward on the top two bolts.
When installing AC/HP the “O” terminal is for reversing valve energized for AC operation.
When installing a thermostat incorporating a humidistat it must be configured to break on high
humidity. The humidistat will cause the blower to run at 90% of the desired air flow for improved
dehumidification. A jumper wire must be installed between “R” and “DH” if no humidistat is
present to dehumidify.
It is recommended to use a thermostat with an outdoor sensor to make the fuel change over from heat
pump to oil instead of a fossil fuel kit.
WARNING