Howden Xrv 127 Manual May 2026

Howden XRV 127 — An Engaging Owner’s Guide

8. Troubleshooting Common Issues

A. Low Oil Pressure

  • Cause: Clogged oil filter, low oil level, worn oil pump, or refrigerant dilution in oil.
  • Solution: Clean filter, add oil, check oil heater operation.

B. Compressor Noisy Operation

  • Cause: Liquid refrigerant floodback (slugging), worn vanes, or bearing failure.
  • Solution: Check superheat setting on expansion valve; inspect vanes; replace bearings.

C. High Discharge Temperature

  • Cause: Low suction pressure, high pressure ratio, faulty oil injection, or dirty condenser.
  • Solution: Adjust system set points, clean condenser, check oil injection valve.

D. Capacity Control Not Working

  • Cause: Frozen slide valve (if equipped), faulty solenoid valves, or loss of control pressure.
  • Solution: Inspect solenoid coils and check control tubing for blockages.

Before you run it — a short pre-start checklist

  1. Visual inspection: No shipping brackets, debris, or loose hardware inside the housing. Impeller spins freely by hand (with lockout).
  2. Alignment & mounting: Ensure the driver and blower shafts are aligned to spec; soft mounts or grouting is secure.
  3. Lubrication: Bearings filled/greased per the manual schedule and correct grease type.
  4. Rotation check: With power briefly applied (locked out properly), confirm rotation direction matches the arrow on the housing.
  5. Instrumentation: Vibration sensors, tachometer, and temperature probes connected and zeroed.
  6. Safety guards: All guards and covers in place on belts/couplings.

6. Startup Procedure

  1. Rotation Check: Jog the motor momentarily to ensure the direction of rotation matches the arrow on the compressor casing. Running backward will damage the vanes.
  2. Oil Pre-heating: If the unit has an oil heater, ensure the oil has been warmed for at least 12-24 hours prior to startup to prevent refrigerant dilution.
  3. Valve Positions: Open the suction service valve and the discharge service valve. Ensure the oil isolation valve is open.
  4. Start: Start the compressor. Listen for abnormal noises.
  5. Operation: Check the oil pressure differential. The oil pressure should be higher than the crankcase pressure by the specified amount (typically 1.5 to 3 bar, verify with specific dataplate).

Howden XRV 127 Rotary Vane Compressor: Operation & Maintenance Manual

Q4: Can I perform impeller balancing using instructions from the manual?

The manual describes how to check balance (by marking the heavy spot) but not how to dynamically balance. It explicitly states: “Dynamic balancing must be performed by an NDT-certified technician using ISO 1940-1 equipment.” howden xrv 127 manual

1. Technical Specifications (Typical)

  • Type: Rotary Vane, Oil-flooded.
  • Displacement: Approximately 127 m³/hr (at 1450 RPM) — Note: Actual flow depends on RPM and pressure differentials.
  • Pressure Ratio: Typically up to 3:1 (or higher in multiple stages).
  • Max Discharge Pressure: Usually around 3.5 to 4 bar (g) for a single stage, but check your specific data plate.
  • Rotor Diameter: Check specific model plate (usually part of the 100-200mm series range).
  • Rotation: Unidirectional (Direction is indicated by an arrow on the crankcase).
  • Cooling: Oil-cooled (oil injected into the compression chamber).