Technical data

Page 9
Operating Limits
Environment - This unit is designed for indoor
installation ONLY.
Power Supply - A voltage variation of +/- 10% of
nameplate utilization voltage is acceptable. Three-phase
system imbalance shall not exceed 2%.
Starting Conditions
HS/HL/HP & VS/VL/VP Units - HS/HL/HP& VS/VL/
VP Units start and operate in an ambient of 40°F with
entering air at 40°F, entering water at 70°F and both air
and water at the stated flow rates of ARI Standard 320-
86 rating test for initial winter start-up.
HL/HP & VL/VP Units - HL/HP & VL/VP Units start
and operate in an ambient of 40°F with entering air at
40°F, entering water at 40°F and both air and water at the
stated flow rates of ARI Standard 320-86 rating test for
initial winter start-up.
Notes
1. These are not normal or continuous operating
conditions. It is assumed that winter start-up is to
bring the building space up to occupancy
temperatures.
2. Voltage utilization range complies with ARI
Standard 110.
3. When using 100 percent outside air as a source of
ventilation, a 40°F DB minimum (heating mode) and
a 78°F WB maximum (cooling mode) are
acceptable, but the cabinet may sweat during hot
weather.
4. 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 ensure proper unit
operation (refer to Table 2).
5. Extreme variations in temperature and humidity and
corrosive water or air will adversely affect unit
performance, reliability and service life.
Air Limits
Min. Ambient Air
Rated Ambient Air
Max. Ambient Air
Min. Entering Air
Rated Entering Air db/wb
Max. Entering Air db/wb
Water Limits
Min. Entering Water
Normal Entering Water
Max. Entering Water
50°F50°F40°F40°F
80°F70°F80°F70°F
100°F85°F 100°F85°F
50°F50°F50°F40°F
80/67°F70°F 80/67°F70°F
110/83°F80°F 110/83°F80°F
55°F55°F40°F40°F
85°F70°F85°F70°F
110°F90°F 110°F90°F
Table 2 Operating Limit
START-UP PREPARATION
3. Open all air vents. Fill the system with water. DO
NOT allow system to overflow. Bleed all air from
the system. Check the system for leaks and repair
appropriately.
4. Verify all strainers are in place. Start the pumps, and
systematically check each vent to ensure all air is
bled from the system.
5. Verify make-up water is available. Adjust make-up
water appropriately to replace the air which was bled
from the system. Check and adjust the water/air level
in the expansion tank.
6. Set the boiler to raise the loop temperature to
approximately 85°F. Open a drain at the lowest point
in the system. Adjust the make-up water replacement
rate to equal the rate of bleed.
System Cleaning and Flushing
Cleaning and flushing the unit is the single most
important step to ensure proper start-up and continued
efficient operation of the system.
To prevent injury or death due to electrical shock or
contact with moving parts, open unit disconnect
before servicing unit.
Follow the instructions below to properly clean and flush
the system:
1. Verify electrical power to the unit is disconnected.
2. Install the system with the supply hose connected
directly to the return riser valve. Use a single length
of flexible hose.
Cooling Heating Cooling Heating
HS/VS HL/HP &VL/VP
WARNING