4
C08487
Fig. 6 -- Gas Component Access Panel Removal
Step 5 —
Move the RTU gas valve on/off switch to the
OFF position and wait 5 minutes. See Fig. 7.
Two-Stage
RTU gas valve
300k BTU/Hr
Two-Stage
RTU gas valve
On/Off
Switch
OFF
ON
C11483
Fig. 7 -- Two--Stage RTU Gas Valves
Step 6 —
Move the RTU gas valve on/off switch to
the ON position.
Step 7 — Replace the gas component access panel.
C08490
Fig. 8 -- Replacing the Gas Component Access Panel
Step 8 —
Remove disconnect lockout tag and restore
power to the unit by switching the RTU main
disconnect to ON.
ON
MAIN
OFF
C07336
Fig. 9 -- RTU Main Disconnect -- Electrical Supply
NOTE: Normal operation will automatically begin.
Service Test mode will automatically end (exit) after a
recycle of power.
Step 9 —
Open the gas supply shut--off valve located
outside the unit.
C07337
Fig. 10 -- Gas Supply Shut Off Valve
Step 10 —
Using the Scrolling Marquee, enable the
unit to run using the following procedure:
a. Push the ESCAPE key until a blank display
screen is shown.
b. Push the DOWN arrow key until the SERVICE
TEST LED is lit.
c. Push the ENTER key. The display will show
TEST.
d. Push the ENTER key again. The NO/YES dis-
play will flash.
e. Push the UP or DOWN key to toggle the display
to NO and then push ENTER. The unit will re-
turn to normal operation and exit SERVICE
TEST mode.
Step 11 —
To test the operation of the gas section, use
the Scrolling Marquee test routine to energize the gas
outputs and to turn on the gas.
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
Alarm Status
ENTER
MODE
ESCAPE
C06320
Fig. 11 -- ComfortLink Controller
Step 12 —
For normal operation, make sure that the
set points are at the normal heat set points.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
If the main burners fail to light, or the blower fails to
come on, shut down gas heating section and call your
dealer for service.
!
WARNING
TO SHUT OFF UNIT
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
1. Turn off gas supply by closing the gas line supply
valve. Then, turn off the electrical power supply to the
unit by switching the disconnect to off. Install lockout
tag before servicing or performing maintenance.
2. Do not turn off the electrical power to unit
without first turning off the gas supply.
!
WARNING
Should overheating occur, or the gas supply fail to shut
off, shut off the gas valve in the unit (by moving on/off
switch to off) before shutting off the electrical supply.
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