No Heat; Discharge Too Cool; Hunting (External Causes); H-Trac - EngA C-TRAC2 Installation, Operation And Maintenance Manual

A

No Heat

Note the comments in the overheating section above about setting the control as a discharge only
control before proceeding.
Ensure switch 8 is in the off position.
Is the C-TRAC2.1 in the heating mode?
The heat light should be on. If it isn't, de-energize power to the C-TRAC2.1 and then replenish it.
This will cause the C-TRAC2.1 to quickly go into heating mode.
Is there heat output from the C-TRAC2.1?
Measure the DC volts between C-TRAC2 terminals HT and B (and/or HD and B on the C-TRAC2.1).
If there is over 0.75 vdc, the C-TRAC2.1 is in the heat mode. This test requires a load to be
connected to C-TRAC2.1 if measuring on terminals "HT" and "B". If there is no heating controller
connected then substitute a 10,000-ohm resistor.
Is the discharge sensor good?
First disconnect the discharge sensor and measure the resistance across it. Refer to the table
(Page 15) for approximate resistance values. Next measure the resistance from each leg to ground
with the fan off and then while the fan is running (because some sensors check out ok when the fan is not
running). Resistance to ground on the sensors should be infinite. If these readings are good, turn
off the power to the C-TRAC2.1, jumper the discharge sensor and reenergize it. This will place the
C-TRAC2.1 into a heat mode with maximum heat call. If the voltage output across C-TRAC2.1
terminals "HT" and "B" goes to about 8.5 VDC (or terminals "HD" to "B" are above 9.7 VDC on the C-
TRAC2.1) then the C-TRAC2.1 is okay. The sensor and/or set point may be faulty. The above test
requires a load to be connected to C-TRAC2.1 terminals "HT" and "B". If there is no heating
controller connected then substitute a 10,000-ohm resistor across "HT" and "B".

Discharge Too Cool

Note the primary comments in the overheating section above, about setting the control as a discharge
only control before proceeding.
Is the sensor located in a good sensing location?
A good sensing location is where there is a high volume of non stratified air, which is a good
representation of the average temperature.
Is the system calibrated properly?

Hunting (External Causes)

H-TRAC

If the C-TRAC2.1 is controlling a H-TRAC, ensure that the H-TRAC deadband pot is set to a maximum.
(Set H-TRAC cal pot to 9.)

G-TRAC, DJM2.1

If the C-TRAC2.1 is controlling a DG or a DJ unit that is operating below the low fire range there will be
some hunting as the burner cycles on and off. Reduction of the hunting may not be possible without
optimum burner set up. (Proper low fire rate.)
G-TRAC
*** On C-TRAC2.1 pot 6 does not exist. ( See Page
Set C-TRAC Pots
P3 = 6 min. as high as 9
P6 = 5 ***
P11 = 2
15
Page iii
C-TRAC2.1 MANUAL
Set G-TRAC Pots
P5 = 2
P6 = 4
P8 = 4
– Suggested Settings Re Hunting Problems)
March 1999 R1