Carrier 58PAV - Manual (Page 15)

Table 16—Gas Rate Cu Ft/Hr
Seconds SIZE OF TEST DIAL Seconds SIZE OF TEST DIAL
for one 1 2 5 for one 1 2 5
Revolution cu ft CU ft CU ft Revolution cu ft cu ft cu ft
10 360 720 1800 50 72 144 360
11 327 655 1636 51 71 141 355
12 300 600 1500 52 69 138 346
13 277 555 1385 53 68 136 340
14 257 514 1286 54 67 133 333
15 240 480 1200 55 65 131 327
16 225 450 1125 56 64 129 321
17 212 424 1059 57 63 126 316
18 200 400 1000 58 62 124 310
19 189 379 947 59 61 122 305
20 180 360 900 60 60 120 300
21 171 343 857 62 58 116 290
22 164 327 818 64 56 112 281
23 157 313 783 66 54 109 273
24 150 300 750 68 53 106 265
25 144 288 720 70 51 103 257
26 138 277 692 72 50 100 250
27 133 267 667 74 48 97 243
28 129 257 643 76 47 95 237
29 124 248 621 78 46 92 231
30 120 240 600 80 45 90 225
31 116 232 581 82 44 88 220
32 113 225 563 84 43 86 214
33 109 218 545 86 42 84 209
34 106 212 529 88 41 82 205
35 103 206 514 90 40 80 200
36 100 200 500 92 39 78 196
37 97 195 486 94 38 76 192
38 95 189 474 96 38 75 188
39 92 185 462 98 37 74 184
40 90 180 450 100 36 72 180
41 88 176 439 102 35 71 178
42 86 172 429 104 35 69 173
43 84 167 419 106 34 68 170
44 82 164 409 108 33 67 167
45 80 160 400 110 33 65 164
46 78 157 391 112 32 64 161
47 76 153 383 116 31 62 155
48 75 150 375 120 30 60 150
49 73 147 367
d. Approved input ratings.
The U.S.A. ratings are approved for altitudes up to
2000 ft for natural and propane gases. Refer to
National Fuel Gas Code Appendix F, Table F-4 for
proper orifice sizing at high altitudes,
e. Canadian installations only.
The Canadian ratings are approved for altitudes up
to 2000 ft for natural and propane gases. High alti­
tude ratings are from 2000 ft to 4500 ft above sea
level. See Table 17 for nominal burner orifice size.
High altitude rating includes a 10% derate as
required by Canadian standards.
Table 17—Canadian Orifice Size
Sea Level High Altitude
Gas 0—2000 ft 20Ô0—4500 ft
Natural 43 44
Propane 54 55
2. Set temperature rise.
Do not exceed the temperature rise range specified on
the unit rating plate. Determine the air temperature
rise as follows:
a. Place duct thermometers in return and supply ducts
as near furnace as possible. Be sure thermometers
do not “see” heat exchangers so that radiant heat
will not affect thermometer readings. This is partic­
ularly important with straight-run ducts.
b. When thermometer readings stabilize, subtract
return-air temperature from supply-air temperature
to determine temperature rise.
c. Adjust air temperature rise by adjusting blower
speed. Increase blower speed to reduce temperature
rise. Decrease blower speed to increase temperature
rise.
A WARNING
Disconnect the electrical power before changing the
speed tap. A failure to follow this warning can cause
personal injury.
d. To change motor speed taps, remove the motor tap
lead (see Table 18) and relocate it on the desired ter­
minal on the plug-in terminal block/speed selector
located on the blower housing.
A CAUTION
Recheck the temperature rise. It must be within the
Hmits specified on the unit rating plate. Recommended
operation at mid-point of rise or above.
Table 18—Speed Selector
Speed Tap No.*
Common C
Hi 1
Med-Hi 2
Med-Low 3
Low 4
*White wire from control box to common; black wire from control box to
cooling speed selection; red wire from control box to heating and con­
stant fan speed selection.
3. Set thermostat heat anticipator.
The thermostat heat anticipation must be set to match
the amp draw of the electrical components in the R-W
circuit. Accurate amp draw readings can be obtained at
thermostat subbase terminals R & W. Fig. 16 illus­
trates an easy method of obtaining the actual amp
draw. The amp reading should be taken after the
blower motor has started. See the thermostat manufac­
turer’s instructions for adjusting the heat anticipator
and for varying the heating cycle length.
NOTE: When using an electronic thermostat, set the cycle
rate for three cycles per hour.
E. Check Safety Controls
The flame sensor, gas valve, and pressure switch were all
checked in the Startup Section as part of normal operation.
Fig. 16—Amp Draw Check With Ammeter
15