Tenney BTS - Page 23

TENNEY ENVIRONMENTAL
TROUBLESHOOTING GUIDE - Continued
PROBLEM
7. Refrigeration System Dead
POSSIBLE CAUSE
Controller output 1CI-02 failing to
close
Contactor
2CON failing to close
Compressor motor overload
protector has tripped
8. Compressor hums but will
W not start
CORRECTIVE ACTION
Verify - Contact Tenney Service
Replace
Wait
5 minutes, if overload does
not close
- replace it
Pressure Switch
IPS not closing
Low Line
Voltage
Verify - Contact Tenney Service
I
Get proper electrical service
~ ~~
Internal compressor problem
I
measure winding resistance, test
for
~rounds, contact Tenney
W
9. Repeated shorting or
I
Excessive start time, voltage too Correct low line voltage problem
blowina of start
canacitors low 1
Starting Capacitor is defective
Replace
~ -
10. Compressor starts, hums,
runs slowly, staying on
start winding
11 1 Pressure switch 2PS not closing 1 Contact Tenney Service I(
Com~ressor relay defective
11. High Stage Compressor Will
Not Run (Cascade System)
12. Low Stage Compressor Will
Not Run (Cascade System)
Replace
Low Line Voltage
Compressor relay is stuck
Shorted winding
I
Artificial loading valve 14SOL
stuck open full time 1
Get proper electrical service
Replace
Test resistances, test for grounds.
Notifv Tennev
Any cause in Problem
#I or #7
Any cause in Problem #l or#7
13. Low Stage Runs, But Little
Or No Coolina
Replace
Do as stated
Do as stated
1 Main cooling coil badly frosted 1 Raise temoeraturetodefrost 11
Pressure switch 3PS not closing
Low stage is low on refrigerant
Verify that high stage is running
Have system leak tested
14. Compressor runs but cools
inefficiently
Restricted ventilation, dirty
condenser fins
Move unit away from wall, clean
condenser fins