144 RT-SVX34C-EN
Diagnostics
(RHS) Return Humidity
Sensor
1. Economizer operates using
Referance Enthalpy.
4 to 20 mA
10 to 90% RH Honeywell
C7600A.
Check at ECA ECA 3 flashes.
RAH-1 and RAH-2 by
measuring current draw.
Remote Minimum
position Potentiometer
1. Economizer modulates but
minimum position stays at
zero.
Potentiometer range 50 to 200
Ohms.
*NONE* Check resistance at
ECA P and P1 50 to 200 Ohms.
Cooling Setpoint (CSP)
for CV ZSM slide
potentiometer
1. Uses HSP and CSP CSP=
HSP + 4 F or use RTRM Default
Mode.
100 to 900 Ohms Use ZSM Test
Procedures.
*NONE* Check at terminals 2
and 3 on ZSM
Heating Setpoint (HSP)
for CV ZSM slide
potentiometer
1. Uses CSP and HSP HSP=
CSP - 4 F.
100 to 900 Ohms Use ZSM Test
Procedures.
*NONE* Check at terminals 2
and 5 on ZSM.
TDL1, TDL2 or TDL3
(Temperature
Discharge Limit)
1. Comp1, Comp2 or Comp3
will not operate.
Open 230 F +/- 6.5 F
Close 180 F +/- 12.5 F
Normally closed
Cool Failure Output at RTRM J6-
8 to J6-6 LED blinks at ZSM.
HSP and CSP for CVare
both lost.
1. Cannot control at ZSM, unit
using RTRM Default Mode.
100 to 900 Ohms approx. Use
ZSM Test Procedures.
If a sensor is used at RTRM J6-
1 and J6-2, Cool Failure Output
at RTRM J6-8 to J6-6 "COOL"
LED Blinks at ZSM. If RTRM
senses a zone temp input and
then it is lost,
(ZTEMP) Zone
Temperature Sensor CV
or VAV during
Unoccupied mode.
1. No Heating or Cooling ZSM
"Fan" selection switch operates
IDM during Unoccupied Mode.
-40 TO 150 F
346K to 2.1K
CV Cool Failure Output at RTRM
J6-8 to J6-6 "COOL" LED Blinks
at ZSM
TC01, TCO2, TC03 High
Tem p Li m it
Heat goes off, IDM runs
continuously.
Normally Closed
Open 135 F
Reset 105 F.
Heat Failure Output at RTRM
J6-7 to J6-6 "HEAT" LED Blinks
at ZSM.
(LPC1) Low Pressure
Control
Compressor CPR1 will not
operate.
Open 25 PSIG
Close 41 PSIG.
Possible Cool Failure at RTRM
J1-8 to Ground, 0 VAC. "COOL"
LED Blinks at ZSM.
(LPC2) Low Pressure
Control Dual Circuits
Only
Compressor CPR2 will not
operate.
Open 25 PSIG
Close 41 PSIG.
Possible Cool Failure at RTRM
J3-2 to Ground, 0 VAC. "COOL"
LED blinks at ZSM.
(CCB1)
Compressor CPR1 will not
operate.
Normally Closed
range varies by unit.
Cool Failure Output at RTRM J6-
8 to J6-6 "COOL" LED blinks at
ZSM.
(CCB2 or CCB3)
Compressor Overload
Compressor CPR2 or CPR3 will
not operate.
Normally Closed
range varies by unit
Cool Failure Output at RTRM J6-
8 to J6-6 "COOL" LED blinks at
ZSM.
(HPC1) High Pressure
Control
Compressor CPR1 will not
operate.
Open 650 psig
Close 550 psig
Cool Failure Outputat RTRM J6-
8 to J6-6 "COOL" LED blinks at
ZSM.
(HPC2) High Pressure
Control
Compressor CPR2 or CPR3 will
not operate.
Open 650 psig
Close 550 psig
Cool Failure Output at RTRM J6-
8 to J6-6 "COOL" LED blinks at
ZSM.
(WTL1) Winding
Temperature Limit
Compressor CPR1 will not
operate.
Normally Closed
Cool Failure Output at RTRM J6-
8 to J6-6 "COOL" LED blinks at
ZSM.
(WTL2 or WTL3)
Winding Temperature
Limit
Compressor CPR2 or CPR3 will
not operate.
Normally Closed
Cool Failure Output at RTRM J6-
8 to J6-6 "COOL" LED blinks at
ZSM.
(CC1) Compressor
Contactor 24 VAC coil
Compressor CPR1 will not
operate.
Varies by unit
Cool Failure Output at RTRM J6-
8 to J6-6 "COOL" LED blinks at
ZSM.
(CC2 or CC3)
Compressor Contactor
24 VAC coil
Compressor CPR2 or CPR3 will
not operate.
Varies by unit
Cool Failure Output at RTRM J6-
8 to J6-6 "COOL" LED blinks at
ZSM.
Table 78. Component Failure Mode
COMPONENT FAILURE RESPONSE NORMAL RANGE DIAGNOSTIC
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