Page 25
GT-S
Air Limits
Cooling
Heating
Min. Ambient Air
-10
°
F
-10
°
F
Rated Ambient Air
80
°
F
70
°
F
Max. Ambient Air
100
°
F
85
°
F
Min. Entering Air
50
°
F
40
°
F
Rated Entering Air db/wb
80/67
°
F
70
°
F
Max. Entering Air db/wb
110/83
°
F
80
°
F
Water Limits
Min. Entering Water
30
°
F
20
°
F
Normal Entering Water
50-90
°
F
30-60
°
F
Table 16. Operating Limit
BEFORE POWERING SYSTEM, check the following:
❑
High voltage is correct and matches nameplate
❑
Fuses, breakers, and wire size correct
❑
Low voltage wiring complete
❑
Piping completed and water system cleaned and flushed
❑
Air is purged from closed loop system
❑
Isolation valves are open, water control valves or loop pumps wired
❑
Condensate line open and correctly pitched
❑
Transformer switched to lower voltage tap if needed
❑
HWG pump disconnected unless piping is completed and air has been purged
❑
Blower rotates freely – shipping support has been removed
❑
Blower speed correct
❑
Air filter is clean and in position
❑
Service/access panels are in place
❑
Return air temperature is between 40-80
°
F in heating and 50-110
°
F in cooling
❑
Air coil cleaned
❑
CXM field selectable options such as thermistor settings are correct.
UNIT START UP
Operating Limits
Environment
– This unit is designed for indoor installa-
tion only.
Power Supply
– A voltage variation of +/– 10% of
nameplate utilization voltage is acceptable.
Starting Conditions
GT-S Units
– Units start and operate in an ambient of -
10
°
F with entering air at 40
°
F, entering water at 20
°
F
and both air and water at the stated flow rates of ARI 330
for initial winter start-up.
NOTES
1.
There are not normal or continuous operating
conditions. It is assumed that winter start-up is to
bring the building space up to occupancy tempera-
tures.
2.
Voltage utilization range complies with ARI
Standard 110.
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.
Extreme variations in temperature and humidity and
corrosive water or air will adversely affect unit perfor-
mance, reliability, and service life.
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