installation manual

05/15/2009 20 EI709
Troubleshooting
Comment: Also see the “WarmFlo Information” document (HD320) included with this manual.
Sensor Temperature Calibration – both remote sensors are digital electronic and factory calibrated.
Normally these do not require field calibration or verification. However, if sensor temperature error is
determined, use WarmFlo Analyzer test set or purchase special PC software disc and PC serial port cable.
These plug-in devices allow direct readout of both temperatures, allows a visual determination of
WarmFlo internal temperature settings, and can be used to offset either temperature sensor for
troubleshooting and demonstration purposes. This is especially valuable during summer installation. Call
local distributor and order WarmFlo Analyzer.
Override Staging, “E” Tab Input – during a normal roomstat heat call and E is jumpered to W, it brings
on all four stages and essentially bypasses any temperature sensing or stage modulation functions. In
other words, with an E input (still need the normal W stat input) this is simply a turn-on/turn-off device.
Heat pump application – with the E input the heat pump is still on and the user must have concern for
adequate airflow when energizing all elements. E jumpered to W should never be considered a normal
usage. This can be used during defrost, see previous hookup paragraph.
Operational Conditions, Forcing Standby – these conditions are also monitored by the front panel EL
mode light being off.
1. Utility Load Control
2. SOT S timeout
3. MU timeout
4. OT below switchover set point - configuration mode setup dial switch also defines switchover
function
5. Front override switch
6. Option WF-HP2 or WF-LGR4 interface has setup a standby condition
Operational Conditions Which May Prevent Standby or Gas On
1. No call for heat - T-call LED is off
2. LED EL ON mode- utility is not controlling or front panel is not in override
3. Somehow stat terminal block Y is also energized or at 24 volts
4. Board K1 or K2 open/inoperative
5. Hang-up - power down, 10 seconds, power up
Operational Conditions Which May Prevent EL Stages On (No Stage LED’s)
1. No call for heat - T-call LED is off
2. In standby mode, see previous section
3. Hang-up - power down, 10 seconds, power up
Conditions Which May Prevent Electric Elements On, With Staging LED’s On
1. Mechanical hi-limit, front panel top LED on
2. Board K1 or K2 open/inoperative
3. Inoperative element relays
4. Inside AC to DC power supply board bad
5. Circuit breakers off
6. Burn 240 inside wires
7. Building power panel fusing or breakers
Outdoor Sensor (OT) Location – direct sunlight has a definite affect on sensor temperature reading.
The sensor white tube must be “shadowed” from direct sun rays.