Service and Parts Manual (2018, 2019, 2020, 2021, 2022)

91 PB
TROUBLESHOOTING
Check Heater Coil
The unit is equipped with a universal E-heater, which contains
two independent heating elements. Two limit switches are
incorporated into the heater assembly. The primary opens at
155°F and closes at 125°F. The secondary’s open temp is 200°F.They
can not be replaced independantly. If they are found to be faulty
the entire heater assembly must be replaced as a unit. The 9K
BTU unit incorporates a 2.5kW and a 1.0kW element. The 12K
BTU unit incorporates a 3.5kW and a 1.5kW element.
Gain Acces to Main PCB (logic) board
1. Remove front panel (Figure 501).
2. Remove User Interface (Figures 502 thru 504).
3. Open electrical Control Box (Figure 505)
4. Disconnect Red and Blue wires from the Heater relays (Figure
714)
5. Disconnect black wire from Power PCB (Figure 715)
Testing The Heating Element
Testing of the elements can be made with an ohmmeter across
the terminals after the 3 heater wires have been disconnected.
Readings should always been taken when coil is cold.
The 9K BTU unit incorporates a 2.5kW and 1.0kW heater coils.
1) Check 2.5 kW coil
Blue (HeaterCommon) to Black (Heater 1)
230v = 18.61 ohms +-3%
265v = 24.70 ohms +- 3%
2) Check 1.0 kW coil
Blue (HeaterCommon) to Red (Heater 2)
230v = 46.52 ohms +-3%
265v = 61.73 ohms +- 3%
The 12K BTU unit incorporates a 3.5kW and 1.5kW heater coils.
1) Check 3.5 kW coil
Blue (HeaterCommon) to Black (Heater 1)
230v = 13.29ohms +-3%
265v = 17.64 ohms +-3%
2) Check 1.5 kW coil
Blue (HeaterCommon) to Red (Heater 2)
230v = 31.01 ohms +-3%
265v = 41.76 ohms +-3%
If a reading is open or out of tolerance replace the heater
assembly.
Reconnect wires and operate heat to place elctric heater in demand-
See squence of operation for details.
Check 230/265v at output terminals on heater relays. If 230/265
volts is present and heater element does not toperate correctly,
replace heater assembly. If 230/265 volts in not present, proceed to
figure 717 (Check electric heater control)
Figure 716 (Check Heater Coil Resistance)
Figure 714 (Check Heater Coil Resistance)
Figure 715 (Check Heater Coil Resistance)
Figure 714