Under Roof Mounting - Cambridge Engineering S Series Technical Manual

INSTALLATION INSTRUCTIONS

UNDER ROOF MOUNTING

mWARNING:
Due to the size and weight of this equipment, it
is recommended the heater mounting structure be
reviewed and approved by a qualified structural
engineer and the roof manufacturer before install-
ing this equipment.
IMPORTANT
Before proceeding with the installation, verify the
feasibility of the location selected with respect to
accessibility to the equipment for service and main-
tenance functions.
m
To prevent contaminated air from being drawn
into the heater, install the heater's inlet at least 10
feet from any building exhaust, process exhaust,
sewer stacks, or other sources that would allow
contaminants to be drawn into the heater. Consult
local codes for additional references.
1. Prepare roof penetration to the dimensions below.
See page 7 for Under Roof Mounting - Curb
drawing
IMPORTANT
Accurate measurements are critical and will affect
the installation process. Verify that the roof opening
aligns with the curb opening.
2. Install the mounting curb and the mounting struc-
ture per the structural engineer and roof manufac-
turer's recommendations.
Model
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
*For optional filter section
** Dimensions allow for ¾" clearance on each side
Cambridge Engineering, Inc.
CAUTION
Weight Qty.
550 lbs. 4 (6*)
800 lbs. 4 (6*)
1500 lbs. 4 (6*)
The mounting curb or mounting structure should
be installed such that the heater's inlet plenum will
mount level.
3. Seal all roof penetrations to prevent roof leaks.
4. Lower the inlet duct through the mounting curb
and the roof opening.
5. Secure the inlet plenum to the curb.
6. Connect inlet accessories to the heater including
filter section (optional) and inlet elbow prior to
lifting the heater in place.
7. Install hanging rods to adequate ceiling supports
and align with the hanging brackets on the heater.
Refer to hanging rod size shown on table below.
8. Remove the lag bolts used to fasten the unit to the
skid. Do not remove the hanging brackets from the
side of the heater. On S400/S800 model heaters,
rotate the hanging brackets 180˚, and retighten the
securing hardware.
9. Use a forklift or comparable lifting device to raise
and position the heater. Take precautions to pre-
vent equipment damage (dents and/or scratches)
when the heater is being lifted into position.
10. Use washers and double lock nuts to secure equip-
ment on the hanging rods.
11. Install the directional elbows. Consult the job lay-
out for the orientation of the elbows.
Hanging Rods
Size A
3/8" dia. 57 7/8"
3/8" dia. 69 7/8"
1/2" dia. 75¾"
14
IMPORTANT
Roof Opening**
B* C
33¼" 27 7/8"
33¼" 43 7/8"
36¾" 48 7/8" 37¼"
S-Series Technical Manual
L W
25" 25"
30" 41¼"
46¾"