I have a trance chiller model CGACD1554EFNMM63FGHPRTW operating with the Honeywell w7900 (1U12).
2 - semi hemetic compressors.
I recently acquired this wonderful friendly unit.
The issue I seem to be experiencing is that the 1U12 isn't calling in for the 3rd stage on both compressors.
Prior to that the water leaving sensor was changed with a new one and has heat transfer co Lund to make sure proper temp is read.
The sensor was also ohmed out. It's reading properly.
My main question is, does anyone think that it would be ok to piggy back the 3rd stages off the 2nd stages?
I observed the following on start up -
1U12 lights second LED stating start up.
After time delay -
Stage 1 on compressor 1 comes on.
Compressor runes for so long, then condenser fan runs.
Stage 1 on compressor 1 starts up.
10-15 seconds later, stage 2 on compressor 1 activates.
10-15 seconds after, stage 2 on compressor 2 activates.
Stage 3 never activates on either compressor.
Water entering temp is roughly 70-72 degrees (bad gauges)
Water leaving temp is roughly 65 degrees according to gauge.
Ambient temp is 85.4F
Pump return pressure reads 18measily psi
Pump supply pressure reads 33psi.
There's no flow meters either.
Couldn't honestly say I know what's the current gpm.
Pressures last checked were relatively good.
I hope my information is helpful to an extent.