Carrier 100 Series - General; Sequence of Operation

Table 8—Horizontal Vent Termination Clearances
LOCATION
CLEARANCE (FT)
U.S.A.
Canada
Above anticipated snow depth
1
14
From mechanical fresh air intake
1
6
For furnaces with an input capacity less than 100,000 Btuh
from any nonmechanical air supply (such as a door or win¬
dow) or combustion-air opening
4 below
4 horizontally
1 above
1
For furnaces with an input capacity greater than 100,000 Btuh
from any nonmechanical air supply (such as a door or win¬
dow) or combustion-air opening
3
From service regulator vent, electric and gas meters and re¬
lief equipment
4*
6t
Above grade when adjacent to public walkway
7
7
*HorizontaI distance.
t36 in. to electric meter.
$18 in. above roof surface in Canada.
Horizontal Vent Termination
NOTE: Do not locate the vent termination close to shrubbery.
Flue gas may stunt growth or kill shrubs. Combustion products
may affect unprotected building material surfaces. Sealing or
shielding of exposed surfaces with a corrosion resistant material
may be required in these cases.
NOTE: In U.S.A., vent must terminate 3 ft above any mechanical
fresh air intake within 10 ft.
After vent system is installed, inspect all joints and supports. If all
joints are secure, fully seated, and well supported by straps,
furnace may be started, adjusted per furnace Installation Instruc¬
tions, and placed into operation. See vent pipe manufacture’s
Installation Instructions: cure time may be required before oper¬
ating furnace.
Step 8—START-UP, ADJUSTMENT, AND SAFETY
CHECK
GENERAL
The furnace must have a 115-v power supply properly connected
and grounded. Correct polarity must be maintained to enable
operation.
The gas service pressure must not exceed 0.5 PSIG (14-m. wc), but
be no less than 0.16 PSIG (4.5-in. wc).
Thermostat wire connections at R and WAVl are the minimum
required for gas heating operation. W2 must be connected for
2-stage heating thermostats. COM, Y/Y2, and G are required for
cooling, heat pumps, and some clock thermostats. 'Diese must be
made at the 24-v terminal block on the control. (See Fig. 10.)
This furnace can be installed with either a single-stage heating or
a 2-stage heating thermostat. For single-stage thermostats, connect
thermostat R to WAVl at the furnace control terminal block. (See
Fig. 8.) For single-stage thermostats, the control will determine,
based on length of previous heating cycles, when to operate in low
and high gas heat for optimum comfort. Setup switch-2 (SW-2)
must be in the factory-shipped OFF position. See Fig. 11 and
Tables 9 and 10 for setup switch information.
Table 9—Blower Off Delay Setup Switch Position
DESIRED HEATING
MODE BLOWER OFF
DELAY (SEC)
SETUP SWITCH
SW-3
SW-4
90
OFF
OFF
135
ON
OFF
180
OFF
ON
225
ON
ON
Table 10—Setup Switch (SW) Description
SETUP
SWITCH NO.
NORMAL
POSITION
DESCRIPTION
OF USE
SW-1
High Gas Heat
OFF
Turn switch ON to obtain high gas
heat operation on any call for heat
regardless of whether *R-W/W1, or
R-W/W1, -W2 is closed. SW-1 over¬
rides SW-2.
SW-2
Low Gas Heat
OFF
Turn switch OFF for installations
with single-stage thermostats; con¬
trol selects low gas heat or high gas
heat operation based on previous
cycles. Turn switch ON for installa¬
tions with 2-stage thermostats to
permit only low gas heat operation
in response to closing *R-W/W1.
High gas heat is supplied only when
R to W/W1 and W2 is closed.
SW-3, and
SW4
ON, OFF
Switches control gas heating mode
blower off delay. See Table 9.
K a 2-stage heating thermostat is to be used, move SW2 to the ON
position at the end of the furnace installation. This will override the
built-in control process for selecting high and low fire and allow
the 2-stage thermostat to select heating modes. The W2 from the
thermostat must be connected to W2 on the control terminal block.
(See Fig. 9.)
A CAUTION
This furnace is equipped with a manual reset limit switch in
the gas control area. The switch will open and shut off power
to the gas valve if a flame rollout or overheating condition
occurs in the gas control area. DO NOT bypass the switch.
Correct inadequate combustion-air supply, component fail¬
ure, or restricted flue gas passageway and reset the switch.
Before operating the furnace, check each manual reset switch for
continuity. If necessary, press and release the button to reset the
switch.
SEQUENCE OF OPERATION
Using the schematic diagram in Fig. 12, follow the sequence of
operation through the different modes. Read and follow the
diagram very carefully.
NOTE: If a power interruption occurs during a call for heat
(W/Wl or WAVl and W2) and if the thermostat is still calling for
gas heating, the control will start a 90-sec blower-only ON period
2 sec after power is restored. The LED red light will flash code 12
during the 90-sec period, after which the LED will be ON
continuous, as long as no faults are detected. After the 90-sec
10