Phoenix FireBird HD308 Operation manual

This appliance is equipped with a Blocked-Flue shutoff device. If any
part of the flue-gas passageway in the combustion chamber, exhaust
pipe or rain cap should become blocked or adversely restricted, a
pressure sensing switch (Fig.24 pg.10) will break the electrical control
circuit and not allow the burner to run. There is a “Manual Reset”
button on this switch that will have to be reset before re-firing can
occur. If the burner fails to start after resetting once, call a qualified
service technician to clean the flue passageways and/or replace the
switch. Cleaning instructions can be found in Section (6.1 G) of the
Maintenance section of this manual.
Owner’s Manual — FireBird HD308
Central Hydronic Heater
Installation, Operation & Service Instructions
Read and Save These Instructions
4201 Lien Rd. • Madison, WI 53704
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Specifications subject to change without notice.
TS-643 06/11
Designed and built for the rigors of the restoration industry, the Phoenix FireBird HD308 is the safest, most efficient, flexible,
and durable heat system made. The FireBird HD308 uses superior design to maximize heating capacity and minimize your
fuel cost, while its innovative safety features and system flexibility create revenue opportunities unavailable to competing
units.
The Phoenix FireBird HD308
• 308,000 BTU Capacity
• Atmospherically-Vented
• Stainless Steel and Aluminum Construction
• Diesel Powered
• Heavy Duty 1 HP Glycol Pump
• 120 Gallon Fuel Tank Capacity
Phoenix FireBird HD308
PN 4031010

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Table of Contents
1. System Description & Features..........................3
1.1 Description.................................................3
1.2 Features ....................................................3
2. Safety..............................................................4
2.1 General Safety Guidelines ...........................4
2.2 Safety Devices and Clearances ...................4
2.3 Heat Transfer Fluid .....................................5
3. Specications ..................................................5
3.1 Construction Specications .........................5
3.2 Dimensions & Capacities Chart ...................6
3.3 Oil Burner & Fuel Specications ...................6
3.4 Circulation Pump ........................................7
3.5 Electrical Requirements for Complete System8
3.6 Gauges & Indicator Lights ...........................8
3.7 Controls & Electrical ...................................9
3.8 Control, Switch, & Gauge Identication.......10
4. Setup ............................................................12
4.1 Positioning Equipment on the job...............12
4.2 Hose & Accessory Connections..................12
4.3 Charging the Fluid System .........................14
4.4 Oil Burner Installation & Setup...................15
5. Operation.......................................................15
5.1 Startup ....................................................15
5.2 Shutdown.................................................16
6. Maintenance ..................................................16
6.1 Service Instructions & Checks ...................16
6.2 Maintenance Frequency Chart....................20
7. Troubleshooting..............................................20
7.1 Fault Determination ..................................20
7.2 Burner Internal Faults................................22
7.3 Electrical Schematics................................23
Warranty ........................................................26
Serial No. __________________________________
Purchase Date ______________________________
Dealer’s Name ______________________________
Page 1. Specifications
Part No. 4031010
Fuel Input 308,000 BTU/hr
Fuel Options Diesel
Run Time at Full Load 50 Hours
Efficiency 85%
Heat Transfer Fluid Propylene Glycol
Pump 1 HP
Lifting Hook 1
Operating Temp Range -30°F to 140°F
Fluid Temperature 100°F to 200°F
Range
Fuel Tank Capacity 120 Gallons
Fuel Consumption
at Full Load 2.4 Gallons
Hydronic Flow Rate 30GPM/1.89 liters per sec
Hydronic Connections 1” ISO 7241 Series B Couplings
Dimensions 72”L x 31”W x 48”H - inches
1829L x 787W x 1219H - millimeters
(Cabinet with Fuel Tank)
Weight 800 lbs. / 363 kg (Empty Fuel Tank)
1700 lbs. / 771 kg (Full Fuel Tank)

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2. System Description &
Features
2.1 Description
• The HD308 is a fuel burning appliance, designed
to heat fluid “on demand” and provide pumped
circulation of the fluid for use in various portable
hydronic applications.
• The HD308 provides a central source of hot “heat
transfer uid” (HTF) for use with dependent heat
exchangers such as:
- Fan coils for heating and drying of structures.
- Multi-circuit line heat exchange hose or tubing for
ground thawing, concrete curing, snow melting and
slab heating.
- Custom hydronic heat exchange accessories and
applications.
• The HD308 oil-red is designed to burn #1 or #2 light
diesel fuel or heating oil.
• Pumping and combustion control are achieved with
electrical components. The FireBird HD308 requires a
120 volt, 20 amp, 3-wire grounding circuit.
• The HD308 is designed for consistently-efcient
outdoor operation.
2.2 Features
• All exposed components are made of non-corrosive
materials such as stainless steel, brass or aluminum.
• The “HTF” circuit includes an open, atmospherically-
vented expansion tank, which effectively eliminates
the system from pressure vessel classification.
• The control system includes a sequence of status
indicator lights which provide a quick function check
and trouble-shooting aid for the operator.
• The combustion chamber/heat exchanger is
2: FireBird HD308, Burner End1: FireBird HD308, Pump End
completely fabricated from stainless steel and is not
susceptible to corrosion. Temperature turn-down for
prolonged periods of operation (such as for concrete
curing) will not harm the chamber.
• For security and environmental protection, all valves,
controls, burner, pump, lters, “HTF”tank ller and fuel
tank filler are either secured behind lockable access
doors or are self-lockable.
• An electric “Pre-heater” ensures continued clean
lighting and combustion of diesel/light oil, even in the
coldest of climatic conditions.
• Temperature gauges, pressure gauge, system status
indicator lights, “HTF” tank level gauge and fuel tank
level gauge are visible to the operator even when the
system is securely locked down.
• The CSA/UL approved burner, comes with a
permanently installed pressure gauge to simplify
adjustment of fuel pressure when setting up the
burner.
• Door handles and hose connection couplers for the
external HTF circuit are recessed so as not to create
“snag-points” when moving, shipping or delivering the
unit.
3. Safety
3.1 General Safety Guidelines:
CAUTION! This is a fuel burning appliance.
• Some surfaces will become EXTREMELY HOT!
• When using the fuel oil the chance of FIRE or
EXPLOSION always exists! Always follow safe-
operating practices and comply with local fire and fuel
handling codes.
• Before attempting to setup or operate this equipment,
it is imperative that the operator reads and
understands all the information in this manual.
• Untrained people should not attempt to operate this
equipment until they receive proper instruction.
• Maintain instructional and safety labels. Replace
damaged labels.
• Observe all posted warnings and cautions.
• Always wear suitable protective clothing and
accessories such as safety glasses, leather gloves,
certified work boots and hard hat when working with or
operating this equipment.
• Keep children, pets and all untrained bystanders clear
from the heater and accessories.

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3.2 Safety Devices and Clearances
• All safety devices must be in place and functioning
properly when the equipment is in operation.
• All hydronic heater panels and doors must be kept
closed when the system is operating.
• The flue-gas exhaust pipe and rain-cap requires a
minimum of 6” (152 mm) clearance, from any type of
combustible material.
• Clearance from any obstructive objects must be
maintained to a minimum of 36” (914 mm) from both
ends of the Hydronic Heater.
• Do not allow anything to obstruct the “combustion air
intake”.
3.3 Heat Transfer Fluid
Precautions and measures to follow when working with
“heat transfer uid” (Inhibited aqueous propylene glycol).
• Ventilation - Good general ventilation should be
sufficient for most conditions.
• Respiratory protection - No respiratory protection
should be needed.
• Skin protection - For brief contact, no precautions
other than clean body-covering clothing should be
needed.
• Use impervious gloves when prolonged or frequently
repeated contact should occur.
• Eye protection - Use safety glasses.
First aid measures.
• Eyes - Flush eyes with plenty of water.
• Skin - Wash off in owing water or shower.
• Ingestion - Induce vomiting if large amounts are
ingested. Consult medical personnel.
• Inhalation - Remove to fresh air if effects occur.
Consult a physician.
• Note to physician - No specific antidote. Supportive
care. Treatment based on judgement of the physician
in response to reactions of the patient.
4 Specifications
4.1 Construction Specications
• The HD308 includes an aluminum “enviro-
containment” base, with fork-lift pockets.
Length of Cabinet inches (millimeters) 72 (1829)
Width of Cabinet inches (millimeters) 22 (559)
Width of Fuel Tank inches (millimeters) 31 (787)
Height of Cabinet inches (millimeters) 48 (1219)
Height of Top of Rain Cap inches (millimeters) 58 (1473)
Heat Transfer Fluid Capacity US gallons (liters) 20 (76)
Fuel Tank Capacity US gallons (liters) 116 (439)
Weight without Fuel Tank pounds (kilograms) 600 (272)
Weight with Fuel Tank Empty pounds (kilograms) 800 (363)
Weight with Fuel Tank Full pounds (kilograms) 1700 (771)
• The exterior enclosure panels are made of stainless
steel.
• The framework for the enclosure and the base are built
of structural aluminum. A top center hoisting hook is
included.
• Primary access for operation and service is provided
for through hinged, lockable doors at the two ends of
the enclosure.
• Both side panels and both roof panels are fastener-
attached for potential removal.
• Then combustion chamber/heat exchange section is
fabricated from stainless steel.
• Access for cleaning the chamber is from the burner
end with minimal disassembly required. The procedure
consists of removing the burner and inside chamber
section.
• Temperature turn-down and condensing within the
chamber can not harm the chamber.
• The exhaust flue for the burner exits through the roof
of the enclosure. The exposed roof flashing is made
from aluminum. The rain cap and flue pipe are made of
stainless steel.
4.2 Dimensions and Capacities
4.3 Oil Burner and Fuel Specifications (Fig. 3)
• The “oil burner” is a pressure-atomization type with
direct spark ignition.
• #1 or #2 light heating oil or diesel fuel may be used.
• A gauge is connected to a pressure-tap port on the
fuel pump of the burner to aid in setting the burner
and monitoring performance (Fig. 26).
• A fuel lter is mounted inside the enclosure (Fig.4).
• Supply and return fuel lines are equipped with quick
couplers for ease of connection to a fuel tank.

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4.4 Circulation Pump (Fig. 6)
• The HTF circulation pump is a stainless steel, direct
drive centrifugal type.
• The pump is located inside the enclosure at the
opposite end of the burner and can be accessed
through a hinged lockable door (Fig. 1).
• A panel-mounted pressure gauge is connected to the
output side of the HTF pump by means of a 1/8” ID
hydraulic hose and ttings (Fig. 25).
4.5 Electrical Requirements for Complete
System
4.6 Gauges and Indicator Lights
• A cluster of gauges and status-indicator lights are
located inside the UL approved control panel. This
panel is located behind the burner access door near
the top (Fig. 2). These gauges and lights are visible
from the exterior through plexi-glass windows in the
access door and the control panel door.
• A digital gauge (Fig. 14) monitors each of the following:
- HTF supply temperature.
- HTF return temperature.
• A digital hours meter (Fig. 14) logs system run-time.
• A series of 6, LED indicator lights (Fig. 15) illuminate
in sequence as each of the following scenarios is
proven:
- #1 - 120 volt control power is present - clear lens.
- #2 - HTF level is adequate in reservoir - green lens.
- #3 - Flow switch has proven adequate ow of HTF
in the system - green lens.
- #4 - High limit control has not interrupted the
circuit - green lens.
- #5 - High pressure switch has not interrupted the
circuit - green lens.
- #6 - Aquastat is calling for heat - green lens.
Burner Specifications
Operational Mode single stage
Electrical Characteristics V/A/Hz/Ph 120/2.0/60/1
Nozzle 1.65-60°B
Fuel Pump Pressure: factory setting PSI (kilopascals) 180 (1241)
Turbulator Head: factory setting # 3.0
Air Gate: factory setting # 4.2
Fuel Input Rate: factory setting USGPH (liters/hr) 2.2 (8.3)
Heat Input: based on 140,00 Btu per USG Btu/H (Watts) 308,000 (90,244)
Heat Output @ 80% net efficiency Btu/H (Watts) 246,400 (72,195)
3: Oil/Diesel Burner 4: Fuel Filter & Valve
HTF Pump Specifications
Motor Horsepower HP (Watts) 1.0 (746)
Voltage Volts 120/240
Full Load Amp Rating Amps 12.3/6.2
System Design Flow Rate USGPM (liters/sec) 30 (1.89)
System Design Operating Pressure PSI (kilopascals) 35 (241
Supply Voltage Volts 120
Circuit Amperage Amps 20
Hertz HZ 60
Phase PH single
Control Circuit Voltage Volts 120
Power Inlet - NEMA Twistlock L520P
6: Fluid circulation Pump
7: Power Inlet Plug

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4.7 Controls and Electrical
• The UL approved electrical box, located inside the
enclosure, above the burner, houses specific electrical
components, besides the lights and gauges, and
serves as a junction box for cords going to and from
remote electrical components (Fig. 8 & Fig. 9).
• The following components are part of and are located
in the UL approved box:
- Main power disconnect (Fig. 11).
- Pump ON/OFF switch (Fig. 12).
- Burner circuit ON/OFF switch (Fig. 13).
- Main system breaker (Fig. 16).
- Pump circuit breaker (Fig. 16).
- Burner circuit breaker (Fig. 16).
- Power disconnect switch (Fig. 17).
- Temperature gauge transformers 6VDC (Fig. 18).
- LED lights - 120 volt (Fig. 15).
- Hours meter - 120 volt (Fig. 14).
- Terminal blocks (Fig. 20).
- Contactors (Fig. 19).
- Electronic operating controller (Fig. 10).
• The following items are remotely connected to cords
that exit from the control panel: (see chart below for
details of these components)
- Main power male inlet-plug (twist lock) (Fig. 7).
- Low water cut-off switch (mounted on HTF
reservoir) (Fig. 21).
- Flow switch (mounted in HTF plumbing circuit) (Fig.
22).
- High limit switch (mounted in HTF plumbing circuit)
(Fig. 23).
- High pressure switch (Fig. 24).
- Diesel fuel pre-heater (Fig. 5).
- HTF circulating pump (Fig. 6). (see pump chart
above for details)
- Burner (Fig. 3). (see burner chart above for details)
3.8 Control, Switch & Gauge Identication
• Mounted on Control Panel
• Mounted Behind Control Panel
8: Control Panel, Outer 9: Control Panel, Inner
Volts Rating Amps Rating NEMA Approvals
Control Panel and Contents 125VAC 20 4X UL
Inlet Plug 125VAC 20A-1HP L5-20P UL/CSA
Lo-water Cutoff 120VAC 5.8 FLA N/A UL/CSA
Hi-limit Switch 120VAC 8.0 FLA N/A UL/CSA
Flow Switch 120VAC 7.4 N/A UL/CSA/CE
High Pressure Switch 120VAC 300VA N/A UL/CSA
Fuel Heater 120VAC 0.77 N/A UL
10: Operator, Digital 11: Main Power
Switch Knob
12: Pump
Switch
13: Burner
Switch
14: Temperature Gauges
& Hour Meter
15: LED Indicator Lights
16: Circuit
Breakers
17: Main Power
Switch Body
18: Transformers for
Digital Temp. Gauges
19: Contactors 20: Terminal Blocks

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5.2 Hose and Accessory Connections
In order to make use of the heated fluid, it is necessary
to lay out a circuit of hoses to; distribute the hot fluid,
transfer it’s heat to another medium and return the cooled
uid to the HD308 for re-heating (Fig. 27).
• Primary 1” hoses are used from the HD308 quick-
connect couplings (Fig. 28) to feed a manifold for
either multiple fancoils in air heating situations (Fig.
30) or multiple 5/8” hose circuits for ground thawing,
concrete curing, slab heating or snow melting (Fig. 31).
• Use only “approved hose” as supplied by ThermaStor.
Otherwise, compatibility issues may arise.
• Hoses are pre-charged with the recommended mixture
of water and propylene glycol and are equipped with
hydraulic-style quick couplers. Every hose has a male
connector on one end and a female connector on the
other end; therefore any hose can be used for either
the supply side or the return side of the hose circuit.
• Route hoses to achieve minimum chance of damage
from traffic of any kind and at the same time minimize
the overall circuit length.
• Provide protection from “Kinking” of hoses that would
restrict flow.
• When connecting Quick couplers, ensure that the
connections are “fully engaged” and snapped into
place or flow will not take place through the coupler
connection.
• For longer term, building heating projects it is advised
to insulate all hose sections located outdoors,
between the FireBird HD308 and the exterior building
wall. Special “insulating wraps” are available for this
purpose.
• Mounted Remotely on Plumbing Circuit
• Pump and Burner Pressure Gauges
5. Setup
5.1 Positioning Equipment on the Job
Before choosing the location to place the central hydronic
heater on a job site, several factors should be considered.
• If possible, the HD308 should be placed at a central
position that will minimize and equalize the lengths of
hoses. This helps to ensure maximized and equalized
HTF ow.
• Convenient access to a suitable electrical connection,
if site power is to be used. 120V, 1PH, 60Hz, 20A,
3-wire grounding is required.
• Convenient access to bulk truck re-fueling.
• Do not locate in the path of job site trafc.
• Avoid locations that will expose the HD308 to intense
dust or other sources of air contamination. Clean
flowing air is essential to maintain clean combustion.
• Observe all requirements listed in the “Instructions for
Installation” document provided with this unit.
21: Low Water Cutoff 22: Flow Switch
23: High Temp Limit
Switch
24: High Pressure
Switch
25: Pump Pressure
Gauge (PSI)
26: Fuel Oil Pressure
Gauge (PSI)

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5.3 Charging the Fluid System
• The FireBird HD308, all hose and all accessories are
shipped pre-charged with the “approved blend” of
heat transfer uid (HTF). The required uid is a 50%
blend of Inhibited propylene glycol and de-mineralized
neutral PH (#7)water. This provides freeze protection
to -29ºF (-34ºC). The HTF provided with a new system
and accessories is marketed as DowFrost. Use of any
other product that cannot be proven to be equal in all
respects will void warranty of the system.
• Check the HTF level gauge (Fig. 32). The reservoir
should be 1/4 to 1/2 full when the system is cold.
Add approved uid, if necessary, at the vented ller
cap (Fig. 32).
• Connect all primary hoses from the FireBird HD308 to
the distribution manifold.
• Place all fancoils in the desired locations and route all
the hoses to them OR lay out all hose grid circuits for
ground thaw or concrete curing.
• Connect hoses from the manifold to ONE fancoil ONLY.
• Open 2 HTF circuit valves (Fig. 33).Turn ON the
circulating pump switch (Fig. 12) and let the fluid
circulate until all the air is eliminated from the first
branch circuit. Air has been purged when steady
pressure of 30 to 35 PSI is observed at the glycol
pressure gauge (Fig. 25).
27: Layout for Fluid Distribution
1. Central Hydronic Heating Unit
2. Burner& Heat Exchanger
3. Circulating Pump
4. Reservoir for Expansion & Filling
5. Primary Fluid Hoses, 1”
6. Secondary Fluid Hoses, 3/4” or 1”
7. Manifold for Multiple Connections
8. Fancoil Heat Exchanger
9. Heat Transfer Coil
10. Air Moving Fan
11. Heated Supply Air
12. Intake Air
29: Fancoil Connected to
HD308 Unit
28: Hoses Connected to
HD308 Unit
30: Manifolds for Fancoils - Supply & Return
32: HTF Level Gauge & Vented Filler Cap
33: HTF Circuit Valves, Y-strainer
& High Temp. Limit

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• Connect each fancoil or thaw/cure loop, in turn, one
at a time, in the same manner as above. When all are
connected and the pressure gauge maintains steady
pressure, the system is charged and ready for use.
• Check the HTF level again and top up if necessary 1/4
to 1/2 full).
5.4 Oil Burner Installation and Setup (Fig. 3)
• Specic burner settings for the FireBird HD308 are as
follows.
6. Operation
6.1 Startup
• Make sure the FireBird HD308 is connected to a
correct, stable power source (120V, 20A, 60Hz, 3-wire
grounding) and proper gauge chords are used (12
gauge minimum).
• Verify adequate and correct fuel supply for the burner
(#1 or #2 light oil or diesel). Open all valves in the
fuel-supply lines.
• Make sure at least one circuit of HTF hose is
connected to the FireBird HD308 to provide adequate
circulation to trigger the flow switch (see hose and
accessory connections section).
• At the control panel (Fig. 8), remove 2 thumb screws
to open and expose the inner panel (Fig. 9), turn ON
the three breakers located behind the light panel (Fig.
16). Close and refasten the panel.
• Turn ON the main power switch (Fig. 11). The white
unit power light (Fig. 15) will come on, as well as the
two digital temperature gauges and hour meter (Fig.
14).
• Turn ON the pump switch (Fig. 12) and check the
pump pressure gauge (Fig. 25). Steady pressure
around (30 to 35 PSI), indicates that no air remains in
the fluid circuit.
• Once a stable pump pressure is achieved, turn ON the
burner switch (Fig. 13). The following sequence should
now occur: Observe the LED light cluster (Fig. 15).
- The glycol level light will turn on (indicating that
there is a sufcient amount of HTF in the system).
- The glycol flow light will turn on (indicating that
there is enough flow for the system to operate).
- The high temp limit light will turn on. (This
indicates that the high limit safety switch has not
broken the circuit).
- The high pressure switch light will turn on. (This
indicates that the blocked flue high pressure
safety switch has not broken the circuit).
- A few seconds later, the stat light will come on
and the burner fan will purge the combustion
chamber for a few seconds.
- The burner should light following the pre-purge. If
air is still present in the fuel lines, the burner may
not light and lock out. It might be necessary to
push the red reset button on the burner module 2
or 3 times until fuel reaches the burner head and
ignition takes place.
• Make sure the operator (Fig. 10) is set at the desired
temperature. DO NOT operate at temperatures above
200ºF, or damage to inline controls and certain
accessory components can result. To adjust setpoint
on this control just use the up and down key. There
is no need to go into the menu of the control to
perform this function. The control simultaneously
displays setpoint temperature and actual supply fluid
temperature.
• Once the setpoint temperature has been reached, the
burner will cycle off and on as needed.
5.2 Shutdown
• Turn OFF the burner switch (Fig. 13). The burner will no
longer recycle but the circulation pump will continue to
run.
• It is recommended that the fluid be allowed to
continue circulating until it has cooled down to 100ºF
(38ºC) or lower.
• Turn OFF the pump switch (Fig. 12). If any fancoils
and hoses have been placed at a higher elevation
than the FireBird HD308, the primary hoses should be
immediately disconnected from the FireBird HD308
(Fig. 28). This will prevent fluid from draining back and
overowing at the HTF reservoir vent (Fig. 32).
• Turn OFF the main power switch (Fig. 11).
• Turn OFF fuel supply valves.
• If the system is to be de-commissioned, it is now safe
to disconnect the power supply, and all HTF circulation
hoses, manifolds and accessories.
Fuel Pump Pressure: factory setting PSI (kilopascals) 180 (1241)
Turbulator Head: factory setting # 3.0
Air Gate: factory setting # 4.2
Fuel Input Rate: factory setting USGPH (liters/Hr) 2.2 (8.3)
Heat Input: based on 140,000 Btu per USG Btu/H (Watts) 308,000 (90,244)
Heat Output: @ 80% net efficiency Btu/H (Watts) 246,400 (72,195)

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6. Maintenance
6.1 Service Instructions and Checks
“CAUTION: Label all wires prior to
disconnection when servicing controls. Wiring
errors can cause improper and dangerous
operation. Verify proper operation after burner
adjustment and servicing
A. To achieve and ensure clean combustion from the
burner, a “flue-gas analyzer” and “smoke spot tester”
must be used to verify clean combustion. Perform the
following checks while the burner is firing. Must be
performed by a trained service technician ONLY. These
checks should be performed, every time, when putting the
system into operation on a new project and a minimum of
once yearly.
a. Before starting the burner, determine that the
combustion head is set at 3.0 and the correct nozzle
is in place (Delavan 1.65-60ºB).
b. Fire the burner and ensure that the oil pressure is
at 180 PSI. Adjust if necessary.
c. Regulation of combustion air flow is made by
adjustment of the manual AIR ADJUSTMENT PLATE.
Initial suggested setting is (4.2).
d. Final position of the air adjustment plate must be
set based on instrument readings of not greater than
13.0% CO2 and a smoke spot reading of zero. Final
readings must be taken with all service-access doors
closed.
B. After placing this unit in operation, the ignition system
safety shutoff device must be tested. Must be performed
by a trained service technician ONLY. Refer to the Riello
manual, 40-F10 for burner component identification and
further instructions. This check should be performed, every
time, when putting the system into operation on a new
project or a minimum of once yearly.
a. Shut OFF the “burner circuit” power switch.
b. Remove the primary control box from the burner
and place a small piece of dark tape over the light-
sensing, cad-cell eye that senses the presence of
ame in the combustion chamber. Put the primary
control back in place.
c. Turn the power switch back ON and initiate burner
lighting procedure. After the short pre-purge cycle, the
burner should light but go out in 5 seconds and lock
out. If the burner does not lock out with the cad-cell
eye covered, the primary control should be replaced.
d. To put the unit back in standard operating mode,
turn OFF the burner circuit power switch, remove the
tape-cover from the burner’s primary control box,
re-insert the control and turn ON the “burner circuit”
power switch.
C. Examine the ue gas exhaust pipe and rain cap to be
sure they are solidly attached and free from any type of
obstruction. Clean if necessary.
a. This check should be performed, every time, when
putting the system into operation on a new project or a
minimum of once yearly.
D. After placing this unit in operation, the low water
safety shutoff device must be tested. Must be performed
by a trained service technician ONLY. The low water cutoff
switch is located in plain view at the same end of the
FireBird HD308 as the circulating pump and is identied
with a label.
a. Push the test switch on the outside of the control.
This will simulate a “low water” condition and open the
burner circuit to prevent burner initiation.
b. By pushing the reset switch, the control will
restore function to the burner circuit as long as there
is fluid touching the probe. The electronic probe is a
“self cleaning” type and should not require service.
c. This control should be tested every time, when
putting the system into operation on a new project or a
minimum of once yearly.
E. After placing this unit in operation, the high
temperature limit safety shutoff device must be tested.
Must be performed by a trained service technician ONLY.
The high temperature limit switch is located in plain view
at the same end of the FireBird HD308 as the circulating
pump and is identified with a label.
a. With the burner ring, set the digital operating
control to a temperature value that is at least 5ºF
higher than the setpoint of the high temperature limit
switch.
b. When the uid temperature reaches the level of
the high limit setpoint, it should shut down the burner.
c. The high limit will need to be manually re-set, by
pushing the red re-set button to return to the operating
mode. Adjust the operator back down to the lower
setting.
d. This control should be tested every time, when
putting the system into operation on a new project or a
minimum of once yearly.
F. After placing this unit in operation, the high pressure
safety shutoff (blocked-flue) device must be tested. Must
be performed by a trained service technician ONLY. The
high pressure cutoff switch is located just below and to the
left of the burner and is identified with a label.

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a. Remove the chimney rain cap.
b. With the burner ring, cover the chimney ue pipe
so it is blocked off completely. This should cause the
pressure switch contacts to open and shut down the
burner.
c. Remove the cover from the pipe and replace the
rain cap. The burner should not try to re-light since the
switch must be manually re-set.
d. By pushing the reset button (located under the
electrical box cover of the pressure switch), the control
will reset and the burner should light again.
e. This control should be tested every time, when
putting the system into operation on a new project or a
minimum of once yearly.
G. Procedure for cleaning ue gas passageways. This
procedure should be performed in the event of blockage in
the flue gas passage due to soot or any other obstruction
that may occur. Improper burner settings or maintenance
could cause soot accumulation in the combustion
chamber. The following steps should be taken to clean out
the chamber flue gas passageway. Must be performed by a
trained service technician ONLY.
a. Shut off and disconnect external electrical power
supply.
b. Drain the heat transfer fluid from the system.
c. Exterior cabinet side panels and the cabinet
door & framing members, at the burner end of the
cabinet, should be removed, to facilitate access to
the combustion chamber. The control panel should
be loosened from its mounting frame. These are all
bolt-on components.
d. Once access to the chamber has been gained,
disconnect the burner electrical supply line and
fuel supply line and remove the burner. Two bolts
will need to be removed that hold the burner to its
mounting flange.
e. Disconnect the flue gas vent pipe by removing
screws. Remove the pipe and rain cap assembly and
clean its interior thoroughly.
f. The two hoses are connected to 1” fittings that
protrude through the front flange plate disk of the
combustion chamber. These hoses will need to be
disconnected by loosening the hose clamps and
pulling the hose off the insert barbs.
g. Remove 8 bolts that hold the chamber flange plate
disk to the main chamber body.
h. The inner section of the combustion chamber can
now be pulled straight out of the main chamber body.
All ue gas contact surfaces are now exposed and
can be easily cleaned with vacuum cleaner, brushes
or other cleaning utensils.
i. To re-assemble the unit, replace components in
reverse order to which they were removed.
j. Reconnect fuel and power supply to the unit and
when re-starting the system perform all safety and
service checks as outlined above.
H. The FireBird HD308 will produce condensate while
operating, at any time that the circulating fluid is cooler
than approximately 130ºF (54ºC). A clear poly-tube is
connected to a fitting in the bottom of the chamber at
front and is routed to the outside of the cabinet to carry
condensate away. This tube should be inspected and
cleaned, if necessary, when putting the system into
operation on every new project or a minimum of once
yearly.
I. On a daily basis, the area around this system must
continue to be kept clear and free from combustible
materials, gasoline and all other flammable vapors and
liquids.
J. At the circulation pump end of the FireBird HD308
cabinet, louvers are stamped into the access door to
provide intake air for combustion and ventilation. Check on
a daily basis to ensure that nothing is allowed to obstruct
this free-flow of air.
K. Check heat transfer fluid level daily. Maintain between
¼ and ¾ level during normal operation. If excessive fluid
loss occurs check all hoses and connections for leaks.
Top-up only with approved HTF. (see section 4.3 for
details).
L. Verify that all gauges are maintaining within their
desired operating ranges with respect to setpoint.
M. Check fuel tank level daily and order fuel as required.
N. Make sure that all access doors and panels are kept
closed and locked while the system is in use.
O. If fluid-flow should become reduced, as indicated by
the flow light going out and burner not starting, isolate and
clean the Y-strainer. To clean the Y-strainer (Fig. 33): The
ball valve immediately to the left of the Y-strainer must
be closed and the quick-coupler connection immediately
to the right (on the outside of the cabinet) must be
disconnected. This will isolate the Y-strainer. The cap on
the Y-branch can now be removed so the cylindrical screen
can also be removed. Clean the screen with compressed
air or a small wire brush. Put the screen back in place and
re-engage the cap, quick coupler connection and valve.
For further service assistance
Call the manufacturer toll free at: 1-800-533-7533
OR
Call to speak to an hydronic service specialist direct
at: 1-306-921-5227

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6.2 Maintenance Frequency Chart
7. Troubleshooting
7.1 Fault Determination
The FireBird HD308 is equipped with a group of LED
“indicator lights”. The purpose of these lights is to aid in
determining where the fault lies if the heating unit should
fail to function properly. The following sequence explains
the function each light represents and what to look for if
that function fails:
If all switches have been turned ON and the system has
been operating but has now FAILED, the status of these 6
lights will help to isolate the problem.
All Lights OFF indicates.
A. NO power through the main power switch. Check the
following:
a. Is main power switch (Fig.11) still turned on?
b. Are the circuit breakers (Fig. 16) still turned on?
c. Verify external power supply (120V) to inlet plug
(Fig. 7).
#1 Unit Power Light is ON indicates.
A. Power is present through main switch. The 2 digital
temperature gauges should be ON. If not, use a multi-
meter to check the following:
a. The 2 transformers (Fig. 18) should show 120VAC
in and 6VDC out. If power goes in but not out, replace
transformer.
b. If there is 6VDC at the digital gauge but it does
not illuminate, replace the temp. gauge.
B. There is no power going through the low water cutoff
(LWCO) switch (Fig. 21).
a. Check fluid level in reservoir. Should be at least ¼
level. Add if necessary.
b. Check, with a multi-meter, for 120V in and out of
LWCO switch. If uid is adequate and there is power in
but not out, replace the LWCO switch.
MAINTENANCE TASKS

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#2 Glycol Level Light, (plus #1) are ON indicates.
A. LWCO switch (Fig. 21) is sensing sufcient glycol in
the reservoir and power is going through the switch.
B. There is no power going through the glycol flow switch
(Fig. 22). Check the following:
a. Is the pump (Fig. 6) still running? If not; Check
for 120 volts to the pump. If power is present but the
pump isn’t running, replace the pump.
b. Are all glycol circuit valves still open?
c. Are at least 1 fancoil or 2 ground thaw loops still
hooked up?
d. Check Y-strainer (Fig. 33) and clean if necessary.
e. Check all hoses for kinks or other restrictions.
f. Check that all quick couplers are fully engaged
and have snapped into position.
g. Check, with a multi-meter, for 120V in and out of
glycol flow switch (Fig. 22). If there is power in but not
out, replace the flow switch.
#3 Glycol Flow Light, (plus #1 & #2) are ON indicates.
A. Glycol flow switch (Fig. 22) is sensing sufficient flow
and power is going through the switch.
B. There is no power going through the high temperature
limit switch (Fig. 23).
a. Check the setpoints on the high temperature
limit switch (Fig. 23) and digital operator (Fig. 10). If
these 2 set points are too close to the same, the high
limit temperature setting may have been reached and
the switch will be locked out. It will be necessary to
push the manual reset button on the front of the high
temperature limit switch and check the setpoints of
both the high limit switch (maximum 210ºF) and the
digital operator (maximum 10ºF lower than the high
limit).
b. With the high limit re-set and actual uid
temperature well below the setpoint of both controls,
check, with a multi-meter, for 120V in and out of the
high temperature limit switch (Fig. 23). If there is
power in but not out, replace the limit switch.
#4 High Temp. Limit Light, (plus #1, #2 & #3) are ON
indicates.
A. Actual supply uid temperature has not reached the
high temperature limit setpoint and power is going through
the switch.
B. There is no power going through the NC contacts of
the high pressure switch (Fig. 24). Blockage may have
occurred in the flue gas passage way.
a. Check the chimney pipe and rain cap for blockage.
b. Check the air tube connection to the pressure
switch and clean if necessary.
c. Clean the flue gas passages in the combustion
chamber (see Maintenance Section 6.1 G for
instructions)
d. Push the manual reset button on the pressure
switch and the circuit should be restored. If not
replace the switch.
#5 High Pressure Switch Light, (plus #1, #2, #3 & #4)
are ON indicates.
A. Pressure in the combustion chamber and ue pipe
has not risen above the high limit cutoff point. power is
going through the NC contacts of the high pressure switch
(Fig. 24). Indicates no blockage in any of the flue gas
passages.
B. There is no power going through the digital operator
switch contacts (Fig. 10).
a. The actual supply fluid temperature may have
risen high enough that the Operator has cycled off. A
call-for-heat will be re-established once the Supply fluid
temperature has dropped to 5ºF below setpoint.
b. If the actual supply fluid temperature is well below
the setpoint of the operator (at least 10ºF lower),
check, with a multi-meter, for 120V in and out of the
operator. If there is power in but not out, replace the
operator and it’s sensor.
#6 Stat Light, (plus #1, #2, #3, #4 & #5) are ON
indicates.
A. The digital operator (Fig. 10) is calling for heat. The
burner should be engaged.
B. If the burner is not functioning, a fault lies within the
burner.
7.2 Burner Internal Faults
Diesel/Light Oil Burner
Below is a list of scenarios and possible causes for burner
failure.
A. The burner goes through the prepurge period normally.
The flame ignites, but the burner goes to lockout within
five seconds.
a. The phase/neutral lines are reversed. Correct
polarity is critical.
b. The wiring to ground is absent or ineffective.
c. The electric eye, light-sensing switch is dirty or
defective. Try cleaning the eye. If it still fails, replace
it.

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B. The burner goes to lockout after the prepurge period
because the flame does not ignite.
a. No fuel in tank or lines.
b. Air has not been fully bled from the fuel lines.
c. The fuel filter is dirty. Replace filter.
d. Nozzle is plugged. Replace nozzle.
e. The spark is irregular or not present. Re-align
electrodes.
C. The burner does not start when the thermostat calls
for heat.
a. Loose wire connection at terminals L or N.
b. Terminals on the control module are bent or loose.
c. The motor is defective.
d. The capacitor is defective.
e. The control box is defective.
7.3 Electrical Schematics

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Burner Wiring:
Line Voltage: Sub-base Wiring:

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8. Service Parts
Item Description Part No.
1 HTF Pump 4030271
2 Low HTF Cutoff 4030276
3 Flow Switch 4030277
4 High Temp Limit Switch 4030275
5 High Pressure Switch 4030663
6 Pump Pressure Gauge 4030305
7 Fuel Pressure Gauge 4030304
8 Burner Nozzle 4030551
9 Burner Assembly 4030272
10 Igniter 4030302
5 Options and Accessories
4029790 Phoenix TX 80 Fan Coil
4030700 Manifold Kit (2 ea.)
4030153 3/4” x 50’ Hose
4030417 3/4” x 25’ Hose
4030418 3/4” x 15’ Hose
4030154 1” x 50’ Hose
4029876 Ductable Filter Box Kit
4021799 16” x 16” x 2” Merv-8 Filter
4028363 16” x 25’ Heavy Duty Flex Duct
4024936 14” x 250’ Lay Flat Duct
4029423 Glycol

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FireBird HD308 Limited Warranty
Phoenix FireBird HD308 Limited Warranty
Warrantor:
Therma-Stor LLC
4201 Lien Rd.
Madison, WI 53704
Telephone: [phone]
Who Is Covered: This warranty extends only to the original end-user of the Phoenix FireBird HD308 and
may not be assigned or transferred.
One Year Warranty: Therma-Stor LLC warrants that, for one (1) year the Phoenix FireBird HD308 will
operate free from any defects in materials and workmanship, or Therma-Stor LLC will, at its option,
repair or replace the defective part(s), free of any charge.
End-User Responsibilities: Warranty service must be performed by a Servicer authorized by Therma-
Stor LLC. If the end-user is unable to locate or obtain warranty service from an authorized Servicer,
the end-user should call Therma-Stor LLC at the above number and ask for the Therma-Stor Service
Department., which will then arrange for covered warranty service. Warranty service will be performed
during normal working hours.
The end-user must present proof of purchase (lease) upon request, by use of the warranty card or
other reasonable and reliable means. The end-user is responsible for normal care. This warranty does
not cover any defect, malfunction, etc. resulting from misuse, abuse, lack of normal care, corrosion,
freezing, tampering, modification, unauthorized or improper repair or installation, accident, acts of
nature or any other cause beyond Therma-Stor LLC’ reasonable control.
Limitations and Exclusions: If any Phoenix FireBird HD308 part is repaired or replaced, the new
part shall be warranted for only the remainder of the original warranty period applicable thereto (but
all warranty periods will be extended by the period of time, if any, that the Phoenix FireBird HD308
Desiccant Dehumidifier is out of service while awaiting covered warranty service).
UPON THE EXPIRATION OF THE WRITTEN WARRANTY APPLICABLE TO THE PHOENIX FIREBIRD HD308
OR ANY PART THEREOF, ALL OTHER WARRANTIES IMPLIED BY LAW, INCLUDING MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE, SHALL ALSO EXPIRE. ALL WARRANTIES MADE BY THERMA-
STOR LLC ARE SET FORTH HEREIN, AND NO CLAIM MAY BE MADE AGAINST THERMA-STOR LLC BASED
ON ANY ORAL WARRANTY. IN NO EVENT SHALL THERMA-STOR LLC, IN CONNECTION WITH THE SALE,
INSTALLATION, USE, REPAIR OR REPLACEMENT OF ANY PHOENIX FIREBIRD HD308 OR PART THEREOF
BE LIABLE UNDER ANY LEGAL THEORY FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES
INCLUDING WITHOUT LIMITATION WATER DAMAGE (THE END-USER SHOULD TAKE PRECAUTIONS
AGAINST SAME), LOST PROFITS, DELAY, OR LOSS OF USE OR DAMAGE TO ANY REAL OR PERSONAL
PROPERTY.
Some states do not allow limitations on how long an implied warranty lasts, and some do not allow the
exclusion or limitation of incidental or consequential damages, so one or both of these limitation may
not apply to you.
Legal Rights: This warranty gives you specific legal rights, and you may also have other rights which
vary from state to state.