EMTOS Annual Preventative Maintenance Report
The annual preventative maintenance shall be conducted following a quarterly PM to ensure all equipment is fully inspected, cleaned, and functioning correctly. Inspectors should verify critical components, check for wear or damage, lubricate moving parts, and document any findings for follow-up actions.
Envent Corporation
11/18/2025
EMTOS Annual Preventative Maintenance Report
The annual preventative maintenance shall be conducted following a quarterly PM to ensure all equipment is fully inspected, cleaned, and functioning correctly. Inspectors should verify critical components, check for wear or damage, lubricate moving parts, and document any findings for follow-up actions.
EMTOS Annual PM
Unit #
Date
License Plate #
Inspectors
The annual preventative maintenance shall be conducted following a quarterly PM to ensure all equipment is fully inspected, cleaned, and functioning correctly. Inspectors should verify critical components, check for wear or damage, lubricate moving parts, and document any findings for follow-up actions.
Unit Hours Start
Meter name
Unit
Air Compressor Hours Start
Gas Meter Start
No Power on Unit
Trailer
Check tires for proper inflation and dry rotting or damage.
Inspect all lights for proper operation (running lights, turn signals, brake lights).
Pull break away wire and verify the trailer breaks work by driving truck forward.
Inspect leg stands and grease all Zerk fittings.
Check firebox to trailer bolts and holes for integrity.
Vaporizer
Check vaporizer thermocouple and make sure connections are secure (recrimp if necessary)
Check controller to ensure the knob can be fully turned into all positions.
Check silicone integrity around pilot ignitor transformer.
Open inlet "Y" strainer to check for propane butter. Depressurize line before breaking.
Remove 6-screw top cover to inspect refractory and doughnut gasket. Verify gasket is seated properly and clear of tank spacing.
Pressure Relief Valve: Inpect and replace if damaged or has not been changed in 5 years.
Inspect manufacture date and 3rd party service inspection date to verify date is within 8 years.
Main Electrical Panel
Tighten every wire termination to 1.2 Nm torque
Remove BMS and check terminations.
Check for open holes in each panel.
Signs of rust or water.
Inspect panel door gasket & conduit opening integrity.
Add desiccant packs if missing or replace if saturated.
Inspect wire condition (no wire rubbing against sharp edges)
Ensure spiral wire wrap is placed correctly to protect wires.
Ensure wire tiedowns are operational, replace if necessary.
Ignitor Electrical Panel
Tighten every wire termination to 1.2 Nm torque
Check for open holes in each panel.
Signs of rust or water.
Inspect panel door gasket & conduit opening integrity.
Add dessicant packs if missing or replace if saturated.
Inspect wire condition (no wire rubbing against sharp edges)
Ensure spiral wire wrap is placed correctly to protect wires.
Ensure wire tiedowns are operational, replace if necessary.
Auxiliary Electrical Panel
Tighten every wire termination to 1.2 Nm torque
Signs of rust or water.
Inspect panel door gasket & conduit opening integrity.
Add desiccant packs if missing or replace if saturated.
Inspect wire condition (no wire rubbing against sharp edges)
Ensure spiral wire wrap is placed correctly to protect wires.
Ensure wire tiedowns are operational, replace if necessary.
Chart Recorder
Verify plug connections and wires are tight for power, thermocouple input 1 & 2, alarm outputs, output control and ground terminals. Visually verify all ribbon cables are landed securely. Verify input cards are seated correctly and free of corrosion or damage.
Replace Chart Recorder battery.
Rotary Gas Meter
Drain oil in all three chambers and refill (left, right, and center).
Inspect and replace screen paper gasket on the inlet side and regular paper gasket on the outlet side.
California Only: Remove gas meter and send it to be calibrated and certified.
Flow Tubes
Remove all DS-300/400 flow elements and blow out with shop air, inspect and reinsert or replace.
Firebox
Inspect fire box sight glass windows and clean if dirty (separate from nipple not by opening the union/glass nut)
Remove manway door and inspect refractory on floor, roof, walls, process inlet, and burner.
Verify that the stack and fire box inlet sample points are funtional.
Burner
Verify burner cone integrity. Observe air gap on burner by removing burner. There should be at least ~1cm air gap around burner housing and cone.
Inspect burner damper and linkage assembly (wiggle linkage).
Inspect burner refractory discharge sleeve, check for cracks or broken studs.
Clean burner site glasses.
Combustion Blower: Visually inspect all blower mounting bolts for rust and tightness.
Verify burner gaskets are intact (visual).
Manual Butterfly Valves
4" Process Valve: Open gear assembly and grease gears.
Main Process Valve: Open gear assembly and grease gears.
Dilution Valve: Open gear assembly and grease gears.
Automatic Process Isolation Valve
Visually inspect mounting hardware and support brackets for signs of stress or wear.
Blowers & Compressors
Remove electrical motor cover, inspect wire terminations. Repair or replace connectors if needed.
Apply antifreeze.
Check gaskets.
Igniter/Ignition Transformer
Clean igniter, verify no corrosion on the connection point to transformers or to the igniter. Mark igniter position before removing. Replace if necessary.
Maxon or Eclipse Valves (SSOV 1& 2)
Open side panels, inspect gasket, check for water intrusion.
Check wire terminations.
Add oil if applicable.
High Temp. Thermocouple
Remove the internal elements of the stack thermocouple, perform element test based on Thermocouple Calibration & Replacement Procedure.
Combustion Thermocouple
Remove the internal elements of the firebox thermocouple, perform element test based on Thermocouple Calibration & Replacement Procedure.
Power ON Unit: Connect Generator and Propane
Air Compressor
Ensure a 0-150 PSI Pressure Gauge is installed before the regulator.
Verify the compressor stops at ~135 PSIG in the main tank.
Panel Lights
Activate each button and switch to confirm it lights up when turned on.
Area Lights
Inspect all area lights by turning them on, replace bulbs as needed, and check for rust or water damage.
Chart Recorder
Verify the display powers up with no error codes or flickering
Pen & Paper Operation: Correct date and time stamp, legible temperature recordings.
Temperature Accuracy: Compare temperature reading with High Limit Controller and verify readings are within 50F of each other.
Output Control: Test output control by placing in manual and driving the mod motor with the arrow keys.
Alarm Outputs: At 1400F, verify the top green panel light turns on, and the Process Isolation Valve opens.
Alarm Outputs: At 1550F, verify the top red panel light turns on. If temperature cannot be raised above 1550F, adjust Alarm setpoints A2S1 and A2S2 below current temperature to simulate.
Process Valve
Raise unit above 1400°F and verify valve fully opens and closes promptly. If the valve takes more than 30 seconds to close, replace the air dump valve.
Burner
Verify that the modulating actuator moves to high during the 90 second high fire purge and moves to low when the BMS says to start.
Interlocks
High Limit Temperature: While BMS is going into purge, change the set point below the chart recorder temperature and verify a "stoppage" in BMS activity.
High Limit Temperature: While unit is running, lower high temperature set point below chart recorder temperature and verify burner shut down.
UV Scanner: While unit is running, remove UV scanner from unit. Do not expose to direct sunlight. Cover optical lens and ensure that the unit shuts down.
LEL Analyzer: Calibrate LEL in accordance with the procesures, verify analyzer is not bypassed by valves or jumped wires behind LEL controller.
LEL Analyzer: Test high LEL shutdown by lowering the setpoint to 0%. (Add a bias if current reading is 0%) Verify the unit shuts down. Remove any added bias.
Process Blower Pressure Switch: Open cover of pressure switch and verify that sensor is not jumped. Remove tubing from sensor and verify that interlock is tripped on BMS.
Process Blower Pressure Switch: Verify on the pressure switch box that one wire is on common and one wire is on Normally Open.
Combustion Blower Pressure Switch: Open cover of pressure switch and verify that sensor is not jumped. Remove tubing from sensor and verify that interlock is tripped on BMS.
Combustion Blower Pressure Switch: Verify on the pressure switch box that one wire is on common and one wire is on Normally Open.
FA Temperature Switch: Remove temperature switch. Wrap heating element around probe, set temperature to 410°F. Verify contacts open with ohms meter at 400°F. (Different from Test Fire)
Rotary Gas Meter
Drain oil in all three chambers and refill (left, right, and center).
Inspect and replace screen paper gasket on the inlet side and regular paper gasket on the outlet side.
Firebox
Remove manway door and inspect refractory on floor, roof, walls, process inlet, and burner.
Scan the entire exterior firebox wall with a temperature gun and record any areas exceeding 200°F.
Technician Closure Signature
PM Lead
PM Lead Signature
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Supervisor Closure Approval Signature
Quality Check Name
Quality Check Signature
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Source: Envent Corporation (Community Member)