General Unit Requirements - Trane Axiom GWS Series Installation, Operation And Maintenance Manual

and return air openings. Be sure to use flexible duct
connections at the unit.
• For "built-up" curbs supplied by others, gaskets
must be installed around the curb perimeter flange
and the supply and return air opening flanges.

General Unit Requirements

The checklist listed below is a summary of the steps
required to successfully install a commercial unit. This
checklist is intended to acquaint the installing
personnel with what is required in the installation
process. It does not replace the detailed instructions
called out in the applicable sections of this manual.
• Check the unit for shipping damage and material
shortage; file a freight claim and notify appropriate
sales representative.
• Verify correct model, options and voltage from
nameplate.
• Verify that the installation location of the unit will
provide the required clearance for proper
operation.
• Assemble and install the roof curb (if applicable).
Refer to the latest edition of the curb installers
guide that ships with each curb kit.
• Fabricate and install ductwork; secure ductwork to
curb.
• Rig the unit.
• Set the unit onto the curb; check for levelness.
• Ensure unit-to-curb seal is tight and without buckles
or cracks.
• Install and connect a condensate drain line to the
evaporator drain connection.
N N o o t t e e : : Condensate Overflow Switch (if equipped) will
not work if unit is not level or slightly sloped
toward switch.
Factory Installed Economizer
• Ensure the standard economizer has been pulled
out into the operating position. Refer to the
economizer Installation Instructions for proper
setup.
N N o o t t e e : : Low leak economizers do not pull out. Refer
to low leak economizers installation
instructions for proper setup.
• Install all access panels.
Electric Heat Requirements
• Verify that the power supply complies with the
electric heater specifications on the unit and heater
nameplate.
• Inspect the heater junction box and control panel;
tighten any loose connections.
WSHP-SVX015C-EN
• Check electric heat circuits for continuity.
Temperature Limit Switch
Usage for Electric Heat Units
N N o o t t e e : : Applies only to 3 to 10 ton units.
Units are factory shipped in the downflow discharge
configuration but can be field converted to a horizontal
discharge configuration. Some, but not all units require
a different TCO-A limit switch, which is wire tied near
the terminal block in the heater compartment if
horizontal discharge configuration is used.
Condensate Drain Configuration
An evaporator condensate drain connection is
provided on each unit. Refer to the Unit Dimensions
section for the appropriate drain location.
A condensate trap must be installed at the unit due to
the drain connection being on the "negative pressure"
side of the fan. Install the p-trap using the guidelines in
Figure 35, p. 36.
A condensate drain line must be connected to the P-
Trap. Pitch the drain lines at least 1/2 inch for every 10
feet of horizontal run to assure proper condensate flow.
Do not allow the horizontal run to sag causing a
possible double-trap condition which could result in
condensate backup due to "air lock".
T T o o c c o o n n v v e e r r t t d d r r a a i i n n c c o o n n d d e e n n s s a a t t e e o o u u t t t t h h e e f f r r o o n n t t o o f f u u n n i i t t - - 3 3
t t o o 1 1 0 0 t t o o n n u u n n i i t t s s : :
1. Remove evaporator access panel and supply air
access panels.
2. Remove the support panel that the condensate
drain pan exits through.
3. Slide the condensate drain pan out of the unit and
rotate 180°.
4. Slide the condensate drain pan back into the unit,
align the drain with the grommeted opening in the
rear support panel and push until the coupling is
seated in the grommet.
5. Replace the front support panel by aligning the
panel with tabs in the raceway. Align the
condensate drain pan support in the grommeted
hole as the panel is put in place.
6. Replace evaporator access panel and supply air
access panels.
T T o o c c o o n n v v e e r r t t d d r r a a i i n n c c o o n n d d e e n n s s a a t t e e t t h h r r o o u u g g h h - - t t h h e e - - b b a a s s e e o o f f
u u n n i i t t - - 3 3 t t o o 1 1 0 0 t t o o n n u u n n i i t t s s : :
1. Remove evaporator access panel and supply air
access panels.
2. Remove the support panel that the condensate
drain pan exits through.
3. Slide the condensate drain pan out of the unit.
I I n n s s t t a a l l l l a a t t i i o o n n
35