Trane Axiom GEHB Installation Operation & Maintenance page 12

Concealed installation for
horizontal unit
Following procedures hereafter for
horizontal unit installation. Figure 9
shows unit rigging.
1.Furnish attenuation pad around
the four rigging bracket at unit return
section.
2.Safely suspend the unit with bolt
3/8" in size from building supporting
framework like joist cement backbone
and any other capable constructs.
Each rigging bracket must be fixed with
field supplied bolt and lock gasket.
3.It's the contractor responsibility to
determine on unit pitch in accordance
with local codes. A pitch toward the
drain discharge must be 2% in slope
from at least two dimensions.
Warning A capable support must
be used for unit to suspend from, or
serious body hurt/death of personnel
or damage to unit will occur.
RETURN-AIR
FILTER
RETURN-AIR
AIR VENT
H
1/4"
12"
L
J
Figure 10 Design sample of system with trap for negative pressure
WATER-OUT
WATER-IN
AUTOMATIC B A LANCING
HOSE K I T
Figure 11 Supply/Return hose connection diagram
Installation and checklist
Condensate drain
Hose with female thread size of 1/2"
is used for drain discharge. Install
water trap at proper location of unit
pipeline. What is important and must
be taken into account for trap design of
water source heat pump system is the
influence of minus pressure. For unit in
normal operation with a well-designed
trap, water column in the trap will rise
until a stable discharge is formed.
There must always be water in the trap
especially in seasons when hot supply
is required. Regular clean the trapped
pipeline to ensure fluent discharge.
Negative pressure system with water
trap is typically shown in Figure 10.
Caution
have a pitch of three to five degrees
towards the discharge direction for the
convenience of water drainage.
NEGATIVE PRESSURE TRAPPING
H= 1"(25.4mm) FOR EVERY 1"(25.4MM)
OF MAXIMUM NEGATIVE STATIC
PRESSURE +1"(25.4mm).
J= HALF OF H
L= H+J+PIPE DIAMETER+INSULATION.
BLOWER/MOTOR
SUPPLY-AIR
ACCESS PANEL
CLEAN-OUT
(CAPPED)
RETURN TO
LOOP
SUPPLY FROM
CENTRAL PUMP
Caution Drain hose must
3/8" ALL-THREAD
(BY OTHERS)
3/8" WASHER/NUT
(BY OTHERS)
Figure 9 Ceiling mounting diagram for horizontal unit
10
S u p p l y / r e t u r n h o s e
connection
S u p p l y / r e t u r n f l e x i b l e h o s e i s
connected to the water in/out of the
unit. In lieu of rigid connection, steel
braided flexible hose is recommended
for use in the main water circuit to
isolate vibration. A water circuit is
connected with self balance flexible
hose in Figure 11. For a typical open
circuit, water filter is used to shut the
access of foreign materials to coaxial
heat exchanger.
Clean and flush of water
circuit
A thorough clean and flush schedule
m u s t b e p e r f o r m e d t o t h e w a t e r
circuit before connecting to the unit.
Or pollutants will enter the system
resulting in prompt block, ice formation
a n d u n i t m a l f u n c t i o n . T h e s a m e
clean process must be done to field
connecting tubes as well.
RETURN-AIR
SUP