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PY5G--B: Installation Instructions
NOMINAL
INTERNAL
IRON PIPE
DIAMETER
SIZE (IN.)
(IN.)
1/2
.622
3/4
.824
1
1.049
1-1/4
1.380
1400
1-1/2
1.610
2100
*. Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5-IN. W.C. (based on a 0.60 specific gravity gas). Refer to
Gas Code NFPA 54/ANSI Z223.1.
†. This length includes an ordinary number of fittings.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death
and/or property damage.
-
Connect gas pipe to unit using a backup wrench to avoid
damaging gas controls.
-
Never purge a gas line into a combustion chamber. Never test
for gas leaks with an open flame. Use a commercially available
soap solution made specifically for the detection of leaks to
check all connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
-
Use proper length of pipe to avoid stress on gas control
manifold.
-
If a flexible connector is required or allowed by authority
having jurisdiction, black iron pipe shall be installed at furnace
gas valve and extend a minimum of 2 in. (51 mm) outside
furnace casing.
-
If codes allow a flexible connector, always use a new connector.
Do not use a connector which has previously serviced another
gas appliance.
8. Check for gas leaks at the field-installed and factory-installed gas
lines after all piping connections have been completed. Use a
commercially available soap solution (or method specified by local
codes and/or regulations).
Step 9 – Install Duct Connections
The unit has duct flanges on the supply- and return-air openings on the
side and bottom of the unit. For downshot applications, the ductwork
connects to the roof curb (See
Fig. 3
locations).
Configuring Units for Downflow (Vertical)
Discharge
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing or servicing system, always turn off main power to
system and install lockout tag. There may be more than one disconnect
switch.
1. Open all electrical disconnects before starting any service work.
2. Remove horizontal (metal) duct covers to access vertical
(downflow) discharge duct knockouts in unit basepan. (See
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 2 – Gas Flow Capacity
10
20
30
40
(3)
(6)
(9)
(12)
175
120
97
82
360
250
200
170
680
465
375
320
950
770
600
1460
1180
990
and
Fig. 4
for connection sizes and
*
LENGTH OF PIPE FT (m)
50
60
70
80
(15)
(18)
(21)
(24)
73
66
61
57
151
138
125
118
285
260
240
220
580
530
490
460
900
810
750
690
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Collect ALL screws that were removed. Do not leave screws on rooftop
as permanent damage to the roof may occur.
3. For single-phase models only, on the discharge side only, remove
the insulation covering the downshot (plastic) knockout. Insulation
is held in place with aluminum tape. Please note that large chassis
units have 2 pieces of insulation, and only the piece over the
downshot knockout needs to be removed. Discard insulation.
4. To remove the downshot (plastic) knockouts for both supply and
returns, break front and right side connecting tabs with a
screwdriver and hammer. Push cover down to break rear and left
side tabs. These plastic knockouts are held in place with tabs
similar to an electrical knockout. Discard plastic knockout covers.
5. Set unit on roof curb.
6. Verify that the downshot ducts are aligned with the downshot
knockout areas.
7. Re-install horizontal (metal) covers as needed to seal unit. Ensure
openings are air and watertight.
NOTE: The design and installation of the duct system must be in
accordance with the standards of the NFPA for installation of
nonresidence-type air conditioning and ventilating systems, NFPA 90A
or residence-type, NFPA 90B; and/or local codes and ordinances.
Horizontal Duct Covers
Fig.
9.)
12
†
90
100
125
150
(27)
(30)
(38)
(46)
53
50
44
40
110
103
93
84
205
195
175
160
430
400
360
325
650
620
550
500
Table 2
and National Fuel
CAUTION
!
175
200
(53)
(61)
—
—
77
72
145
135
300
280
460
430
A09510
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