SamRock
13-08-2013, 02:03 AM
I got a call from a customer about walk in cooler at one of her stores.
We get to the site and its a Singer system from the late 70s but looks to be in good shape for 30+ years of use. The head master valve was wide open stacking refrigerant.
Indoor coil info
Make Singer
MN: HDC150-1
SN: 18-00916
The TXV was stamped R500 with no other markings
As per HeatCraft 15000 BTU 25*SST/10*TD "Evap is for cooler only as it has no heaters"
Outdoor unit
Make Singer
MN/SN Tag missing
Hand written tag on unit said R507
Compressor Copeland EADB-0200-CAB
Compressor is low temp R22/502 with 67000 BTU @ -25* evap / 105* cond
Before starting work box temp was at 50*F
Suction 60psi SH 70
Liquid 345psi SC .78
Shot off to supply house picked up a new
1 - Sporlan Head Master OROA58058ODF
1 - Emerson TXV HFE1RC 12000 BTU Med temp r404A
2 - POE oil
1 - Liquid Dryer
1 - See All
1 - Start cap
1 - Run cap
Back to customers store and do the good deeds. System started up and ran fine with below stats
Indoor Unit
28* Evap Air Discharge temp
36.5* Evap Air Return temp
19.8* TXV Dist tube 1
13.2* TXV Dist tube 2
21.8* TXV Dist tube 3
19.5* TXV Dist tube 4
26.8* Suction line temp
108.4* Liquid line temp
23* Evap surface at inlet
26* Evap surface at outlet
33* Box temp at stat
71% RH
Outdoor Unit
85.2* Condenser Air inlet W/ 86% RH
91.9* Condenser Air outlet
48.7psi Suction
26.4* Suction SH
11.2* SC @ Receiver outlet
7.6* SC @ Condenser outlet
282.9psi Hot Gas
23.5 Compressor SH
128* Compressor Motor end temp
102.5* Condenser face inlet temp
93.5* Condenser face outlet temp
At time of shut down
30* Box temp
10.6* SH @ Condenser
47psi Suction
281psi head
Cycle time
18min off
24min on
All was good until I put the cover back on the terminal box of the compressor, the next run cycle got about half way through and the thermal protector kicked out the compressor. I pulled a new one from the truck popped it in and the same thing 14min into the on cycle it kicked out on thermal. The compressor is pulling 7.84A and only shuts down with the cover installed...:mad:
Thanks for any input given.
SR
We get to the site and its a Singer system from the late 70s but looks to be in good shape for 30+ years of use. The head master valve was wide open stacking refrigerant.
Indoor coil info
Make Singer
MN: HDC150-1
SN: 18-00916
The TXV was stamped R500 with no other markings
As per HeatCraft 15000 BTU 25*SST/10*TD "Evap is for cooler only as it has no heaters"
Outdoor unit
Make Singer
MN/SN Tag missing
Hand written tag on unit said R507
Compressor Copeland EADB-0200-CAB
Compressor is low temp R22/502 with 67000 BTU @ -25* evap / 105* cond
Before starting work box temp was at 50*F
Suction 60psi SH 70
Liquid 345psi SC .78
Shot off to supply house picked up a new
1 - Sporlan Head Master OROA58058ODF
1 - Emerson TXV HFE1RC 12000 BTU Med temp r404A
2 - POE oil
1 - Liquid Dryer
1 - See All
1 - Start cap
1 - Run cap
Back to customers store and do the good deeds. System started up and ran fine with below stats
Indoor Unit
28* Evap Air Discharge temp
36.5* Evap Air Return temp
19.8* TXV Dist tube 1
13.2* TXV Dist tube 2
21.8* TXV Dist tube 3
19.5* TXV Dist tube 4
26.8* Suction line temp
108.4* Liquid line temp
23* Evap surface at inlet
26* Evap surface at outlet
33* Box temp at stat
71% RH
Outdoor Unit
85.2* Condenser Air inlet W/ 86% RH
91.9* Condenser Air outlet
48.7psi Suction
26.4* Suction SH
11.2* SC @ Receiver outlet
7.6* SC @ Condenser outlet
282.9psi Hot Gas
23.5 Compressor SH
128* Compressor Motor end temp
102.5* Condenser face inlet temp
93.5* Condenser face outlet temp
At time of shut down
30* Box temp
10.6* SH @ Condenser
47psi Suction
281psi head
Cycle time
18min off
24min on
All was good until I put the cover back on the terminal box of the compressor, the next run cycle got about half way through and the thermal protector kicked out the compressor. I pulled a new one from the truck popped it in and the same thing 14min into the on cycle it kicked out on thermal. The compressor is pulling 7.84A and only shuts down with the cover installed...:mad:
Thanks for any input given.
SR