Set Temperature Rise; Gas Rate Cu Ft/Hr - Carrier 58MVP Installation, Start-Up, And Operating Instructions Manual

EXAMPLE: I00,000 BTUH HIGH-HEAT tNPUT FURNACE
INSTALLED AT 4300 FT.
Derate Furnace Input Rate
Furnace Input Rate
X Multiplier = at Installation
at Sea Leve_
Factor Altitude
t00,000 X 0.91 = 91,000
(ANADA
At installation altitudes from 2000 to 4500 fi, this furnace
must be derated 5 percent by an authorized Gas (onversion
Station or Dealer To detem_ine correct input rate for
altitude., see example above and use 0.95 as derate multi-
plier factor.
b. Reinstall burner box cover.
NOTE: Clocking gas input rate MUST ahvays be performed with
the burner box coxer INSTALLED
c (hock that gas valve adjustn_ent caps are in place for
proper input to be clocked.
d. Obtain average heat value (at altitude) fi'om local gas
supplier.
NOTE: Be sure heating value of gas used for calculations is
correct _br your altitude. Consult local gas utility for altitude
adjustment of gas heating value.
e. Check and verif}_" orifice size in furnace. NEVER ASSUME
THE ORIFI(E SIZE. ALWAYS CHECK AND VERIFY.
£ Turn off all other gas appliances and pilots
g. Move setup switch SWI-2 to ON position. (See Fig 32)
This keeps fl/rnace locked in low-heat operation.
h. Jumper R to W/W1
i. Let fi/mace run for 3 minutes in low-heat operation.
j. Measure time (in sec) for gas meter to complete 1 revolu-
tion. Note reading.
k. Refer to Table 13 tbr cubic R of gas per hr.
1. Multiply gas rate cu ftihr by heating value (Bmicu ft).
m. Move setup switch SWI-2 to OFF position and jumper R
and WiWI and W2 them_ostat connections. (See Fig. 32.)
This keeps/:t_mace locked in high-heat operation. Repeat
items i through 1 tbr high-heat operation.
EXAMPLE: (High-heat operation at 0
2000 fl altitude)
Furnace input from rating plate is 100,000 Bmh
Btu heating input Bmicu fl X cu ftihr
Heating value of gas 975 Bmicu ft
Time for 1 revolution of 2-cu fl dial 70 sec
Gas rate 103 cu ftihr ([?om Table 13)
Btu heating input 103 X 975 100,425 Bmh In tl-ds
example, the orifice size and manifold pressure adjustment
is within _+2 percent of the furnace input rate
NOTE: Measured gas inputs (high heat and tow heat) must be
within _+2 percent of d_mt stated on furnace rating plate when
installed at sea level or derated per that stated above when installed
at higher altitudes
n. Remove jumper across R, WiWl, and W2 thermostat
connections to terminate call for heat
49
Table 13--Gas Rate Cu Ft/Hr
SECONDS SIZE OF TEST DIAL SECONDS SIZE OF TEST DIAL
FOR 1 1 2 5 FOR 1 1 2 5
REVOLUTION cu fl cu R cu fl REVOLUTION cu fl cuff cu
10 380 720 1800 50 72 144 350
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
18 225 450 1125 58 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 82 58 116 290
22 164 327 818 84 56 112 281
23 157 313 783 88 54 109 273
24 150 300 750 68 53 106 265
25 144 288 720 70 51 103 257
28 138 277 692 72 50 100 250
27 133 267 667 74 48 97 243
28 129 257 643 78 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 88 42 84 209
34 106 212 529 88 41 82 205
35 103 206 514 90 40 80 200
38 100 200 500 92 39 78 196
37 97 195 486 94 38 76 192
38 95 189 474 98 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 84 161
47 76 153 383
116 31 62 155
48 75 150 375
120 30 60 150
49 73 147 367
SET TEMPERATL RE RISE
UNIT DAMAGE HAZARD
Failure to %llow this caution may result in overheating the
heat exchangers or condensing flue gases in heat exchanger
areas not designed for condensate
Temperature rise must be within limits specified on unit
rating plate. Operation is within a few degrees of mi@oint of
rise range when setup switch SWI-4 is OFF
Furnace must operate within ranges of temperature rise specified
on the furnace rating plate. Determine air temperature rise as
follows:
1 Place them_ometers in return and supply ducts as near furnace
as possible. Be sure them_ometers do not see heat exchanger
so that radiant heat does not af_)ct readings This practice is
particularly important with straight-run ducts.
2 When tlaern_ometer readings stabilize, subtract return-air tem-
perature from supply-air temperature to determine air tem-
perature rise.
NOTE: Temperature rise can be detem_ined fbr low-heat opera-
tion by placing setup switch SWl-2 on furnace control in ON
position For high-heat operation, place setup switch SW1-2 in
OFF position and jm_aper R-W2 on fm'nace control DO NOT
forget to return setup switch to OFF position and remove R-W2
jumper upon completion of testing. (See Fig. 32 for switch and
terminal location.)