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Location and Recommendations
Unit Support
If unit is to be roof mounted check building codes for weight
distribution requirements. Refer to accessory roof curb mount-
ing instructions. Check unit nameplate for supply voltage re-
quired. Determine if adequate electrical power is available.
Refer to specification sheet. Furnace may be installed on
Class A, B or C roofing material.
Location and Clearances
Installation of unit should conform to national and local build-
ing codes.
Model YK heating/cooling units are designed for outdoor
mounting with a vertical condenser discharge. They can be lo-
cated either at ground level or on a roof, in accordance with
national and local codes. Since these units are designed ex-
clusively for outdoor operation, additional flue venting systems
are not required. Each unit contains an operating charge of re-
frigerant as shipped.
Select a location that will permit unobstructed airflow into the
condenser coil and away from the fan discharge and permit
unobstructed combustion airflow into the burner compartment.
Suggested airflow clearances and service clearances are
given in Figure 1A and 1B .
Placing and Rigging
NOTE : Before attempting to rig the unit, remove the
fork lift pockets located on the condenser end of the
unit.
Figure 2
Rig the unit using either belt or cable slings. The sling eyelet
must be placed through the lifting holes in the base rail of the
unit. The point where the slings meet the lifting eyelet should
be at least 1.8m above the unit. Use spreader bars to prevent
excessive pressure on the top of the unit during lifting. Figure
2 shows the unit center of gravity.
INSTALLATION
7
IMPORTANT: The use of "spreader bars" is required
when hoisting the unit (prevents damage to sides and
top). Top crating can be used as spreader bars.
Mounting Unit on Roof
Downflow units should be mounted on a roof curb when pos-
sible. When installing the unit on the roof curb, follow the in-
stallation instructions accompanying the roof curb kit. On new
roofs, the curb should be welded directly to the roof deck. For
existing construction, nailers must be installed under the curb
if welding is not possible. Be sure to attach the downflow
ductwork to the curb before setting unit in place. See Figure
3A or 3B. Refer to the curb installation instructions to insure
the unit will be level.
When installing the unit, it must be level to insure proper con-
densate flow from the unit drain pan. The maximum pitch of
the unit down from the condensate drain of the unit is 6mm
per meter.
Slab Mount
For ground level installation, the unit base should be ad-
equately supported and hold the unit near level. The installa-
tion must meet the guidelines set forth in local codes.
Table 1
Corner weights & Center of Gravity
Net
Unit
Weight
Description
(kg)
A
YK*085C
437
149
YK*100B
566
193
YK*100C
447
152
YK*125C
590
195
YK*155B
698
243
YK*175C
735
251
YK*200B
920
324
YK*250B
946
327
*Downflow or Horizontal
Note: Corner weights are given for information only.
Unit is to be supported continuously by curb or
equivalent frame support.
Corner Weights
Center of
(kg)
Gravity (mm)
B
C
D
Length Width
111
75
101
965
150
98
125
965
114
78
103
965
155
106
134
1041
176
118
162
1143
188
127
169
1168
242
151
203
1321
251
159
208
1346
508
635
508
660
737
737
838
838
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