Mammoth 3/4 to 5 Tons: Single Circuit Horizontal and Vertical (U-Vintage) - Manual (Page 10)

10
MAMM-WSHP-IOM-1UB (September 2011)
1. Open all valves to full open position and turn on
power to the heat pump.
2. Set room temperature sensor for “Fan Only” opera-
tion by selecting “Off” at the system switch and
“On” at the fan switch. If “Auto” fan operation is se-
lected, the fan will cycle with the compressor.
Check for proper air delivery.
3. U-Vintage horizontal and vertical units have time
delays which help protect the compressor(s)
against short cycling. In the cooling mode, after a
few minutes of operation, check the discharge
grilles for cool air delivery. Measure the tempera-
ture difference between entering and leaving water.
It should be approximately 1 ½ times greater than
the heating mode temperature difference.
4. In the heating mode, measure the temperature dif-
ference between entering and leaving air and en-
tering and leaving water. With entering water of 60°
F to 80°F, leaving water should be 6°F to 12°F
cooler, and the air temperature rise through the U-
Vintage horizontal and vertical units should not ex-
ceed 35°F. If the leaving air temperature falls be-
low 35°F, adjust water flow to the unit to >3 gpm/
ton to avoid freeze damage to the unit.
Start-up
5. Fill the p-trap with water to ensure that negative
pressure does not pull drain gases into the unit.
6. Check the elevation and cleanliness of the conden-
sate line. If the air is too dry for sufficient dehumidi-
fication, slowly pour enough water into the conden-
sate pan to ensure proper drainage.
7. If the unit does not operate, check the following
points:
a) Is supply voltage to the U-Vintage horizontal and
vertical units compatible?
b) If the U-Vintage horizontal and vertical units op-
erates but stops after a brief period:
i) Is there proper airflow? Check for dirty filter,
incorrect fan rotation or incorrect ductwork.
ii) Is there proper water flow rate within tem-
perature limits? Check water balancing; back-
flush unit if dirt clogged.
iii) See troubleshooting guide on page 21 for
more tips.