McQuay Skyline IM 777-1, Installation And Maintenance Manual

McQuay IM 777-1

5

Installation Guidelines

Access Doors and Panels

For routine maintenance, access normally is obtained through 
access doors or by removing side panels. Removing all flat 
head fasteners along the sides of a panel allow it to be 
removed.

Fan and filter sections are always provided with a service door 
on one side of the unit. If requested on order, doors can be 
provided on both sides of the unit. Optional service doors are 
available for most section types and are provided based on 
customer request.

Note –

Opening fan section doors requires using a 1/2" socket 
wrench, which satisfies ANSI standards and other codes 
that require the “use of tools” to access compartments 
containing moving parts or electrical wiring. See 
Figure 10.

1

Remove padlock if one is present.

2

Insert 1/2" socket into cup and rotate 1/4 turn clockwise as 
shown in Figure 10. If the cup and handle are on the left 
side of the door, rotate 1/4 turn counterclockwise. 

3

Rotate the door handle 1/4 turn clockwise and then 1/4 turn 
counterclockwise to release any internal pressure or 
vacuum and open the door. If the cup and handle are on the 
left side of the door, rotate the door handle 1/4 turn 
counterclockwise and then 1/4 turn clockwise. 

4

To prevent air leakage, tighten the door panels by adjusting 
the jam nuts.

Figure 10: Opening fan section door

Injected-Foam Insulated Panels 

Skyline air handlers now are furnished with double-wall, 
injected-foam insulated panels. Foam panels are stronger, 
more rigid, and lighter than panels with fiberglass insulation. 
The insulation R-value is improved to 13. However, foam 
insulation can burn when exposed to flame or other ignition 
sources and release toxic fumes. Take care in cutting and 
sealing all field-cut openings in these panels.

Panel cutting procedure

1

Determine the number and location of holes required for 
electrical conduit, piping, and control wiring as follows:

•

Check that adequate space is available inside the unit for 

conduit or pipe routing.

•

Do not locate holes in a panel that provides access to key 

maintenance components such as filters and fan 
assemblies.

•

Do not locate where the conduit or piping blocks airflow 

or obstructs hinged access doors.

2

Once a proper location is determined, drill a small pilot 
hole completely through the panel. Then use a sharp hole 
saw or a saber saw and cut from each side of the panel.

CAUTION

SHARP EDGES AND COIL SURFACES

are a potential injury hazard. Avoid contact with them.

ATTENTION

Les bords tranchants et les surfaces des bobines sont un 

risque de blessure. Ne les touchez pas.

CAUTION

 DO NOT attempt to rotate the cup.

Damage to the unit will occur.

ATTENTION

NE PAS tenter de faire tourner la cuvette (cup).

Ceci va dendomagger l’unité.

OPEN

View from inside door

Jam 
Nuts

Do Not Rotate Cup