Thermidistat Mode - Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual

Notes For Figure 50°56
1. Heat pump M_ST have a high pressm'e switch l\_r dual f_lel applications.
2. Refer to outdoor equipment Installation Instructions _br additional in*bm_ation and setup procedure.
3. Select the "ZONE" position on the two=speed heat pump control.
4. Outdoor Air Temperature Sensor must be attached in all dual fuel applications
5. Dip switch No 1 on Thermidistat should be set in OFF position _br air conditioner installations This is _ctory dePault.
6. Dip switch No 1 on Thermidistat should be set in ON position for heat pump installations.
7. Dip switch No 2 on Thenr_idistat should be set in OFF position t:br single-speed compressor operation. This is _cto W default
8. Dip switch No 2 on Thermidistat should be set in ON position for two-speed compressor operation.
9. (or*figuration Option No 10 "Dual Fuel Selection" must be mined ON in all daal _hel applications.
10. NO connection should be made to the furnace HI_M terminal when using a Thermidistat
11. The RVS Sensing terminal "L" should not be connected This is internally used m sense def_'ost operation
12. DO NOT SELECT the "FUPC\'A( E INTERFACE" or "BALAN(E POINT" option on the two=speed heat pump control board. This is
controlled internally by the ThermidistatiDual Fuel Them_ostat.
13. Dip switch D on Dual Fuel Thermostat shoutd be set in OFF position tbr single-speed compressor operation This is i:actoW default.
14. Dip switch D on Dual Fuel Thermostat shoutd be set in ON position for two-speed compressor operation.
d. Flame-Proving- When the burner flame is proved at the
flame-proving sensor electrode FSE, fl-_efhmace control
CPU begins the blower=ON delay period and continues to
hold the gas valve GV open. If the burner flame is not
proved within two seconds, the control CPU will ctose the
gas valve GV, and the control CPU will repeat the ignition
sequence _br up to three more Trials=For-Ignition before
going to Ignition=Lockout. Lockout will be reset auto-
matically af'te, three hou*s, or by momentarily interrupting
115 vac power to tl_e _k/rnace, or by interrupting 24 vac
powe* at SEC 1 or SEC2 to the fro'hate control CPU (not at
W, G, R, etc.).
If flame is proved when flame should not be present, the
furnace control CP[ will lock out of Gas-Heating mode
and operate the in&cer motor IDM until flame is no tonger
proved.
e. Blower-On Delay- If the burner flame is proven, the
blower motor is energized on HEAT speed 66 seconds (040
through 120 sizes) or 45 seconds (140 size) aker the gas
valve GV is energized.
Simultaneously, the electronic air cleaner tem_inai EAC-1
is energized and remains energized as long as the blower
motor BLWM is energized.
E Blower-Off Delay- When the the*mostat is satisfied, the
R=to-W circuit is opened, de=energizing the gas valve GV,
stopping gas 13ow to the burners, and de-energizing the
humidifier terminal HUM The inducer motor IDM will
remain energized for a 15=second (040 through 120 sizes)
or 5=second (I40 size) post=purge pe*iod. The blower motor
BLWM and air cleaner terminal EAC-I will remain ener-
gized fbr 90, 120, 150, or 180 seconds (depending on the
blower-OFF delay selection). The finlaace colmol CP[ is
factow-set for a 120-second blower-OFF delay.
( OOLING MODE
The them_ostat "calls for cooling."
a, Single-Speed Cooling
(See Fig. 27, 50, 52, and 54 for thermostat connections)
The d'*ermostat closes the R to G-and=Y circuits. The R to
Y circuit starts the outdoor unit, and the R to G-and-Y/Y2
circuits start the furnace blower motor BLWM on (OOL
speed.
The etect*onic air cleaner tem_inal EAC= 1 is energized with
115 vac when the blower motor BLWM is operating.
When the thermostat is satisfied, the R to G=and-Y circuits
are opened. The outdoor unit will stop, and the furnace
blower motor BLWM wi!l continue operating on the
COOL speed fbr an additional 90 seconds. Jumper Y/Y2 to
DHUM to reduce the cooling off-delay to 5 seconds (See
Fig. 3!)
b, Two-Speed (ooling
(See Fig. 27, 51, 53, 55, and 56 for thermostat connec-
tions.)
The thermostat closes the R to G-and-Y1 circuits fbr
low-cooling or closes the R to G-and-Yl-and-Y2 circuits
_br high-cooling The R to YI circuit starts the outdoor unit
on low-cooling speed, and the R to G-and-Y1 el*cult starts
the furnace blower motor BLWM on low-coot speed (same
speed as FAN) The R to Yl-and-Y2 circuits start the
outdoor unit on high-cooling speed, and the R to G-and-
Y/Y2 circuits start the fi/rnace blower motor BLWM on
COOL speed.
The electronic air cleaner terminal EAC-1 is energized
with 115 vac whenever the blower motor BLWM is
operating.
When the thermostat is satisfied, the R to G and-Y1 or R to
G and-Y1 and-Y2 circuits a*e opened. The outdoor unit
stops, and the furnace blower BLWM and electronic air
cleaner te*minal EAC-1 will remain energized for an
additional 90 seconds. Jumper Y1 to DHUM to reduce the
cooling off'delay to 5 seconds (See Fig. 3i)
THERMIDISTAT MODE
(See Fig. 50, 51, 52, and 53 fbr Them_idistat connections.)
The dehumidification output, DHI_M on the Them_idistat
should be connected to the furnace control thermostat terminal
DHUM. When there is a dehumidify demand, the DHI_M
input is activated, which means 24 vac signal is removed ['rom
the DHUM input terminal. In other words, the DHUM input
logic is reversed. The DHUM input is turned ON when no
dehumidif) demand exists. When 24 vac is initially detected
by the fine, ace control on the DHUM input, the flmaace control
operates in Themaidistat mode. If the DHUM input is tow or
OFF for more than 48 hours, the [:umace control reverts back
to non=Thermidistat mode.
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