Payne PG8M Installation, Start-Up And Service Instructions Manual page 29

Caution!! For the following applications, use the minimum vertical vent sections as specified below.
For all other applications, follow exclusively the National Fuel Gas Code.
FURNACE ORIENTATION VENT ORIENTATION
Vent elbow left, then up
Downflow
Horizontal Left
Horizontal Left
Horizontal Left
Vent elbow up then left
Downflow
Vent elbow up, then right
Downflow
NOTE: All vent configurations must also meet National Fuel Gas Code venting requirements NFGC.
*4 in. inside casing or vent guard
**Including 4 in. vent section(s)
Table 6–Altitude Derate Multipler for U.S.A.
ALTITUDE PERCENT
(FT) OF DERATE
0–2000
2001–3000 8–12
3001–4000 12–16
4001–5000 16–20
5001–6000 20–24
6001–7000 24–28
7001–8000 28–32
8001–9000 32–36
9001–10,000 36–40
* Derate multiplier factors are based on midpoint altitude for altitude range.
INLET
PRESSURE
TAP
Fig. 40—Redundant Automatic Gas Control Valve
a. Mechanical thermostat—Set thermostat heat anticipator to
match the amp draw of the electrical components in the
R-W circuit. Accurate amp draw readings can be obtained
at the wires normally connected to thermostat subbase
terminals, R and W. The thermostat anticipator should
NOT be in the circuit while measuring current.
FURNACE INPUT(BTU/HR)
Fig. 30
110,000(036/-12 only)
Vent elbow right,
then up
Fig. 33
Vent Elbow up
Fig. 34
Vent elbow right
Fig. 35
Fig. 28 (036/-12 only)
Fig. 31 (036/-12 only)
DERATE MULTIPLIER
FACTOR*
0 1.00
0.90
0.86
0.82
0.78
0.74
0.70
0.66
0.62
ON AND OFF
SWITCH
GAS PRESSURE
REGULATOR
ADJUSTMENT
MANIFOLD
PRESSURE TAP
MINIMUM
VENT DIAMETER (IN.)*
154,000
132,000 5
154,000
5
132,000
154,000
5
132,000
154,000 5
110,000
5
110,000
5
COLOR
White
Black
Yellow†
Blue*
Red*
* 1/5 HP motor models: BLUE to HEAT, RED to SPARE.
† Not available on 1/5 HP motors.
NOTE: Continuous blower is the HEAT speed.
(1.) Remove thermostat from subbase or from wall.
(2.) Connect an amp meter as shown in Fig. 42 across the
R and W terminals or R and W wires.
A00157
(3.) Record amp draw across terminals when furnace is in
heating and after blower starts.
(4.) Set heat anticapator on thermostat per thermostat
instructions and install on subbase or wall.
b. Electronic thermostat: Set cycle rate for 4 cycles per hr.
7. Adjust blower off delay
The blower off delay has 4 adjustable settings from 90 sec to
180 sec. The blower off delay jumpers are located on the
furnace control board. (See Fig. 23.)
28
MINIMUM VERTICAL VENT HEIGHT (FT)**
12
7
7
7
10
10
BURNER
Fig. 41—Orifice Hole
Table 7—Speed Selection
SPEED
Common
High
Med-High
Med-Low
Low
ORIFICE
A93059
AS SHIPPED
BLW
COOL
SPARE
SPARE
HEAT