Mammoth 1/2 to 6 Tons: High Efficiency Single Circuit Horizontal and Vertical (A-Vintage) - Manual (Page 9)

9
MAMM-WSHP-IOM-1MA
1. If the A-Vintage horizontal and vertical units are
equipped with water shutoff valves, either electric
or pressure operated, the supply and return run-
outs must be connected at each heat pump loca-
tion. This will prevent the introduction of dirt into the
heat pump.
2. Fill the system at the city water makeup connection
with all air vents open. After filling, close all air
vents.
3. The contractor should start the main circulator with
the pressure reducing valve open. Check vents in
sequence to bleed off any trapped air, providing
circulation through all components of the system.
4. While circulating water, the contractor should check
and repair any leaks in the piping. Drains at the
lowest point(s) in the system should be opened for
the initial flush and blow down, making sure city
water fill valves are set to make up water at the
same rate. Check the pressure gauge at the pump
suction and manually adjust the makeup to hold the
same positive steady pressure both before and
after opening the drain valves. Flush should con-
tinue for at least two hours, or longer if required,
until the drain water is clear and clean.
Cleaning and Flushing
5. Shut off supplemental heater (if applicable) and
circulator pump and open all drains and vents to
completely drain down the system. Short circuited
supply and return runouts should now be con-
nected to the heat pump supply and return connec-
tions. Do not use sealers at the swivel flare con-
nections of the hoses.
6. Refill the system with clean water. Test the water
using litmus paper for acidity and treat as required
to leave the water slightly alkaline (pH 7.5 to 8.5).
The specified percentage of antifreeze may also be
added at this time. Use commercial grade anti-
freeze designed for HVAC systems only. Do not
use automotive grade antifreeze.
7. Once the system has been filled with clean water
and antifreeze (if used), precaution should be taken
to protect the system from dirty water conditions.
Dirty water will result in system wide performance
degradation and solids may clog valves, strainers,
flow regulators, etc. Additionally, the heat exchang-
ers may become clogged which reduces compres-
sor service life or causes premature failure.
8. Set the loop water controller heat add setpoint to
70°F and the heat rejection setpoint to 85°F. Sup-
ply power to all motors and start the circulation
pumps. After full flow has been established through
all components including the heat exchanger
(regardless of season) and air has been vented
and loop temperatures have been stabilized, each
of the heat pumps will be ready for check, test and
start-up, and water balancing.
IMPORTANT:
Prior to first operation of A-vintage units, the water cir-
culation system must be cleaned and flushed of all
construction dirt and debris. After the cleaning
and flushing has taken place, the initial connection
should have all valves wide open in preparation for
the water system flushing.