Familiarize yourself with its correct operation to ensure
maximum comfort with minimum energy consumption.
The computerized electronic thermostat is an electronic
version of a manual changeover type of thermostat.
This thermostat includes features that allow set-back
temperature variations for nighttime or periods when
you are away from home during the day, reducing energy
costs. The thermostat also features a digital clock.
Cooling only
If your air conditioning system is designed to provide
cooling only (AC), with no capability for heating operation
(heat pump), a two-stage cooling only thermostat with a
manual, one-position Cool and Off comfort switch is all
that is required for system operation.
Cooling and heating (heat pump)
If your system is designed to allow both cooling and
heating operation, you may have either a manual
changeover type of thermostat or a programmable
electronic type of thermostat with two stages of cooling
and two stages of heat.
Manual changeover
Manual changeover means that the comfort switch must
be manually positioned every time you want to switch
from the cooling to heating mode of operation or heating
to cooling mode of operation.
Start-up
Observe the maximum and minimum conditions for
operation to ensure your system delivers optimum
performance and requires minimum service.
Table 1: Minimum and maximum operating limit
conditions
Outdoor coil °F
(°C)
Indoor coil °F (°C)Air
temperature
DB cool DB heat WB cool DB heat
Minimum 35 (2) -5 (-21) 57 (14) 50 (10)
Maximum 122 (50) 75 (24) 72 (22) 80 (27)
Note: Refer to the NOTICE in the Reduced capacity
conditions section in the Installation Manual.
Note: Operation below listed temperatures is
permissible for a short period of time during
morning warm-up.
If the main power supply to the outdoor and indoor units
is off, place the system into operation as follows:
1. Enable the mode of operation.
2. Set the thermostat to the required temperature.
- Cooling: For cooling, the higher the setting,
the lower the amount of energy consumed.
Federal guidelines recommend a setting of
78°F (26°C).
- Heating: For heating, the lower the setting,
the lower the amount of energy consumed.
Federal guidelines recommend a setting of
65°F (18°C) or lower.
Note: If your cooling and heating temperature
adjustments are separate, ensure to set both.
3. Set the mode of fan operation required.
Power failure
If a power failure occurs, the system automatically
resumes operation when power is restored, using the set-
points that were present when power was interrupted.
When accidents, wind, storms, or other issues disrupt
electrical power supply to your home, set the thermostat
to the Off position.
Electronic thermostat
This computerized electronic thermostat, when
programmed, functions automatically to operate the
system as follows:
• When the indoor temperature rises above the higher
(cool) setting, the outdoor unit operates and the
indoor fan circulates the cooled, filtered air. When the
room temperature is lowered to the selected level,
the system shuts off. The indoor fan either shuts off
or runs continuously, depending on the selected fan
switch setting.
• When the indoor temperature drops below the lower
(heat) setting, the heating system operates and the
indoor fan circulates the heated, filtered air. When
the indoor temperature rises to the selected setting,
the system shuts off. The indoor fan either shuts off
or runs continuously, depending on the selected fan
switch setting.
Operating efficiency
Heating conservation
For the most efficient operation, keep storm windows and
doors closed all year long. They help insulate against heat
and cold, and they also keep out dirt, pollen, and noise.
To conserve already heated air, do the following:
• Close drapes at night.
• Keep fireplace dampers closed when not in use.
• Run exhaust fans only when necessary.
Keep lamps, televisions, or other heat producing sources
away from the thermostat. The thermostat senses
this extra heat and is not able to maintain the inside
temperature to the chosen comfort level.
Cooling conservation
The following are some useful points to note:
• To comfortably cool your home, your air conditioner
must remove both heat and humidity. Do not turn your
system off, even if you are away all day. It is normal for
this unit to run continuously as it maintains the comfort
level.
• Keep windows closed after sundown. While the outdoor
temperature at night may be lower than indoors, the
air is generally loaded with moisture that is soaked up
by furniture, carpets, and fabrics. This moisture must
be removed when you restart your system.
User's Information Manual: HMH7 Series - 17 SEER2 Horizontal Discharge Modulating Heat Pump2
Johnson Controls Ducted Systems
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