Heat Pump And Tank Assembly - Rheem HPHD-135HNU-483 Owner's Manual And Installation Instructions

HEAT PUMP AND TANK ASSEMBLY

HEAT PUMP AND STORAGE
TANKS
The heat pump water heater system is modular and
comprises three main components: the heat pump water
heater, storage tanks and primary circulator. An auxiliary
booster and/or circulator may also be employed as part of
the system. The water heater must not be operated until
all components are assembled.
HEAT PUMP
Locate the heat pump(s) in the appropriate position ob-
serving the required clearances for operation and servic-
ing. Refer to previous page.
Indoor Installations
To comply with UL 1995, the minimum room size permis-
sible in relation to the quantity of refrigerant in the water
heater, is 264.9 ft 3 per HPHD-60, 60k Btuh heat pump
and 626.1 ft 3 per HPHD-135, 135k Btuh heat pump. A
larger room size is recommended for efficient heat pump
operation.
Ducted models with duct kit are designed to be connect-
ed to ducting to convey cold discharge air away from the
heat pump air inlet. Non ducted models may be installed
indoors, without ducting, if a sufficient supply of heat en-
ergy is available and the room meets the volume require-
ments stated above. Good performance is obtained when
the heat pump is supplied with a constant supply of fresh
air. Failure to observe the above recommendations may
lead to lower than expected performance or problematic
operation of the heat pump.
Ventilation
The heat pump draws fresh air at a rate of 56.5 ft 3 /s for
HPHD-60, 60k Btuh heat pump and 204.8 ft 3 /s for HPHD-
135, 135k Btuh heat pump. Minimum recommended free
air inlet ventilation opening is 10.8 ft 2 per HPHD-60, 60k
Btuh heat pump and 20.8 ft 2 per HPHD-135, 135k Btuh
heat pump.
25
Commercial Air to Water Heat Pump Water Heater
Ducted Models with Kit
The exhaust air duct must be constructed so that it covers
both fans. A spigot is provided on ducted models to facili-
tate ductwork connection. The maximum static pressure
in the ductwork must not exceed the values stated in the
table below.
MAXIMUM STATIC PRESSURE
60k BTU Heat Pump
Ducted Non ducted
11.6 psi
Horizontal Ducting
If ducting horizontally, the vertical dimension of the duct
must be at least 31.5 in high. It is recommended to termi-
nate the ducting with bird mesh as this provides the least
pressure resistance to the fans against air flow. If louvres
are to be used, the duct size must be increased. The duct
should have a slight fall away from the heat pump and
the terminal face be tapered downwards to prevent water
ingress.
Vertical Ducting
If ducting vertically, the duct must terminate 19.68 in
above the roof level and have a free ventilation outlet area
equivalent to 10.76 ft 2 per heat pump 60k BTU models
and 20.77ft 2 per 135k BTU heat pump models. It is rec-
ommended to terminate the duct with bird mesh as this
provides the least pressure resistance to the fans against
air flow. Adequate weather protection must be provided to
prevent water ingress.
Horizontal Fan Option
If a horizontal discharge fan option has been selected,
the same rules apply to location of installation. If installed
indoors, observe the same requirements as shown in in-
door installations on page 14.
135k BTU Heat Pump
Ducted
2.9 psi 14.5 psi
Non ducted
2.9 psi