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Model Description:
Parts are available, however complete unit is no longer available and is replaced by model
View Owner's Manuals for Aprilaire 550A:
Part Categories for Aprilaire 550A:
Complete Units | Controls | Covers | Filters | Frames | Hoses, Valves, and Regulators | Other Parts | Panels | Transformers | TubingAccessories for all Humidifiers:
Chemicals | Complete Units | Other PartsAll Parts for Aprilaire 550A: | ||||
|---|---|---|---|---|
Complete Units | ||||
| Ref. | Image | Part No & Description | Price | |
 | 550A - Humidifier Complete Unit View Part Info | $152.68 | Add to cart | |
Controls | ||||
| Ref. | Image | Part No & Description | Price | |
 | apr8052 - Outdoor Temperature Sensor View Part Info | $11.53 | Add to cart | |
| 15A |  | APR56 - Humidistat For Autotrac Has Outdoor Temp View Part Info | $92.58 | Add to cart |
| 18 |  | apr4305 - Gasket Automatic Humidifier Control View Part Info | $4.73 | Add to cart |
Covers | ||||
| Ref. | Image | Part No & Description | Price | |
| 17 |  | apr4225 - Cover Latch Spring View Part Info | $9.33 | Add to cart |
| 7 |  | apr4222 - Cover With Latch And Label View Part Info | $77.90 | Add to cart |
Filters | ||||
| Ref. | Image | Part No & Description | Price | |
 | a10wr-rps - Wicking Style Filter #709 View Part Info | $12.12 | Add to cart | |
| 1 |  | aprA10-RPS - Aprilaire #10 Pad Hard Wick View Part Info | $7.83 | Add to cart |
Frames | ||||
| Ref. | Image | Part No & Description | Price | |
| APR4598 - Ionizer Frame Assembly View Part Info | $173.45 | Add to cart | |
| 2 |  | apr4217 - Filter Frame For Aprilaire View Part Info | $18.07 | Add to cart |
| 3 |  | APR4218 - Distributor Tray For View Part Info | $17.42 | Add to cart |
Hoses, Valves, and Regulators | ||||
| Ref. | Image | Part No & Description | Price | |
 | A01-0814-148 - Water Valve 24 Volt View Part Info | $62.42 | Add to cart | |
| apr4229 - Saddle Valve Adapter View Part Info | $51.54 | Add to cart | |
| 10 |  | apr4004 - In Line Strainer View Part Info | $4.99 | Add to cart |
| 11 |  | APR4001 - Saddle Valve For Aprilaire View Part Info | $19.99 | Add to cart |
| 12 |  | APR4231 - Orifice Yellow View Part Info | $4.20 | Add to cart |
| 16 |  | apr4184 - Nozzle For Aprilaire View Part Info | $9.33 | Add to cart |
| 8 |  | apr4223 - Drain Spud For Aprilaire View Part Info | $4.31 | Add to cart |
| 9 |  | apr4040 - Water Valve. Can Also Use A01-0814-148 View Part Info | $69.99 | Add to cart |
Other Parts | ||||
| Ref. | Image | Part No & Description | Price | |
 | apr4039 - Plate Humidstat View Part Info | $9.33 | Add to cart | |
 | apr4280 - Shock Arrestor View Part Info | $129.20 | Add to cart | |
 | APR51 - Current Sensing Relay View Part Info | $38.68 | Add to cart | |
 | GA50 - Relay Current Sensing View Part Info | $36.00 | Add to cart | |
| 15B | | APR4655 - Manual Humidistat View Part Info | $47.28 | Add to cart |
| 4 | | APR4219 - Base 550 View Part Info | $75.21 | Add to cart |
Panels | ||||
| Ref. | Image | Part No & Description | Price | |
| 5 | | APR4220 - End Panel Model 550 View Part Info | $57.12 | Add to cart |
| 6 | | APR4221 - Duct Panel View Part Info | $52.99 | Add to cart |
Transformers | ||||
| Ref. | Image | Part No & Description | Price | |
| 14 |  | apr4010 - Transformer For Aprilaire View Part Info | $28.40 | Add to cart |
Tubing | ||||
| Ref. | Image | Part No & Description | Price | |
| 13 |  | apr4226 - Feed Tube With Compression View Part Info | $12.17 | Add to cart |
Accessories for all Humidifiers: | ||||
Chemicals for all Humidifiers: | ||||
| Ref. | Image | Part No & Description | Price | |
 | FSRM6 - Humidafresh Rainforest Mist Water Treatm View Part Info | $6.24 | Add to cart | |
| AC802 - Humidifier Bacteriostatic Water Treatmen View Part Info | $6.82 | Add to cart | |
 | 1T-6 - Humdf Water Treatment32 Oz View Part Info | $5.18 | Add to cart | |
 | FSCA6 - Humidafresh Cinnamon Apple Water Treatme View Part Info | $6.24 | Add to cart | |
 | AC816 - Extra Strength Humidifier Cleaner View Part Info | $5.19 | Add to cart | |
 | FSFV6 - Humidafresh Vanilla Water Treatment View Part Info | $6.24 | Add to cart | |
 | 3US-6 - Water Treatment Cleaner View Part Info | $5.01 | Add to cart | |
 | 1PC-RPS - Humidifier Plastic Cleaner View Part Info | $0.00 | Not Available | |
Complete Units for all Humidifiers: | ||||
| Ref. | Image | Part No & Description | Price | |
 | HAP-440 - Holmes Complete Hepa Air View Part Info | $49.99 | Add to cart | |
Other Parts for all Humidifiers: | ||||
| Ref. | Image | Part No & Description | Price | |
 | MSP-100V - Oem Portable Stereo Speaker View Part Info | $16.99 | Add to cart | |
