106
RT-SVX34R-EN
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.
WWAARRNNIINNGG
HHaazzaarrddoouuss GGaasseess aanndd FFllaammmmaabbllee
VVaappoorrss!!
FFaaiilluurree ttoo oobbsseerrvvee tthhee ffoolllloowwiinngg iinnssttrruuccttiioonnss ccoouulldd
rreessuulltt iinn eexxppoossuurree ttoo hhaazzaarrddoouuss ggaasseess,, ffuueell
ssuubbssttaanncceess,, oorr ssuubbssttaanncceess ffrroomm iinnccoommpplleettee
ccoommbbuussttiioonn,, wwhhiicchh ccoouulldd rreessuulltt iinn ddeeaatthh oorr sseerriioouuss
iinnjjuurryy.. TThhee ssttaattee ooff CCaalliiffoorrnniiaa hhaass ddeetteerrmmiinneedd tthhaatt
tthheessee ssuubbssttaanncceess mmaayy ccaauussee ccaanncceerr,, bbiirrtthh ddeeffeeccttss,,
oorr ootthheerr rreepprroodduuccttiivvee hhaarrmm..
IImmpprrooppeerr iinnssttaallllaattiioonn,, aaddjjuussttmmeenntt,, aalltteerraattiioonn,,
sseerrvviiccee oorr uussee ooff tthhiiss pprroodduucctt ccoouulldd ccaauussee
ffllaammmmaabbllee mmiixxttuurreess oorr lleeaadd ttoo eexxcceessssiivvee ccaarrbboonn
mmoonnooxxiiddee.. TToo aavvooiidd hhaazzaarrddoouuss ggaasseess aanndd
ffllaammmmaabbllee vvaappoorrss ffoollllooww pprrooppeerr iinnssttaallllaattiioonn aanndd
sseettuupp ooff tthhiiss pprroodduucctt aanndd aallll wwaarrnniinnggss aass pprroovviiddeedd
iinn tthhiiss mmaannuuaall..
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. 40 for the proper gas supply
pressure and Figure 35, p. 41 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.
WWAARRNNIINNGG
HHoott SSuurrffaaccee!!
FFaaiilluurree ttoo ffoollllooww iinnssttrruuccttiioonnss bbeellooww ccoouulldd rreessuulltt iinn
sseevveerree bbuurrnnss..
SSuurrffaaccee tteemmppeerraattuurreess mmaayy eexxcceeeedd 330000°°FF ((115500°°CC))..
TToo aavvooiidd ppoossssiibbllee sskkiinn bbuurrnnss,, ssttaayy cclleeaarr ooff tthheessee
ssuurrffaacceess.. IIff ppoossssiibbllee,, aallllooww ssuurrffaacceess ttoo ccooooll bbeeffoorree
sseerrvviicciinngg.. IIff sseerrvviicciinngg iiss nneecceessssaarryy wwhhiillee ssuurrffaaccee
tteemmppeerraattuurreess aarree ssttiillll eelleevvaatteedd,, yyoouu MMUUSSTT ppuutt oonn
aallll PPeerrssoonnaall PPrrootteeccttiivvee EEqquuiippmmeenntt ((PPPPEE))..
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.
NNoottee:: 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 9, p. 29 (60 Hz) and Table 13, p. 31 (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 , p. 68 - Table 46, p. 74 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 Variable Air Volume Units
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
SSttaarrttuupp
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