Heat Controller HTH, HTV, HTD manual Unit Commissioning And Operating Conditions, Operating Limits

Installation, Operation & Maintenance HTV/HTD/HTH SERIES Heat Controller, Inc.

Unit Commissioning And Operating Conditions

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.

Table 8a: Building Operating Limits

Limits		TTUnitHT
pOperatingLimits	Cooling			Heating
	Cooling
Air mLimits
Min. ambient air, DB	45ºF [7ºC]			39ºF [4ºC]
mbient air, DB	45ºF [7ºC]		39ºF [4ºC]
Rated ambient air, DB	80.6ºF [27ºC]		68ºF [20ºC]
ambient air, DB	80.6ºF [27ºC]		68ºF [20ºC]
Max. ambient air, DB	130ºF [54ºC]		85ºF [29ºC]
mbient air, DB	130ºF [54ºC]		85ºF [29ºC]
Min. entering air, DB/WB	65/45ºF [18/7ºC]		50ºF [10ºC]
tering air, DB/WB	60/45ºF [16/7ºC]		40ºF [4.4ºC]
entering air, DB/WB	70/50ºF Reheat		68ºF [20ºC]
	80.6/66.2ºF [27/19ºC]
Rated entering air, DB/WB	80.6/66.2ºF [27/19ºC]		68ºF [20ºC]
ntering air, DB/WB	100/75ºF [38/24ºC]		80ºF [27ºC]
Max. entering air, DB/WB	100/75ºF [38/24ºC]		80ºF [27ºC]
Limits
Water Limits	30ºF [-1ºC]		20ºF [-6.7ºC]
tering water
Min. entering water	20ºF [-6.7ºC]		20ºF [-6.7ºC]
entering water	50-110ºF [10-43ºC]		30-70ºF [-1 to
Normal entering water	50-110ºF [10-43ºC]		30-70ºF [-1 to 21ºC]
Maxntering. enteringwaterwater	120ºF120ºF[49ºC][49ºC]		120ºF90ºF [32ºC][49ºC]
NormalWaterWaterFlowFlow	1.15.5toto3.30.0gpm/ /ton
	[1[1.6.6toto3.32.2l/ml/mperkW]

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

Commissioning Limits	UnitHT
	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]
Normal Water Flow	1.5 to 3.0 gpm / ton
	[1.6 to 3.2 l/m per kW]

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