|
|
Small Chiller Supply Providing independence from OEM pricing since 2003! ~ Controlling cost with better quality after-market products & retailing OEM parts ~ 7413 E. County Rd 6900, Lubbock, Texas 79403-7639 (806) 782-4570 email: myles.opheim@smallchiller.com |
|
|
| ~ SERVICE ~ |
 |
Service Warning Tips!
| 1. Remove cap tube & consider replacement - (Flush condenser / evaporator separately) | |
| 2. Evacuate & dry nitrogen pressure test before compressor installation with 2 fittings required - (Brazed plate evaporator sections and aluminum micro-channel condenser coils are the worst!) | |
| 3.Check or replace starter contactor block | |
| 4.Inspect circulating pump intake screen (possible blockage) | |
| 5.Test circulating pump volume (use flow meter) |
SERVICE WARNING PHOTOGRAPHS
| Compressor Failure-Scoring | Compressor Failure-Scoring | ||
 |
 |
||
A flushing agent (solvent) diluted the refrigerant oil. A loss of lubricity resulted in metal to metal scoring. Notice the carbon buildup from previous operation. The factory supplied PVE oil tends to be opaque in color. Only 30 minutes of run time. |
Comparasion: (Left ) Damage to factory finish. On the right: factory finish ground and tapped surface. Estimated: 250-500 RPMS surfce finish (L) and likely 8-16 RPMS (R) |
||
 |
 |
||
| Brazed plate evaporator | Brazed plate evaporator | ||
 |
 |
||
| micro-channel condenser | micro-channel condenser | ||
 |
 |
||
| Copper spun screen | liquid line filter – drier | ||
 |
 |
||
| Horizontal Slab shown | Vertical Slab shown | ||
 |
 |
The process tube shown is what the factory utilized as the second access fitting. If only one evaporator access is visible, be certain to sweat-in a high side flare fitting for proper evacuation. Pull from both sides of the capillary restriction! |
| Water-glycol sediments | Water-glycol sediments | ||
 |
 |
||
| Water-glycol sediments | Water-glycol sediments | ||
 |
 |
||
| **** Water-Glycol Cheat Sheet: | A Summary (pdf) Click here *** | ||
| Mineral Oil sediments | Mineral Oil sediments | ||
 |
 |
||
| Mineral Oil sediments | Mineral Oil sediments | ||
 |
 |
||
| Drop in Evaporator Coil - Stir Motor Bearing Change | Resin Pack Motor - Disassembly | ||
 |
 |
||
| Resin Pack Motor - 12 Watt | Resin Pack Motor - 12 Watt | ||
 |
 |
||
 |
 |
 |
| Examples of the Nichiden Kogyo service valve part# ZVH-W |
Adapting to SAE with Jerald-Brenda part#'s A31614 & A33000 |
ZVH-W cutaway view |
 |
| ||
| No ingress protection | Straight edge demo | ||
 |
 |
||
| Poor ingress protection | KMV-150-M example | ||
 |
| ||
| KMV-150-M Service Call | Inside cabinet looking out through the condenser coil. Notice: light bulb on |
||
 |
 |
||
Inside cabinet looking out with building lights off. Exterior light bulb shows clean fins |
KMV-150-M service call Why the powder? Has a clean condenser coil! |
||
 |
| ||
Use foam matress material in an attempt to eliminate EJ alarm |
Even the HAVC tech must block airflow when testing. Failure to do so by-passes the condenser coil. |
||
 |
 |
||
Ambient air flow requirement; RATING: 35 degrees C (95 degrees F) Metric-ambient air passing over at 1 meter/second English-ambient air passing over at 3.3 feet/second |
FAIL: Axial ducting fan replaced by factory arrangement without shroud over condenser coil |
|
|
|
|
Office: (806) 829-2847 Cell: (806) 782-4570 email: myles.opheim@smallchiller.com