Partial Heat Recovery Freeze Avoidance - Trane RTXC-XE Series Installation, Operation And Maintenance Manual

Partial Heat Recovery Freeze Avoidance

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A field-supplied water strainer with a minimum size of 16 mesh must be installed close to the
BPHE inlet to prevent debris into the heat exchanger. Install shutoff valves on both the entering
and leaving water lines so that the BPHE can be isolated for service.
A field installed safety or relief valve on the water side is required for the partial heat recovery to
prevent risks resulting from a failure of the thermostat.
Insulate water lines and other portions of the heat recovery water loop to prevent heat loss and
potential injury due exposure to a hot surface.
Thoroughly flush all the hot water piping before making the final piping connections to BPHE
after external water piping installation and leakage test. Construct a temporary bypass around the
unit for flushing to prevent damage to internal components of the BPHE.
Table 5. PHR BPHE Data
Unit
RTXC 110XE, 110/130/140XE-HSE
RTXC 160XE, 160XE-HSE
RTXC 180XE, 180XE-HSE
RTXC 200XE, 200XE-HSE
RTXC 220XE, 220/250/280XE-HSE
Partial Heat Recovery in Cooling Only!
The heat recovery water pump should be activated only in cooling mode and stopped in
heating mode. Thoroughly drain the water from partial heat recovery water loop in winter.
BPHE Anti-freeze Protection!
Failure to connect circuit breaker 1Q4 after partial heat recovery BPHE filled with water may
result in BPHE freeze failure in winter.
BPHE Heater Damage!
To prevent partial heat recovery BPHE electrical heater burnout, disconnect the circuit breaker
1Q4 of heater after water drainage.
The partial heat recovery BPHE and the water pipe are equipped with anti-freeze electrical heater,
which parallel connected with the evaporator electrical heater and field supplied 230v power by
users. ON/OFF of the electrical heater is controlled by the thermostat according to the ambient
temperature, which powered on when the ambient temperature lower than 39±6°F, and power off
till ambient temperature higher than 49±6°F.
Additional circuit breaker 1Q4 for heat recovery heater is equipped in the control panel which
must be disconnected to avoid electrical heater burnout after BPHE water drainage and powered
on after BPHE filled with water to prevent from freezing damage in winter.
The partial heat recovery water system should be drained from the lowest point of the hot water
piping in winter.
Heat
PHR Water
Recovery
BPHE Storage
Capacity
Model
(kW)
B60HX28 44.66
B60HX24 51.64
B60HX24 72.08
B60HX24 70.04
B60HX24 89.32
NOTICE
NOTICE
NOTICE
Rated Pressure
Hot Drop at
Water Rated
Flow Flow
(L)
rate Rate
(L/s) (kPa)
3.12 2.14 26.2
5.36 2.47 12.9
5.36 3.45 23.9
5.36 3.35 23.0
6.24 4.27 26.2
RTXC-SVX003D-EN
Connection
(mm)
DN50
DN50
DN50
DN50
DN50