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Installation, Operation & Maintenance HTV/HTD/HTH SERIES Heat Controller, Inc.
Unit Commissioning And Operating Conditions
Table 8a: Building Operating Limits
Operating Limits
Environment – Units are designed for indoor installation only. Never install units in areas subject to freezing or where humidity levels could
cause cabinet condensation (such as unconditioned spaces subject to 100% outside air).
Power Supply – A voltage variation of +/– 10% of nameplate utilization voltage is acceptable.
Determination of operating limits is dependent primarily upon three factors: 1) return air temperature. 2) water temperature, and 3)
ambient temperature. When any one of these factors is at minimum or maximum levels, the other two factors should be at normal levels
to insure proper unit operation. Extreme variations in temperature and humidity and/or corrosive water or air will adversely affect unit
performance, reliability, and service life. Consult Table 8a for operating limits.
Commissioning Conditions
Consult Table 8b for the particular model. Starting conditions vary depending upon model and are based upon the following notes:
Notes:
1. Conditions in Table 8b are not normal or continuous operating conditions. Minimum/maximum limits are start-up conditions to bring
the building space up to occupancy temperatures. Units are not designed to operate under these conditions on a regular basis.
2. Voltage utilization range complies with AHRI Standard 110.
Table 8b: Building Commissioning Limits
Cooling Heating
m
its
m
bient air, DB 45ºF [7ºC] 39ºF [4ºC]
a
mbient air, DB 80.6ºF [27ºC] 68ºF [20ºC]
m
bient air, DB 1
30ºF [54ºC] 85ºF [29ºC]
t
ering air, DB/WB 60/45ºF [16/7ºC] 40ºF [4.4ºC]
e
ntering air, DB/WB 80.6/66.2ºF [27/19ºC] 68ºF [20ºC]
n
tering air, DB/WB 100/75ºF [38/24ºC] 80ºF [27ºC]
L
imits
t
ering water 30ºF [-1ºC] 20ºF [-6.7ºC]
entering water 50-110ºF [10-43ºC] 30-70ºF [-1 to 21ºC]
n
tering water 120ºF [49ºC] 90ºF [32ºC]
TT
p
erating Limits
l
Water Flow
1.5 to 3.0 gpm / ton
[1.6 to 3.2 l/m per kW]
Cooling Heating
Air Limits
Min. ambient air, DB 45ºF [7ºC] 39ºF [4ºC]
Rated ambient air, DB 80.6ºF [27ºC] 68ºF [20ºC]
Max. ambient air, DB 130ºF [54ºC] 85ºF [29ºC]
Min. entering air, DB/WB 65/45ºF [18/7ºC] 50ºF [10ºC]
Rated entering air, DB/WB 80.6/66.2ºF [27/19ºC] 68ºF [20ºC]
Max. entering air, DB/WB 100/75ºF [38/24ºC] 80ºF [27ºC]
Water Limits
Min. entering water 20ºF [-6.7ºC] 20ºF [-6.7ºC]
Normal entering water 50-110ºF [10-43ºC] 30-70ºF [-1 to 21ºC]
Max. entering water 120ºF [49ºC] 120ºF [49ºC]
Unit
Operating Limits
Normal Water Flow
1.5 to 3.0 gpm / ton
[1.6 to 3.2 l/m per kW]
70/50ºF Reheat
HT
Cooling Heating
Air Limits
Min. ambient air, DB 45ºF [7ºC] 39ºF [4ºC]
Rated ambient air, DB 80.6ºF [27ºC] 68ºF [20ºC]
Max. ambient air, DB 130ºF [54ºC] 85ºF [29ºC]
Min. entering air, DB/WB 60ºF [16ºC] 40ºF [4.5ºC]
Rated entering air, DB/WB 80.6/66.2ºF [27/19ºC] 68ºF [20ºC]
Max. entering air, DB/WB 110/83ºF [43/28ºC] 80ºF [27ºC]
Water Limits
Min. entering water 20ºF [-6.7ºC] 20ºF [-6.7ºC]
Normal entering water 50-110ºF [10-43ºC] 30-70ºF [-1 to 21ºC]
Max. entering water 120ºF [49ºC] 120ºF [49ºC]
Unit
Commissioning Limits
Normal Water Flow
1.5 to 3.0 gpm / ton
[1.6 to 3.2 l/m per kW]
HT