10
Fig. 9 — 48/50LC Size 14-26 Units – Panel and Filter Locations (48LC*14 Unit Shown)
Gas Heat (48LC units only)
Inspect the gas heat section of the unit. Verify the number of
burners match the number of heat exchanger openings and the
burner assembly is properly aligned. If the orifices were changed
out for elevation or liquid propane purposes, verify proper instal-
lation. Visually inspect other components in heat section.
Verify gas pressures before turning on heat as follows:
1. Close the field-supplied manual gas shut off valve, located
external to the unit.
2. Connect a pressure gage to the supply gas pressure tap,
located on the field-supplied manual gas shut off valve
(see Fig. 10).
3. Connect a pressure gage to the manifold pressure tap on
the burner assembly located inside the unit.
4. Open the field-supplied manual gas shut off valve. Enter
Service Test mode by setting TEST MODE to “ON” using
the SystemVu™ controller interface. Use the Service Test
feature to set HEAT 1 TEST to ON (first stage of heat)
using the SystemVu controller interface.
5. After the unit has run for several minutes, verify the sup-
ply gas pressure is adequate per the base unit installation
instructions. If not, adjust accordingly.
NOTE: Supply gas pressure must not exceed 13.0 in. wg.
6. Set HEAT 1 TEST to OFF using the SystemVu controller
interface.
7. Exit Service Test mode by setting TEST MODE to “OFF”
using the SystemVu controller interface.
Fig. 10 — Field Gas Piping
CONTROLS QUICK SET-UP
The following information will provide a quick guide to setting
up and configuring the 48/50LC series units with SystemVu
controls. Unit controls are pre-configured at the factory for fac-
tory-installed options. Field-installed accessories will require
configuration at start-up. Initial System Startup is recommend-
ed for initial start-up. Additionally, specific job requirements
may require changes to default configuration values. See Ap-
pendix A and other sections of these instructions for more de-
tails. Refer to the Major System Components or accessory in-
stallation instructions for specific wiring detail.
Control Set Point and Configuration Log
During start up, accessory installation, and equipment service set
points and/or configuration changes might have to be made.
When setting set points or configuration settings, documentation
is recommend. The Control Set Point and Configuration Log
starting on page 174 should be filled out and left with the unit at
all times, and a copy should also be provided to the equipment
OUTDOOR AIR
SCREEN
(HIDDEN)
CONTROL BOX
ACCESS PANEL
FILTER AND
INDOOR COIL
ACCESS PANEL
INDOOR BLOWER
ACCESS PANEL
GAS SECTION
ACCESS PANEL
MANUAL GAS SHUT OFF VALVE
(FIELD SUPPLIED)
SUPPLY GAS
PRESSURE TAP
(1/8˝ NPT PLUG)
GAS
SUPPL
SEDIMENT TRAP
UNION
TO
UNIT
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