17
Sizing Between Single or Second Stage Regulator and Appliance*
Maximum Propane Capacities Listed are Based on 1/2" W.C. pressure drop at 11" W.C. setting.
Capacities in 1,000 BTU/hour.
Pipe or
Nominal Pipe Size
Tubing
Tubing Size, O.D. Type L
Schedule 40
Length,
3/8"
1/2"
5/8"
3/4"
7/8"
1-1/8"
1/2"
3/4"
1"
1-1/4" 1-1/2"
Feet
10
39
92
199
329
501
935
275
567
1,071 2,205 3,307
20
26
62
131
216
346
630
189
393
732
1,496 2,299
30
21
50
107
181
277
500
152
315
590
1,212 1,858
40
19
41
90
145
233
427
129
267
504
1,039 1,559
50
18
37
79
131
198
376
114
237
448
913
1,417
60
16
35
72
121
187
340
103
217
409
834
1,275
80
13
29
62
104
155
289
89
185
346
724
1,066
100
11
26
55
90
138
255
78
162
307
630
976
125
10
24
48
81
122
224
69
146
275
567
866
150
9
21
43
72
109
202
63
132
252
511
787
200
8
19
39
66
100
187
54
112
209
439
665
250
8
17
36
60
93
172
48
100
185
390
590
*Data in accordance with NFPA pamphlet NO. 54
VIl. Electrical Wiring
WARNING
To prevent death or personal injury due to
electric shock, disconnect electrical power
before changing any electrical wiring.
CAUTION
When servicing controls, label all wires
before disconnecting. Wiring errors can
cause improper and dangerous operation.
After servicing is completed, always verify
proper operation.
The unit wiring harness is an integral part of the furnace.
Field alteration to comply with electrical codes should not
be required.
Power supply to the furnace must be NEC Class 1, and
must comply with all applicable codes. The furnace must be
electrically grounded in accordance with the local codes or,
in their absence, with the latest edition of the National
Electrical Code, ANSI NFPA No. 70 and/or the CSA C22. 1
Electrical Code. A fused disconnect must be provided and
sized in accordance with the unit maximum overcurrent
protection. This furnace has both “W1” and “W2” terminals.
The following figure shows connections for a “heat only”
two-stage system.
W2
W1
R
G
Y
W2
W1
R
C
Y
R
B
Y
R
B
G
W1
W2
Y
C
Furnace Control
Furnace Control
Remote
Condensing
Unit
Heating
Room
Thermostat
Heating/Cooling
Room
Thermostat
G
W1
W2
Figure 21
Typical Field Wiring
(24 VAC Control Circuit)
A 40 VA transformer and an integrated electronic control
are built into the furnace to allow use with most cooling
equipment.
CAUTION
To avoid the risk of electrical shock, wiring
to the unit must be properly polarized and
grounded.
To provide more reliable sensing of flame, the
ground wire
must run to the electrical panel.
Line voltage wiring
must enter into the junction box pro-
vided with the furnace.
As shipped, the junction box is attached to the left side of the
furnace (as viewed for an upflow installation). If this is
suitable for your installation, no changes are necessary.
If the line voltage wiring is to enter through the right side of
the furnace (as viewed for an upflow installation), relocate
the junction box as shown in Figure 22.
Junction
Box
Figure 22
Junction Box (Left Side)
WARNING
To prevent death or personal injury due to
electric shock, disconnect electrical power.
1. Remove both doors from the furnace.
2. Remove and save the screws holding the junction box
to the left side of the furnace.
3. Disconnect the hose from the pressure switch. Leave
the other end attached to the induced draft blower.
4. Remove five wires entering junction box from split
grommet in blower deck.
5. Swap locations of the two bushings in the junction box.
6. Rotate the junction box 180 degrees so the access
panel continues to face forward. The open snap bush-
ing should now be at the bottom.
7. Insert five wires into the split grommet on the right side
of the blower deck.
