Tommy Heated Dryer Manual

Power ON
- Close Main Disconnect switch(s) (Overload and/or Disconnect)
- Power On light “LT-1” will illuminate
Safety Switch Interlocks
- Circuit Breaker “CB” must be in the ON position
- Tommy supplied relay must be energized and fuse intact
- Motor Starter Overload “OL1” must not be tripped
- Fan Motor Contactor coil “M1” will energize
- Fan Motor Contactor contact ‘M1’ will close
- Fan On light “LT-6” will illuminate
- Burner Enable Jumper remains installed between terminals 6 & 7
- High Temperature Limit ‘HTL’ switch must not be tripped
- HTL Closed light “LT-8” will illuminate
- Air Flow Switch ‘AFS’ will close
- AFS Closed light “LT-9” will illuminate
Burner Enable
- Fenwal Burner Control “FSG” will energize
- Safety and Blocking Gas Solenoid Valves will energize
- Modulating Gas Valve will energize (if High Fire switch is ON)
- Ignition Transformer of the “FSG” will energize to produce a spark at the Spark Igniter ‘SPK’
- Flame Detection Rod “FDR” senses flame, heater operates normally
Unit Off
- Tommy supplied relay contact opens
- Burner shuts off

1.2 – Shutdown Operation

Power OFF
- Main Disconnect in the OFF position (Overload and/or Disconnect)
- Tommy supplied Heated Dryer output relay is set to OFF on the controller

Section 2: Electrical

2.1 – Electrical Enclosure Parts Location

Figure 1 - Electrical Enclosure Parts Location

Item Number	Description	TCWS PN
1	Power Distribution Block	Factory Part
2	Fuses	P-HD-1022
3	Control Power Transformer	P-HD-1012
4	Motor Contactor	P-HD-1004
5	Overload Relay	P-HD-1005
6	Fenwal Direct Spark Ignition Control	P-HD-1011
7	6A Circuit Breaker	P-HD-1027
8	Relay base & relays	P-HD-1007 (base) P-HD-1006 (relay)
9	Diagnostic Panel	See Figure 2

2.2 – Diagnostic Panel

Item Number	Description	Function
1	High Fire Switch	If the switch is UP, the unit will be in High Fire mode. If the switch is DOWN, the unit will be in Low Fire mode.
2	Power ON	Light ON: 480v Transformer is powered and sending out 24vac
3	Fan ON	Light ON: Fan Motor Contactor is closed and fan is running
4	High Temp	Light ON: High Temperature Limit switch is not tripped
5	Air Flow	Light ON: Air Flow pressure is being met at the switch
6	Burner ON	Light ON: Fenwal Burner Control is powered and attempting to light burner
7	Burner Lockout	Light ON: Fenwal Burner Control fault. See pg. __ for fault indicators

Section 3: Gas

3.1 – External Gas Gauge Assembly

*Figure 7 - External Gas Gauge Assy (P-HD-1021)*

The heated dryer ships with an external ball valve with an incoming gas pressure gauge. This assembly (P-HD-1021) ships loose with the heated dryer. It should either be in a box or inside the gas train cabinet during shipment.

This assembly allows gas pressure to be shut off to the individual unit, as well as measure the incoming gas pressure to the unit. The pressure gauge has units of inches of water column (I.W.C or “ WC). This is a standard unit of measure for gas applications.

On the inside of the gas train cabinet door (lower cabinet), the incoming pressure requirements will be listed. The minimum gas pressure requirement is 8.5” W.C. The maximum incoming pressure is 1 psi or roughly 28” W.C.

3.2 – Gas Enclosure Parts Location

*Figure 3 - Gas Enclosure Parts Location*

Item Number	Description	TCWS PN
1	Internal Gas Regulator	P-HD-1000
2	Gas Solenoid Valves (2x)	P-HD-1020
3	Modulating Gas Valve	P-HYD-2171
4	Modulating Gas Actuator	P-HYD-2172
5	High Temp Limit Switch	P-HD-1010
6	Pressure Gauge -6” WC to +10” WC	P-HD-1013
7	Airflow Switch	P-HD-1008

3.3 – Burner Components (Bottom-Up View)

Item Number	Description	TCWS PN
1	Burner	P-HD-1014
2	Spark & Flame Rod Assembly (w/ mounting base)	P-HD-1009
2a	Spark Igniter (Brute style)	P-HD-1028
2b	Flame Rod	P-HD-1036
3	High Temp Limit Switch (w/ wire Probe)	P-HD-1010
4	Propeller (CW)	P-HD-1002 (behind burner)
5	3.0 HP Electric Motor	P-HD-1003 (cannot see in image – behind propeller)
6	Inlet Guard	P-HD-1019 (guard on inlet of drum)

3.4 – High Temperature Limit Switch

Figure 4 – High Temp Limit Switch w/ manual reset

Figure 5 – High Temp Limit Switch w/ Cover Off

Resetting the High Temperature Limit Switch:

The high temperature limit switch is a safety switch that will trip when the temperature of the heated dryer reaches the dial’s set point. This switch will prevent the Heated Dryer from overheating and causing damage.

If the switch trips, it will need to be reset in order for the Heated Dryer to operate properly again. To reset it, push the “Manual Reset” lever shown in Figure 4.

Adjusting the Set Point: Do Not Adjust the Dial Above 180°F.

To adjust the Temperature set point, remove the cover by taking out the “Removeable Screw” shown in Figure 4. Then, using a flathead-screwdriver, turn the brass screw of the “Temperature Dial”, shown in Figure 5, clockwise to increase the setpoint or counterclockwise to decrease the setpoint.

Section 4: High & Low Fire Adjusting

4.1– Adjusting Low Fire w/ Modulating Gas Actuator

Tools Required:

Small Flat-head Screwdriver or pick

Step 1:

Verify incoming gas pressure is between 8.5” W.C. and 28” W.C.
Open gas enclosure

Step 2:

Remove the Modulating Gas Actuator (MGA) by carefully pulling it off the Modulating Gas Valve (MGV).
Figure 1 – Modulating Gas Actuator Once off, record the current position of the clip before proceeding to adjust (Figure 2).
Then, turn the MGA around so the “Adaption” button is facing you.

Step 3:

With the small flat-head screwdriver, press the Adaption button for 1 second (Figure 3).
Turn the MGA back around so the adjustment clip is facing down towards you.

Step 4:

The modulating lever will move all the way to the right then back to the left.
Before the modulating lever moves back to the left towards ‘N’, carefully remove the adjustment clip using your fingernails, being careful not to drop the clip (Figure 4).

Step 5:

Adjusting the Clip:
- Setting the clip towards the ‘N’ will decrease the low fire gas pressure
- Setting the clip towards the ‘1’ will increase the low fire gas pressure
Ideal low fire gas pressure is 0.2”- 0.5” W.C. which can be achieved by setting the clip between the 4.5-6.5 marker (Figure 5). (Failure to set low fire between this range can cause inconsistent lighting)

Step 6:

After adjustments, set the clip back into place fitting it in the desired grooves so it is flush against the actuator, then push on the bottom end of the clip to lock it into place (Figure 6)

Step 7:

Once set, you can now reseat the actuator back onto the Modulating Gas Valve and test the unit for flame. The ideal flame length can be seen in (Figure 8)