A G-TRAC2 MANUAL
General Manual Revised: 03/15/99
pressure), temperature, and the correction factor for the meter are often overlooked, thus leading to an incorrect
conclusion.
Inlet gas pressures are recorded on the unit label. At high fire inlet gas pressure to the unit should not fall below
6.25" on units designed for 7" inlet pressure. If design is for 14" pressures should not fall below 12" and should
not rise above 14” on 7” inlet and above 18” on 14” inlet.
If design is for 11" propane gas, then inlet pressures should not fall below 10". Note that with propane fired units it
may be necessary to equip the propane system with a properly sized vaporizer. Should not rise above 16” on high
fire on 11” inlet.
XIV. SPECIAL SERVICE NOTES
On Board Fuse
The G-TRAC2 is equipped with a 2-amp fuse. This fuse is located on the bottom of the main board and is
accessed from behind the board. If there is 24 VAC to terminals T1 and T2 and the DC voltage from terminals PH
to PL is 0 VDC, check the fuse. (10.0 to 11.0 VDC is normal if fuse is okay.)
Low Limit Lockouts
NOTE: If your application does not require it, the Low Limit could be disabled (dipswitch C-5). If there is an
intermittent problem with the discharge sensor, a false low limit lock out code may be generated. This
happens if the discharge sensor generated an initial lockout and then the reason for the sensor lock out
disappeared. (Refer to Section X for more detail on the low limit.)
To reset, remove power from FS and HS simultaneously and resume power to them (or turn off main power).
If the discharge sensor calibration is not correct, you can also have low limit lockouts.
Be aware if the heat call light comes on, the burner lights, and there is still not enough heat to allow the discharge
temperature to rise above the 40ºF - low limit setting for the period of time that the low limit is being bypassed.
The low limit light will come on when the unit locks off. If the low limit sensor then warms up, both the heat call
and low limit light should remain on until someone resets it by turning the power off to the G-TRAC2. We strongly
recommend that no one reset the control until the status of all of the troubleshooting lights are recorded.
Failed Operation or Solid State Control Contacts by Others
There have been a number of new controls introduced into the marketplace recently. These allow a building to be
controlled by a central computer (BMS or Building Management System). Many of these devices use relays to
switch external power devices on and off and their operation is fine. However, some of the new devices use
opto-couplers or solid state contacts . These devices will not interface properly with the G-TRAC2 contacts
FS, HS, K, or terminal 3”. The solid state contacts allow enough voltage leaks through them when they are in
an off (open) position to cause the G-TRAC2 to malfunction. Voltage leaks of 4 to 5 VAC are common. Only dry
contacts should be tied to the G-TRAC2 terminals unless instructed to do otherwise.
Air Balancing (Refer to next item).
Cold Discharge Temperature in Cold Weather
Installation and air balancing is often done during warmer weather than that experienced in the cold of winter. If
the air balancer did not allow for the changes that will occur in air volume in cold weather then the unit will appear
to be short of temperature rise. The fan is a constant volume device and as it is located before the heat
exchanger; therefore, air will expand as it is heated. The amount of change will be about 20% increase in air
volume from -30ºF to +70ºF.
(30 paginas)
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