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PY5G--B: Installation Instructions
Leak detection equipment shall be calibrated to R-454B. If a leak
above 20% of the LFL is found, proceed to recovery.
6. Shut off power to unit.
7. Before beginning recovery of the refrigerant:
a. Make sure that handling equipment is available, if needed, to
handle the refrigerant recovery cylinders.
b. All personal protective equipment is available, and must be used
correctly.
c. Recovery process must be performed by an EPA-certified
technician.
d. All recovery equipment and cylinders must conform to
appropriate standards and be suitable for the recovery of
FLAMMABLE REFRIGERANTS (R-454B).
8. Recovery process:
Follow recovery process outlined in the DECOMMISIONING
SECTION.
9. Should any installation/service work on the A2L refrigerant system
be needed, non-sparking tools are required. If the refrigerant system
is opened, a refrigerant detector should be used to check for leaks.
Open flames or other ignition sources should not be present, except
during brazing. Brazing should only take place on refrigerant tubes
that are open to the atmosphere or have been properly evacuated.
10. Repair leak following accepted practices.
11. If compressor or compressor oil is to be removed, ensure that they
have been evacuated to 200 microns or less to make certain that
R-454B does not remain within the lubricant. The evacuation
process shall be carried out prior to returning the compressor to the
supplier. The crankcase electric heat may be used to accelerate the
compressor evacuation process. A torch must not be used. When oil
is drained from a system, it shall be carried out safely.
NOTE: Install a new filter drier whenever the system has been opened
for repair.
NOTE: Refrigerant cylinders used for charging must be kept in
appropriate position and grounded to earth before charging. Hose length
should be kept to a minimum. Care should be taken not to overcharge the
system.
12. Add a small charge of R-454B refrigerant vapor to system and
leak-test.
13. If no additional leaks are found, recover refrigerant from refrigerant
system (Using Recovery steps outlined in the Decommissioning
section) and evacuate to 500 microns.
14. Charge unit with R-454B refrigerant, using an accurate scale. Refer
to unit rating plate for required charge. Do not overfill the system.
15. Label the system with the refrigerant charge amount.
16. Conduct follow-up leak test prior to leaving the job site.
Step 2 – Start-up Heating and Make Adjustments
Complete the required procedures given in the Pre-Start-Up section
before starting the unit. Do not jumper any safety devices when
operating the unit. Make sure that burner orifices are properly aligned.
Unstable operation my occur when the burner orifices in the manifold
are misaligned.
Follow the lighting instructions on the heating section operation label
(located on the inside of the control access panel) to start the heating
section.
NOTE: Make sure that gas supply has been purged, and that all gas
piping has been checked for leaks.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Pipe Plug
Fig. 14 – Burner Assembly
Fig. 15 – Monoport Burner
Check Heating Control
Start and check the unit for proper heating control operation as follows
(see furnace lighting instructions located on the inside of the control
access panel):
1. Place room thermostat SYSTEM switch in the HEAT position and
the fan switch is placed in AUTO position.
2. Set the heating temperature control of the thermostat above room
temperature.
3. The induced-draft motor will start.
4. On a call for heating, the main burner should light within 5 sec. of
the spark being energized. If the burners do not light, there is a
22-sec. delay before another 5-sec. try. If the burners still do not
light, this sequence is repeated. For 3-phase models if the burners
do not light within 15 minutes from the initial call for heat, there is
a lockout. For single phase models, if the burners do not light on the
4th ignition attempt, there is a lockout. To reset the control, break
the 24-v power to W.
5. For 3-phase models the evaporator fan will turn on 45 sec. after the
flame has been established. The evaporator fan will turn off 45 sec.
after the thermostat has been satisfied. For single phase models the
evaporator fan will turn on 30 sec. after the flame has been
established. The evaporator fan will turn off 90 sec. After the
thermostat has been satisfied. Please note that the integrated gas
unit controller (IGC) has the capability to automatically reduce the
evaporator "ON" delay and increase the evaporator "OFF" delay in
the event of high duct static and/or partially-clogged filter.
17
Manifold
A07679
BURNER FLAME
BURNER
MANIFOLD
C99021
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