Johnson Controls HMH72B36 User Manual

Limitations
Install the unit in accordance with all national, state, and
local safety codes, and the following limitations:
• Observe the limitations for the indoor unit, coil, and
appropriate accessories.
• Do not install the outdoor unit with any duct work in
the air stream. The outdoor fan is the propeller type
and is not designed to operate against any additional
external static pressure.
• Observe the maximum and minimum conditions for
operation to ensure a system that gives maximum
performance with 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: See the NOTICE in the Reduced capacity
conditions section.
Reduced capacity conditions
NOTICE
Inverter temperature protection
If excessive inverter temperatures are sensed, the
compressor speed/capacity is reduced until an
acceptable condition is reached. When the inverter
temperature returns to an acceptable level, the system
returns to normal operation.
NOTICE
Overcurrent and undercurrent protection
If a low or high current condition is sensed, the
compressor speed/capacity is reduced until an
acceptable current level is reached. When the system
reaches an acceptable current level, the compressor
and fan return to normal operating conditions.
NOTICE
Overvoltage and undervoltage protection
If a low or high supply voltage condition is sensed
(below 187 VAC or above 265 VAC), the compressor
speed/capacity is automatically reduced until an
acceptable voltage level is reached. When an
acceptable voltage level is sensed, the system
automatically returns to a normal state of operation.
NOTICE
Low ambient protection
Cooling mode: The unit automatically adjusts to
maintain cooling operation in outdoor ambient
conditions down to 35°F (2°C). The unit reduces
capacity and low ambient protection (cooling mode) or
cycles off if asked to provide cooling when the outdoor
temperature is at or below these conditions. Heating
mode: The unit provides compressor heat down to an
outdoor ambient temperature of -5°F (-29°C). As the
outdoor ambient temperature reduces, available heat
reduces for all air source heat pumps.
Piping considerations
When using more than 15 ft of interconnecting tubing,
see Table 2 for charging. For long-line applications,
interconnecting lines over 100 ft must be installed with
liquid line solenoid. Refer to the Piping Application Guide
for more information.
Figure 1: Refrigerant piping
Table 2: Refrigerant piping
Maximum
pipe length
(L)
Maximum
height
difference
(H)
Additional
refrigerant
- exceeding
15 ft (4.6 m)
Model
ft (m) ft (m) oz/ft (g/m)
HMH72B24 164 (50) 98 (30) 0.38 (11)
HMH72B36 246 (75) 98 (30) 0.38 (11)
HMH72B48,
HMH72B60
246 (75) 98 (30) 0.60 (17)
Installation Manual: HMH7 Series - 17 SEER Horizontal Discharge Modulating Heat Pump6
Johnson Controls Ducted Systems

Johnson Controls HMH72B36 Specifications

General

Brand	Johnson Controls
Model	HMH72B36
Category	Heat Pump
Language	English