Step 3 1 Turn off the electrical supply to the unit by
switching the RTU main disconnect to off. Then,
ensure personal safety by installing a lockout tag on
the disconnect.
C07331
Fig. 16 - RTU Main Disconnect - Electrical Supply
Step 4 1 Remove the gas component access panel.
For location of the gas component access panel, see
Fig. 6 or Fig. 7 (depending on the size of the unit).
C08487
Fig. 17 - Gas Component Access Panel Removal
Step 5 1 Move the RTU gas valve on/off switch to
the OFF position and wait 5 minutes.
Single-Stage
RTU gas valve
_. On/Off
_--Switch
Two-Stage 300k BTU/Hr
RTU gas valve Two-Stage
RTU gas valve
On/Off Ht • I-I[ _=_--J"l
_r--Switch
II II
C08469
Fig. 18 - Single- and Two-Stage Gas Valves
Step 6 1 Replace the gas component access panel.
C08490
Fig. 19 - Replacing the Gas Component Access Panel
Step 7 1 If the unit is being shut down because of a
malfunction, contact your dealer as soon as possible.
DO NOT proceed to step 8.
Step 8 1 If the unit is being shut down because the
heating season has ended, remove the disconnect
lockout tag and restore electrical power to the unit by
switching the RTU main disconnect to ON and then set
thermostat/unit controller to the COOL position to
ensure operation of the cooling system during the
cooling season.
MAIN _.__[["-]
C07336
Fig. 20 - RTU Main Disconnect - Electrical Supply
ROUTINE MAINTENANCE & CARE
FOR THE EQUIPMENT OWNER
While some maintenance can be performed by laymen,
most should be performed by skilled, experienced
personnel. Follow the recommended service maintenance
schedule, and modify it as necessary for your
application/environment. For instance, dusty areas may
require more frequent filter changes.
After performing any maintenance or service on the unit,
be sure all panels are securely fastened in place to prevent
rain from entering unit cabinet and to prevent disruption
of the correct unit airflow pattern.
FIRE AND EQUIPMENT DAMAGE HAZARD
Failure to follow this warning could result in personal
injury and damage to equipment.
Do not use this unit if any part has been under water.
Immediately call a qualified service technician to
inspect the unit and to replace any part of the control
system and gas control that has been under water.
To ensure proper functioning of the unit, flow of
combustion and ventilating air must not be obstructed
from reaching the unit. Follow service and performance
clearances as listed in the product data.
Consider the following information before maintaining or
servicing equipment:
Compressor
All compressors are factory supplied with a normal charge
of the correct type refrigeration-grade oil in them and
should not require additional oil.
Indoor Air Filter(s)
FIRE AND EQUIPMENT DAMAGE HAZARD
Failure to follow this warning could result in personal
injury and damage to equipment.
Never operate unit without filters in place. The
accumulation of dirt, dust or lint on the internal parts
of your unit can cause fire or a loss of efficiency.
Damage to the blower motor and/or compressors
could also result.
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