Startup
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RT-SVX34F-EN
than the modulating can provide, the second bank is fired
at full fire and the modulating bank again adjusts to the
heating load present.
Check both ignition systems (if applicable) when going
through the test procedures.
Once the ignition system and ignitors have been checked,
open the main power disconnect switch to reset the RTRM.
Turn the main gas supply to the unit “On” and check the
gas pressure at the unit's gas train. Refer to
“Installation
Piping,” p. 36
for the proper gas supply pressure and
Figure 33, p. 37
for the location of the gas pressure taps.
Close the main power disconnect switch and start the first
stage heating Test again. Wait approximately 60 seconds
for the heater to switch to low fire and check the manifold
gas pressure. The manifold pressure for a two stage
burner must be set at negative 0.2" w.c., +/- 0.05" w.c. The
manifold pressure on a modulating burner should be set
at a positive 0.5" w.c., +/-0.05” w.c. For modulating
burners, expect to see the manifold pressure reading
fluctuate while the burner is operating, but it should never
read negative.
Jump the test terminals momentarily to initiate second
stage heat operation. The combustion blower motor
should go to high speed. The second stage of heat in units
with modulating gas will initiate the second heater bank to
fire and both banks will operate at high fire. The manifold
pressures of the two heater banks in a high heat
modulating unit will be different. The pressure setting of
the two stage burner will be a negative 0.2" w.c., while the
modulating burner will be a positive 0.05" w.c.
Note:
When firing a modulating unit for the first time, a
“humming”, or resonance sound may be heard.
This is an operational sound made by the burner
screen as it burns in. This sound is not a concern
unless it persists longer than the first few times the
unit is fired.
Electric Heat Units
Start the service test and check the amperage draw for
each heating stage. Refer to the heater electrical data in
Table 8, p. 26
(60 Hz) and
Table 11, p. 27
(50 Hz) for the full
load amps of a specific heater size.
Once the operation of the heaters have been checked,
open the main power disconnect switch or the unit
mounted disconnect switch to shut the unit “Off” and to
reset the RTRM.
This concludes the setup and testing for the major
components and controls within the unit. Follow the Test
guide in
Table 31, p. 56
-
Table 36, p. 58
to verify that the
optional VFD, economizer actuator, and minimum
ventilation controls are functioning.
Final Unit Checkout
After completing all of the checkout and startup
procedures outlined in the previous sections (i.e.,
operating the unit in each of its modes through all
available stages of cooling and heating), perform these
final checks before leaving the unit:
•
Verify that the RTRM is in the normal operation mode.
The LED located on the UCP module is “on” and
glowing continuously.
For Constant Volume Units
•
Verify that the “Mode” selection switch and the “Zone
Temperature” setpoints are set and/or programmed at
the sensor modules.
For Variable Air Volume Units
The RTAM has input setpoint potentiometers inside the
control panel that are set at the factory which will allow the
unit to operate and maintain system control. For specific
job specifications;
•
Verify that the control input potentiometers are set
according to the job specifications, i.e.;
–
Outside air reset temperature - _______ Setpoint
–
Reset amount °F. - _______ Setpoint
–
Static pressure - _______ Setpoint
–
Static pressure deadband - ________ Setpoint
–
Discharge air temperature - _______Setpoint
–
Morning warm up temperature - _______
Setpoint
–
Exhaust Fan - _______ Setpoint
•
Inspect the unit for misplaced tools, hardware and
debris.
•
Verify that all unit exterior panels—including the
control panel doors—are secured in place.
WARNING
Hazardous Gases and Flammable Vapors!
Exposure to hazardous gases from fuel substances have
been shown to cause cancer, birth defects or other
reproductive harm. Improper installation, adjustment,
alteration, service or use of this product could cause
flammable mixtures and result in a fire. To avoid
hazardous gases and flammable vapors follow proper
installation and set up of this product and all warnings
as provided in this manual. Failure to follow all
instructions could result in death or serious injury.
WARNING
Hot Surfaces!
Surface temperatures may exceed 300°F (150°C) on flue
and heat exchanger components. Contact of bare skin
on hot surfaces could result in minor to severe burns.
