Time Delays; New System Start−Up & Checkout - Lennox Harmony II Zone Control System Installation Instructions Manual

Each time the button is single clicked, the display will
toggle back and forth between the two error codes and re-
fresh the 10 second display timer.
Before leaving the job site, you must erase the stored error
codes so that fresh error codes will be available on your
next visit to the job site. Stored error codes can be erased
by momentarily removing, then restoring power to the con-
trol center.
B−Double Click (Bypass Time Delays)
Quickly pressing and releasing the button twice (double click-
ing) will bypass the current time delay and force the next
scheduled operation to start. During some switch over opera-
tions, time delays are stacked" on top of each other. In other
words, a time delay may be followed by another time delay.
The button may need to be double clicked several arial in or-
der to start the next scheduled operation.
Double clicking can be used to speed along new system
startup and checkout.
C−Single Long Push (Display Status)
Pushing and holding the button down for about 2 seconds
displays the status of the control panel. The display uses the
diagnostic LEDs along with the zone damper LEDs to indi-
cate the current status of the control panel. Control panel sta-
tus will be displayed for one minute. A double click will bypass
this delay and return the LED displays to their normal func-
tion.
Display Code After Single Long Push of DIAG/Bypass Button
Control Panel
LED Display
Mode
Diag 1 Cool
Diag 2 Heat
Diag 3 Auto*
Diag 4 Zone
Zone Damper1 Central*
Zone Damper 2 Off
Zone Damper 3 Fan Auto*
Zone Damper 4 Fan On

Time Delays

Several different delay timers are used in the Harmony II sys-
tem. Delays may precede or follow a demand depending on
the type of function. The delays are used to control equip-
ment connected to the system. Table 4 shows how the most
noticeable delays are used:
Table 3
Note
Only one on at a time Only one on at a time.
*If error occurs, system will re- If error occurs, system will re
t t A t d b d f
vert to Auto mode by default.
Only one on at a time. Only one on at a time.
* f *If error occurs, system will
revert to Central mode by revert to Central mode by
default.
Only one on at a time.
*If error occurs system will re *If error occurs, system will re-
vert to Auto mode by default.
Delay
Blower Off Delay
(gas heat only)
Compressor
Speed Change
Compressor Off
Heat Staging
(electric heat only)
Auto-changeover
New System Start−Up & Checkout
A−Powering the System (All Systems)
1− Place all thermostats in a position where no demand
will occur.
2− Apply power to the furnace and to the zone damper
transformer. This will cause all four diagnostic LEDs
and system control panel service LED to be lit for 2
seconds then go off.
NOTE − In normal operation, the DIAG 2 LED will always
briefly flash on then off when an external switch is opened
or closed. For example, when there is a call for cooling in
zone 1, the 1Y thermostat LED will light and the DIAG2
lt
LED will flash on then off. When the cooling demand has
been satisfied, the 1Y LED will go off and the DIAG 2 LED
will again flash on then off.
B−Heating (Gas Heat Systems)
Gas Single Zone Heating
1− Press the heat switch, zone switch, and the fan auto
switch on the system control panel. See figure 28.
The amber LEDs on the heating switch and fan
D
auto switch of the system control panel will be lit.
2− Initiate a heating demand from zone 1.
Input LED 1W on. (Heating demand)
D
LED 1DZ off. (zone 1 damper open)
D
LEDs 2DZ, 3DZ and 4DZ on. (dampers closed)
D
Output LED W1 on. (Furnace on)
D
3− The furnace will begin its ignition sequence after Zone
1 has demanded heat.
Page 30
Table 4
Time Delays
Time Function
Gas Furnace only. Dumps air into
5-1/2
last zone called during cool down fol-
min.
lowing heat demand.
Between low speed and high speed in
order to make sure high speed de-
mand is valid and to equalize refriger-
4+1
ant pressures. 1 minute due to TSC in
min.
outdoor unit. 4 minutes due to delay in
Harmony control center. Compressor
can cycle off anytime.
At end of demand. Equalizes
5
pressure in refrigerant system and
min.
prevents short cycling.
2
Between stages up or down.
min.
When opposing demands are present,
zone control system must work to sat-
isfy current demand at least 20 min. If
20 current demand is not satisfied
min.
after time has elapsed, system will
changeover and satisfy opposing de-
mand. On and Off delays above will
also apply.