Mammoth 1/2 to 6 Tons: High Efficiency Single Circuit Horizontal and Vertical (A-Vintage) - Manual (Page 10)

10
MAMM-WSHP-IOM-1MA
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. A-Vintage horizontal and vertical units have time
delays which help protect the compressor(s)
against short cycling. In the cooling mode, after 30
seconds of operation, check the discharge grilles
for cool air delivery. Measure the temperature dif-
ference 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 M-
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 A-Vintage horizontal and
vertical units compatible?
b) If the A-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.