27
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
PHR
BPHE
Model
Heat
recovery
capacity
(kW)
Water
storage(L)
Rated hot
water flow
rate(L/s)
Pressure Drop
at Rated Flow
Rate
(kPa)
Connection
(mm)
RTXC110XE B60HX28
44.66
3.12
2.14
26.2
DN50
RTXC160XE B60HX24
51.64
5.36
2.47
12.9
DN50
RTXC180XE B60HX24
72.08
5.36
3.45
23.9
DN50
RTXC200XE B60HX24
70.04
5.36
3.35
23.0
DN50
RTXC220XE B60HX24
89.32
6.24
4.27
26.2
DN50
Partial Heat Recovery Freeze Avoidance
NOTICE - 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.
NOTICE - 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.
NOTICE - 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
o
F, and power off till ambient temperature higher than 49±6
o
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.